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<span>Genetic Conditions: I</span>
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<h1>Genetic Conditions: I</h1>
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<p>Explore the signs and symptoms, genetic cause, and inheritance pattern of various health conditions.</p>
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<span class='blue-label'>Other genetic conditions A-Z</span>
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<ul class="alpha-links">
<li><a href="https://medlineplus.gov/genetics/condition-0/" data-alpha="0-9">0-9</a></li>
<li><a href="https://medlineplus.gov/genetics/condition/" data-alpha="A">A</a></li>
<li><a href="https://medlineplus.gov/genetics/condition-b/" data-alpha="B">B</a></li>
<li><a href="https://medlineplus.gov/genetics/condition-c/" data-alpha="C">C</a></li>
<li><a href="https://medlineplus.gov/genetics/condition-d/" data-alpha="D">D</a></li>
<li><a href="https://medlineplus.gov/genetics/condition-e/" data-alpha="E">E</a></li>
<li><a href="https://medlineplus.gov/genetics/condition-f/" data-alpha="F">F</a></li>
<li><a href="https://medlineplus.gov/genetics/condition-g/" data-alpha="G">G</a></li>
<li><a href="https://medlineplus.gov/genetics/condition-h/" data-alpha="H">H</a></li>
<li><span class="active">I</span></li>
<li><a href="https://medlineplus.gov/genetics/condition-j/" data-alpha="J">J</a></li>
<li><a href="https://medlineplus.gov/genetics/condition-k/" data-alpha="K">K</a></li>
<li><a href="https://medlineplus.gov/genetics/condition-l/" data-alpha="L">L</a></li>
<li><a href="https://medlineplus.gov/genetics/condition-m/" data-alpha="M">M</a></li>
<li><a href="https://medlineplus.gov/genetics/condition-n/" data-alpha="N">N</a></li>
<li><a href="https://medlineplus.gov/genetics/condition-o/" data-alpha="O">O</a></li>
<li><a href="https://medlineplus.gov/genetics/condition-p/" data-alpha="P">P</a></li>
<li><a href="https://medlineplus.gov/genetics/condition-q/" data-alpha="Q">Q</a></li>
<li><a href="https://medlineplus.gov/genetics/condition-r/" data-alpha="R">R</a></li>
<li><a href="https://medlineplus.gov/genetics/condition-s/" data-alpha="S">S</a></li>
<li><a href="https://medlineplus.gov/genetics/condition-t/" data-alpha="T">T</a></li>
<li><a href="https://medlineplus.gov/genetics/condition-u/" data-alpha="U">U</a></li>
<li><a href="https://medlineplus.gov/genetics/condition-v/" data-alpha="V">V</a></li>
<li><a href="https://medlineplus.gov/genetics/condition-w/" data-alpha="W">W</a></li>
<li><a href="https://medlineplus.gov/genetics/condition-x/" data-alpha="X">X</a></li>
<li><a href="https://medlineplus.gov/genetics/condition-y/" data-alpha="Y">Y</a></li>
<li><a href="https://medlineplus.gov/genetics/condition-z/" data-alpha="Z">Z</a></li>
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<section>
<ul class="withident breaklist">
<li>I-cell disease, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/mucolipidosis-ii-alpha-beta/">Mucolipidosis II alpha/beta</a></li>
<li>I2S deficiency, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/mucopolysaccharidosis-type-ii/">Mucopolysaccharidosis type II</a></li>
<li>IAHSP, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/infantile-onset-ascending-hereditary-spastic-paralysis/">Infantile-onset ascending hereditary spastic paralysis</a></li>
<li>IBD deficiency, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/isobutyryl-coa-dehydrogenase-deficiency/">Isobutyryl-CoA dehydrogenase deficiency</a></li>
<li>IBIDS, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/trichothiodystrophy/">Trichothiodystrophy</a></li>
<li>IBM2, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/gne-myopathy/">GNE myopathy</a></li>
<li>IBMPFD, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/inclusion-body-myopathy-with-early-onset-paget-disease-and-frontotemporal-dementia/">Inclusion body myopathy with early-onset Paget disease and frontotemporal dementia</a></li>
<li>ICAS, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/isolated-congenital-asplenia/">Isolated congenital asplenia</a></li>
<li>Ichthyoses, lamellar, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/lamellar-ichthyosis/">Lamellar ichthyosis</a></li>
<li>Ichthyosiform erythroderma with hypotrichosis and hyper-IgE, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/netherton-syndrome/">Netherton syndrome</a></li>
<li>Ichthyosiform Erythroderma with Leukocyte Vacuolation, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/chanarin-dorfman-syndrome/">Chanarin-Dorfman syndrome</a></li>
<li>Ichthyosiform erythroderma, corneal involvement, and deafness, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/keratitis-ichthyosis-deafness-syndrome/">Keratitis-ichthyosis-deafness syndrome</a></li>
<li>Ichthyosiform erythroderma, unilateral, with ipsilateral malformations, especially absence deformity of limbs, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/child-syndrome/">CHILD syndrome</a></li>
<li>Ichthyosis congenita, harlequin fetus type, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/harlequin-ichthyosis/">Harlequin ichthyosis</a></li>
<li>Ichthyosis linearis circumflexa, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/netherton-syndrome/">Netherton syndrome</a></li>
<li>Ichthyosis oligophrenia syndrome, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/sjogren-larsson-syndrome/">Sjögren-Larsson syndrome</a></li>
<li>Ichthyosis variegata, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/ichthyosis-with-confetti/">Ichthyosis with confetti</a></li>
<li><a href="https://medlineplus.gov/genetics/condition/ichthyosis-with-confetti/">Ichthyosis with confetti</a></li>
<li>Ichthyosis, hystrix-like, with deafness, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/hystrix-like-ichthyosis-with-deafness/">Hystrix-like ichthyosis with deafness</a></li>
<li>Ichthyosis, lamellar, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/lamellar-ichthyosis/">Lamellar ichthyosis</a></li>
<li>Ichthyotic neutral lipid storage disease, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/chanarin-dorfman-syndrome/">Chanarin-Dorfman syndrome</a></li>
<li>IDD, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/intervertebral-disc-disease/">Intervertebral disc disease</a></li>
<li>IDDM, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/type-1-diabetes/">Type 1 diabetes</a></li>
<li>IDDM-secretory diarrhea syndrome, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/immune-dysregulation-polyendocrinopathy-enteropathy-x-linked-syndrome/">Immune dysregulation, polyendocrinopathy, enteropathy, X-linked syndrome</a></li>
<li>IDDMSF, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/snijders-blok-campeau-syndrome/">Snijders Blok-Campeau syndrome</a></li>
<li>Idic(15), <i>see</i> <a href="https://medlineplus.gov/genetics/condition/15q11-q13-duplication-syndrome/">15q11-q13 duplication syndrome</a></li>
<li>Idiopathic fibrosing alveolitis, chronic form, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/idiopathic-pulmonary-fibrosis/">Idiopathic pulmonary fibrosis</a></li>
<li>Idiopathic hyperCKemia, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/isolated-hyperckemia/">Isolated hyperCKemia</a></li>
<li>Idiopathic hyperphosphatasia, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/juvenile-paget-disease/">Juvenile Paget disease</a></li>
<li>Idiopathic hypertrophic subaortic stenosis, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/familial-hypertrophic-cardiomyopathy/">Familial hypertrophic cardiomyopathy</a></li>
<li>Idiopathic infantile arterial calcification, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/generalized-arterial-calcification-of-infancy/">Generalized arterial calcification of infancy</a></li>
<li><a href="https://medlineplus.gov/genetics/condition/idiopathic-infantile-hypercalcemia/">Idiopathic infantile hypercalcemia</a></li>
<li>Idiopathic infantile nystagmus, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/x-linked-infantile-nystagmus/">X-linked infantile nystagmus</a></li>
<li>Idiopathic inflammatory myopathies, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/idiopathic-inflammatory-myopathy/">Idiopathic inflammatory myopathy</a></li>
<li><a href="https://medlineplus.gov/genetics/condition/idiopathic-inflammatory-myopathy/">Idiopathic inflammatory myopathy</a></li>
<li>Idiopathic inflammatory myositis, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/idiopathic-inflammatory-myopathy/">Idiopathic inflammatory myopathy</a></li>
<li>Idiopathic juvenile osteoporosis, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/juvenile-primary-osteoporosis/">Juvenile primary osteoporosis</a></li>
<li>Idiopathic myelofibrosis, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/primary-myelofibrosis/">Primary myelofibrosis</a></li>
<li>Idiopathic obliterative arteriopathy, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/generalized-arterial-calcification-of-infancy/">Generalized arterial calcification of infancy</a></li>
<li>Idiopathic persistent elevation of serum creatine kinase, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/isolated-hyperckemia/">Isolated hyperCKemia</a></li>
<li>Idiopathic proctocolitis, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/ulcerative-colitis/">Ulcerative colitis</a></li>
<li><a href="https://medlineplus.gov/genetics/condition/idiopathic-pulmonary-fibrosis/">Idiopathic pulmonary fibrosis</a></li>
<li>Idiopathic pulmonary hypertension, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/pulmonary-arterial-hypertension/">Pulmonary arterial hypertension</a></li>
<li>Idiopathic thrombocytopenic purpura, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/immune-thrombocytopenia/">Immune thrombocytopenia</a></li>
<li>Idiopathic torsion dystonia of mixed type, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/dystonia-6/">Dystonia 6</a></li>
<li>Idiopathic ventricular fibrillation, Brugada type, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/brugada-syndrome/">Brugada syndrome</a></li>
<li>IDUA deficiency, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/mucopolysaccharidosis-type-i/">Mucopolysaccharidosis type I</a></li>
<li>Iduronate 2-sulfatase deficiency, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/mucopolysaccharidosis-type-ii/">Mucopolysaccharidosis type II</a></li>
<li>IFIH1 deficiency, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/mda5-deficiency/">MDA5 deficiency</a></li>
<li>IHPRF2, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/unc80-deficiency/">UNC80 deficiency</a></li>
<li>IIAC, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/generalized-arterial-calcification-of-infancy/">Generalized arterial calcification of infancy</a></li>
<li>IIAE3, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/acute-necrotizing-encephalopathy-type-1/">Acute necrotizing encephalopathy type 1</a></li>
<li>IIH, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/idiopathic-infantile-hypercalcemia/">Idiopathic infantile hypercalcemia</a></li>
<li>IL2RG SCID, T- B+ NK-, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/x-linked-severe-combined-immunodeficiency/">X-linked severe combined immunodeficiency</a></li>
<li>ILC, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/netherton-syndrome/">Netherton syndrome</a></li>
<li>ILS, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/isolated-lissencephaly-sequence/">Isolated lissencephaly sequence</a></li>
<li>IMAGe anomaly, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/intrauterine-growth-restriction-metaphyseal-dysplasia-adrenal-hypoplasia-congenita-and-genital-anomalies/">Intrauterine growth restriction, metaphyseal dysplasia, adrenal hypoplasia congenita, and genital anomalies</a></li>
<li>IMAGe association, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/intrauterine-growth-restriction-metaphyseal-dysplasia-adrenal-hypoplasia-congenita-and-genital-anomalies/">Intrauterine growth restriction, metaphyseal dysplasia, adrenal hypoplasia congenita, and genital anomalies</a></li>
<li>IMAGe syndrome, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/intrauterine-growth-restriction-metaphyseal-dysplasia-adrenal-hypoplasia-congenita-and-genital-anomalies/">Intrauterine growth restriction, metaphyseal dysplasia, adrenal hypoplasia congenita, and genital anomalies</a></li>
<li>IMD2, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/wiskott-aldrich-syndrome/">Wiskott-Aldrich syndrome</a></li>
<li>Imerslund-Grasbeck syndrome, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/imerslund-grasbeck-syndrome/">Imerslund-Gräsbeck syndrome</a></li>
<li><a href="https://medlineplus.gov/genetics/condition/imerslund-grasbeck-syndrome/">Imerslund-Gräsbeck syndrome</a></li>
<li>Imidodipeptidase deficiency, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/prolidase-deficiency/">Prolidase deficiency</a></li>
<li>Immigration delay disease, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/adermatoglyphia/">Adermatoglyphia</a></li>
<li>Immotile cilia syndrome, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/primary-ciliary-dyskinesia/">Primary ciliary dyskinesia</a></li>
<li><a href="https://medlineplus.gov/genetics/condition/immune-dysregulation-polyendocrinopathy-enteropathy-x-linked-syndrome/">Immune dysregulation, polyendocrinopathy, enteropathy, X-linked syndrome</a></li>
<li><a href="https://medlineplus.gov/genetics/condition/immune-thrombocytopenia/">Immune thrombocytopenia</a></li>
<li>Immune thrombocytopenic purpura, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/immune-thrombocytopenia/">Immune thrombocytopenia</a></li>
<li>Immune-deficient poikiloderma, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/poikiloderma-with-neutropenia/">Poikiloderma with neutropenia</a></li>
<li>Immunodeficiency 14, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/activated-pi3k-delta-syndrome/">Activated PI3K-delta syndrome</a></li>
<li>Immunodeficiency 2, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/wiskott-aldrich-syndrome/">Wiskott-Aldrich syndrome</a></li>
<li>Immunodeficiency 23, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/pgm3-congenital-disorder-of-glycosylation/">PGM3-congenital disorder of glycosylation</a></li>
<li>Immunodeficiency 36, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/activated-pi3k-delta-syndrome/">Activated PI3K-delta syndrome</a></li>
<li>Immunodeficiency with cleft lip/palate, cataract, hypopigmentation and absent corpus callosum, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/vici-syndrome/">Vici syndrome</a></li>
<li>Immunodeficiency with hyper IgE and cognitive impairment, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/pgm3-congenital-disorder-of-glycosylation/">PGM3-congenital disorder of glycosylation</a></li>
<li>Immunodeficiency with Hyper-IgM, type 1, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/x-linked-hyper-igm-syndrome/">X-linked hyper IgM syndrome</a></li>
<li>Immunodeficiency, common variable, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/common-variable-immune-deficiency/">Common variable immune deficiency</a></li>
<li>Immunodeficiency, polyendocrinopathy, and enteropathy, X-linked, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/immune-dysregulation-polyendocrinopathy-enteropathy-x-linked-syndrome/">Immune dysregulation, polyendocrinopathy, enteropathy, X-linked syndrome</a></li>
<li>Immunodeficiency, X-linked, with magnesium defect, Epstein-Barr virus infection, and neoplasia, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/x-linked-immunodeficiency-with-magnesium-defect-epstein-barr-virus-infection-and-neoplasia/">X-linked immunodeficiency with magnesium defect, Epstein-Barr virus infection, and neoplasia</a></li>
<li>Immunodeficiency-vasculitis-myoclonus syndrome, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/pgm3-congenital-disorder-of-glycosylation/">PGM3-congenital disorder of glycosylation</a></li>
<li>Immunoosseous dysplasia, Schimke type, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/schimke-immuno-osseous-dysplasia/">Schimke immuno-osseous dysplasia</a></li>
<li>Imperforate anus-hand and foot anomalies syndrome, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/townes-brocks-syndrome/">Townes-Brocks Syndrome</a></li>
<li>INAD, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/infantile-neuroaxonal-dystrophy/">Infantile neuroaxonal dystrophy</a></li>
<li>Inclusion body myopathy type 2, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/gne-myopathy/">GNE myopathy</a></li>
<li><a href="https://medlineplus.gov/genetics/condition/inclusion-body-myopathy-with-early-onset-paget-disease-and-frontotemporal-dementia/">Inclusion body myopathy with early-onset Paget disease and frontotemporal dementia</a></li>
<li>Inclusion body myopathy with early-onset Paget disease of bone and/or frontotemporal dementia, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/inclusion-body-myopathy-with-early-onset-paget-disease-and-frontotemporal-dementia/">Inclusion body myopathy with early-onset Paget disease and frontotemporal dementia</a></li>
<li>Inclusion body myopathy with Paget disease of bone and/or frontotemporal dementia, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/inclusion-body-myopathy-with-early-onset-paget-disease-and-frontotemporal-dementia/">Inclusion body myopathy with early-onset Paget disease and frontotemporal dementia</a></li>
<li>Inclusion body myopathy, hereditary, autosomal recessive, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/gne-myopathy/">GNE myopathy</a></li>
<li>Inclusion body myopathy, quadriceps-sparing, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/gne-myopathy/">GNE myopathy</a></li>
<li>Inclusion cell disease, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/mucolipidosis-ii-alpha-beta/">Mucolipidosis II alpha/beta</a></li>
<li><a href="https://medlineplus.gov/genetics/condition/incontinentia-pigmenti/">Incontinentia pigmenti</a></li>
<li>Increased aromatase activity, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/aromatase-excess-syndrome/">Aromatase excess syndrome</a></li>
<li>Indifference to pain, congenital, autosomal recessive, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/channelopathy-associated-congenital-insensitivity-to-pain/">Channelopathy-associated congenital insensitivity to pain</a></li>
<li>Infancy hyperinsulinemia hypoglycemia, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/congenital-hyperinsulinism/">Congenital hyperinsulinism</a></li>
<li>Infantile Batten disease, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/cln1-disease/">CLN1 disease</a></li>
<li>Infantile calcifying arteriopathy, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/generalized-arterial-calcification-of-infancy/">Generalized arterial calcification of infancy</a></li>
<li>Infantile cortical hyperostosis, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/caffey-disease/">Caffey disease</a></li>
<li>Infantile epileptic-dyskinetic encephalopathy, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/developmental-and-epileptic-encephalopathy-1/">Developmental and epileptic encephalopathy 1</a></li>
<li>Infantile genetic agranulocytosis, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/severe-congenital-neutropenia/">Severe congenital neutropenia</a></li>
<li>Infantile hemiplegia with porencephaly, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/familial-porencephaly/">Familial porencephaly</a></li>
<li>Infantile hypotonia with psychomotor retardation and characteristic facies-2, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/unc80-deficiency/">UNC80 deficiency</a></li>
<li>Infantile leukoencephalopathy and megalencephaly, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/megalencephalic-leukoencephalopathy-with-subcortical-cysts/">Megalencephalic leukoencephalopathy with subcortical cysts</a></li>
<li>Infantile multiple carboxylase deficiency, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/holocarboxylase-synthetase-deficiency/">Holocarboxylase synthetase deficiency</a></li>
<li><a href="https://medlineplus.gov/genetics/condition/infantile-neuroaxonal-dystrophy/">Infantile neuroaxonal dystrophy</a></li>
<li>Infantile neuronal ceroid lipofuscinosis, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/cln1-disease/">CLN1 disease</a></li>
<li>Infantile onset ascending spastic paralysis, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/infantile-onset-ascending-hereditary-spastic-paralysis/">Infantile-onset ascending hereditary spastic paralysis</a></li>
<li>Infantile optic atrophy with chorea and spastic paraplegia, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/costeff-syndrome/">Costeff syndrome</a></li>
<li>Infantile parkinsonism-dystonia, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/dopamine-transporter-deficiency-syndrome/">Dopamine transporter deficiency syndrome</a></li>
<li>Infantile subacute necrotizing encephalopathy, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/leigh-syndrome/">Leigh syndrome</a></li>
<li>Infantile thoracic dystrophy, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/asphyxiating-thoracic-dystrophy/">Asphyxiating thoracic dystrophy</a></li>
<li>Infantile X-linked SMA, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/x-linked-infantile-spinal-muscular-atrophy/">X-linked infantile spinal muscular atrophy</a></li>
<li><a href="https://medlineplus.gov/genetics/condition/infantile-onset-ascending-hereditary-spastic-paralysis/">Infantile-onset ascending hereditary spastic paralysis</a></li>
<li>Infantile-onset ascending hereditary spastic paraplegia, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/infantile-onset-ascending-hereditary-spastic-paralysis/">Infantile-onset ascending hereditary spastic paralysis</a></li>
<li><a href="https://medlineplus.gov/genetics/condition/infantile-onset-spinocerebellar-ataxia/">Infantile-onset spinocerebellar ataxia</a></li>
<li>Infantile-onset symptomatic epilepsy syndrome, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/gm3-synthase-deficiency/">GM3 synthase deficiency</a></li>
<li>Infection by Borrelia burgdorferi, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/lyme-disease/">Lyme disease</a></li>
<li>Infection due to Borrelia burgdorferi sensu lato, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/lyme-disease/">Lyme disease</a></li>
<li>Infection due to Mycobacterium leprae, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/leprosy/">Leprosy</a></li>
<li>Infertility associated with multi-tailed spermatozoa and excessive DNA, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/macrozoospermia/">Macrozoospermia</a></li>
<li>Inflammatory bowel disease, ulcerative colitis type, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/ulcerative-colitis/">Ulcerative colitis</a></li>
<li>Inflammatory myopathy, idiopathic, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/idiopathic-inflammatory-myopathy/">Idiopathic inflammatory myopathy</a></li>
<li>Inherited emphysema, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/alpha-1-antitrypsin-deficiency/">Alpha-1 antitrypsin deficiency</a></li>
<li>Inherited erythroblastopenia, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/diamond-blackfan-anemia/">Diamond-Blackfan anemia</a></li>
<li>Inherited human transmissible spongiform encephalopathies, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/prion-disease/">Prion disease</a></li>
<li>Inherited systemic hyalinosis, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/hyaline-fibromatosis-syndrome/">Hyaline fibromatosis syndrome</a></li>
<li>Inherited tendency to pressure palsies, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/hereditary-neuropathy-with-liability-to-pressure-palsies/">Hereditary neuropathy with liability to pressure palsies</a></li>
<li><a href="https://medlineplus.gov/genetics/condition/inherited-thyroxine-binding-globulin-deficiency/">Inherited thyroxine-binding globulin deficiency</a></li>
<li>Insley-Astley syndrome, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/otospondylomegaepiphyseal-dysplasia/">Otospondylomegaepiphyseal dysplasia</a></li>
<li>Insulin resistance - type A, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/type-a-insulin-resistance-syndrome/">Type A insulin resistance syndrome</a></li>
<li>Insulin resistance syndrome, type A, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/type-a-insulin-resistance-syndrome/">Type A insulin resistance syndrome</a></li>
<li>Insulin-dependent diabetes mellitus, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/type-1-diabetes/">Type 1 diabetes</a></li>
<li>Insulin-dependent diabetes mellitus secretory diarrhea syndrome, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/immune-dysregulation-polyendocrinopathy-enteropathy-x-linked-syndrome/">Immune dysregulation, polyendocrinopathy, enteropathy, X-linked syndrome</a></li>
<li>Insulin-resistance syndrome type A, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/type-a-insulin-resistance-syndrome/">Type A insulin resistance syndrome</a></li>
<li>Insulin-resistant diabetes mellitus and acanthosis nigricans, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/type-a-insulin-resistance-syndrome/">Type A insulin resistance syndrome</a></li>
<li>Intellectual deficit, X-linked, South African type, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/christianson-syndrome/">Christianson syndrome</a></li>
<li>Intellectual developmental disorder 62, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/dlg4-related-synaptopathy/">DLG4-related synaptopathy</a></li>
<li>Intellectual developmental disorder with macrocephaly, speech delay, and dysmorphic facies, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/snijders-blok-campeau-syndrome/">Snijders Blok-Campeau syndrome</a></li>
<li>intellectual developmental disorder, autosomal dominant 62, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/dlg4-related-synaptopathy/">DLG4-related synaptopathy</a></li>
<li>Intellectual disability and distinctive facial features with or without cardiac defects, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/med13l-syndrome/">MED13L syndrome</a></li>
<li>Intellectual disability, Birk-Barel type, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/kcnk9-imprinting-syndrome/">KCNK9 imprinting syndrome</a></li>
<li>Intellectual disability-craniofacial dysmorphism-cryptorchidism syndrome, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/pacs1-syndrome/">PACS1 syndrome</a></li>
<li>Intellectual disability-hypotonia-facial dysmorphism syndrome, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/kcnk9-imprinting-syndrome/">KCNK9 imprinting syndrome</a></li>
<li>Interleukin-1 receptor-associated kinase 4 deficiency, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/irak-4-deficiency/">IRAK-4 deficiency</a></li>
<li>Intermittent ataxia with pyruvate dehydrogenase deficiency, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/pyruvate-dehydrogenase-deficiency/">Pyruvate dehydrogenase deficiency</a></li>
<li>Interstitial deletion of chromosome 15q24, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/15q24-microdeletion/">15q24 microdeletion</a></li>
<li>Interstitial lung disease due to surfactant deficiency, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/surfactant-dysfunction/">Surfactant dysfunction</a></li>
<li>Intervertebral disc degeneration, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/intervertebral-disc-disease/">Intervertebral disc disease</a></li>
<li><a href="https://medlineplus.gov/genetics/condition/intervertebral-disc-disease/">Intervertebral disc disease</a></li>
<li>Intervertebral disc disorder, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/intervertebral-disc-disease/">Intervertebral disc disease</a></li>
<li>Intervertebral disk degeneration, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/intervertebral-disc-disease/">Intervertebral disc disease</a></li>
<li>Intestinal hypomagnesemia 1, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/hypomagnesemia-with-secondary-hypocalcemia/">Hypomagnesemia with secondary hypocalcemia</a></li>
<li>Intestinal hypomagnesemia with secondary hypocalcemia, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/hypomagnesemia-with-secondary-hypocalcemia/">Hypomagnesemia with secondary hypocalcemia</a></li>
<li>Intestinal lymphagiectasia-lymphedema-mental retardation syndrome, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/hennekam-syndrome/">Hennekam syndrome</a></li>
<li>Intestinal polyposis-cutaneous pigmentation syndrome, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/peutz-jeghers-syndrome/">Peutz-Jeghers syndrome</a></li>
<li><a href="https://medlineplus.gov/genetics/condition/intestinal-pseudo-obstruction/">Intestinal pseudo-obstruction</a></li>
<li>Intracerebral cavernous hemangioma, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/cerebral-cavernous-malformation/">Cerebral cavernous malformation</a></li>
<li>Intractable diarrhea of infancy, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/microvillus-inclusion-disease/">Microvillus inclusion disease</a></li>
<li>Intractable diarrhea with phenotypic anomalies, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/trichohepatoenteric-syndrome/">Trichohepatoenteric syndrome</a></li>
<li>Intrahepatic cholangiocarcinoma, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/cholangiocarcinoma/">Cholangiocarcinoma</a></li>
<li><a href="https://medlineplus.gov/genetics/condition/intrahepatic-cholestasis-of-pregnancy/">Intrahepatic cholestasis of pregnancy</a></li>
<li>Intranuclear nemaline rod myopathy, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/intranuclear-rod-myopathy/">Intranuclear rod myopathy</a></li>
<li><a href="https://medlineplus.gov/genetics/condition/intranuclear-rod-myopathy/">Intranuclear rod myopathy</a></li>
<li><a href="https://medlineplus.gov/genetics/condition/intrauterine-growth-restriction-metaphyseal-dysplasia-adrenal-hypoplasia-congenita-and-genital-anomalies/">Intrauterine growth restriction, metaphyseal dysplasia, adrenal hypoplasia congenita, and genital anomalies</a></li>
<li>Inv dup(15), <i>see</i> <a href="https://medlineplus.gov/genetics/condition/15q11-q13-duplication-syndrome/">15q11-q13 duplication syndrome</a></li>
<li>Inverted duplication 15, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/15q11-q13-duplication-syndrome/">15q11-q13 duplication syndrome</a></li>
<li>Inverted smile and occult neuropathic bladder, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/ochoa-syndrome/">Ochoa syndrome</a></li>
<li>Inverted smile-neurogenic bladder, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/ochoa-syndrome/">Ochoa syndrome</a></li>
<li>IOSCA, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/infantile-onset-spinocerebellar-ataxia/">Infantile-onset spinocerebellar ataxia</a></li>
<li>IP, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/incontinentia-pigmenti/">Incontinentia pigmenti</a></li>
<li>IPEX syndrome, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/immune-dysregulation-polyendocrinopathy-enteropathy-x-linked-syndrome/">Immune dysregulation, polyendocrinopathy, enteropathy, X-linked syndrome</a></li>
<li>IPF, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/idiopathic-pulmonary-fibrosis/">Idiopathic pulmonary fibrosis</a></li>
<li>IPO, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/intestinal-pseudo-obstruction/">Intestinal pseudo-obstruction</a></li>
<li><a href="https://medlineplus.gov/genetics/condition/irak-4-deficiency/">IRAK-4 deficiency</a></li>
<li>IRAK4 deficiency, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/irak-4-deficiency/">IRAK-4 deficiency</a></li>
<li>Iraqi Jewish optic atrophy plus, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/costeff-syndrome/">Costeff syndrome</a></li>
<li>IRIDA, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/iron-refractory-iron-deficiency-anemia/">Iron-refractory iron deficiency anemia</a></li>
<li>IRIDA syndrome, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/iron-refractory-iron-deficiency-anemia/">Iron-refractory iron deficiency anemia</a></li>
<li>Irideremia, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/aniridia/">Aniridia</a></li>
<li>Irido-corneo-trabecular dysgenesis, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/peters-anomaly/">Peters anomaly</a></li>
<li>Iris coloboma with ptosis, hypertelorism, and mental retardation, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/baraitser-winter-syndrome/">Baraitser-Winter syndrome</a></li>
<li>Iron storage disorder, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/hereditary-hemochromatosis/">Hereditary hemochromatosis</a></li>
<li>Iron-handling disorder, hereditary, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/iron-refractory-iron-deficiency-anemia/">Iron-refractory iron deficiency anemia</a></li>
<li><a href="https://medlineplus.gov/genetics/condition/iron-refractory-iron-deficiency-anemia/">Iron-refractory iron deficiency anemia</a></li>
<li>Iron-sulfur cluster deficiency myopathy, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/myopathy-with-deficiency-of-iron-sulfur-cluster-assembly-enzyme/">Myopathy with deficiency of iron-sulfur cluster assembly enzyme</a></li>
<li><a href="https://medlineplus.gov/genetics/condition/isobutyryl-coa-dehydrogenase-deficiency/">Isobutyryl-CoA dehydrogenase deficiency</a></li>
<li>Isobutyryl-coenzyme A dehydrogenase deficiency, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/isobutyryl-coa-dehydrogenase-deficiency/">Isobutyryl-CoA dehydrogenase deficiency</a></li>
<li>Isochromosome 12p syndrome, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/pallister-killian-mosaic-syndrome/">Pallister-Killian mosaic syndrome</a></li>
<li>ISOD, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/isolated-sulfite-oxidase-deficiency/">Isolated sulfite oxidase deficiency</a></li>
<li>Isodicentric chromosome 15, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/15q11-q13-duplication-syndrome/">15q11-q13 duplication syndrome</a></li>
<li>Isodicentric chromosome 15 syndrome, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/15q11-q13-duplication-syndrome/">15q11-q13 duplication syndrome</a></li>
<li><a href="https://medlineplus.gov/genetics/condition/isolated-congenital-asplenia/">Isolated congenital asplenia</a></li>
<li>Isolated CoQ-cytochrome c reductase deficiency, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/mitochondrial-complex-iii-deficiency/">Mitochondrial complex III deficiency</a></li>
<li>Isolated deafness, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/nonsyndromic-hearing-loss/">Nonsyndromic hearing loss</a></li>
<li><a href="https://medlineplus.gov/genetics/condition/isolated-duane-retraction-syndrome/">Isolated Duane retraction syndrome</a></li>
<li><a href="https://medlineplus.gov/genetics/condition/isolated-ectopia-lentis/">Isolated ectopia lentis</a></li>
<li>Isolated GH deficiency, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/isolated-growth-hormone-deficiency/">Isolated growth hormone deficiency</a></li>
<li>Isolated glucocorticoid deficiency, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/familial-glucocorticoid-deficiency/">Familial glucocorticoid deficiency</a></li>
<li><a href="https://medlineplus.gov/genetics/condition/isolated-growth-hormone-deficiency/">Isolated growth hormone deficiency</a></li>
<li>Isolated HGH deficiency, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/isolated-growth-hormone-deficiency/">Isolated growth hormone deficiency</a></li>
<li>Isolated holoprosencephaly, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/nonsyndromic-holoprosencephaly/">Nonsyndromic holoprosencephaly</a></li>
<li>Isolated HPE, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/nonsyndromic-holoprosencephaly/">Nonsyndromic holoprosencephaly</a></li>
<li>Isolated human growth hormone deficiency, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/isolated-growth-hormone-deficiency/">Isolated growth hormone deficiency</a></li>
<li><a href="https://medlineplus.gov/genetics/condition/isolated-hyperchlorhidrosis/">Isolated hyperchlorhidrosis</a></li>
<li><a href="https://medlineplus.gov/genetics/condition/isolated-hyperckemia/">Isolated hyperCKemia</a></li>
<li><a href="https://medlineplus.gov/genetics/condition/isolated-lissencephaly-sequence/">Isolated lissencephaly sequence</a></li>
<li>Isolated methylmalonic acidemia, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/methylmalonic-acidemia/">Methylmalonic acidemia</a></li>
<li>Isolated noncompaction of the ventricular myocardium, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/left-ventricular-noncompaction/">Left ventricular noncompaction</a></li>
<li><a href="https://medlineplus.gov/genetics/condition/isolated-pierre-robin-sequence/">Isolated Pierre Robin sequence</a></li>
<li>Isolated pulmonary venous sclerosis, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/pulmonary-veno-occlusive-disease/">Pulmonary veno-occlusive disease</a></li>
<li>Isolated somatotropin deficiency, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/isolated-growth-hormone-deficiency/">Isolated growth hormone deficiency</a></li>
<li>Isolated somatotropin deficiency disorder, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/isolated-growth-hormone-deficiency/">Isolated growth hormone deficiency</a></li>
<li><a href="https://medlineplus.gov/genetics/condition/isolated-sulfite-oxidase-deficiency/">Isolated sulfite oxidase deficiency</a></li>
<li>Isovaleric acid-CoA dehydrogenase deficiency, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/isovaleric-acidemia/">Isovaleric acidemia</a></li>
<li><a href="https://medlineplus.gov/genetics/condition/isovaleric-acidemia/">Isovaleric acidemia</a></li>
<li>Isovaleryl-CoA dehydrogenase deficiency, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/isovaleric-acidemia/">Isovaleric acidemia</a></li>
<li>ISSX, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/developmental-and-epileptic-encephalopathy-1/">Developmental and epileptic encephalopathy 1</a></li>
<li>ISSX1, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/developmental-and-epileptic-encephalopathy-1/">Developmental and epileptic encephalopathy 1</a></li>
<li>ITP, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/immune-thrombocytopenia/">Immune thrombocytopenia</a></li>
<li>IVA, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/isovaleric-acidemia/">Isovaleric acidemia</a></li>
<li>IVD deficiency, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/isovaleric-acidemia/">Isovaleric acidemia</a></li>
<li>Ivemark syndrome, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/heterotaxy-syndrome/">Heterotaxy syndrome</a></li>
<li>IWC, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/ichthyosis-with-confetti/">Ichthyosis with confetti</a></li>
</ul>
</section>
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