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<!--
UID=163408
ConceptID=C0850703
-->
<!--imgCountBooks = 0--><h1 class="medgenTitle"><div class="MedGenTitleText">Frequent falls</div></h1><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>163408</dd><dt><span class="dotprefix"></span>Concept ID: </dt><dd><a href="/medgen/docs/help/#sources" target="_blank" title="Concept Unique Identifier from NLM's Unified Medical Language system (UMLS)&#10;Click for more information.">C0850703</a></dd><dt><span class="dotprefix"></span></dt><dd>Finding</dd></dl></div></div><table class="medgenTable"><tbody><tr><td>Synonym:</td>
<td>Frequent falling</td></tr>
<tr><td colspan="2" class="small"> </td></tr><tr><td>HPO:</td>
<td><a target="_blank" title="Human Phenotype Ontology" href="https://hpo.jax.org/app/browse/term/HP:0002359">HP:0002359</a></td></tr>
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<div class="portlet_head mgSectionHead ui-widget-header"><h1 class="nl" id="Term_Hierarchy">Term Hierarchy</h1><a sid="118" href="#" class="portlet_shutter" title="Show/hide content"></a></div>
<div class="portlet_content ln HierarchyGTR"><div class="jig-ncbitabs"><ul><li><a href="#tabGTR">GTR</a></li><li><a href="#tabMGEN">MeSH</a></li></ul><div id="tabGTR"><div class="search_result"><div class="rprts"><div class="chiclet_legend"><span class="chiclet_list" style="position:static;"><span title="Clinical test" class="chiclet Ccolor round">C</span><span>Clinical test,  </span><span title="Research test" class="chiclet Rcolor round">R</span><span>Research test,  </span><span title="OMIM" class="chiclet Ocolor ">O</span><span>OMIM,  </span><span title="GeneReview" class="chiclet Gcolor">G</span><span><em>GeneReviews</em>,  </span><span title="ClinVar" class="chiclet Vcolor">V</span><span>ClinVar  </span></span></div><div id="hierarchy" class="margin_t1"><div class="ds_tree"><ul><li class="matched_ds"><span class="chiclet_list"><span class="chiclet Ccolor round" title="Clinical test"><a target="_blank" href="/gtr/tests/?term=C0850703[DISCUI]&amp;test_type=Clinical" ref="ncbi_uid=163408">C</a></span><span class="chiclet unavailable round" title="Research Tests">R</span><span class="chiclet unavailable" title="OMIM">O</span><span class="chiclet unavailable" title="GeneReviews">G</span><span class="chiclet Vcolor" title="ClinVar"><a target="_blank" href="/clinvar?LinkName=medgen_clinvar&amp;from_uid=163408" ref="ncbi_uid=163408">V</a></span></span><span class="TLline">Frequent falls</span></li></ul></div></div></div></div></div><div id="tabMGEN"><div class="ds_tree"><ul><li><span class="TLline"><a href="/medgen/867443" ref="tree=MeSH" title="MedGen record for Phenotypic abnormality">Phenotypic abnormality</a></span><ul><li><span class="TLline"><a href="/medgen/1763488" ref="tree=MeSH" title="MedGen record for Abnormality of the musculoskeletal system">Abnormality of the musculoskeletal system</a></span><ul><li><span class="TLline"><a href="/medgen/867380" ref="tree=MeSH" title="MedGen record for Abnormality of the musculature">Abnormality of the musculature</a></span><ul><li><span class="TLline"><a href="/medgen/868777" ref="tree=MeSH" title="MedGen record for Abnormal muscle physiology">Abnormal muscle physiology</a></span><ul><li><span class="TLline"><a href="/medgen/870898" ref="tree=MeSH" title="MedGen record for Functional motor deficit">Functional motor deficit</a></span><ul><li><span class="matched_ds">Frequent falls</span></li></ul></li></ul></li></ul></li></ul></li></ul></li></ul></div></div></div></div>
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<div class="portlet mgSection" id="ID_112">
<div class="portlet_head mgSectionHead ui-widget-header"><h1 class="nl" id="Conditions_with_this_feature">Conditions with this feature</h1><a sid="112" href="#" class="portlet_shutter" title="Show/hide content"></a></div>
<div class="portlet_content ln clinfeat">
<div class="divPopper rprt" id="rdis_39017"><div><strong>Stiff-man syndrome</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>39017</dd><dt><span class="dotprefix"></span>Concept ID: </dt><dd><a href="/medgen/docs/help/#sources" target="_blank" title="Concept Unique Identifier from NLM's Unified Medical Language system (UMLS)&#10;Click for more information.">C0085292</a></dd><dt><span class="dotprefix"></span></dt><dd>Disease or Syndrome</dd></dl></div></div></div>
<div class="spaceAbove">The stiff-person syndrome (SPS) is most often an adult-onset sporadic acquired disorder characterized by progressive muscle stiffness with superimposed painful muscle spasms accompanied by electromyographic evidence of continuous motor activity at rest. SPS has been associated with autoimmune disorders, diabetes mellitus, thyrotoxicosis, and hypopituitarism with adrenal insufficiency (George et al., 1984).&#13; Approximately 60% of patients with SPS have antibodies to glutamic acid decarboxylase (GAD2, or GAD65; 138275), the rate-limiting enzyme in the synthesis of the inhibitory neurotransmitter gamma-aminobutyric acid (GABA), suggesting an immune-mediated pathogenesis (Folli et al., 1993). Approximately 10% of patients develop SPS as a paraneoplastic neurologic disorder associated with antibodies to amphiphysin (AMPH; 600418), an intracellular protein associated with neuronal synaptic vesicle endocytosis (Burns, 2005).&#13; See also congenital stiff-man syndrome, or hereditary hyperexplexia (149400), which is caused by mutations in subunits of the glycine receptor gene (GLRA1, 138491; GLRB, 138492).&#13; Meinck and Thompson (2002) provided a detailed review of stiff-person syndrome. They also discussed 2 possibly related conditions, progressive encephalomyelitis with rigidity (PERM), a more severe disorder with other neurologic features, and stiff-limb or stiff-leg syndrome, a focal disorder.</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/39017">Condition Record</a></div></div>
<div class="divPopper rprt" id="rdis_66358"><div><strong>Abortive cerebellar ataxia</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>66358</dd><dt><span class="dotprefix"></span>Concept ID: </dt><dd><a href="/medgen/docs/help/#sources" target="_blank" title="Concept Unique Identifier from NLM's Unified Medical Language system (UMLS)&#10;Click for more information.">C0221061</a></dd><dt><span class="dotprefix"></span></dt><dd>Disease or Syndrome</dd></dl></div></div></div>
<div class="spaceAbove">'Behr syndrome' is a clinical term that refers to the constellation of early-onset optic atrophy accompanied by neurologic features, including ataxia, pyramidal signs, spasticity, and mental retardation (Behr, 1909; Thomas et al., 1984).&#13; Patients with mutations in genes other than OPA1 can present with clinical features reminiscent of Behr syndrome. Mutations in one of these genes, OPA3 (606580), result in type III 3-methylglutaconic aciduria (MGCA3; 258501). Lerman-Sagie (1995) noted that the abnormal urinary pattern in MGCA3 may not be picked up by routine organic acid analysis, suggesting that early reports of Behr syndrome with normal metabolic features may actually have been 3-methylglutaconic aciduria type III.</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/66358">Condition Record</a></div></div>
<div class="divPopper rprt" id="rdis_120642"><div><strong>Dopa-responsive dystonia due to sepiapterin reductase deficiency</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>120642</dd><dt><span class="dotprefix"></span>Concept ID: </dt><dd><a href="/medgen/docs/help/#sources" target="_blank" title="Concept Unique Identifier from NLM's Unified Medical Language system (UMLS)&#10;Click for more information.">C0268468</a></dd><dt><span class="dotprefix"></span></dt><dd>Disease or Syndrome</dd></dl></div></div></div>
<div class="spaceAbove">The phenotypic spectrum of sepiapterin reductase deficiency (SRD), which ranges from significant motor and cognitive deficits to only minimal findings, has not been completely elucidated. Clinical features in the majority of affected individuals include motor and speech delay, axial hypotonia, dystonia, weakness, and oculogyric crises; symptoms show diurnal fluctuation and sleep benefit. Other common features include parkinsonian signs (tremor, bradykinesia, masked facies, rigidity), limb hypertonia, hyperreflexia, intellectual disability, psychiatric and/or behavioral abnormalities, autonomic dysfunction, and sleep disturbances (hypersomnolence, difficulty initiating or maintaining sleep, and drowsiness). Most affected individuals have nonspecific features in infancy including developmental delays and axial hypotonia; other features develop over time.</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/120642">Condition Record</a></div></div>
<div class="divPopper rprt" id="rdis_78688"><div><strong>Arginase deficiency</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>78688</dd><dt><span class="dotprefix"></span>Concept ID: </dt><dd><a href="/medgen/docs/help/#sources" target="_blank" title="Concept Unique Identifier from NLM's Unified Medical Language system (UMLS)&#10;Click for more information."><span class="highlight" style="background-color:">C0268548</span></a></dd><dt><span class="dotprefix"></span></dt><dd>Disease or Syndrome</dd></dl></div></div></div>
<div class="spaceAbove">Arginase deficiency in untreated individuals is characterized by episodic hyperammonemia of variable degree that is infrequently severe enough to be life threatening or to cause death. Most commonly, birth and early childhood are normal. Untreated individuals have slowing of linear growth at age one to three years, followed by development of spasticity, plateauing of cognitive development, and subsequent loss of developmental milestones. If untreated, arginase deficiency usually progresses to severe spasticity, loss of ambulation, complete loss of bowel and bladder control, and severe intellectual disability. Seizures are common and are usually controlled easily. Individuals treated from birth, either as a result of newborn screening or having an affected older sib, appear to have minimal symptoms.</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/78688">Condition Record</a></div></div>
<div class="divPopper rprt" id="rdis_98278"><div><strong>Benign hereditary chorea</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>98278</dd><dt><span class="dotprefix"></span>Concept ID: </dt><dd><a href="/medgen/docs/help/#sources" target="_blank" title="Concept Unique Identifier from NLM's Unified Medical Language system (UMLS)&#10;Click for more information.">C0393584</a></dd><dt><span class="dotprefix"></span></dt><dd>Disease or Syndrome</dd></dl></div></div></div>
<div class="spaceAbove">NKX2-1-related disorders range from benign hereditary chorea (BHC) to choreoathetosis, congenital hypothyroidism, and neonatal respiratory distress syndrome (also known as brain-lung-thyroid syndrome). Childhood-onset chorea, the hallmark feature of NKX2-1-related disorders, may or may not be associated with pulmonary disease or congenital hypothyroidism. Age of onset of chorea varies from early infancy (most commonly) to late childhood or adolescence and may progress into the second decade, after which it remains static or (rarely) remits. Pulmonary disease, the second most common manifestation, can include respiratory distress syndrome in neonates, interstitial lung disease in young children, and pulmonary fibrosis in older individuals. The risk for pulmonary carcinoma is increased in young adults with NKX2-1-related disorders. Thyroid dysfunction, occurring as a result of thyroid dysgenesis, can present as congenital or compensated hypothyroidism. In one review, 50% of affected individuals had the full brain-lung-thyroid syndrome, 30% had brain and thyroid involvement only, and 13% had chorea only.</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/98278">Condition Record</a></div></div>
<div class="divPopper rprt" id="rdis_98290"><div><strong>Charcot-Marie-Tooth disease X-linked dominant 1</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>98290</dd><dt><span class="dotprefix"></span>Concept ID: </dt><dd><a href="/medgen/docs/help/#sources" target="_blank" title="Concept Unique Identifier from NLM's Unified Medical Language system (UMLS)&#10;Click for more information.">C0393808</a></dd><dt><span class="dotprefix"></span></dt><dd>Disease or Syndrome</dd></dl></div></div></div>
<div class="spaceAbove">GJB1 disorders are typically characterized by peripheral motor and sensory neuropathy with or without fixed CNS abnormalities and/or acute, self-limited episodes of transient neurologic dysfunction (especially weakness and dysarthria). Peripheral neuropathy typically manifests in affected males between ages five and 25 years. Although both men and women are affected, manifestations tend to be less severe in women, some of whom may remain asymptomatic. Less commonly, initial manifestations in some affected individuals are stroke-like episodes (acute fulminant episodes of reversible CNS dysfunction).</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/98290">Condition Record</a></div></div>
<div class="divPopper rprt" id="rdis_98048"><div><strong>Emery-Dreifuss muscular dystrophy 2, autosomal dominant</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>98048</dd><dt><span class="dotprefix"></span>Concept ID: </dt><dd><a href="/medgen/docs/help/#sources" target="_blank" title="Concept Unique Identifier from NLM's Unified Medical Language system (UMLS)&#10;Click for more information.">C0410190</a></dd><dt><span class="dotprefix"></span></dt><dd>Disease or Syndrome</dd></dl></div></div></div>
<div class="spaceAbove">Emery-Dreifuss muscular dystrophy (EDMD) is characterized by the clinical triad of: joint contractures that begin in early childhood; slowly progressive muscle weakness and wasting initially in a humero-peroneal distribution that later extends to the scapular and pelvic girdle muscles; and cardiac involvement that may manifest as palpitations, presyncope and syncope, poor exercise tolerance, and congestive heart failure along with variable cardiac rhythm disturbances. Age of onset, severity, and progression of muscle and cardiac involvement demonstrate both inter- and intrafamilial variability. Clinical variability ranges from early onset with severe presentation in childhood to late onset with slow progression in adulthood. In general, joint contractures appear during the first two decades, followed by muscle weakness and wasting. Cardiac involvement usually occurs after the second decade and respiratory function may be impaired in some individuals.</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/98048">Condition Record</a></div></div>
<div class="divPopper rprt" id="rdis_148458"><div><strong>Spinocerebellar ataxia type 6</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>148458</dd><dt><span class="dotprefix"></span>Concept ID: </dt><dd><a href="/medgen/docs/help/#sources" target="_blank" title="Concept Unique Identifier from NLM's Unified Medical Language system (UMLS)&#10;Click for more information.">C0752124</a></dd><dt><span class="dotprefix"></span></dt><dd>Disease or Syndrome</dd></dl></div></div></div>
<div class="spaceAbove">Spinocerebellar ataxia type 6 (SCA6) is characterized by adult-onset, slowly progressive cerebellar ataxia, dysarthria, and nystagmus. The age of onset ranges from 19 to 73 years; mean age of onset is between 43 and 52 years. Initial symptoms are gait unsteadiness, stumbling, and imbalance (in ~90%) and dysarthria (in ~10%). Eventually all persons have gait ataxia, upper-limb incoordination, intention tremor, and dysarthria. Dysphagia and choking are common. Visual disturbances may result from diplopia, difficulty fixating on moving objects, horizontal gaze-evoked nystagmus, and vertical nystagmus. Hyperreflexia and extensor plantar responses occur in up to 40%-50%. Basal ganglia signs, including dystonia and blepharospasm, occur in up to 25%. Mentation is generally preserved.</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/148458">Condition Record</a></div></div>
<div class="divPopper rprt" id="rdis_371304"><div><strong>Charcot-Marie-Tooth disease type 4D</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>371304</dd><dt><span class="dotprefix"></span>Concept ID: </dt><dd><a href="/medgen/docs/help/#sources" target="_blank" title="Concept Unique Identifier from NLM's Unified Medical Language system (UMLS)&#10;Click for more information.">C1832334</a></dd><dt><span class="dotprefix"></span></dt><dd>Disease or Syndrome</dd></dl></div></div></div>
<div class="spaceAbove">Charcot-Marie-Tooth disease type 4D (CMT4D) is an autosomal recessive disorder of the peripheral nervous system characterized by early-onset distal muscle weakness and atrophy, foot deformities, and sensory loss affecting all modalities. Affected individuals develop deafness by the third decade of life (summary by Okamoto et al., 2014).&#13; For a phenotypic description and a discussion of genetic heterogeneity of autosomal recessive Charcot-Marie-Tooth disease, see CMT4A (214400).</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/371304">Condition Record</a></div></div>
<div class="divPopper rprt" id="rdis_371854"><div><strong>Spinal muscular atrophy-progressive myoclonic epilepsy syndrome</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>371854</dd><dt><span class="dotprefix"></span>Concept ID: </dt><dd><a href="/medgen/docs/help/#sources" target="_blank" title="Concept Unique Identifier from NLM's Unified Medical Language system (UMLS)&#10;Click for more information.">C1834569</a></dd><dt><span class="dotprefix"></span></dt><dd>Disease or Syndrome</dd></dl></div></div></div>
<div class="spaceAbove">The spectrum of ASAH1-related disorders ranges from Farber disease (FD) to spinal muscular atrophy with progressive myoclonic epilepsy (SMA-PME). Classic FD is characterized by onset in the first weeks of life of painful, progressive deformity of the major joints; palpable subcutaneous nodules of joints and mechanical pressure points; and a hoarse cry resulting from granulomas of the larynx and epiglottis. Life expectancy is usually less than two years. In the other less common types of FD, onset, severity, and primary manifestations vary. SMA-PME is characterized by early-childhood-onset progressive lower motor neuron disease manifest typically between ages three and seven years as proximal lower-extremity weakness, followed by progressive myoclonic and atonic seizures, tremulousness/tremor, and sensorineural hearing loss. Myoclonic epilepsy typically begins in late childhood after the onset of weakness and can include jerking of the upper limbs, action myoclonus, myoclonic status, and eyelid myoclonus. Other findings include generalized tremor, and cognitive decline. The time from disease onset to death from respiratory complications is usually five to 15 years.</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/371854">Condition Record</a></div></div>
<div class="divPopper rprt" id="rdis_373138"><div><strong>Hereditary spastic paraplegia 26</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>373138</dd><dt><span class="dotprefix"></span>Concept ID: </dt><dd><a href="/medgen/docs/help/#sources" target="_blank" title="Concept Unique Identifier from NLM's Unified Medical Language system (UMLS)&#10;Click for more information.">C1836632</a></dd><dt><span class="dotprefix"></span></dt><dd>Disease or Syndrome</dd></dl></div></div></div>
<div class="spaceAbove">SPG26 is an autosomal recessive form of complicated spastic paraplegia characterized by onset in the first 2 decades of life of gait abnormalities due to lower limb spasticity and muscle weakness. Some patients have upper limb involvement. Additional features include intellectual disability, peripheral neuropathy, dysarthria, cerebellar signs, extrapyramidal signs, and cortical atrophy. The disorder is slowly progressive (summary by Boukhris et al., 2013).&#13; For a discussion of genetic heterogeneity of autosomal recessive SPG, see SPG5A (270800).</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/373138">Condition Record</a></div></div>
<div class="divPopper rprt" id="rdis_332346"><div><strong>Autosomal dominant sensory ataxia 1</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>332346</dd><dt><span class="dotprefix"></span>Concept ID: </dt><dd><a href="/medgen/docs/help/#sources" target="_blank" title="Concept Unique Identifier from NLM's Unified Medical Language system (UMLS)&#10;Click for more information.">C1837015</a></dd><dt><span class="dotprefix"></span></dt><dd>Disease or Syndrome</dd></dl></div></div></div>
<div class="spaceAbove">Autosomal dominant sensory ataxia-1 (SNAX1) is a peripheral neuropathy resulting from the degeneration of dorsal root ganglia that affects both central and peripheral neurites of sensory neurons. Affected individuals show adult onset of slowly progressive clumsiness, gait ataxia, walking difficulties, and distal sensory loss which may be associated with abnormal sensory nerve conduction values. Some patients have vestibular ocular dysfunction. Muscle weakness and atrophy are not observed, and brain imaging is normal (summary by Cortese et al., 2020).</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/332346">Condition Record</a></div></div>
<div class="divPopper rprt" id="rdis_374113"><div><strong>Striatonigral degeneration, infantile, mitochondrial</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>374113</dd><dt><span class="dotprefix"></span>Concept ID: </dt><dd><a href="/medgen/docs/help/#sources" target="_blank" title="Concept Unique Identifier from NLM's Unified Medical Language system (UMLS)&#10;Click for more information.">C1839022</a></dd><dt><span class="dotprefix"></span></dt><dd>Disease or Syndrome</dd></dl></div></div></div>
<div class="spaceAbove nowrap">See: <a href="/medgen/374113">Condition Record</a></div></div>
<div class="divPopper rprt" id="rdis_375127"><div><strong>Charcot-Marie-Tooth disease type 2E</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>375127</dd><dt><span class="dotprefix"></span>Concept ID: </dt><dd><a href="/medgen/docs/help/#sources" target="_blank" title="Concept Unique Identifier from NLM's Unified Medical Language system (UMLS)&#10;Click for more information.">C1843225</a></dd><dt><span class="dotprefix"></span></dt><dd>Disease or Syndrome</dd></dl></div></div></div>
<div class="spaceAbove">A form of axonal Charcot-Marie-Tooth disease a peripheral sensorimotor neuropathy. Onset is in the first to sixth decade with a gait anomaly and a leg weakness that reaches the arms secondarily. Tendon reflexes are reduced or absent and after years all patients have a pes cavus. Other signs may be present including hearing loss and postural tremor.</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/375127">Condition Record</a></div></div>
<div class="divPopper rprt" id="rdis_375289"><div><strong>Biotin-responsive basal ganglia disease</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>375289</dd><dt><span class="dotprefix"></span>Concept ID: </dt><dd><a href="/medgen/docs/help/#sources" target="_blank" title="Concept Unique Identifier from NLM's Unified Medical Language system (UMLS)&#10;Click for more information.">C1843807</a></dd><dt><span class="dotprefix"></span></dt><dd>Disease or Syndrome</dd></dl></div></div></div>
<div class="spaceAbove">Biotin-thiamine-responsive basal ganglia disease (BTBGD) may present in early infancy, childhood, or adulthood. Early-infantile BTBGD presents before age three months with vomiting, feeding difficulties, encephalopathy, hypotonia, seizures, and respiratory failure. Classic BTBGD presents between ages three and ten years with recurrent subacute encephalopathy manifesting as confusion, seizures, ataxia, supranuclear facial palsy, external ophthalmoplegia, and/or dysphagia that, if left untreated, can eventually lead to coma and even death. Dystonia and cogwheel rigidity are nearly always present; hyperreflexia, ankle clonus, and Babinski responses are common. Hemiparesis or quadriparesis may be seen. Episodes are often triggered by febrile illness or mild trauma or stress. Simple partial or generalized seizures are easily controlled with anti-seizure medication. Adult Wernicke-like encephalopathy BTBGD, described in three individuals to date, presents after age ten years with acute onset of status epilepticus, ataxia, nystagmus, diplopia, and ophthalmoplegia. Prompt administration of biotin and thiamine early in the disease course results in partial or complete improvement within days in classic and adult BTBGD; however, most infants with early-infantile BTBGD have a poor outcome.</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/375289">Condition Record</a></div></div>
<div class="divPopper rprt" id="rdis_375302"><div><strong>Sensory ataxic neuropathy, dysarthria, and ophthalmoparesis</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>375302</dd><dt><span class="dotprefix"></span>Concept ID: </dt><dd><a href="/medgen/docs/help/#sources" target="_blank" title="Concept Unique Identifier from NLM's Unified Medical Language system (UMLS)&#10;Click for more information.">C1843851</a></dd><dt><span class="dotprefix"></span></dt><dd>Disease or Syndrome</dd></dl></div></div></div>
<div class="spaceAbove">POLG-related disorders comprise a continuum of overlapping phenotypes that were clinically defined before the molecular basis was known. POLG-related disorders can therefore be considered an overlapping spectrum of disease presenting from early childhood to late adulthood. The age of onset broadly correlates with the clinical phenotype. In individuals with early-onset disease (prior to age 12 years), liver involvement, feeding difficulties, seizures, hypotonia, and muscle weakness are the most common clinical features. This group has the worst prognosis. In the juvenile/adult-onset form (age 12-40 years), disease is typically characterized by peripheral neuropathy, ataxia, seizures, stroke-like episodes, and, in individuals with longer survival, progressive external ophthalmoplegia (PEO). This group generally has a better prognosis than the early-onset group. Late-onset disease (after age 40 years) is characterized by ptosis and PEO, with additional features such as peripheral neuropathy, ataxia, and muscle weakness. This group overall has the best prognosis.</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/375302">Condition Record</a></div></div>
<div class="divPopper rprt" id="rdis_335442"><div><strong>Autosomal recessive cerebellar ataxia-saccadic intrusion syndrome</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>335442</dd><dt><span class="dotprefix"></span>Concept ID: </dt><dd><a href="/medgen/docs/help/#sources" target="_blank" title="Concept Unique Identifier from NLM's Unified Medical Language system (UMLS)&#10;Click for more information.">C1846492</a></dd><dt><span class="dotprefix"></span></dt><dd>Disease or Syndrome</dd></dl></div></div></div>
<div class="spaceAbove">VPS13D movement disorder is a hyperkinetic movement disorder (dystonia, chorea, and/or ataxia) of variable age of onset that can be associated with developmental delay. Onset ranges from birth to adulthood. Individuals can present in childhood with motor delays and gait instability. Cognitive impairment ranging from mild intellectual disability to developmental delay has been reported, and several individuals have normal cognitive function. Individuals have also presented as young adults with gait difficulties caused by spastic ataxia or ataxia. In addition to gait ataxia, affected individuals had limb ataxia, dysarthria, and eye movement abnormalities (macro-saccadic oscillations, nystagmus, and saccadic pursuit). Additional features reported in some individuals include peripheral neuropathy and/or seizures. The disorder progresses to spastic ataxia or generalized dystonia, which can lead to loss of independent ambulation.</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/335442">Condition Record</a></div></div>
<div class="divPopper rprt" id="rdis_339580"><div><strong>Autosomal recessive limb-girdle muscular dystrophy type 2I</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>339580</dd><dt><span class="dotprefix"></span>Concept ID: </dt><dd><a href="/medgen/docs/help/#sources" target="_blank" title="Concept Unique Identifier from NLM's Unified Medical Language system (UMLS)&#10;Click for more information.">C1846672</a></dd><dt><span class="dotprefix"></span></dt><dd>Disease or Syndrome</dd></dl></div></div></div>
<div class="spaceAbove">MDGDC5 is an autosomal recessive muscular dystrophy characterized by variable age at onset, normal cognition, and no structural brain changes (Brockington et al., 2001). It is part of a group of similar disorders resulting from defective glycosylation of alpha-dystroglycan (DAG1; 128239), collectively known as 'dystroglycanopathies' (Mercuri et al., 2006).&#13; For a discussion of genetic heterogeneity of muscular dystrophy-dystroglycanopathy type C, see MDDGC1 (609308).</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/339580">Condition Record</a></div></div>
<div class="divPopper rprt" id="rdis_335764"><div><strong>Muscular dystrophy-dystroglycanopathy type B5</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>335764</dd><dt><span class="dotprefix"></span>Concept ID: </dt><dd><a href="/medgen/docs/help/#sources" target="_blank" title="Concept Unique Identifier from NLM's Unified Medical Language system (UMLS)&#10;Click for more information.">C1847759</a></dd><dt><span class="dotprefix"></span></dt><dd>Disease or Syndrome</dd></dl></div></div></div>
<div class="spaceAbove">MDDGB5 is an autosomal recessive congenital muscular dystrophy with impaired intellectual development and structural brain abnormalities (Brockington et al., 2001). It is part of a group of similar disorders resulting from defective glycosylation of alpha-dystroglycan (DAG1; 128239), collectively known as 'dystroglycanopathies' (Mercuri et al., 2006).&#13; For a discussion of genetic heterogeneity of congenital muscular dystrophy-dystroglycanopathy type B, see MDDGB1 (613155).</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/335764">Condition Record</a></div></div>
<div class="divPopper rprt" id="rdis_342534"><div><strong>Nemaline myopathy 2</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>342534</dd><dt><span class="dotprefix"></span>Concept ID: </dt><dd><a href="/medgen/docs/help/#sources" target="_blank" title="Concept Unique Identifier from NLM's Unified Medical Language system (UMLS)&#10;Click for more information.">C1850569</a></dd><dt><span class="dotprefix"></span></dt><dd>Disease or Syndrome</dd></dl></div></div></div>
<div class="spaceAbove">Nemaline myopathy-2 (NEM2) is an autosomal recessive skeletal muscle disorder with a wide range of severity. The most common clinical presentation is early-onset (in infancy or childhood) muscle weakness predominantly affecting proximal limb muscles. Muscle biopsy shows accumulation of Z-disc and thin filament proteins into aggregates named 'nemaline bodies' or 'nemaline rods,' usually accompanied by disorganization of the muscle Z discs. The clinical and histologic spectrum of entities caused by variants in the NEB gene is a continuum, ranging in severity. The distribution of weakness can vary from generalized muscle weakness, more pronounced in proximal limb muscles, to distal-only involvement, although neck flexor weakness appears to be rather consistent. Histologic patterns range from a severe usually nondystrophic disturbance of the myofibrillar pattern to an almost normal pattern, with or without nemaline bodies, sometimes combined with cores (summary by Lehtokari et al., 2014).&#13; Genetic Heterogeneity of Nemaline Myopathy&#13; See also NEM1 (255310), caused by mutation in the tropomyosin-3 gene (TPM3; 191030) on chromosome 1q21; NEM3 (161800), caused by mutation in the alpha-actin-1 gene (ACTA1; 102610) on chromosome 1q42; NEM4 (609285), caused by mutation in the beta-tropomyosin gene (TPM2; 190990) on chromosome 9p13; NEM5A (605355), also known as Amish nemaline myopathy, NEM5B (620386), and NEM5C (620389), all caused by mutation in the troponin T1 gene (TNNT1; 191041) on chromosome 19q13; NEM6 (609273), caused by mutation in the KBTBD13 gene (613727) on chromosome 15q22; NEM7 (610687), caused by mutation in the cofilin-2 gene (CFL2; 601443) on chromosome 14q13; NEM8 (615348), caused by mutation in the KLHL40 gene (615340), on chromosome 3p22; NEM9 (615731), caused by mutation in the KLHL41 gene (607701) on chromosome 2q31; NEM10 (616165), caused by mutation in the LMOD3 gene (616112) on chromosome 3p14; and NEM11 (617336), caused by mutation in the MYPN gene (608517) on chromosome 10q21. Several of the genes encode components of skeletal muscle sarcomeric thin filaments (Sanoudou and Beggs, 2001).&#13; Mutations in the NEB gene are the most common cause of nemaline myopathy (Lehtokari et al., 2006).</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/342534">Condition Record</a></div></div>
<div class="divPopper rprt" id="rdis_342573"><div><strong>Hereditary myopathy with lactic acidosis due to ISCU deficiency</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>342573</dd><dt><span class="dotprefix"></span>Concept ID: </dt><dd><a href="/medgen/docs/help/#sources" target="_blank" title="Concept Unique Identifier from NLM's Unified Medical Language system (UMLS)&#10;Click for more information.">C1850718</a></dd><dt><span class="dotprefix"></span></dt><dd>Disease or Syndrome</dd></dl></div></div></div>
<div class="spaceAbove">Hereditary myopathy with lactic acidosis (HML) is an autosomal recessive muscular disorder characterized by childhood onset of exercise intolerance with muscle tenderness, cramping, dyspnea, and palpitations. Biochemical features include lactic acidosis and, rarely, rhabdomyolysis. It is a chronic disorder with remission and exacerbation of the muscle phenotype (summary by Sanaker et al., 2010).</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/342573">Condition Record</a></div></div>
<div class="divPopper rprt" id="rdis_343979"><div><strong>Nemaline myopathy 7</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>343979</dd><dt><span class="dotprefix"></span>Concept ID: </dt><dd><a href="/medgen/docs/help/#sources" target="_blank" title="Concept Unique Identifier from NLM's Unified Medical Language system (UMLS)&#10;Click for more information.">C1853154</a></dd><dt><span class="dotprefix"></span></dt><dd>Disease or Syndrome</dd></dl></div></div></div>
<div class="spaceAbove">Nemaline myopathy-7 is an autosomal recessive congenital myopathy characterized by very early onset of hypotonia and delayed motor development. Affected individuals have difficulty walking and running due to proximal muscle weakness. The disorder is slowly progressive, and patients may lose independent ambulation. Muscle biopsy shows nemaline rods and may later show minicores, abnormal protein aggregates, and dystrophic changes (summary by Ockeloen et al., 2012).&#13; For a discussion of genetic heterogeneity of nemaline myopathy, see 161800.</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/343979">Condition Record</a></div></div>
<div class="divPopper rprt" id="rdis_350930"><div><strong>Myopathy, myofibrillar, 9, with early respiratory failure</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>350930</dd><dt><span class="dotprefix"></span>Concept ID: </dt><dd><a href="/medgen/docs/help/#sources" target="_blank" title="Concept Unique Identifier from NLM's Unified Medical Language system (UMLS)&#10;Click for more information.">C1863599</a></dd><dt><span class="dotprefix"></span></dt><dd>Disease or Syndrome</dd></dl></div></div></div>
<div class="spaceAbove">Hereditary myopathy with early respiratory failure (HMERF) is a slowly progressive myopathy that typically begins in the third to fifth decades of life. The usual presenting findings are gait disturbance relating to distal leg weakness or nocturnal respiratory symptoms due to respiratory muscle weakness. Weakness eventually generalizes and affects both proximal and distal muscles. Most affected individuals require walking aids within a few years of onset; some progress to wheelchair dependence and require nocturnal noninvasive ventilatory support about ten years after onset. The phenotype varies even among individuals within the same family: some remain ambulant until their 70s whereas others may require ventilator support in their 40s.</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/350930">Condition Record</a></div></div>
<div class="divPopper rprt" id="rdis_370585"><div><strong>Autosomal recessive limb-girdle muscular dystrophy type 2M</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>370585</dd><dt><span class="dotprefix"></span>Concept ID: </dt><dd><a href="/medgen/docs/help/#sources" target="_blank" title="Concept Unique Identifier from NLM's Unified Medical Language system (UMLS)&#10;Click for more information.">C1969040</a></dd><dt><span class="dotprefix"></span></dt><dd>Disease or Syndrome</dd></dl></div></div></div>
<div class="spaceAbove">MDDGC4 is an autosomal recessive muscular dystrophy with onset in infancy or early childhood. Cognition and brain structure are usually normal (Godfrey et al., 2006). It is part of a group of similar disorders resulting from defective glycosylation of alpha-dystroglycan (DAG1; 128239), collectively known as 'dystroglycanopathies' (Mercuri et al., 2009).</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/370585">Condition Record</a></div></div>
<div class="divPopper rprt" id="rdis_370750"><div><strong>Spastic ataxia 2</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>370750</dd><dt><span class="dotprefix"></span>Concept ID: </dt><dd><a href="/medgen/docs/help/#sources" target="_blank" title="Concept Unique Identifier from NLM's Unified Medical Language system (UMLS)&#10;Click for more information.">C1969796</a></dd><dt><span class="dotprefix"></span></dt><dd>Disease or Syndrome</dd></dl></div></div></div>
<div class="spaceAbove">Autosomal recessive spastic ataxia-2 (SPAX2) is a neurologic disorder characterized by onset in the first 2 decades of cerebellar ataxia, dysarthria, and variable spasticity of the lower limbs. Cognition is not affected (summary by Dor et al., 2014).&#13; For a discussion of genetic heterogeneity of spastic ataxia, see SPAX1 (108600).</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/370750">Condition Record</a></div></div>
<div class="divPopper rprt" id="rdis_370808"><div><strong>Charcot-Marie-Tooth disease type 4J</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>370808</dd><dt><span class="dotprefix"></span>Concept ID: </dt><dd><a href="/medgen/docs/help/#sources" target="_blank" title="Concept Unique Identifier from NLM's Unified Medical Language system (UMLS)&#10;Click for more information.">C1970011</a></dd><dt><span class="dotprefix"></span></dt><dd>Disease or Syndrome</dd></dl></div></div></div>
<div class="spaceAbove">Charcot-Marie-Tooth disease type 4J (CMT4J) is an autosomal recessive progressive neurologic disorder with a highly variable phenotype and onset ranging from early childhood to adulthood. Most patients have both proximal and distal asymmetric muscle weakness of the upper and lower limbs. There is significant motor dysfunction, followed by variably progressive sensory loss, which may be mild. Nerve conduction studies and nerve biopsies indicate demyelination as well as axonal loss (summary by Nicholson et al., 2011).&#13; For a phenotypic description and a discussion of genetic heterogeneity of autosomal recessive demyelinating Charcot-Marie-Tooth disease, see CMT4A (214400).</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/370808">Condition Record</a></div></div>
<div class="divPopper rprt" id="rdis_413474"><div><strong>Neuropathy, hereditary sensory and autonomic, type 2B</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>413474</dd><dt><span class="dotprefix"></span>Concept ID: </dt><dd><a href="/medgen/docs/help/#sources" target="_blank" title="Concept Unique Identifier from NLM's Unified Medical Language system (UMLS)&#10;Click for more information.">C2751092</a></dd><dt><span class="dotprefix"></span></dt><dd>Disease or Syndrome</dd></dl></div></div></div>
<div class="spaceAbove">Hereditary sensory and autonomic neuropathy type II (HSAN2) is characterized by progressively reduced sensation to pain, temperature, and touch. Onset can be at birth and is often before puberty. The sensory deficit is predominantly distal with the lower limbs more severely affected than the upper limbs. Over time sensory function becomes severely reduced. Unnoticed injuries and neuropathic skin promote ulcerations and infections that result in spontaneous amputation of digits or the need for surgical amputation. Osteomyelitis is common. Painless fractures can complicate the disease. Autonomic disturbances are variable and can include hyperhidrosis, tonic pupils, and urinary incontinence in those with more advanced disease.</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/413474">Condition Record</a></div></div>
<div class="divPopper rprt" id="rdis_481850"><div><strong>Charcot-Marie-Tooth disease axonal type 2O</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>481850</dd><dt><span class="dotprefix"></span>Concept ID: </dt><dd><a href="/medgen/docs/help/#sources" target="_blank" title="Concept Unique Identifier from NLM's Unified Medical Language system (UMLS)&#10;Click for more information.">C3280220</a></dd><dt><span class="dotprefix"></span></dt><dd>Disease or Syndrome</dd></dl></div></div></div>
<div class="spaceAbove">DYNC1H1-related disorders are primarily characterized by an axonal neuropathy with a wide phenotypic spectrum ranging from a neuromuscular-only phenotype (DYNC1H1-related neuromuscular disorder, or DYNC1H1-NMD) to phenotypes involving both the central nervous system and peripheral nervous system referred to collectively as DYNC1H1-related neurodevelopmental disorder (DYNC1H1-NDD). DYNC1H1-NMD manifestations are limited to the peripheral nervous system and characterized predominantly by motor neuropathy initially most pronounced in the lower limbs; muscle weakness and atrophy variably associated with foot deformities, contractures, and other skeletal involvement; and/or delayed motor milestones. DYNC1H1-NDD manifestations include motor axonal neuropathy and often global developmental delay / intellectual disability, epilepsy, neurobehavioral/psychiatric manifestations, and movement disorders with or without malformations of cortical development and/or microcephaly. In an individual with more significant central nervous system involvement, the motor axonal neuropathy may not be evident clinically and, thus, is only detected on further evaluation such as electrophysiologic testing.</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/481850">Condition Record</a></div></div>
<div class="divPopper rprt" id="rdis_761667"><div><strong>Myoclonus, familial, 1</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>761667</dd><dt><span class="dotprefix"></span>Concept ID: </dt><dd><a href="/medgen/docs/help/#sources" target="_blank" title="Concept Unique Identifier from NLM's Unified Medical Language system (UMLS)&#10;Click for more information.">C3539916</a></dd><dt><span class="dotprefix"></span></dt><dd>Disease or Syndrome</dd></dl></div></div></div>
<div class="spaceAbove">Familial myoclonus-1 (MYOCL1) is an autosomal dominant neurologic condition characterized by adult onset of cortical myoclonus manifest as involuntary jerks or movements affecting the face and limbs. Affected individuals can also experience falls without seizure activity or loss of consciousness (summary by Russell et al., 2012).&#13; Genetic Heterogeneity of Familial Myoclonus&#13; Also see MYOCL2 (618364), caused by mutation in the SCN8A gene (600702) on chromosome 12q13.</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/761667">Condition Record</a></div></div>
<div class="divPopper rprt" id="rdis_766874"><div><strong>Peroxisome biogenesis disorder 8B</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>766874</dd><dt><span class="dotprefix"></span>Concept ID: </dt><dd><a href="/medgen/docs/help/#sources" target="_blank" title="Concept Unique Identifier from NLM's Unified Medical Language system (UMLS)&#10;Click for more information.">C3553960</a></dd><dt><span class="dotprefix"></span></dt><dd>Disease or Syndrome</dd></dl></div></div></div>
<div class="spaceAbove">The overlapping phenotypes of neonatal adrenoleukodystrophy (NALD) and infantile Refsum disease (IRD) represent the milder manifestations of the Zellweger syndrome spectrum (ZSS) of peroxisome biogenesis disorders. The clinical course of patients with the NALD and IRD presentation is variable and may include developmental delay, hypotonia, liver dysfunction, sensorineural hearing loss, retinal dystrophy, and visual impairment. Children with the NALD presentation may reach their teens, and those with the IRD presentation may reach adulthood (summary by Waterham and Ebberink, 2012).&#13; For a complete phenotypic description and a discussion of genetic heterogeneity of PBD(NALD/IRD), see 601539.&#13; Individuals with mutations in the PEX16 gene have cells of complementation group 9 (CG9, equivalent to CGD). For information on the history of PBD complementation groups, see 214100.</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/766874">Condition Record</a></div></div>
<div class="divPopper rprt" id="rdis_767604"><div><strong>Ataxia with oculomotor apraxia type 3</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>767604</dd><dt><span class="dotprefix"></span>Concept ID: </dt><dd><a href="/medgen/docs/help/#sources" target="_blank" title="Concept Unique Identifier from NLM's Unified Medical Language system (UMLS)&#10;Click for more information.">C3554690</a></dd><dt><span class="dotprefix"></span></dt><dd>Disease or Syndrome</dd></dl></div></div></div>
<div class="spaceAbove">AOA3 is an autosomal recessive progressive neurologic disorder with onset in the second decade of life (Al Tassan et al., 2012).&#13; For a discussion of genetic heterogeneity of ataxia-oculomotor apraxia, see AOA1 (208920).</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/767604">Condition Record</a></div></div>
<div class="divPopper rprt" id="rdis_777997"><div><strong>Actin accumulation myopathy</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>777997</dd><dt><span class="dotprefix"></span>Concept ID: </dt><dd><a href="/medgen/docs/help/#sources" target="_blank" title="Concept Unique Identifier from NLM's Unified Medical Language system (UMLS)&#10;Click for more information.">C3711389</a></dd><dt><span class="dotprefix"></span></dt><dd>Disease or Syndrome</dd></dl></div></div></div>
<div class="spaceAbove">Congenital myopathy-2A (CMYO2A) is an autosomal dominant disorder of the skeletal muscle characterized by infantile- or childhood-onset myopathy with delayed motor milestones and nonprogressive muscle weakness. Of the patients with congenital myopathy caused by mutation in the ACTA1 gene, about 90% carry heterozygous mutations that are usually de novo and cause the severe infantile phenotype (CMYO2C; 620278). Some patients with de novo mutations have a more typical and milder disease course with delayed motor development and proximal muscle weakness, but are able to achieve independent ambulation. Less frequently, autosomal dominant transmission of the disorder within a family may occur when the ACTA1 mutation produces a phenotype compatible with adult life. Of note, intrafamilial variability has also been reported: a severely affected proband may be identified and then mildly affected or even asymptomatic relatives are found to carry the same mutation. The severity of the disease most likely depends on the detrimental effect of the mutation, although there are probably additional modifying factors (Ryan et al., 2001; Laing et al., 2009; Sanoudou and Beggs, 2001; Agrawal et al., 2004; Nowak et al., 2013; Sewry et al., 2019; Laitila and Wallgren-Pettersson, 2021).&#13; The most common histologic finding on muscle biopsy in patients with ACTA1 mutations is the presence of 'nemaline rods,' which represent abnormal thread- or rod-like structures ('nema' is Greek for 'thread'). However, skeletal muscle biopsy from patients with mutations in the ACTA1 gene can show a range of pathologic phenotypes. These include classic rods, intranuclear rods, clumped filaments, cores, or fiber-type disproportion, all of which are nonspecific pathologic findings and not pathognomonic of a specific congenital myopathy. Most patients have clinically severe disease, regardless of the histopathologic phenotype (Nowak et al., 2007; Sewry et al., 2019). ACTA1 mutations are the second most common cause of congenital myopathies classified histologically as 'nemaline myopathy' after mutations in the NEB gene (161650). ACTA1 mutations are overrepresented in the severe phenotype with early death (Laing et al., 2009).&#13; For a discussion of genetic heterogeneity of congenital myopathy, see CMYO1A (117000).&#13; For a discussion of genetic heterogeneity of nemaline myopathy, see NEM2 (256030).</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/777997">Condition Record</a></div></div>
<div class="divPopper rprt" id="rdis_816615"><div><strong>Proximal myopathy with extrapyramidal signs</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>816615</dd><dt><span class="dotprefix"></span>Concept ID: </dt><dd><a href="/medgen/docs/help/#sources" target="_blank" title="Concept Unique Identifier from NLM's Unified Medical Language system (UMLS)&#10;Click for more information.">C3810285</a></dd><dt><span class="dotprefix"></span></dt><dd>Disease or Syndrome</dd></dl></div></div></div>
<div class="spaceAbove">Myopathy with extrapyramidal signs is an autosomal recessive disorder characterized by early childhood onset of proximal muscle weakness and learning disabilities. While the muscle weakness is static, most patients develop progressive extrapyramidal signs that may become disabling (summary by Logan et al., 2014). Brain MRI in 1 patient showed congenital malformations, including polymicrogyria and cerebellar dysplasia (Wilton et al., 2020).</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/816615">Condition Record</a></div></div>
<div class="divPopper rprt" id="rdis_855217"><div><strong>Spinocerebellar ataxia type 37</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>855217</dd><dt><span class="dotprefix"></span>Concept ID: </dt><dd><a href="/medgen/docs/help/#sources" target="_blank" title="Concept Unique Identifier from NLM's Unified Medical Language system (UMLS)&#10;Click for more information.">C3889636</a></dd><dt><span class="dotprefix"></span></dt><dd>Disease or Syndrome</dd></dl></div></div></div>
<div class="spaceAbove">Spinocerebellar ataxia type 37 (SCA37) is characterized by adult onset, dysarthria, slowly progressive gait and limb ataxia with severe dysmetria in the lower extremities, mild dysmetria in the upper extremities, dysphagia, and abnormal ocular movements (dysmetric vertical saccades, irregular and slow vertical smooth pursuit, slow vertical optokinetic nystagmus, and oscillopsia (visual disturbance in which objects appear to oscillate). In most individuals, the initial signs/symptoms include falls, dysarthria, or clumsiness followed by a complete cerebellar syndrome. A distinctive clinical feature is the presence of altered vertical eye movements in early stages of the disease, even preceding ataxia symptoms. Clinical progression is slow and affected individuals usually become wheelchair bound between ten and 33 years after disease onset.</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/855217">Condition Record</a></div></div>
<div class="divPopper rprt" id="rdis_860163"><div><strong>Myopathy, tubular aggregate, 1</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>860163</dd><dt><span class="dotprefix"></span>Concept ID: </dt><dd><a href="/medgen/docs/help/#sources" target="_blank" title="Concept Unique Identifier from NLM's Unified Medical Language system (UMLS)&#10;Click for more information.">C4011726</a></dd><dt><span class="dotprefix"></span></dt><dd>Disease or Syndrome</dd></dl></div></div></div>
<div class="spaceAbove">Tubular aggregates in muscle, first described by Engel (1964), are structures of variable appearance consisting of an outer tubule containing either one or more microtubule-like structures or amorphous material. They are a nonspecific pathologic finding that may occur in a variety of circumstances, including alcohol- and drug-induced myopathies, exercise-induced cramps or muscle weakness, and inherited myopathies. Tubular aggregates are derived from the sarcoplasmic reticulum (Salviati et al., 1985) and are believed to represent an adaptive mechanism aimed at regulating an increased intracellular level of calcium in order to prevent the muscle fibers from hypercontraction and necrosis (Martin et al., 1997; Muller et al., 2001).&#13; Genetic Heterogeneity of Tubular Aggregate Myopathy&#13; See also TAM2 (615883), caused by mutation in the ORAI1 gene (610277) on chromosome 12q24.</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/860163">Condition Record</a></div></div>
<div class="divPopper rprt" id="rdis_861227"><div><strong>Ataxia-telangiectasia-like disorder 1</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>861227</dd><dt><span class="dotprefix"></span>Concept ID: </dt><dd><a href="/medgen/docs/help/#sources" target="_blank" title="Concept Unique Identifier from NLM's Unified Medical Language system (UMLS)&#10;Click for more information.">C4012790</a></dd><dt><span class="dotprefix"></span></dt><dd>Disease or Syndrome</dd></dl></div></div></div>
<div class="spaceAbove">Ataxia-telangiectasia-like disorder-1 is an autosomal recessive disorder characterized clinically by progressive cerebellar degeneration resulting in ataxia and oculomotor apraxia. Laboratory studies of patient cells showed increased susceptibility to radiation, consistent with a defect in DNA repair. The disorder shares some phenotypic features of ataxia-telangiectasia (AT; 208900), but telangiectases and immune deficiency are not present in ATLD1 (summary by Hernandez et al., 1993 and Stewart et al., 1999).&#13; Genetic Heterogeneity of Ataxia-Telangiectasia-Like Disorder&#13; See also ATLD2 (615919), caused by mutation in the PCNA gene (176740) on chromosome 20p12.</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/861227">Condition Record</a></div></div>
<div class="divPopper rprt" id="rdis_863738"><div><strong>Autosomal recessive spinocerebellar ataxia 17</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>863738</dd><dt><span class="dotprefix"></span>Concept ID: </dt><dd><a href="/medgen/docs/help/#sources" target="_blank" title="Concept Unique Identifier from NLM's Unified Medical Language system (UMLS)&#10;Click for more information.">C4015301</a></dd><dt><span class="dotprefix"></span></dt><dd>Disease or Syndrome</dd></dl></div></div></div>
<div class="spaceAbove">Autosomal recessive spinocerebellar ataxia-17 (SCAR17) is a neurologic disorder characterized by onset of gait ataxia and cerebellar signs in early childhood. Patients also have variably impaired intellectual development (summary by Evers et al., 2016).</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/863738">Condition Record</a></div></div>
<div class="divPopper rprt" id="rdis_864033"><div><strong>Congenital myasthenic syndrome 15</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>864033</dd><dt><span class="dotprefix"></span>Concept ID: </dt><dd><a href="/medgen/docs/help/#sources" target="_blank" title="Concept Unique Identifier from NLM's Unified Medical Language system (UMLS)&#10;Click for more information.">C4015596</a></dd><dt><span class="dotprefix"></span></dt><dd>Disease or Syndrome</dd></dl></div></div></div>
<div class="spaceAbove">Congenital myasthenic syndrome-15 is one of a heterogeneous group of disorders that arise from impaired signal transmission at the neuromuscular synapse and are characterized by fatigable muscle weakness (summary by Cossins et al., 2013).&#13; For a discussion of genetic heterogeneity of CMS, see CMS1A (601462).</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/864033">Condition Record</a></div></div>
<div class="divPopper rprt" id="rdis_904593"><div><strong>Myopathy, reducing body, X-linked, childhood-onset</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>904593</dd><dt><span class="dotprefix"></span>Concept ID: </dt><dd><a href="/medgen/docs/help/#sources" target="_blank" title="Concept Unique Identifier from NLM's Unified Medical Language system (UMLS)&#10;Click for more information.">C4225159</a></dd><dt><span class="dotprefix"></span></dt><dd>Disease or Syndrome</dd></dl></div></div></div>
<div class="spaceAbove">Reducing-body myopathy (RBM) is a rare myopathy characterized pathologically by the presence of intracytoplasmic inclusion bodies strongly stained by menadione-linked alpha-glycerophosphate dehydrogenase (MAG) in the absence of substrate, alpha-glycerophosphate. The term 'reducing body' refers to the reducing activity of the inclusions to nitroblue tetrazolium (NBT) in the absence of substrate. This condition is also commonly associated with rimmed vacuoles and cytoplasmic bodies. The clinical features of RBM are variable; a severe form has onset in infancy or early childhood and results in severe disability or early death (RBMX1A; 300717), and a less severe form has onset in late childhood or adulthood (RBMX1B) (summary by Liewluck et al., 2007 and Shalaby et al., 2009).</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/904593">Condition Record</a></div></div>
<div class="divPopper rprt" id="rdis_901242"><div><strong>Progressive myoclonic epilepsy type 9</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>901242</dd><dt><span class="dotprefix"></span>Concept ID: </dt><dd><a href="/medgen/docs/help/#sources" target="_blank" title="Concept Unique Identifier from NLM's Unified Medical Language system (UMLS)&#10;Click for more information.">C4225289</a></dd><dt><span class="dotprefix"></span></dt><dd>Disease or Syndrome</dd></dl></div></div></div>
<div class="spaceAbove">Progressive myoclonic epilepsy-9 (EPM9) is an autosomal recessive disorder characterized by onset of myoclonic seizures between 6 and 7 years of age, with progression to falling and tonic-clonic seizures, severe action myoclonus, and neurologic decline. Diffuse muscle wasting and loss of subcutaneous fat are present (Damiano et al., 2015).&#13; For a discussion of genetic heterogeneity of progressive myoclonic epilepsy, see EPM1A (254800).</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/901242">Condition Record</a></div></div>
<div class="divPopper rprt" id="rdis_934612"><div><strong>Myofibrillar myopathy 8</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>934612</dd><dt><span class="dotprefix"></span>Concept ID: </dt><dd><a href="/medgen/docs/help/#sources" target="_blank" title="Concept Unique Identifier from NLM's Unified Medical Language system (UMLS)&#10;Click for more information.">C4310645</a></dd><dt><span class="dotprefix"></span></dt><dd>Disease or Syndrome</dd></dl></div></div></div>
<div class="spaceAbove">Myofibrillar myopathy-8 (MFM8) is an autosomal recessive myopathy characterized by slowly progressive proximal muscle weakness and atrophy affecting the upper and lower limbs, resulting in increased falls, gait problems, difficulty running or climbing stairs, and upper limb weakness or scapular winging. Some patients develop distal muscle weakness and atrophy. The phenotype may also be consistent with a clinical diagnosis of limb-girdle muscular dystrophy (LGMD). Age at symptom onset ranges from infancy to adulthood. Ambulation is generally preserved and cardiac involvement is rare, but respiratory compromise with decreased forced vital capacity often occurs. Muscle biopsy shows a mix of myopathic features, including myofibrillar inclusions and sarcomeric disorganization; some patients have been reported to have dystrophic changes on muscle biopsy (O'Grady et al., 2016; Daimaguler et al., 2021). There is significant phenotypic variation, even in patients with the same mutation, which must be taken into account when counseling affecting individuals (Woods et al., 2020).&#13; For a general phenotypic description and a discussion of genetic heterogeneity of myofibrillar myopathy, see MFM1 (601419).</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/934612">Condition Record</a></div></div>
<div class="divPopper rprt" id="rdis_934757"><div><strong>Charcot-Marie-Tooth disease axonal type 2CC</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>934757</dd><dt><span class="dotprefix"></span>Concept ID: </dt><dd><a href="/medgen/docs/help/#sources" target="_blank" title="Concept Unique Identifier from NLM's Unified Medical Language system (UMLS)&#10;Click for more information.">C4310790</a></dd><dt><span class="dotprefix"></span></dt><dd>Disease or Syndrome</dd></dl></div></div></div>
<div class="spaceAbove">Axonal Charcot-Marie-Tooth disease type 2CC is an autosomal dominant peripheral neuropathy that predominantly affects the lower limbs, resulting in muscle weakness and atrophy and gait impairment. Other features include distal sensory impairment and less severe involvement of the upper limbs. The age at onset and severity are variable (summary by Rebelo et al., 2016).&#13; For a phenotypic description and a discussion of genetic heterogeneity of axonal CMT type 2, see CMT2A (118210).</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/934757">Condition Record</a></div></div>
<div class="divPopper rprt" id="rdis_1392054"><div><strong>Intellectual disability, X-linked, syndromic, 35</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>1392054</dd><dt><span class="dotprefix"></span>Concept ID: </dt><dd><a href="/medgen/docs/help/#sources" target="_blank" title="Concept Unique Identifier from NLM's Unified Medical Language system (UMLS)&#10;Click for more information.">C4478383</a></dd><dt><span class="dotprefix"></span></dt><dd>Disease or Syndrome</dd></dl></div></div></div>
<div class="spaceAbove nowrap">See: <a href="/medgen/1392054">Condition Record</a></div></div>
<div class="divPopper rprt" id="rdis_1385580"><div><strong>Neurodevelopmental disorder with midbrain and hindbrain malformations</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>1385580</dd><dt><span class="dotprefix"></span>Concept ID: </dt><dd><a href="/medgen/docs/help/#sources" target="_blank" title="Concept Unique Identifier from NLM's Unified Medical Language system (UMLS)&#10;Click for more information.">C4479613</a></dd><dt><span class="dotprefix"></span></dt><dd>Disease or Syndrome</dd></dl></div></div></div>
<div class="spaceAbove">Neurodevelopmental disorder with midbrain and hindbrain malformations (NEDMHM) is an autosomal recessive disorder comprising impaired intellectual development, speech delay, mild microcephaly, and midbrain-hindbrain malformation (Ravindran et al., 2017).</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/1385580">Condition Record</a></div></div>
<div class="divPopper rprt" id="rdis_1611168"><div><strong>Spinocerebellar ataxia 44</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>1611168</dd><dt><span class="dotprefix"></span>Concept ID: </dt><dd><a href="/medgen/docs/help/#sources" target="_blank" title="Concept Unique Identifier from NLM's Unified Medical Language system (UMLS)&#10;Click for more information.">C4521563</a></dd><dt><span class="dotprefix"></span></dt><dd>Disease or Syndrome</dd></dl></div></div></div>
<div class="spaceAbove nowrap">See: <a href="/medgen/1611168">Condition Record</a></div></div>
<div class="divPopper rprt" id="rdis_1647581"><div><strong>Hyperekplexia 1</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>1647581</dd><dt><span class="dotprefix"></span>Concept ID: </dt><dd><a href="/medgen/docs/help/#sources" target="_blank" title="Concept Unique Identifier from NLM's Unified Medical Language system (UMLS)&#10;Click for more information.">C4551954</a></dd><dt><span class="dotprefix"></span></dt><dd>Disease or Syndrome</dd></dl></div></div></div>
<div class="spaceAbove">Hyperekplexia is an early-onset neurologic disorder characterized by an exaggerated startle response to sudden, unexpected auditory or tactile stimuli. Affected individuals have brief episodes of intense, generalized hypertonia in response to stimulation. Neonates may have prolonged periods of rigidity and are at risk for sudden death from apnea or aspiration. Many affected infants have inguinal hernias. The symptoms tend to resolve after infancy, but adults may have increased startle-induced falls and/or experience nocturnal muscle jerks (summary by Ryan et al., 1992).&#13; Genetic Heterogeneity of Hyperekplexia&#13; See also HKPX2 (614619), caused by mutation in the GLRB gene (138492) on chromosome 4q31; HKPX3 (614618), caused by mutation in the GLYT2 gene (SLC6A5; 604159) on chromosome 11p15; and HKPX4 (618011), caused by mutation in the ATAD1 gene (614452) on chromosome 10q23.&#13; Hyperekplexia can also occur in developmental and epileptic encephalopathy-8 (DEE8; 300607), caused by mutation in the ARHGEF9 gene (300429).&#13; See also sporadic stiff-man syndrome (184850) and the 'Jumping Frenchmen of Maine' (244100).</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/1647581">Condition Record</a></div></div>
<div class="divPopper rprt" id="rdis_1642424"><div><strong>Congenital myopathy with internal nuclei and atypical cores</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>1642424</dd><dt><span class="dotprefix"></span>Concept ID: </dt><dd><a href="/medgen/docs/help/#sources" target="_blank" title="Concept Unique Identifier from NLM's Unified Medical Language system (UMLS)&#10;Click for more information.">C4707232</a></dd><dt><span class="dotprefix"></span></dt><dd>Disease or Syndrome</dd></dl></div></div></div>
<div class="spaceAbove">Centronuclear myopathy is a condition characterized by muscle weakness (myopathy) and wasting (atrophy) in the skeletal muscles, which are the muscles used for movement. The severity of centronuclear myopathy varies among affected individuals, even among members of the same family.\n\nPeople with centronuclear myopathy begin experiencing muscle weakness at any time from birth to early adulthood. The muscle weakness slowly worsens over time and can lead to delayed development of motor skills, such as crawling or walking; muscle pain during exercise; and difficulty walking. Some affected individuals may need wheelchair assistance as the muscles atrophy and weakness becomes more severe. In rare instances, the muscle weakness improves over time.\n\nSome people with centronuclear myopathy experience mild to severe breathing problems related to the weakness of muscles needed for breathing. People with centronuclear myopathy may have droopy eyelids (ptosis) and weakness in other facial muscles, including the muscles that control eye movement. People with this condition may also have foot abnormalities, a high arch in the roof of the mouth (high-arched palate), and abnormal side-to-side curvature of the spine (scoliosis). Rarely, individuals with centronuclear myopathy have a weakened heart muscle (cardiomyopathy), disturbances in nerve function (neuropathy), or intellectual disability.\n\nA key feature of centronuclear myopathy is the displacement of the nucleus in muscle cells, which can be viewed under a microscope. Normally the nucleus is found at the edges of the rod-shaped muscle cells, but in people with centronuclear myopathy the nucleus is located in the center of these cells. How the change in location of the nucleus affects muscle cell function is unknown.</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/1642424">Condition Record</a></div></div>
<div class="divPopper rprt" id="rdis_1648474"><div><strong>Peroxisome biogenesis disorder 1A (Zellweger)</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>1648474</dd><dt><span class="dotprefix"></span>Concept ID: </dt><dd><a href="/medgen/docs/help/#sources" target="_blank" title="Concept Unique Identifier from NLM's Unified Medical Language system (UMLS)&#10;Click for more information.">C4721541</a></dd><dt><span class="dotprefix"></span></dt><dd>Disease or Syndrome</dd></dl></div></div></div>
<div class="spaceAbove">Zellweger spectrum disorder (ZSD) is a phenotypic continuum ranging from severe to mild. While individual phenotypes (e.g., Zellweger syndrome [ZS], neonatal adrenoleukodystrophy [NALD], and infantile Refsum disease [IRD]) were described in the past before the biochemical and molecular bases of this spectrum were fully determined, the term "ZSD" is now used to refer to all individuals with a defect in one of the ZSD-PEX genes regardless of phenotype. Individuals with ZSD usually come to clinical attention in the newborn period or later in childhood. Affected newborns are hypotonic and feed poorly. They have distinctive facies, congenital malformations (neuronal migration defects associated with neonatal-onset seizures, renal cysts, and bony stippling [chondrodysplasia punctata] of the patella[e] and the long bones), and liver disease that can be severe. Infants with severe ZSD are significantly impaired and typically die during the first year of life, usually having made no developmental progress. Individuals with intermediate/milder ZSD do not have congenital malformations, but rather progressive peroxisome dysfunction variably manifest as sensory loss (secondary to retinal dystrophy and sensorineural hearing loss), neurologic involvement (ataxia, polyneuropathy, and leukodystrophy), liver dysfunction, adrenal insufficiency, and renal oxalate stones. While hypotonia and developmental delays are typical, intellect can be normal. Some have osteopenia; almost all have ameleogenesis imperfecta in the secondary teeth.</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/1648474">Condition Record</a></div></div>
<div class="divPopper rprt" id="rdis_1648461"><div><strong>Charcot-Marie-Tooth disease type 5</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>1648461</dd><dt><span class="dotprefix"></span>Concept ID: </dt><dd><a href="/medgen/docs/help/#sources" target="_blank" title="Concept Unique Identifier from NLM's Unified Medical Language system (UMLS)&#10;Click for more information.">C4721916</a></dd><dt><span class="dotprefix"></span></dt><dd>Disease or Syndrome</dd></dl></div></div></div>
<div class="spaceAbove">Hereditary motor and sensory neuropathies (HMSN) are a heterogeneous group of peripheral nervous system disorders affecting motor and sensory function. HMSN I, also known as Charcot-Marie-Tooth (CMT) disease, or peroneal muscular atrophy, type 1, is a demyelinating neuropathy (see CMT1B; 118200) and HMSN II, also known as CMT type 2, is an axonal neuropathy (see CMT2A1; 118210). See also HMSN III (145900) and HMSN IV (266500).&#13; For an autosomal recessive disorder with similarities to HMSN V, see 607731.</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/1648461">Condition Record</a></div></div>
<div class="divPopper rprt" id="rdis_1648278"><div><strong>Mitochondrial complex 1 deficiency, nuclear type 12</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>1648278</dd><dt><span class="dotprefix"></span>Concept ID: </dt><dd><a href="/medgen/docs/help/#sources" target="_blank" title="Concept Unique Identifier from NLM's Unified Medical Language system (UMLS)&#10;Click for more information.">C4746984</a></dd><dt><span class="dotprefix"></span></dt><dd>Disease or Syndrome</dd></dl></div></div></div>
<div class="spaceAbove nowrap">See: <a href="/medgen/1648278">Condition Record</a></div></div>
<div class="divPopper rprt" id="rdis_1648392"><div><strong>Myasthenic syndrome, congenital, 23, presynaptic</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>1648392</dd><dt><span class="dotprefix"></span>Concept ID: </dt><dd><a href="/medgen/docs/help/#sources" target="_blank" title="Concept Unique Identifier from NLM's Unified Medical Language system (UMLS)&#10;Click for more information.">C4748678</a></dd><dt><span class="dotprefix"></span></dt><dd>Disease or Syndrome</dd></dl></div></div></div>
<div class="spaceAbove nowrap">See: <a href="/medgen/1648392">Condition Record</a></div></div>
<div class="divPopper rprt" id="rdis_1648290"><div><strong>Charcot-Marie-Tooth disease, demyelinating, type 1G</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>1648290</dd><dt><span class="dotprefix"></span>Concept ID: </dt><dd><a href="/medgen/docs/help/#sources" target="_blank" title="Concept Unique Identifier from NLM's Unified Medical Language system (UMLS)&#10;Click for more information.">C4748940</a></dd><dt><span class="dotprefix"></span></dt><dd>Disease or Syndrome</dd></dl></div></div></div>
<div class="spaceAbove">Charcot-Marie-Tooth disease type 1G is an autosomal dominant progressive peripheral sensorimotor neuropathy characterized by distal muscle weakness and atrophy with onset in the first or second decade. Affected individuals have difficulty walking, distal sensory impairment with decreased or absent reflexes, and often have foot deformities. Median motor nerve conduction velocities (NCV) are decreased (less than 38 m/s) and sural nerve biopsy shows myelin defects and onion bulb formation (summary by Hong et al., 2016 and Motley et al., 2016).&#13; For a phenotypic description and a discussion of genetic heterogeneity of autosomal dominant Charcot-Marie-Tooth disease type 1, see CMT1B (118200).</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/1648290">Condition Record</a></div></div>
<div class="divPopper rprt" id="rdis_1672866"><div><strong>Spinocerebellar ataxia, autosomal recessive 27</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>1672866</dd><dt><span class="dotprefix"></span>Concept ID: </dt><dd><a href="/medgen/docs/help/#sources" target="_blank" title="Concept Unique Identifier from NLM's Unified Medical Language system (UMLS)&#10;Click for more information.">C5193058</a></dd><dt><span class="dotprefix"></span></dt><dd>Disease or Syndrome</dd></dl></div></div></div>
<div class="spaceAbove">Autosomal recessive spinocerebellar ataxia-27 (SCAR27) is an adult-onset neurologic disorder characterized by gait difficulties and other cerebellar signs, such as eye movement abnormalities, dysarthria, and difficulty writing. The disorder is progressive, and some patients may lose independent ambulation. Additional features include spasticity of the lower limbs and cognitive impairment. Brain imaging shows cerebellar atrophy (summary by Eidhof et al., 2018).</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/1672866">Condition Record</a></div></div>
<div class="divPopper rprt" id="rdis_1681269"><div><strong>Metabolic crises, recurrent, with variable encephalomyopathic features and neurologic regression</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>1681269</dd><dt><span class="dotprefix"></span>Concept ID: </dt><dd><a href="/medgen/docs/help/#sources" target="_blank" title="Concept Unique Identifier from NLM's Unified Medical Language system (UMLS)&#10;Click for more information.">C5193083</a></dd><dt><span class="dotprefix"></span></dt><dd>Disease or Syndrome</dd></dl></div></div></div>
<div class="spaceAbove">Recurrent metabolic crises with variable encephalomyopathic features and neurologic regression (MECREN) is an autosomal recessive metabolic disorder with a highly variable phenotype. Most affected individuals present in the first years of life with episodic lactic acidosis associated with illness or stress, resulting in transient or permanent neurologic dysfunction. Some patients may recover, whereas others show subsequent variable developmental regression of motor and cognitive skills. Other features may include dystonia, hypotonia with inability to sit or walk, seizures, and abnormal signals in the basal ganglia. There is significant phenotypic heterogeneity, even among patients with the same mutation (summary by Almannai et al., 2018).</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/1681269">Condition Record</a></div></div>
<div class="divPopper rprt" id="rdis_1680026"><div><strong>Spastic ataxia 9, autosomal recessive</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>1680026</dd><dt><span class="dotprefix"></span>Concept ID: </dt><dd><a href="/medgen/docs/help/#sources" target="_blank" title="Concept Unique Identifier from NLM's Unified Medical Language system (UMLS)&#10;Click for more information.">C5193100</a></dd><dt><span class="dotprefix"></span></dt><dd>Disease or Syndrome</dd></dl></div></div></div>
<div class="spaceAbove nowrap">See: <a href="/medgen/1680026">Condition Record</a></div></div>
<div class="divPopper rprt" id="rdis_1716450"><div><strong>Neuropathy, hereditary sensory and autonomic, type 1A</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>1716450</dd><dt><span class="dotprefix"></span>Concept ID: </dt><dd><a href="/medgen/docs/help/#sources" target="_blank" title="Concept Unique Identifier from NLM's Unified Medical Language system (UMLS)&#10;Click for more information.">C5235211</a></dd><dt><span class="dotprefix"></span></dt><dd>Disease or Syndrome</dd></dl></div></div></div>
<div class="spaceAbove">SPTLC1-related hereditary sensory neuropathy (HSN) is an axonal form of hereditary motor and sensory neuropathy distinguished by prominent early sensory loss and later positive sensory phenomena including dysesthesia and characteristic "lightning" or "shooting" pains. Loss of sensation can lead to painless injuries, which, if unrecognized, result in slow wound healing and subsequent osteomyelitis requiring distal amputations. Motor involvement is present in all advanced cases and can be severe. After age 20 years, the distal wasting and weakness may involve proximal muscles, possibly leading to wheelchair dependency by the seventh or eighth decade. Sensorineural hearing loss is variable.</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/1716450">Condition Record</a></div></div>
<div class="divPopper rprt" id="rdis_1748867"><div><strong>Cardioencephalomyopathy, fatal infantile, due to cytochrome c oxidase deficiency 1</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>1748867</dd><dt><span class="dotprefix"></span>Concept ID: </dt><dd><a href="/medgen/docs/help/#sources" target="_blank" title="Concept Unique Identifier from NLM's Unified Medical Language system (UMLS)&#10;Click for more information.">C5399977</a></dd><dt><span class="dotprefix"></span></dt><dd>Disease or Syndrome</dd></dl></div></div></div>
<div class="spaceAbove">Mitochondrial complex IV deficiency nuclear type 2 (MC4DN2) is an autosomal recessive multisystem metabolic disorder characterized by the onset of symptoms at birth or in the first weeks or months of life. Affected individuals have severe hypotonia, often associated with feeding difficulties and respiratory insufficiency necessitating tube feeding and mechanical ventilation. The vast majority of patients develop hypertrophic cardiomyopathy in the first days or weeks of life, which usually leads to death in infancy or early childhood. Patients also show neurologic abnormalities, including developmental delay, nystagmus, fasciculations, dystonia, EEG changes, and brain imaging abnormalities compatible with a diagnosis of Leigh syndrome (see 256000). There may also be evidence of systemic involvement with hepatomegaly and myopathy, although neurogenic muscle atrophy is more common and may resemble spinal muscular atrophy type I (SMA1; 253300). Serum lactate is increased, and laboratory studies show decreased mitochondrial complex IV protein and activity levels in various tissues, including heart and skeletal muscle. Most patients die in infancy of cardiorespiratory failure (summary by Papadopoulou et al., 1999).&#13; For a discussion of genetic heterogeneity of mitochondrial complex IV (cytochrome c oxidase) deficiency, see 220110.</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/1748867">Condition Record</a></div></div>
<div class="divPopper rprt" id="rdis_1760275"><div><strong>Mitochondrial complex 4 deficiency, nuclear type 11</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>1760275</dd><dt><span class="dotprefix"></span>Concept ID: </dt><dd><a href="/medgen/docs/help/#sources" target="_blank" title="Concept Unique Identifier from NLM's Unified Medical Language system (UMLS)&#10;Click for more information.">C5436694</a></dd><dt><span class="dotprefix"></span></dt><dd>Disease or Syndrome</dd></dl></div></div></div>
<div class="spaceAbove">Mitochondrial complex IV deficiency nuclear type 11 (MC4DN11) is an autosomal recessive metabolic disorder characterized by a childhood-onset sensory neuronopathy and additional features which may include hypotonia, cerebellar ataxia, tremor, dystonia, choreoathetosis, and/or dysarthria. Patients may have variable motor delay, speech delay, or impaired intellectual development (summary by Doss et al., 2014; Otero et al., 2019; Xu et al., 2019; Dong et al., 2021).&#13; For a discussion of genetic heterogeneity of mitochondrial complex IV (cytochrome c oxidase) deficiency, see 220110.</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/1760275">Condition Record</a></div></div>
<div class="divPopper rprt" id="rdis_1760720"><div><strong>Neuronopathy, distal hereditary motor, type 5C</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>1760720</dd><dt><span class="dotprefix"></span>Concept ID: </dt><dd><a href="/medgen/docs/help/#sources" target="_blank" title="Concept Unique Identifier from NLM's Unified Medical Language system (UMLS)&#10;Click for more information.">C5436838</a></dd><dt><span class="dotprefix"></span></dt><dd>Disease or Syndrome</dd></dl></div></div></div>
<div class="spaceAbove">Autosomal dominant distal hereditary motor neuronopathy-13 (HMND13) is a neurologic disorder characterized by distal muscle weakness and atrophy affecting both the upper and lower limbs, resulting in difficulty walking and poor fine hand motor skills. Some patients show spasticity and hyperreflexia, mainly of the lower limbs: these features overlap with those observed in Silver syndrome, an allelic disorder. In addition, some patients with BSCL2 mutations show features of Charcot-Marie-Tooth type 2 (CMT2) with distal sensory impairment. HMND13, Silver syndrome (SPG17), and features of axonal sensorimotor peripheral neuropathy (CMT2) thus represent a phenotypic spectrum associated with heterozygous mutations in the BSCL2 gene. Individuals with the same mutation may manifest features consistent with any of those disorders; variability is even observed within the same family (summary by Van de Warrenburg et al., 2006; Luigetti et al., 2010; Choi et al., 2013).&#13; For a general phenotypic description and a discussion of genetic heterogeneity of distal HMN, see HMND1 (182960).</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/1760720">Condition Record</a></div></div>
<div class="divPopper rprt" id="rdis_1786836"><div><strong>Neuronopathy, distal hereditary motor, autosomal recessive 7</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>1786836</dd><dt><span class="dotprefix"></span>Concept ID: </dt><dd><a href="/medgen/docs/help/#sources" target="_blank" title="Concept Unique Identifier from NLM's Unified Medical Language system (UMLS)&#10;Click for more information.">C5543119</a></dd><dt><span class="dotprefix"></span></dt><dd>Disease or Syndrome</dd></dl></div></div></div>
<div class="spaceAbove">Autosomal recessive distal hereditary motor neuronopathy-7 (HMNR7) is characterized by onset of lower leg weakness in the first decade. Affected individuals have difficulty climbing stairs and problems standing on the heels. Some patients have later onset well into the adult years. Most patients have foot deformities, and some may have leg muscle atrophy. The disorder is slowly progressive and often involves the upper limbs. Muscle biopsy and electrophysiologic studies are consistent with both a myopathic process and an axonal motor neuropathy. Sensory abnormalities are not typically present, and patients remain ambulatory. The phenotype shows phenotypic overlap with distal hereditary motor neuropathy, but can distinguished by the presence of myopathic features (summary by Deschauer et al., 2021 and Pagnamenta et al., 2021).&#13; For a discussion of genetic heterogeneity of autosomal recessive HMN, see HMNR1 (604320).</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/1786836">Condition Record</a></div></div>
<div class="divPopper rprt" id="rdis_1794235"><div><strong>Spastic paraplegia 84, autosomal recessive</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>1794235</dd><dt><span class="dotprefix"></span>Concept ID: </dt><dd><a href="/medgen/docs/help/#sources" target="_blank" title="Concept Unique Identifier from NLM's Unified Medical Language system (UMLS)&#10;Click for more information.">C5562025</a></dd><dt><span class="dotprefix"></span></dt><dd>Disease or Syndrome</dd></dl></div></div></div>
<div class="spaceAbove">PI4KA-related disorder is a clinically variable disorder characterized primarily by neurologic dysfunction (limb spasticity, developmental delay, intellectual disability, seizures, ataxia, nystagmus), gastrointestinal manifestations (multiple intestinal atresia, inflammatory bowel disease), and combined immunodeficiency (leukopenia, variable immunoglobulin defects). Age of onset is typically antenatal or in early childhood; individuals can present with any combination of these features. Rare individuals present with later-onset hereditary spastic paraplegia. Brain MRI findings can include hypomyelinating leukodystrophy, cerebellar hypoplasia/atrophy, thin or dysplastic corpus callosum, and/or perisylvian polymicrogyria.</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/1794235">Condition Record</a></div></div>
<div class="divPopper rprt" id="rdis_1794246"><div><strong>Dyskinesia with orofacial involvement, autosomal recessive</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>1794246</dd><dt><span class="dotprefix"></span>Concept ID: </dt><dd><a href="/medgen/docs/help/#sources" target="_blank" title="Concept Unique Identifier from NLM's Unified Medical Language system (UMLS)&#10;Click for more information.">C5562036</a></dd><dt><span class="dotprefix"></span></dt><dd>Disease or Syndrome</dd></dl></div></div></div>
<div class="spaceAbove">Autosomal recessive dyskinesia with orofacial involvement (DSKOR) is characterized by the onset of abnormal involuntary movements, mainly affecting the limbs and causing walking difficulties, in the first decade. The severity is variable; some patients have orofacial dyskinesia resulting in speech difficulties, or develop neuropsychiatric features, including anxiety and social withdrawal. Cardiomyopathy has rarely been described and may be a manifestation of the disorder (summary by Bohlega et al., 2019).</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/1794246">Condition Record</a></div></div>
<div class="divPopper rprt" id="rdis_1798887"><div><strong>Infantile-onset generalized dyskinesia with orofacial involvement</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>1798887</dd><dt><span class="dotprefix"></span>Concept ID: </dt><dd><a href="/medgen/docs/help/#sources" target="_blank" title="Concept Unique Identifier from NLM's Unified Medical Language system (UMLS)&#10;Click for more information.">C5567464</a></dd><dt><span class="dotprefix"></span></dt><dd>Disease or Syndrome</dd></dl></div></div></div>
<div class="spaceAbove">Infantile-onset limb and orofacial dyskinesia is an autosomal recessive neurologic disorder characterized by delayed motor development and onset of a hyperkinetic movement disorder in the first year of life. The disorder results in impaired walking and orofacial dyskinesia with difficulty talking; the severity is variable (summary by Diggle et al., 2016).</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/1798887">Condition Record</a></div></div>
<div class="divPopper rprt" id="rdis_1800507"><div><strong>Acute infantile liver failure-cerebellar ataxia-peripheral sensory motor neuropathy syndrome</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>1800507</dd><dt><span class="dotprefix"></span>Concept ID: </dt><dd><a href="/medgen/docs/help/#sources" target="_blank" title="Concept Unique Identifier from NLM's Unified Medical Language system (UMLS)&#10;Click for more information.">C5569084</a></dd><dt><span class="dotprefix"></span></dt><dd>Disease or Syndrome</dd></dl></div></div></div>
<div class="spaceAbove">Autosomal recessive spinocerebellar ataxia-21 (SCAR21) is a neurologic disorder characterized by onset of cerebellar ataxia associated with cerebellar atrophy in early childhood. Affected individuals also have recurrent episodes of liver failure in the first decade, resulting in chronic liver fibrosis, as well as later onset of a peripheral neuropathy. Mild learning disabilities may also occur (summary by Schmidt et al., 2015).&#13; The phenotype is highly variable: all patients appear to have episodic and severe liver dysfunction in early childhood that tends to resolve with age. Affected individuals also show mild developmental or language delay and/or later onset of variable neurologic features, such as motor dysfunction (summary by Lenz et al., 2018).</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/1800507">Condition Record</a></div></div>
<div class="divPopper rprt" id="rdis_1811493"><div><strong>Charcot-Marie-Tooth disease, demyelinating, IIA 1I</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>1811493</dd><dt><span class="dotprefix"></span>Concept ID: </dt><dd><a href="/medgen/docs/help/#sources" target="_blank" title="Concept Unique Identifier from NLM's Unified Medical Language system (UMLS)&#10;Click for more information.">C5676914</a></dd><dt><span class="dotprefix"></span></dt><dd>Disease or Syndrome</dd></dl></div></div></div>
<div class="spaceAbove">Demyelinating Charcot-Marie-Tooth disease type 1I (CMT1I) is a neurologic disorder characterized predominantly by delayed motor development in the first years of life associated with gait abnormalities, sensory ataxia, hyporeflexia, and distal sensory impairment due to a sensorimotor peripheral neuropathy that mainly affects the lower limbs. The disorder is progressive, and some may have upper limb involvement. A subset of patients has central nervous system involvement that manifests as global developmental delay with impaired intellectual development and speech difficulties. Other features may include spasticity, hyperreflexia, tremor, dysmetria, seizures, or cerebellar findings. Brain imaging may be normal or show nonspecific abnormalities, such as white matter signal changes and delayed myelination (summary by Djordjevic et al., 2021).&#13; For a discussion of genetic heterogeneity of autosomal dominant Charcot-Marie-Tooth disease type 1, see CMT1B (118200).</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/1811493">Condition Record</a></div></div>
<div class="divPopper rprt" id="rdis_1807523"><div><strong>Intellectual developmental disorder with or without peripheral neuropathy</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>1807523</dd><dt><span class="dotprefix"></span>Concept ID: </dt><dd><a href="/medgen/docs/help/#sources" target="_blank" title="Concept Unique Identifier from NLM's Unified Medical Language system (UMLS)&#10;Click for more information.">C5676969</a></dd><dt><span class="dotprefix"></span></dt><dd>Disease or Syndrome</dd></dl></div></div></div>
<div class="spaceAbove">Intellectual developmental disorder with or without peripheral neuropathy (IDDPN) is an autosomal recessive neurologic disorder characterized by global developmental delay with mildly impaired intellectual development apparent from infancy or early childhood. Affected individuals have hypotonia and delayed walking with an unsteady gait and frequent falls. Some patients develop a progressive length-dependent sensorimotor peripheral neuropathy. Additional features may include dysarthria and subtle dysmorphic facial features (Diaz et al., 2020).</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/1807523">Condition Record</a></div></div>
<div class="divPopper rprt" id="rdis_1823969"><div><strong>Neurodevelopmental disorder with intention tremor, pyramidal signs, dyspraxia, and ocular anomalies</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>1823969</dd><dt><span class="dotprefix"></span>Concept ID: </dt><dd><a href="/medgen/docs/help/#sources" target="_blank" title="Concept Unique Identifier from NLM's Unified Medical Language system (UMLS)&#10;Click for more information.">C5774196</a></dd><dt><span class="dotprefix"></span></dt><dd>Disease or Syndrome</dd></dl></div></div></div>
<div class="spaceAbove">Neurodevelopmental disorder with intention tremor, pyramidal signs, dyspraxia, and ocular anomalies (NEDITPO) is an autosomal recessive multiple congenital anomaly syndrome characterized by mild to moderate intellectual disability, dysmorphic facial features, intention tremor, dyspraxia, and vertical strabismus (Rahikkala et al., 2022).</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/1823969">Condition Record</a></div></div>
<div class="divPopper rprt" id="rdis_1823974"><div><strong>Spinal muscular atrophy, distal, autosomal recessive, 6</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>1823974</dd><dt><span class="dotprefix"></span>Concept ID: </dt><dd><a href="/medgen/docs/help/#sources" target="_blank" title="Concept Unique Identifier from NLM's Unified Medical Language system (UMLS)&#10;Click for more information.">C5774201</a></dd><dt><span class="dotprefix"></span></dt><dd>Disease or Syndrome</dd></dl></div></div></div>
<div class="spaceAbove">Autosomal recessive distal hereditary motor neuronopathy-6 (HMNR6) is a neuromuscular disorder characterized by onset of distal muscle weakness in early infancy. Affected individuals often present at birth with distal joint contractures or foot deformities and show delayed motor development, often with inability to walk or frequent falls. Hypo- or hyperreflexia may be observed; limb muscle atrophy may also be present. Patients often show respiratory distress or diaphragmatic palsy. Electrophysiologic studies are consistent with a peripheral motor neuropathy without sensory involvement (Maroofian et al., 2019).&#13; For a discussion of genetic heterogeneity of autosomal recessive distal HMN, see HMNR1 (604320).</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/1823974">Condition Record</a></div></div>
<div class="divPopper rprt" id="rdis_1824000"><div><strong>Charcot-Marie-Tooth disease, axonal, IIa 2II</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>1824000</dd><dt><span class="dotprefix"></span>Concept ID: </dt><dd><a href="/medgen/docs/help/#sources" target="_blank" title="Concept Unique Identifier from NLM's Unified Medical Language system (UMLS)&#10;Click for more information.">C5774227</a></dd><dt><span class="dotprefix"></span></dt><dd>Disease or Syndrome</dd></dl></div></div></div>
<div class="spaceAbove">Axonal Charcot-Marie-Tooth disease type 2II (CMT2II) is an autosomal dominant neurologic disorder characterized by a slowly progressive sensorimotor peripheral neuropathy affecting mainly the lower limbs, resulting in distal muscle weakness and atrophy and subsequent walking difficulties. Some patients may have upper limb involvement with atrophy of the intrinsic hand muscles. The age at onset is highly variable, ranging from infancy to adulthood. Electrophysiologic studies are usually consistent with an axonal process, although some may show intermediate or even demyelinating values (Park et al., 2020; Ando et al., 2022). One family with possible autosomal recessive inheritance has been reported (Bogdanova-Mihaylova et al., 2021).&#13; For a discussion of genetic heterogeneity of axonal CMT, see CMT2A1 (118210).</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/1824000">Condition Record</a></div></div>
<div class="divPopper rprt" id="rdis_1824047"><div><strong>Muscular dystrophy, congenital, with or without seizures</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>1824047</dd><dt><span class="dotprefix"></span>Concept ID: </dt><dd><a href="/medgen/docs/help/#sources" target="_blank" title="Concept Unique Identifier from NLM's Unified Medical Language system (UMLS)&#10;Click for more information.">C5774274</a></dd><dt><span class="dotprefix"></span></dt><dd>Disease or Syndrome</dd></dl></div></div></div>
<div class="spaceAbove">Congenital muscular dystrophy with or without seizures (MYOS) is an autosomal recessive disorder characterized by severe muscle hypotonia apparent from birth, as well as developmental delay. Laboratory studies show increased serum creatine kinase and muscle biopsy shows nonspecific dystrophic features. Most patients develop seizures or have abnormal epileptiform findings on EEG studies; other variable findings may include feeding difficulties, nystagmus, myopathic facies, areflexia, and brain atrophy on MRI (summary by Larson et al., 2018 and Henige et al., 2021).</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/1824047">Condition Record</a></div></div>
<div class="divPopper rprt" id="rdis_1824070"><div><strong>Spinocerebellar ataxia, autosomal recessive 33</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>1824070</dd><dt><span class="dotprefix"></span>Concept ID: </dt><dd><a href="/medgen/docs/help/#sources" target="_blank" title="Concept Unique Identifier from NLM's Unified Medical Language system (UMLS)&#10;Click for more information.">C5774297</a></dd><dt><span class="dotprefix"></span></dt><dd>Disease or Syndrome</dd></dl></div></div></div>
<div class="spaceAbove">Autosomal recessive spinocerebellar ataxia-33 (SCAR33) is a neurologic disorder characterized by delayed motor development apparent in infancy, unsteady ataxic gait, intention tremor, nystagmus, and speech delay with dysarthria. Some patients have seizures and/or learning difficulties. Brain imaging shows cerebellar hypoplasia (Elsaid et al., 2017).</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/1824070">Condition Record</a></div></div>
<div class="divPopper rprt" id="rdis_1841029"><div><strong>Congenital myopathy 20</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>1841029</dd><dt><span class="dotprefix"></span>Concept ID: </dt><dd><a href="/medgen/docs/help/#sources" target="_blank" title="Concept Unique Identifier from NLM's Unified Medical Language system (UMLS)&#10;Click for more information.">C5830393</a></dd><dt><span class="dotprefix"></span></dt><dd>Disease or Syndrome</dd></dl></div></div></div>
<div class="spaceAbove">Congenital myopathy-20 (CMYO20) is an autosomal recessive neuromuscular disorder that shows wide phenotypic variability. Some patients present in early childhood with proximal muscle weakness affecting the lower and upper limbs resulting in difficulties running and climbing, whereas others present soon after birth with congenital limb or distal contractures. Additional features may include dysmorphic facial features and global developmental delay. Skeletal muscle biopsy may show nemaline rods (Nilipour et al., 2018; Pehlivan et al., 2019).&#13; For a discussion of genetic heterogeneity of congenital myopathy, see CMYO1A (117000).</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/1841029">Condition Record</a></div></div>
<div class="divPopper rprt" id="rdis_1841089"><div><strong>Congenital myopathy 22A, classic</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>1841089</dd><dt><span class="dotprefix"></span>Concept ID: </dt><dd><a href="/medgen/docs/help/#sources" target="_blank" title="Concept Unique Identifier from NLM's Unified Medical Language system (UMLS)&#10;Click for more information.">C5830453</a></dd><dt><span class="dotprefix"></span></dt><dd>Disease or Syndrome</dd></dl></div></div></div>
<div class="spaceAbove">Classic congenital myopathy-22A (CMYO22A) is an autosomal recessive muscle disorder characterized by onset of muscle weakness in utero or soon after birth. Early features may include fetal hypokinesia, breech presentation, and polyhydramnios. Affected individuals are born with severe hypotonia and require respiratory and feeding assistance. Those who survive the neonatal period show a 'classic' phenotype of congenital myopathy with delayed motor development, difficulty walking, proximal muscle weakness of the upper and lower limbs, facial and neck muscle weakness, easy fatigability, and mild limb contractures or foot deformities. Some have persistent respiratory insufficiency; dysmorphic facial features may be present (Zaharieva et al., 2016).&#13; For a discussion of genetic heterogeneity of congenital myopathy, see CMYO1A (117000).</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/1841089">Condition Record</a></div></div>
<div class="divPopper rprt" id="rdis_1841137"><div><strong>Congenital myopathy 22B, severe fetal</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>1841137</dd><dt><span class="dotprefix"></span>Concept ID: </dt><dd><a href="/medgen/docs/help/#sources" target="_blank" title="Concept Unique Identifier from NLM's Unified Medical Language system (UMLS)&#10;Click for more information.">C5830501</a></dd><dt><span class="dotprefix"></span></dt><dd>Disease or Syndrome</dd></dl></div></div></div>
<div class="spaceAbove">Severe fetal congenital myopathy-22B (CMYO22B) is an autosomal recessive muscle disorder characterized by in utero onset of severe muscle weakness manifest as fetal akinesia. The pregnancies are often complicated by polyhydramnios, and affected individuals develop fetal hydrops with pulmonary hypoplasia, severe joint contractures, and generalized muscle hypoplasia. Those who are born have respiratory failure resulting in death. Dysmorphic facial features may be present. The features in these patients overlap with fetal akinesia deformation sequence (FADS; see 208150) and lethal congenital contractures syndrome (LCCS; see 253310) (Zaharieva et al., 2016).&#13; For a discussion of genetic heterogeneity of congenital myopathy, see CMYO1A (117000).</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/1841137">Condition Record</a></div></div>
<div class="divPopper rprt" id="rdis_1849676"><div><strong>Neuronopathy, distal hereditary motor, autosomal dominant 11</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>1849676</dd><dt><span class="dotprefix"></span>Concept ID: </dt><dd><a href="/medgen/docs/help/#sources" target="_blank" title="Concept Unique Identifier from NLM's Unified Medical Language system (UMLS)&#10;Click for more information.">C5882697</a></dd><dt><span class="dotprefix"></span></dt><dd>Disease or Syndrome</dd></dl></div></div></div>
<div class="spaceAbove">Autosomal dominant distal hereditary motor neuronopathy-11 (HMND11) is a peripheral axonal motor neuropathy characterized by juvenile or young-adult onset of distal limb muscle weakness and atrophy mainly affecting the lower limbs, resulting in gait instability and walking difficulties. Foot deformities may also be present. The disorder is usually slowly progressive, and patients remain ambulatory until late adulthood. Some affected individuals may have distal upper limb and hand involvement or mild distal sensory abnormalities, but motor symptoms dominate the clinical picture. Electrophysiologic studies are consistent with a length-dependent axonal motor or sensorimotor neuropathy. Seizures are not present and brain imaging is normal (Beijer et al., 2019). One reported affected individual had a marfanoid habitus and mild speech delay with learning disabilities, suggesting possible expansion of the phenotypic spectrum (Ylikallio et al., 2020).&#13; For a discussion of genetic heterogeneity of autosomal dominant distal HMN, see HMND1 (182960).</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/1849676">Condition Record</a></div></div>
<div class="divPopper rprt" id="rdis_1856205"><div><strong>Neuronopathy, distal hereditary motor, autosomal recessive 11, with spasticity</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>1856205</dd><dt><span class="dotprefix"></span>Concept ID: </dt><dd><a href="/medgen/docs/help/#sources" target="_blank" title="Concept Unique Identifier from NLM's Unified Medical Language system (UMLS)&#10;Click for more information.">C5935630</a></dd><dt><span class="dotprefix"></span></dt><dd>Disease or Syndrome</dd></dl></div></div></div>
<div class="spaceAbove">Autosomal recessive distal hereditary motor neuropathy-11 with spasticity (HMNR11) is characterized by onset of slowly progressive distal muscle weakness and atrophy and spasticity of the lower limbs in the first decade of life. Affected individuals have difficulty walking, although ambulation is retained into adulthood. There is usually upper limb involvement. Some patients have foot deformities. Electrophysiologic studies are consistent with a length-dependent axonal motor neuropathy (Maroofian et al., 2024).&#13; For a discussion of genetic heterogeneity of autosomal recessive HMN, see HMNR1 (604320).</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/1856205">Condition Record</a></div></div>
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<div class="hangingIndent"><a title="click for more information" class="jig-ncbipopper" href="#rdis_342534" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Nemaline myopathy 2</a></div>
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<div class="hangingIndent"><a title="click for more information" class="jig-ncbipopper" href="#rdis_1385580" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Neurodevelopmental disorder with midbrain and hindbrain malformations</a></div>
<div class="hangingIndent"><a title="click for more information" class="jig-ncbipopper" href="#rdis_1849676" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Neuronopathy, distal hereditary motor, autosomal dominant 11</a></div>
<div class="hangingIndent"><a title="click for more information" class="jig-ncbipopper" href="#rdis_1856205" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Neuronopathy, distal hereditary motor, autosomal recessive 11, with spasticity</a></div>
<div class="hangingIndent"><a title="click for more information" class="jig-ncbipopper" href="#rdis_1786836" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Neuronopathy, distal hereditary motor, autosomal recessive 7</a></div>
<div class="hangingIndent"><a title="click for more information" class="jig-ncbipopper" href="#rdis_1760720" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Neuronopathy, distal hereditary motor, type 5C</a></div>
<div class="hangingIndent"><a title="click for more information" class="jig-ncbipopper" href="#rdis_1716450" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Neuropathy, hereditary sensory and autonomic, type 1A</a></div>
<div class="hangingIndent"><a title="click for more information" class="jig-ncbipopper" href="#rdis_413474" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Neuropathy, hereditary sensory and autonomic, type 2B</a></div>
<div class="hangingIndent"><a title="click for more information" class="jig-ncbipopper" href="#rdis_1648474" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Peroxisome biogenesis disorder 1A (Zellweger)</a></div>
<div class="hangingIndent"><a title="click for more information" class="jig-ncbipopper" href="#rdis_766874" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Peroxisome biogenesis disorder 8B</a></div>
<div class="hangingIndent"><a title="click for more information" class="jig-ncbipopper" href="#rdis_901242" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Progressive myoclonic epilepsy type 9</a></div>
<div class="hangingIndent"><a title="click for more information" class="jig-ncbipopper" href="#rdis_816615" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Proximal myopathy with extrapyramidal signs</a></div>
<div class="hangingIndent"><a title="click for more information" class="jig-ncbipopper" href="#rdis_375302" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Sensory ataxic neuropathy, dysarthria, and ophthalmoparesis</a></div>
<div class="hangingIndent"><a title="click for more information" class="jig-ncbipopper" href="#rdis_370750" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Spastic ataxia 2</a></div>
<div class="hangingIndent"><a title="click for more information" class="jig-ncbipopper" href="#rdis_1680026" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Spastic ataxia 9, autosomal recessive</a></div>
<div class="hangingIndent"><a title="click for more information" class="jig-ncbipopper" href="#rdis_1794235" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Spastic paraplegia 84, autosomal recessive</a></div>
<div class="hangingIndent"><a title="click for more information" class="jig-ncbipopper" href="#rdis_1823974" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Spinal muscular atrophy, distal, autosomal recessive, 6</a></div>
<div class="hangingIndent"><a title="click for more information" class="jig-ncbipopper" href="#rdis_371854" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Spinal muscular atrophy-progressive myoclonic epilepsy syndrome</a></div>
<div class="hangingIndent"><a title="click for more information" class="jig-ncbipopper" href="#rdis_1611168" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Spinocerebellar ataxia 44</a></div>
<div class="hangingIndent"><a title="click for more information" class="jig-ncbipopper" href="#rdis_855217" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Spinocerebellar ataxia type 37</a></div>
<div class="hangingIndent"><a title="click for more information" class="jig-ncbipopper" href="#rdis_148458" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Spinocerebellar ataxia type 6</a></div>
<div class="hangingIndent"><a title="click for more information" class="jig-ncbipopper" href="#rdis_1672866" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Spinocerebellar ataxia, autosomal recessive 27</a></div>
<div class="hangingIndent"><a title="click for more information" class="jig-ncbipopper" href="#rdis_1824070" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Spinocerebellar ataxia, autosomal recessive 33</a></div>
<div class="hangingIndent"><a title="click for more information" class="jig-ncbipopper" href="#rdis_39017" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Stiff-man syndrome</a></div>
<div class="hangingIndent"><a title="click for more information" class="jig-ncbipopper" href="#rdis_374113" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Striatonigral degeneration, infantile, mitochondrial</a></div></span></div></div>
</div>
<div class="portlet mgSection" id="ID_105">
<div class="portlet_head mgSectionHead ui-widget-header"><h1 class="nl" id="Professional_guidelines">Professional guidelines</h1><a sid="105" href="#" class="portlet_shutter" title="Show/hide content"></a></div>
<div class="portlet_content ln"><h3 class="subhead">PubMed<a class="help jig-ncbi-popper" data-jig="ncbipopper" href="#guidelinesHelpPM"><img class="pulldown" src="//static.pubmed.gov/portal/portal3rc.fcgi/4223267/img/4204968" /></a></h3>
<div class="nl"><a target="_blank" href="/pubmed/33385754">Disease course and treatment patterns in progressive supranuclear palsy: A real-world study.</a></div>
<div class="portlet_content ln"><span class="medgenPMauthor">Morgan JC,
Ye X,
Mellor JA,
Golden KJ,
Zamudio J,
Chiodo LA,
Bao Y,
Xie T</span><br />
<span class="medgenPMjournal">J Neurol Sci</span>
2021 Feb 15;421:117293.
Epub 2020 Dec 25
doi: 10.1016/j.jns.2020.117293.
<span class="bold">PMID: </span><a href="/pubmed/33385754" target="_blank">33385754</a></div>
<div class="nl"><a target="_blank" href="/pubmed/31418599">Treatment options for postural instability and gait difficulties in Parkinson's disease.</a></div>
<div class="portlet_content ln"><span class="medgenPMauthor">Müller MLTM,
Marusic U,
van Emde Boas M,
Weiss D,
Bohnen NI</span><br />
<span class="medgenPMjournal">Expert Rev Neurother</span>
2019 Dec;19(12):1229-1251.
Epub 2019 Aug 30
doi: 10.1080/14737175.2019.1656067.
<span class="bold">PMID: </span><a href="/pubmed/31418599" target="_blank">31418599</a></div>
<div class="nl"><a target="_blank" href="/pubmed/20107292">Primary care use of FRAX: absolute fracture risk assessment in postmenopausal women and older men.</a></div>
<div class="portlet_content ln"><span class="medgenPMauthor">Siris ES,
Baim S,
Nattiv A</span><br />
<span class="medgenPMjournal">Postgrad Med</span>
2010 Jan;122(1):82-90.
doi: 10.3810/pgm.2010.01.2102.
<span class="bold">PMID: </span><a href="/pubmed/20107292" target="_blank">20107292</a></div>
<div><a target="_blank" href="https://pubmed.ncbi.nlm.nih.gov/?term=(%22frequent%20falls%22%5Btiab%3A~0%5D)%20AND%20(%22english%20and%20humans%22%5BFilter%5D)%20AND%20(%20(%22practice%20guideline%22%5BFilter%5D)%20OR%20(practice*%5Btitl%5D%20AND%20(guideline%5Btitl%5D%20OR%20parameter%5Btitl%5D%20OR%20resource%5Btitl%5D%20OR%20bulletin%5Btitl%5D%20OR%20best%5Btitl%5D))%20OR%20(genetic*%5Btitl%5D%20AND%20(evaluation%5Btitl%5D%20OR%20counseling%5Btitl%5D%20OR%20screening%5Btitl%5D%20OR%20test*%5Btitl%5D))%20OR%20(clinical%5Btitl%5D%20AND%20((expert%5Btitl%5D%20AND%20consensus%5Btitl%5D)%20OR%20utility%5Btitl%5D%20OR%20guideline*%5Btitl%5D))%20OR%20(management%5Btitl%5D%20AND%20(clinical%5Btitl%5D%20OR%20diagnos*%5Btitl%5D%20OR%20recommendation%5Btitl%5D%20OR%20pain%5Btitl%5D%20OR%20surveillance%5Btitl%5D%20OR%20emergency%5Btitl%5D%20OR%20guideline*%5Btitl%5D%20OR%20therap*))%20OR%20(treatment%5Btitl%5D%20AND%20((evaluation%5Btitl%5D%20AND%20diagnosis%5Btitl%5D)%20OR%20(assessment%5Btitl%5D%20AND%20prevention%5Btitl%5D)%20OR%20therap*))%20OR%20(Diagnos*%5Btitl%5D%20AND%20(prenatal%5Btitl%5D%20OR%20treatment%5Btitl%5D%20OR%20follow-up%5Btitl%5D%20OR%20statement%5Btitl%5D%20OR%20criteria%5Btitl%5D%20OR%20newborn%5Btitl%5D%20OR%20differential%5Btitl%5D%20OR%20neonatal%5Btitl%5D%20OR%20neonate%5Btitl%5D))%20OR%20(guideline*%5Btitl%5D%20AND%20(pharmacogenetic*%5Btitl%5D%20OR%20recommendation%5Btitl%5D%20OR%20therap*%5Btitl%5D%20OR%20evidence-based%5Btitl%5D%20OR%20consensus%5Btitl%5D%20OR%20(technical%5Btitl%5D%20AND%20standard*%5Btitl%5D)%20OR%20(molecular%5Btitl%5D%20AND%20testing%5Btitl%5D)))%20OR%20(risk%5Btitl%5D%20AND%20assessment%5Btitl%5D)%20OR%20(recommendation*%5Btitl%5D%20AND%20(statement%5Btitl%5D%20OR%20Evidence-based%5Btitl%5D%20OR%20Consensus%5Btitl%5D))%20OR%20(care%20AND%20((Patient%5Btitl%5D%20AND%20standard*%5Btitl%5D)%20OR%20primary%5Btitl%5D%20OR%20psychosocial%5Btitl%5D))%20OR%20(Health%5Btitl%5D%20AND%20supervision%5Btitl%5D)%20OR%20(statement%5Btitl%5D%20AND%20(policy%5Btitl%5D%20OR%20position%5Btitl%5D%20OR%20Consensus%5Btitl%5D))%20OR%20(pharmacogenetics%5Btitl%5D%20AND%20(Dosing%5Btitl%5D%20OR%20therap*%5Btitl%5D%20OR%20genotype*%5Btitl%5D%20OR%20drug*%5Btitl%5D))%20OR%20(Chemotherapy%5Btitl%5D%20AND%20decision*%5Btitl%5D)%20OR%20(screening%5Btitl%5D%20AND%20(newborn%5Btitl%5D%20OR%20neonat*%5Btitl%5D%20OR%20detection%5Btitl%5D%20OR%20diagnos*%5Btitl%5D))%20OR%20(criteria%5Btitl%5D%20OR%20genotype*%5Btitl%5D)%20)%20NOT%20(%22Case%20reports%22%5BPublication%20type%5D%20OR%20%22clinical%20study%22%5BPublication%20Type%5D%20OR%20%22randomized%20controlled%20trial%22%5BPublication%20Type%5D)" title="PubMed search">See all (14)</a></div></div>
</div>
<div class="display-none help-popup" id="guidelinesHelpPM">These guidelines are articles in PubMed that match specific search criteria developed by MedGen to capture the most relevant practice guidelines. This list may not be comprehensive and may include broader topics as well. See the <a href="/medgen/docs/faq/" title="Frequently asked questions" target="_blank">FAQ</a> for details.</div><div class="display-none help-popup" id="guidelinesHelpCurated">These guidelines are manually curated by the MedGen team
to supplement articles available in PubMed. See the <a href="/medgen/docs/faq/" title="Frequently asked questions" target="_blank">FAQ</a> for details.</div>
<div class="portlet mgSection" id="ID_103">
<div class="portlet_head mgSectionHead ui-widget-header"><h1 class="nl" id="Recent_clinical_studies">Recent clinical studies</h1><a sid="103" href="#" class="portlet_shutter" title="Show/hide content"></a></div>
<div class="portlet_content ln"><h3 class="subhead">Etiology</h3>
<div class="nl"><a target="_blank" href="/pubmed/36753013">A woman with progressive motor and cognitive complaints.</a></div>
<div class="portlet_content ln"><span class="medgenPMauthor">Salavisa M,
Krupka D,
Serrazina F</span><br />
<span class="medgenPMjournal">Neurol Sci</span>
2023 Apr;44(4):1471-1473.
Epub 2023 Feb 8
doi: 10.1007/s10072-023-06666-3.
<span class="bold">PMID: </span><a href="/pubmed/36753013" target="_blank">36753013</a></div>
<div class="nl"><a target="_blank" href="/pubmed/31010491">Does integrated cognitive and balance (dual-task) training improve balance and reduce falls risk in individuals with cerebellar ataxia?</a></div>
<div class="portlet_content ln"><span class="medgenPMauthor">Winser S,
Pang MYC,
Rauszen JS,
Chan AYY,
Chen CH,
Whitney SL</span><br />
<span class="medgenPMjournal">Med Hypotheses</span>
2019 May;126:149-153.
Epub 2019 Mar 5
doi: 10.1016/j.mehy.2019.03.001.
<span class="bold">PMID: </span><a href="/pubmed/31010491" target="_blank">31010491</a></div>
<div class="nl"><a target="_blank" href="/pubmed/30033755">Rhythmic auditory stimulation for reduction of falls in Parkinson's disease: a randomized controlled study.</a></div>
<div class="portlet_content ln"><span class="medgenPMauthor">Thaut MH,
Rice RR,
Braun Janzen T,
Hurt-Thaut CP,
McIntosh GC</span><br />
<span class="medgenPMjournal">Clin Rehabil</span>
2019 Jan;33(1):34-43.
Epub 2018 Jul 23
doi: 10.1177/0269215518788615.
<span class="bold">PMID: </span><a href="/pubmed/30033755" target="_blank">30033755</a></div>
<div class="nl"><a target="_blank" href="/pubmed/25410216">Motor neuropathy.</a></div>
<div class="portlet_content ln"><span class="medgenPMauthor">Andersen H</span><br />
<span class="medgenPMjournal">Handb Clin Neurol</span>
2014;126:81-95.
doi: 10.1016/B978-0-444-53480-4.00007-2.
<span class="bold">PMID: </span><a href="/pubmed/25410216" target="_blank">25410216</a></div>
<div class="nl"><a target="_blank" href="/pubmed/17925191">Diabetes, fracture, and bone fragility.</a></div>
<div class="portlet_content ln"><span class="medgenPMauthor">Schwartz AV,
Sellmeyer DE</span><br />
<span class="medgenPMjournal">Curr Osteoporos Rep</span>
2007 Sep;5(3):105-11.
doi: 10.1007/s11914-007-0025-x.
<span class="bold">PMID: </span><a href="/pubmed/17925191" target="_blank">17925191</a></div>
<div><a target="_blank" href="https://pubmed.ncbi.nlm.nih.gov/?term=%22Frequent%20falls%22%20AND%20Etiology%2Fbroad%5Bfilter%5D%20%20AND%20%22english%20and%20humans%22%5Bfilter%5D%20NOT%20comment%5BPTYP%5D%20NOT%20letter%5BPTYP%5D" title="PubMed search">See all (162)</a></div><h3 class="subhead">Diagnosis</h3>
<div class="nl"><a target="_blank" href="/pubmed/36753013">A woman with progressive motor and cognitive complaints.</a></div>
<div class="portlet_content ln"><span class="medgenPMauthor">Salavisa M,
Krupka D,
Serrazina F</span><br />
<span class="medgenPMjournal">Neurol Sci</span>
2023 Apr;44(4):1471-1473.
Epub 2023 Feb 8
doi: 10.1007/s10072-023-06666-3.
<span class="bold">PMID: </span><a href="/pubmed/36753013" target="_blank">36753013</a></div>
<div class="nl"><a target="_blank" href="/pubmed/31377039">Boy with Dysarthria and Frequent Falls: A Treatable Disorder.</a></div>
<div class="portlet_content ln"><span class="medgenPMauthor">Sharawat IK,
Kurup A,
Sondhi V,
Saini L</span><br />
<span class="medgenPMjournal">J Pediatr</span>
2019 Dec;215:280-280.e1.
Epub 2019 Jul 31
doi: 10.1016/j.jpeds.2019.06.068.
<span class="bold">PMID: </span><a href="/pubmed/31377039" target="_blank">31377039</a></div>
<div class="nl"><a target="_blank" href="/pubmed/30033755">Rhythmic auditory stimulation for reduction of falls in Parkinson's disease: a randomized controlled study.</a></div>
<div class="portlet_content ln"><span class="medgenPMauthor">Thaut MH,
Rice RR,
Braun Janzen T,
Hurt-Thaut CP,
McIntosh GC</span><br />
<span class="medgenPMjournal">Clin Rehabil</span>
2019 Jan;33(1):34-43.
Epub 2018 Jul 23
doi: 10.1177/0269215518788615.
<span class="bold">PMID: </span><a href="/pubmed/30033755" target="_blank">30033755</a></div>
<div class="nl"><a target="_blank" href="/pubmed/25410216">Motor neuropathy.</a></div>
<div class="portlet_content ln"><span class="medgenPMauthor">Andersen H</span><br />
<span class="medgenPMjournal">Handb Clin Neurol</span>
2014;126:81-95.
doi: 10.1016/B978-0-444-53480-4.00007-2.
<span class="bold">PMID: </span><a href="/pubmed/25410216" target="_blank">25410216</a></div>
<div class="nl"><a target="_blank" href="/pubmed/899968">Progressive supranuclear palsy.</a></div>
<div class="portlet_content ln"><span class="medgenPMauthor">Dalziel JA,
Griffiths RA</span><br />
<span class="medgenPMjournal">Age Ageing</span>
1977 Aug;6(3):185-91.
doi: 10.1093/ageing/6.3.185.
<span class="bold">PMID: </span><a href="/pubmed/899968" target="_blank">899968</a></div>
<div><a target="_blank" href="https://pubmed.ncbi.nlm.nih.gov/?term=%22Frequent%20falls%22%20AND%20Diagnosis%2Fbroad%5Bfilter%5D%20%20AND%20%22english%20and%20humans%22%5Bfilter%5D%20NOT%20comment%5BPTYP%5D%20NOT%20letter%5BPTYP%5D" title="PubMed search">See all (169)</a></div><h3 class="subhead">Therapy</h3>
<div class="nl"><a target="_blank" href="/pubmed/31010491">Does integrated cognitive and balance (dual-task) training improve balance and reduce falls risk in individuals with cerebellar ataxia?</a></div>
<div class="portlet_content ln"><span class="medgenPMauthor">Winser S,
Pang MYC,
Rauszen JS,
Chan AYY,
Chen CH,
Whitney SL</span><br />
<span class="medgenPMjournal">Med Hypotheses</span>
2019 May;126:149-153.
Epub 2019 Mar 5
doi: 10.1016/j.mehy.2019.03.001.
<span class="bold">PMID: </span><a href="/pubmed/31010491" target="_blank">31010491</a></div>
<div class="nl"><a target="_blank" href="/pubmed/30033755">Rhythmic auditory stimulation for reduction of falls in Parkinson's disease: a randomized controlled study.</a></div>
<div class="portlet_content ln"><span class="medgenPMauthor">Thaut MH,
Rice RR,
Braun Janzen T,
Hurt-Thaut CP,
McIntosh GC</span><br />
<span class="medgenPMjournal">Clin Rehabil</span>
2019 Jan;33(1):34-43.
Epub 2018 Jul 23
doi: 10.1177/0269215518788615.
<span class="bold">PMID: </span><a href="/pubmed/30033755" target="_blank">30033755</a></div>
<div class="nl"><a target="_blank" href="/pubmed/29415360">Metformin-induced encephalopathy: the role of thiamine.</a></div>
<div class="portlet_content ln"><span class="medgenPMauthor">McGarvey C,
Franconi C,
Prentice D,
Bynevelt M</span><br />
<span class="medgenPMjournal">Intern Med J</span>
2018 Feb;48(2):194-197.
doi: 10.1111/imj.13693.
<span class="bold">PMID: </span><a href="/pubmed/29415360" target="_blank">29415360</a></div>
<div class="nl"><a target="_blank" href="/pubmed/15189108">Tardive dyskinesia rates with atypical antipsychotics in older adults.</a></div>
<div class="portlet_content ln"><span class="medgenPMauthor">Jeste DV</span><br />
<span class="medgenPMjournal">J Clin Psychiatry</span>
2004;65 Suppl 9:21-4.
<span class="bold">PMID: </span><a href="/pubmed/15189108" target="_blank">15189108</a></div>
<div class="nl"><a target="_blank" href="/pubmed/12365318">Congenital familial hypertonia.</a></div>
<div class="portlet_content ln"><span class="medgenPMauthor">DeLuca CF,
Cashore WJ</span><br />
<span class="medgenPMjournal">Clin Pediatr (Phila)</span>
2002 Sep;41(7):529-32.
doi: 10.1177/000992280204100713.
<span class="bold">PMID: </span><a href="/pubmed/12365318" target="_blank">12365318</a></div>
<div><a target="_blank" href="https://pubmed.ncbi.nlm.nih.gov/?term=%22Frequent%20falls%22%20AND%20Therapy%2Fbroad%5Bfilter%5D%20%20AND%20%22english%20and%20humans%22%5Bfilter%5D%20NOT%20comment%5BPTYP%5D%20NOT%20letter%5BPTYP%5D" title="PubMed search">See all (87)</a></div><h3 class="subhead">Prognosis</h3>
<div class="nl"><a target="_blank" href="/pubmed/26027505">Epidemiology of fractures in type 2 diabetes.</a></div>
<div class="portlet_content ln"><span class="medgenPMauthor">Schwartz AV</span><br />
<span class="medgenPMjournal">Bone</span>
2016 Jan;82:2-8.
Epub 2015 May 29
doi: 10.1016/j.bone.2015.05.032.
<span class="bold">PMID: </span><a href="/pubmed/26027505" target="_blank">26027505</a></div>
<div class="nl"><a target="_blank" href="/pubmed/22744727">Is there an increased risk of hip fracture in Parkinson's disease? A nationwide inpatient sample.</a></div>
<div class="portlet_content ln"><span class="medgenPMauthor">Bhattacharya RK,
Dubinsky RM,
Lai SM,
Dubinsky H</span><br />
<span class="medgenPMjournal">Mov Disord</span>
2012 Sep 15;27(11):1440-3.
Epub 2012 Jun 28
doi: 10.1002/mds.25073.
<span class="bold">PMID: </span><a href="/pubmed/22744727" target="_blank">22744727</a></div>
<div class="nl"><a target="_blank" href="/pubmed/20086288">Strategies for treatment of gait and posture associated deficits in movement disorders: the impact of deep brain stimulation.</a></div>
<div class="portlet_content ln"><span class="medgenPMauthor">Bötzel K,
Kraft E</span><br />
<span class="medgenPMjournal">Restor Neurol Neurosci</span>
2010;28(1):115-22.
doi: 10.3233/RNN-2010-0532.
<span class="bold">PMID: </span><a href="/pubmed/20086288" target="_blank">20086288</a></div>
<div class="nl"><a target="_blank" href="/pubmed/17410828">Falls--where do we stand?</a></div>
<div class="portlet_content ln"><span class="medgenPMauthor">Morley JE</span><br />
<span class="medgenPMjournal">Mo Med</span>
2007 Jan-Feb;104(1):63-7.
<span class="bold">PMID: </span><a href="/pubmed/17410828" target="_blank">17410828</a></div>
<div class="nl"><a target="_blank" href="/pubmed/15189108">Tardive dyskinesia rates with atypical antipsychotics in older adults.</a></div>
<div class="portlet_content ln"><span class="medgenPMauthor">Jeste DV</span><br />
<span class="medgenPMjournal">J Clin Psychiatry</span>
2004;65 Suppl 9:21-4.
<span class="bold">PMID: </span><a href="/pubmed/15189108" target="_blank">15189108</a></div>
<div><a target="_blank" href="https://pubmed.ncbi.nlm.nih.gov/?term=%22Frequent%20falls%22%20AND%20Prognosis%2Fbroad%5Bfilter%5D%20%20AND%20%22english%20and%20humans%22%5Bfilter%5D%20NOT%20comment%5BPTYP%5D%20NOT%20letter%5BPTYP%5D" title="PubMed search">See all (91)</a></div><h3 class="subhead">Clinical prediction guides</h3>
<div class="nl"><a target="_blank" href="/pubmed/38385661">Negative Myoclonus: Neurophysiological Study and Clinical Impact in Progressive Myoclonus Ataxia.</a></div>
<div class="portlet_content ln"><span class="medgenPMauthor">Pollini L,
van der Veen S,
Elting JWJ,
Tijssen MAJ</span><br />
<span class="medgenPMjournal">Mov Disord</span>
2024 Apr;39(4):674-683.
Epub 2024 Feb 22
doi: 10.1002/mds.29741.
<span class="bold">PMID: </span><a href="/pubmed/38385661" target="_blank">38385661</a></div>
<div class="nl"><a target="_blank" href="/pubmed/38301322">A Retrospective Review of 18 Patients With Childhood-Onset Hereditary Spastic Paraplegia, Nine With Novel Variants.</a></div>
<div class="portlet_content ln"><span class="medgenPMauthor">Kilic MA,
Yildiz EP,
Deniz A,
Coskun O,
Kurekci F,
Avci R,
Genc HM,
Yesil G,
Akbas S,
Yesilyurt A,
Kara B</span><br />
<span class="medgenPMjournal">Pediatr Neurol</span>
2024 Mar;152:189-195.
Epub 2024 Jan 6
doi: 10.1016/j.pediatrneurol.2024.01.005.
<span class="bold">PMID: </span><a href="/pubmed/38301322" target="_blank">38301322</a></div>
<div class="nl"><a target="_blank" href="/pubmed/33407830">Muscle spindle function in healthy and diseased muscle.</a></div>
<div class="portlet_content ln"><span class="medgenPMauthor">Kröger S,
Watkins B</span><br />
<span class="medgenPMjournal">Skelet Muscle</span>
2021 Jan 7;11(1):3.
doi: 10.1186/s13395-020-00258-x.
<span class="bold">PMID: </span><a href="/pubmed/33407830" target="_blank">33407830</a><a href="/pmc/articles/PMC7788844" target="_blank" class="PubMedFree">Free PMC Article</a></div>
<div class="nl"><a target="_blank" href="/pubmed/30477055">Hyponatremia in ICU.</a></div>
<div class="portlet_content ln"><span class="medgenPMauthor">Pillai KS,
Trivedi TH,
Moulick ND</span><br />
<span class="medgenPMjournal">J Assoc Physicians India</span>
2018 May;66(5):48-52.
<span class="bold">PMID: </span><a href="/pubmed/30477055" target="_blank">30477055</a></div>
<div class="nl"><a target="_blank" href="/pubmed/22744727">Is there an increased risk of hip fracture in Parkinson's disease? A nationwide inpatient sample.</a></div>
<div class="portlet_content ln"><span class="medgenPMauthor">Bhattacharya RK,
Dubinsky RM,
Lai SM,
Dubinsky H</span><br />
<span class="medgenPMjournal">Mov Disord</span>
2012 Sep 15;27(11):1440-3.
Epub 2012 Jun 28
doi: 10.1002/mds.25073.
<span class="bold">PMID: </span><a href="/pubmed/22744727" target="_blank">22744727</a></div>
<div><a target="_blank" href="https://pubmed.ncbi.nlm.nih.gov/?term=%22Frequent%20falls%22%20AND%20Clinical%20prediction%20guides%2Fbroad%5Bfilter%5D%20%20AND%20%22english%20and%20humans%22%5Bfilter%5D%20NOT%20comment%5BPTYP%5D%20NOT%20letter%5BPTYP%5D" title="PubMed search">See all (119)</a></div></div>
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<div class="nl"><a target="_blank" href="/pubmed/39591229">Botulinum Toxin Effects on Freezing of Gait in Parkinson's Disease: A Systematic Review.</a></div>
<div class="portlet_content ln"><span class="medgenPMauthor">Tambasco N,
Nigro P,
Mechelli A,
Duranti M,
Parnetti L</span><br />
<span class="medgenPMjournal">Toxins (Basel)</span>
2024 Nov 3;16(11)
doi: 10.3390/toxins16110474.
<span class="bold">PMID: </span><a href="/pubmed/39591229" target="_blank">39591229</a><a href="/pmc/articles/PMC11598804" target="_blank" class="PubMedFree">Free PMC Article</a></div>
<div class="nl"><a target="_blank" href="/pubmed/33947733">Predicting falls in community-dwelling older adults: a systematic review of prognostic models.</a></div>
<div class="portlet_content ln"><span class="medgenPMauthor">Gade GV,
Jørgensen MG,
Ryg J,
Riis J,
Thomsen K,
Masud T,
Andersen S</span><br />
<span class="medgenPMjournal">BMJ Open</span>
2021 May 4;11(5):e044170.
doi: 10.1136/bmjopen-2020-044170.
<span class="bold">PMID: </span><a href="/pubmed/33947733" target="_blank">33947733</a><a href="/pmc/articles/PMC8098967" target="_blank" class="PubMedFree">Free PMC Article</a></div>
<div class="nl"><a target="_blank" href="/pubmed/25808937">Physical therapy management for balance deficits in children with hearing impairments: A systematic review.</a></div>
<div class="portlet_content ln"><span class="medgenPMauthor">Fernandes R,
Hariprasad S,
Kumar VK</span><br />
<span class="medgenPMjournal">J Paediatr Child Health</span>
2015 Aug;51(8):753-8.
Epub 2015 Mar 25
doi: 10.1111/jpc.12867.
<span class="bold">PMID: </span><a href="/pubmed/25808937" target="_blank">25808937</a></div>
<div class="nl"><a target="_blank" href="/pubmed/25575953">Aggression in Huntington's disease: a systematic review of rates of aggression and treatment methods.</a></div>
<div class="portlet_content ln"><span class="medgenPMauthor">Fisher CA,
Sewell K,
Brown A,
Churchyard A</span><br />
<span class="medgenPMjournal">J Huntingtons Dis</span>
2014;3(4):319-32.
doi: 10.3233/JHD-140127.
<span class="bold">PMID: </span><a href="/pubmed/25575953" target="_blank">25575953</a></div>
<div><a target="_blank" href="https://pubmed.ncbi.nlm.nih.gov/?term=%22Frequent%20falls%22%20AND%20systematic%5Bsb%5D%20AND%20%22english%20and%20humans%22%5Bfilter%5D%20NOT%20comment%5BPTYP%5D%20NOT%20letter%5BPTYP%5D" title="PubMed search">See all (4)</a></div></div>
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<div class="portlet_content ln"><ul><li><a href="/gtr/tests?term=C0850703%5bDISCUI%5d&amp;filter=method%3A2%5F8" target="_blank">Deletion/duplication analysis (6)</a></li>
<li><a href="/gtr/tests?term=C0850703%5bDISCUI%5d&amp;filter=method%3A2%5F7" target="_blank">Sequence analysis of the entire coding region (6)</a></li>
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