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<span>Genetic Conditions: O</span>
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<h1>Genetic Conditions: O</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><a href="https://medlineplus.gov/genetics/condition-i/" data-alpha="I">I</a></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><span class="active">O</span></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>OA, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/ocular-albinism/">Ocular albinism</a></li>
<li>OA, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/osteoarthritis/">Osteoarthritis</a></li>
<li>OAS, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/ophthalmo-acromelic-syndrome/">Ophthalmo-acromelic syndrome</a></li>
<li>OAT deficiency, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/gyrate-atrophy-of-the-choroid-and-retina/">Gyrate atrophy of the choroid and retina</a></li>
<li>OAV complex, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/craniofacial-microsomia/">Craniofacial microsomia</a></li>
<li>OAVS, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/craniofacial-microsomia/">Craniofacial microsomia</a></li>
<li>Oberklaid-Danks syndrome, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/bohring-opitz-syndrome/">Bohring-Opitz syndrome</a></li>
<li>Obesity due to congenital leptin deficiency, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/congenital-leptin-deficiency/">Congenital leptin deficiency</a></li>
<li>Obesity due to leptin receptor gene deficiency, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/leptin-receptor-deficiency/">Leptin receptor deficiency</a></li>
<li>Obesity, early-onset, adrenal insufficiency, and red hair, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/proopiomelanocortin-deficiency/">Proopiomelanocortin deficiency</a></li>
<li>Obesity, morbid, due to leptin deficiency, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/congenital-leptin-deficiency/">Congenital leptin deficiency</a></li>
<li>Obesity, morbid, due to leptin receptor deficiency, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/leptin-receptor-deficiency/">Leptin receptor deficiency</a></li>
<li>Obesity, morbid, nonsyndromic 1, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/congenital-leptin-deficiency/">Congenital leptin deficiency</a></li>
<li>Obesity, morbid, nonsyndromic 2, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/leptin-receptor-deficiency/">Leptin receptor deficiency</a></li>
<li>Obesity, severe, due to leptin deficiency, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/congenital-leptin-deficiency/">Congenital leptin deficiency</a></li>
<li>Obesity-hypotonia syndrome, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/cohen-syndrome/">Cohen syndrome</a></li>
<li><a href="https://medlineplus.gov/genetics/condition/obsessive-compulsive-disorder/">Obsessive-compulsive disorder</a></li>
<li>Obsessive-compulsive neurosis, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/obsessive-compulsive-disorder/">Obsessive-compulsive disorder</a></li>
<li>Obstetric cholestasis, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/intrahepatic-cholestasis-of-pregnancy/">Intrahepatic cholestasis of pregnancy</a></li>
<li>Obstructive apnea, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/obstructive-sleep-apnea/">Obstructive sleep apnea</a></li>
<li>Obstructive disease of the pulmonary veins, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/pulmonary-veno-occlusive-disease/">Pulmonary veno-occlusive disease</a></li>
<li><a href="https://medlineplus.gov/genetics/condition/obstructive-sleep-apnea/">Obstructive sleep apnea</a></li>
<li>Obstructive sleep apnea syndrome, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/obstructive-sleep-apnea/">Obstructive sleep apnea</a></li>
<li>OCA, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/oculocutaneous-albinism/">Oculocutaneous albinism</a></li>
<li>Occlusive infantile arteriopathy, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/generalized-arterial-calcification-of-infancy/">Generalized arterial calcification of infancy</a></li>
<li>Occupational cramp, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/task-specific-focal-dystonia/">Task-specific focal dystonia</a></li>
<li>Occupational dystonia, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/task-specific-focal-dystonia/">Task-specific focal dystonia</a></li>
<li>OCD, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/familial-osteochondritis-dissecans/">Familial osteochondritis dissecans</a></li>
<li>OCD, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/obsessive-compulsive-disorder/">Obsessive-compulsive disorder</a></li>
<li><a href="https://medlineplus.gov/genetics/condition/ochoa-syndrome/">Ochoa syndrome</a></li>
<li><a href="https://medlineplus.gov/genetics/condition/ocular-albinism/">Ocular albinism</a></li>
<li>Ocular coloboma, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/coloboma/">Coloboma</a></li>
<li>Ocular retraction syndrome, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/isolated-duane-retraction-syndrome/">Isolated Duane retraction syndrome</a></li>
<li>Ocular rosacea, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/rosacea/">Rosacea</a></li>
<li>Oculo-dento-digital dysplasia, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/oculodentodigital-dysplasia/">Oculodentodigital dysplasia</a></li>
<li>Oculo-dento-osseous dysplasia, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/oculodentodigital-dysplasia/">Oculodentodigital dysplasia</a></li>
<li>Oculo-digito-esophagoduodental (ODED) syndrome, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/feingold-syndrome/">Feingold syndrome</a></li>
<li>Oculo-facio-cardio-dental syndrome, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/oculofaciocardiodental-syndrome/">Oculofaciocardiodental syndrome</a></li>
<li>Oculo-oto-facial dysplasia, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/burn-mckeown-syndrome/">Burn-McKeown syndrome</a></li>
<li>Oculo-skeletal-abdominal syndrome, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/3mc-syndrome/">3MC syndrome</a></li>
<li>Oculoauriculovertebral spectrum, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/craniofacial-microsomia/">Craniofacial microsomia</a></li>
<li>Oculocerebrofacial syndrome, Kaufman type, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/kaufman-oculocerebrofacial-syndrome/">Kaufman oculocerebrofacial syndrome</a></li>
<li>Oculocerebrorenal syndrome, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/lowe-syndrome/">Lowe syndrome</a></li>
<li>Oculocerebrorenal syndrome of Lowe, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/lowe-syndrome/">Lowe syndrome</a></li>
<li><a href="https://medlineplus.gov/genetics/condition/oculocutaneous-albinism/">Oculocutaneous albinism</a></li>
<li>Oculocutaneous albinism with leukocyte defect, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/chediak-higashi-syndrome/">Chediak-Higashi syndrome</a></li>
<li><a href="https://medlineplus.gov/genetics/condition/oculodentodigital-dysplasia/">Oculodentodigital dysplasia</a></li>
<li>Oculodentodigital syndrome, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/oculodentodigital-dysplasia/">Oculodentodigital dysplasia</a></li>
<li>Oculodentoosseous dysplasia, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/oculodentodigital-dysplasia/">Oculodentodigital dysplasia</a></li>
<li><a href="https://medlineplus.gov/genetics/condition/oculofaciocardiodental-syndrome/">Oculofaciocardiodental syndrome</a></li>
<li>Oculogastrointestinal muscular dystrophy, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/mitochondrial-neurogastrointestinal-encephalopathy-disease/">Mitochondrial neurogastrointestinal encephalopathy disease</a></li>
<li>Oculootofacial dysplasia, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/burn-mckeown-syndrome/">Burn-McKeown syndrome</a></li>
<li>Oculopalatoskeletal syndrome, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/3mc-syndrome/">3MC syndrome</a></li>
<li>Oculopharyngeal dystrophy, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/oculopharyngeal-muscular-dystrophy/">Oculopharyngeal muscular dystrophy</a></li>
<li><a href="https://medlineplus.gov/genetics/condition/oculopharyngeal-muscular-dystrophy/">Oculopharyngeal muscular dystrophy</a></li>
<li>Oculosympathetic palsy, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/horner-syndrome/">Horner syndrome</a></li>
<li>OD, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/familial-osteochondritis-dissecans/">Familial osteochondritis dissecans</a></li>
<li>ODD syndrome, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/oculodentodigital-dysplasia/">Oculodentodigital dysplasia</a></li>
<li>ODDD, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/oculodentodigital-dysplasia/">Oculodentodigital dysplasia</a></li>
<li>ODOD, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/oculodentodigital-dysplasia/">Oculodentodigital dysplasia</a></li>
<li>Odontoleukodystrophy, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/pol-iii-related-leukodystrophy/">Pol III-related leukodystrophy</a></li>
<li>Oestrogen synthetase deficiency, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/aromatase-deficiency/">Aromatase deficiency</a></li>
<li>OFCD syndrome, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/oculofaciocardiodental-syndrome/">Oculofaciocardiodental syndrome</a></li>
<li>OFDS, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/oral-facial-digital-syndrome/">Oral-facial-digital syndrome</a></li>
<li>OGD, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/osteoglophonic-dysplasia/">Osteoglophonic dysplasia</a></li>
<li>OGIMD, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/mitochondrial-neurogastrointestinal-encephalopathy-disease/">Mitochondrial neurogastrointestinal encephalopathy disease</a></li>
<li>Ohaha syndrome, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/infantile-onset-spinocerebellar-ataxia/">Infantile-onset spinocerebellar ataxia</a></li>
<li><a href="https://medlineplus.gov/genetics/condition/ohdo-syndrome-maat-kievit-brunner-type/">Ohdo syndrome, Maat-Kievit-Brunner type</a></li>
<li>Ohdo syndrome, MKB type, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/ohdo-syndrome-maat-kievit-brunner-type/">Ohdo syndrome, Maat-Kievit-Brunner type</a></li>
<li>Ohdo syndrome, Say-Barber-Biesecker variant, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/ohdo-syndrome-say-barber-biesecker-young-simpson-variant/">Ohdo syndrome, Say-Barber-Biesecker-Young-Simpson variant</a></li>
<li><a href="https://medlineplus.gov/genetics/condition/ohdo-syndrome-say-barber-biesecker-young-simpson-variant/">Ohdo syndrome, Say-Barber-Biesecker-Young-Simpson variant</a></li>
<li>Ohdo syndrome, SBBYS variant, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/ohdo-syndrome-say-barber-biesecker-young-simpson-variant/">Ohdo syndrome, Say-Barber-Biesecker-Young-Simpson variant</a></li>
<li>OI, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/osteogenesis-imperfecta/">Osteogenesis imperfecta</a></li>
<li>Okamoto syndrome, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/au-kline-syndrome/">Au-Kline syndrome</a></li>
<li>Okihiro syndrome, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/duane-radial-ray-syndrome/">Duane-radial ray syndrome</a></li>
<li>OKS, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/fg-syndrome/">FG syndrome</a></li>
<li>OKT deficiency, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/gyrate-atrophy-of-the-choroid-and-retina/">Gyrate atrophy of the choroid and retina</a></li>
<li>Old Silk Route disease, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/behcet-disease/">Behçet disease</a></li>
<li>Old-aged sensorineural hearing impairment, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/age-related-hearing-loss/">Age-related hearing loss</a></li>
<li>Oligophrenia microphthalmus, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/norrie-disease/">Norrie disease</a></li>
<li>Olivopontocerebellar atrophy I, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/spinocerebellar-ataxia-type-1/">Spinocerebellar ataxia type 1</a></li>
<li><a href="https://medlineplus.gov/genetics/condition/ollier-disease/">Ollier disease</a></li>
<li>Ollier&#x27;s syndrome, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/ollier-disease/">Ollier disease</a></li>
<li><a href="https://medlineplus.gov/genetics/condition/omenn-syndrome/">Omenn syndrome</a></li>
<li>Omenn&#x27;s syndrome, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/omenn-syndrome/">Omenn syndrome</a></li>
<li>Omphalocele, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/abdominal-wall-defect/">Abdominal wall defect</a></li>
<li>ONCR, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/renal-coloboma-syndrome/">Renal coloboma syndrome</a></li>
<li>Ondine syndrome, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/congenital-central-hypoventilation-syndrome/">Congenital central hypoventilation syndrome</a></li>
<li>Ondine-Hirschsprung disease, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/congenital-central-hypoventilation-syndrome/">Congenital central hypoventilation syndrome</a></li>
<li>Onychauxis, hyponychia, and onycholysis, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/nonsyndromic-congenital-nail-disorder-10/">Nonsyndromic congenital nail disorder 10</a></li>
<li>OOFD, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/burn-mckeown-syndrome/">Burn-McKeown syndrome</a></li>
<li>OPA3, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/autosomal-dominant-optic-atrophy-and-cataract/">Autosomal dominant optic atrophy and cataract</a></li>
<li>OPA3 defect, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/costeff-syndrome/">Costeff syndrome</a></li>
<li>OPA3, autosomal dominant, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/autosomal-dominant-optic-atrophy-and-cataract/">Autosomal dominant optic atrophy and cataract</a></li>
<li>OPCA, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/multiple-system-atrophy/">Multiple system atrophy</a></li>
<li>OPCH, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/pontocerebellar-hypoplasia/">Pontocerebellar hypoplasia</a></li>
<li>OPD syndrome, type 1, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/otopalatodigital-syndrome-type-1/">Otopalatodigital syndrome type 1</a></li>
<li>OPD syndrome, type 2, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/otopalatodigital-syndrome-type-2/">Otopalatodigital syndrome type 2</a></li>
<li>Open spine, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/spina-bifida/">Spina bifida</a></li>
<li><a href="https://medlineplus.gov/genetics/condition/ophthalmo-acromelic-syndrome/">Ophthalmo-acromelic syndrome</a></li>
<li>Ophthalmoacromelic syndrome, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/ophthalmo-acromelic-syndrome/">Ophthalmo-acromelic syndrome</a></li>
<li>Ophthalmoplegia, hypotonia, ataxia, hypacusis, and athetosis, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/infantile-onset-spinocerebellar-ataxia/">Infantile-onset spinocerebellar ataxia</a></li>
<li>Ophthalmoplegia, progressive external, and scoliosis, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/horizontal-gaze-palsy-with-progressive-scoliosis/">Horizontal gaze palsy with progressive scoliosis</a></li>
<li>Opiate addiction, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/opioid-addiction/">Opioid addiction</a></li>
<li>Opiate dependence, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/opioid-addiction/">Opioid addiction</a></li>
<li><a href="https://medlineplus.gov/genetics/condition/opioid-addiction/">Opioid addiction</a></li>
<li>Opioid dependence, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/opioid-addiction/">Opioid addiction</a></li>
<li>Opitz BBB syndrome, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/opitz-g-bbb-syndrome/">Opitz G/BBB syndrome</a></li>
<li>Opitz BBB/G syndrome, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/opitz-g-bbb-syndrome/">Opitz G/BBB syndrome</a></li>
<li>Opitz G syndrome, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/opitz-g-bbb-syndrome/">Opitz G/BBB syndrome</a></li>
<li><a href="https://medlineplus.gov/genetics/condition/opitz-g-bbb-syndrome/">Opitz G/BBB syndrome</a></li>
<li>Opitz syndrome, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/opitz-g-bbb-syndrome/">Opitz G/BBB syndrome</a></li>
<li>Opitz trigonocephaly-like syndrome, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/bohring-opitz-syndrome/">Bohring-Opitz syndrome</a></li>
<li>Opitz-Frias syndrome, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/opitz-g-bbb-syndrome/">Opitz G/BBB syndrome</a></li>
<li>Opitz-Kaveggia syndrome, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/fg-syndrome/">FG syndrome</a></li>
<li>OPMD, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/oculopharyngeal-muscular-dystrophy/">Oculopharyngeal muscular dystrophy</a></li>
<li>Oppenheim dystonia, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/early-onset-isolated-dystonia/">Early-onset isolated dystonia</a></li>
<li>Oppenheim&#x27;s dystonia, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/early-onset-isolated-dystonia/">Early-onset isolated dystonia</a></li>
<li>OPPG, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/osteoporosis-pseudoglioma-syndrome/">Osteoporosis-pseudoglioma syndrome</a></li>
<li>Optic atrophy and cataract, autosomal dominant, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/autosomal-dominant-optic-atrophy-and-cataract/">Autosomal dominant optic atrophy and cataract</a></li>
<li>Optic atrophy plus syndrome, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/costeff-syndrome/">Costeff syndrome</a></li>
<li><a href="https://medlineplus.gov/genetics/condition/optic-atrophy-type-1/">Optic atrophy type 1</a></li>
<li>Optic atrophy type 3, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/autosomal-dominant-optic-atrophy-and-cataract/">Autosomal dominant optic atrophy and cataract</a></li>
<li>Optic atrophy, autosomal dominant, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/optic-atrophy-type-1/">Optic atrophy type 1</a></li>
<li>Optic atrophy, cataract, and neurologic disorder, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/autosomal-dominant-optic-atrophy-and-cataract/">Autosomal dominant optic atrophy and cataract</a></li>
<li>Optic atrophy, hereditary, autosomal dominant, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/optic-atrophy-type-1/">Optic atrophy type 1</a></li>
<li>Optic atrophy, juvenile, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/optic-atrophy-type-1/">Optic atrophy type 1</a></li>
<li>Optic atrophy, Kjer type, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/optic-atrophy-type-1/">Optic atrophy type 1</a></li>
<li>Optic coloboma, vesicoureteral reflux, and renal anomalies, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/renal-coloboma-syndrome/">Renal coloboma syndrome</a></li>
<li>Optic nerve coloboma renal syndrome, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/renal-coloboma-syndrome/">Renal coloboma syndrome</a></li>
<li>Optic-spinal MS, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/neuromyelitis-optica/">Neuromyelitis optica</a></li>
<li>Opticoacoustic nerve atrophy with dementia, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/deafness-dystonia-optic-neuronopathy-syndrome/">Deafness-dystonia-optic neuronopathy syndrome</a></li>
<li>Opticospinal MS, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/neuromyelitis-optica/">Neuromyelitis optica</a></li>
<li><a href="https://medlineplus.gov/genetics/condition/oral-facial-digital-syndrome/">Oral-facial-digital syndrome</a></li>
<li>Oral-mandibular-auricular syndrome, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/craniofacial-microsomia/">Craniofacial microsomia</a></li>
<li>ORAS, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/otulipenia/">Otulipenia</a></li>
<li>Ormond disease, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/retroperitoneal-fibrosis/">Retroperitoneal fibrosis</a></li>
<li>Ormond&#x27;s disease, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/retroperitoneal-fibrosis/">Retroperitoneal fibrosis</a></li>
<li>Ornithine aminotransferase deficiency, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/gyrate-atrophy-of-the-choroid-and-retina/">Gyrate atrophy of the choroid and retina</a></li>
<li>Ornithine Carbamoyltransferase Deficiency Disease, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/ornithine-transcarbamylase-deficiency/">Ornithine transcarbamylase deficiency</a></li>
<li>Ornithine keto acid aminotransferase deficiency, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/gyrate-atrophy-of-the-choroid-and-retina/">Gyrate atrophy of the choroid and retina</a></li>
<li><a href="https://medlineplus.gov/genetics/condition/ornithine-transcarbamylase-deficiency/">Ornithine transcarbamylase deficiency</a></li>
<li><a href="https://medlineplus.gov/genetics/condition/ornithine-translocase-deficiency/">Ornithine translocase deficiency</a></li>
<li>Ornithine-delta-aminotransferase deficiency, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/gyrate-atrophy-of-the-choroid-and-retina/">Gyrate atrophy of the choroid and retina</a></li>
<li>Ornithinemia with gyrate atrophy, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/gyrate-atrophy-of-the-choroid-and-retina/">Gyrate atrophy of the choroid and retina</a></li>
<li>Oro-facio-digital syndrome, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/oral-facial-digital-syndrome/">Oral-facial-digital syndrome</a></li>
<li>Orodigitofacial dysostosis, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/oral-facial-digital-syndrome/">Oral-facial-digital syndrome</a></li>
<li>Orodigitofacial syndrome, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/oral-facial-digital-syndrome/">Oral-facial-digital syndrome</a></li>
<li>Orofaciodigital syndrome, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/oral-facial-digital-syndrome/">Oral-facial-digital syndrome</a></li>
<li><a href="https://medlineplus.gov/genetics/condition/orthostatic-hypotension/">Orthostatic hypotension</a></li>
<li>OSA, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/obstructive-sleep-apnea/">Obstructive sleep apnea</a></li>
<li>OSA syndrome, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/3mc-syndrome/">3MC syndrome</a></li>
<li>OSAHS, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/obstructive-sleep-apnea/">Obstructive sleep apnea</a></li>
<li>OSAS, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/obstructive-sleep-apnea/">Obstructive sleep apnea</a></li>
<li>Osler-Vaquez disease, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/polycythemia-vera/">Polycythemia vera</a></li>
<li>Osler-Weber-Rendu syndrome, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/hereditary-hemorrhagic-telangiectasia/">Hereditary hemorrhagic telangiectasia</a></li>
<li>OSMED, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/otospondylomegaepiphyseal-dysplasia/">Otospondylomegaepiphyseal dysplasia</a></li>
<li>Osseous Paget&#x27;s disease, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/paget-disease-of-bone/">Paget disease of bone</a></li>
<li>Osseous-oculo-dental dysplasia, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/oculodentodigital-dysplasia/">Oculodentodigital dysplasia</a></li>
<li>Osteitis deformans, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/paget-disease-of-bone/">Paget disease of bone</a></li>
<li>Osteitis fibrosa disseminata, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/mccune-albright-syndrome/">McCune-Albright syndrome</a></li>
<li><a href="https://medlineplus.gov/genetics/condition/osteoarthritis/">Osteoarthritis</a></li>
<li>Osteoarthritis deformans, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/osteoarthritis/">Osteoarthritis</a></li>
<li>Osteoarthrosis, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/osteoarthritis/">Osteoarthritis</a></li>
<li>Osteochalasia desmalis familiaris, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/juvenile-paget-disease/">Juvenile Paget disease</a></li>
<li>Osteochondritis dissecans, short stature, and early-onset osteoarthritis, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/familial-osteochondritis-dissecans/">Familial osteochondritis dissecans</a></li>
<li>Osteochondrosis of the capital femoral epiphysis, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/legg-calve-perthes-disease/">Legg-Calvé-Perthes disease</a></li>
<li>Osteodermia, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/progressive-osseous-heteroplasia/">Progressive osseous heteroplasia</a></li>
<li>Osteodysplastic primordial dwarfism type II, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/microcephalic-osteodysplastic-primordial-dwarfism-type-ii/">Microcephalic osteodysplastic primordial dwarfism type II</a></li>
<li>Osteodysplasty of Melnick and Needles, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/melnick-needles-syndrome/">Melnick-Needles syndrome</a></li>
<li>Osteoectasia with hyperphosphatasia, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/juvenile-paget-disease/">Juvenile Paget disease</a></li>
<li><a href="https://medlineplus.gov/genetics/condition/osteogenesis-imperfecta/">Osteogenesis imperfecta</a></li>
<li>Osteogenesis imperfecta with unusual skeletal lesions, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/gnathodiaphyseal-dysplasia/">Gnathodiaphyseal dysplasia</a></li>
<li>Osteogenesis imperfecta, Levin type, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/gnathodiaphyseal-dysplasia/">Gnathodiaphyseal dysplasia</a></li>
<li>Osteogenesis imperfecta, ocular form, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/osteoporosis-pseudoglioma-syndrome/">Osteoporosis-pseudoglioma syndrome</a></li>
<li>Osteoglophonic dwarfism, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/osteoglophonic-dysplasia/">Osteoglophonic dysplasia</a></li>
<li><a href="https://medlineplus.gov/genetics/condition/osteoglophonic-dysplasia/">Osteoglophonic dysplasia</a></li>
<li>Osteoma cutis, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/progressive-osseous-heteroplasia/">Progressive osseous heteroplasia</a></li>
<li>Osteopathia condensans disseminata, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/buschke-ollendorff-syndrome/">Buschke-Ollendorff syndrome</a></li>
<li>Osteopetroses, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/osteopetrosis/">Osteopetrosis</a></li>
<li><a href="https://medlineplus.gov/genetics/condition/osteopetrosis/">Osteopetrosis</a></li>
<li><a href="https://medlineplus.gov/genetics/condition/osteoporosis-pseudoglioma-syndrome/">Osteoporosis-pseudoglioma syndrome</a></li>
<li>Osteosis cutis, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/progressive-osseous-heteroplasia/">Progressive osseous heteroplasia</a></li>
<li>Osterreicher syndrome, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/nail-patella-syndrome/">Nail-patella syndrome</a></li>
<li>Oto-palato-digital syndrome, type I, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/otopalatodigital-syndrome-type-1/">Otopalatodigital syndrome type 1</a></li>
<li>Oto-palato-digital syndrome, type II, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/otopalatodigital-syndrome-type-2/">Otopalatodigital syndrome type 2</a></li>
<li>Oto-spondylo-megaepiphyseal dysplasia, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/otospondylomegaepiphyseal-dysplasia/">Otospondylomegaepiphyseal dysplasia</a></li>
<li>Otogenic vertigo, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/meniere-disease/">Ménière disease</a></li>
<li>Otomandibular dysostosis, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/craniofacial-microsomia/">Craniofacial microsomia</a></li>
<li><a href="https://medlineplus.gov/genetics/condition/otopalatodigital-syndrome-type-1/">Otopalatodigital syndrome type 1</a></li>
<li><a href="https://medlineplus.gov/genetics/condition/otopalatodigital-syndrome-type-2/">Otopalatodigital syndrome type 2</a></li>
<li><a href="https://medlineplus.gov/genetics/condition/otospondylomegaepiphyseal-dysplasia/">Otospondylomegaepiphyseal dysplasia</a></li>
<li>Otospondylomegaepiphyseal dysplasia, autosomal dominant, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/weissenbacher-zweymuller-syndrome/">Weissenbacher-Zweymüller syndrome</a></li>
<li>OTULIN-related autoinflammatory syndrome, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/otulipenia/">Otulipenia</a></li>
<li><a href="https://medlineplus.gov/genetics/condition/otulipenia/">Otulipenia</a></li>
<li><a href="https://medlineplus.gov/genetics/condition/ovarian-cancer/">Ovarian cancer</a></li>
<li>Ovarian carcinoma, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/ovarian-cancer/">Ovarian cancer</a></li>
<li>Ovarian dysgenesis with sensorineural deafness, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/perrault-syndrome/">Perrault syndrome</a></li>
<li>Owren disease, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/factor-v-deficiency/">Factor V deficiency</a></li>
<li>Owren&#x27;s disease, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/factor-v-deficiency/">Factor V deficiency</a></li>
<li>Oxalosis, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/primary-hyperoxaluria/">Primary hyperoxaluria</a></li>
<li>Oxaluria, primary, <i>see</i> <a href="https://medlineplus.gov/genetics/condition/primary-hyperoxaluria/">Primary hyperoxaluria</a></li>
</ul>
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