{"Name":"Maternally-inherited Leigh syndrome","DiseaseID__c":"GARD:0003671","id":3671,"encodedName":"maternally-inherited-leigh-syndrome","IsDeleted":false,"Disease_Name_Full__c":"Maternally-inherited Leigh syndrome","Xref_IDs__c":"717052002; C2931092; C536035; MEDGEN:443976; MONDO:0016814; OMIM:500017; ORPHA:255210","USA_Estimate__c":null,"No_of_Specialist_Tagsa__c":4,"No_of_ClinGen_records__c":0,"No_of_GeneReviews__c":0,"No_of_HHS_records__c":0,"World_Estimate__c":null,"No_of_HRSA_records__c":0,"Evidence_Based_Score__c":0,"No_of_Disease_Descriptions__c":3,"Disease_Characteristics_Score__c":8,"No_of_Age_at_Onset__c":2,"Description_Source__c":"MONDO:0016814","Disease_Description__c":"Maternally inherited Leigh syndrome is a rare subtype of Leigh syndrome (see this term) characterized clinically by encephalopathy, lactic acidosis, seizures, cardiomyopathy, respiratory disorders and developmental delay, with onset in infancy or early childhood, and resulting from maternally-inherited mutations in mitochondrial DNA.","GARD_Name__c":"Maternally-inherited Leigh syndrome","GARD_Synonym__c":"maternally inherited infantile subacute necrotizing encephalopathy; maternally inherited leigh disease; maternally inherited leigh syndrome; maternally-inherited infantile subacute necrotizing encephalopathy; maternally-inherited leigh disease; mils; mitochondrial dna-associated leigh syndrome; mtdna-associated leigh syndrome","Curated_Disease_Description_Source__c":"GARD:0003671","Curated_Disease_Description__c":"Mitochondrial DNA-associated Leigh syndrome is a progressive brain disorder that usually appears in infancy or early childhood. Affected children may experience vomiting, seizures, delayed development, muscle weakness, and problems with movement. Heart disease, kidney problems, and difficulty breathing can also occur in people with this disorder. Mitochondrial DNA-associated Leigh syndrome is a subtype of Leigh syndrome and is caused by changes in mitochondrial DNA. Genetic changes in at least 11 mitochondrial genes have been found to cause mtDNA-associated Leigh syndrome. This condition has an inheritance pattern known as maternal or mitochondrial inheritance. Because mitochondria can be passed from one generation to the next only through egg cells (not through sperm cells), only females pass Mitochondrial DNA-associated Leigh syndrome to their children.","Curated_USA_Estimate_Source__c":null,"Curated_USA_Estimate__c":null,"Age_at_Onset_Snippet_Text__c":"as an Infant and as a Child","SourceID__c":"ORPHA:255210","Deprecated__c":"No","Disease_Concept_Type__c":"Rare Disease Entity","MONDO_ID__c":"MONDO:0016814","ORPHANET_ID__c":"ORPHA:255210","Replaced_By_ID__c":null,"Display_Spanish_Disease_Name__c":"Síndrome de leigh asociado al adn mitocondrial","Spanish_Description_Source__c":"ORPHA:255210","Spanish_Description__c":"El síndrome de Leigh de herencia materna es un subtipo poco frecuente del síndrome de Leigh (consulte este término), clínicamente caracterizado por encefalopatía, acidosis láctica, convulsiones, miocardiopatía, trastornos respiratorios y retraso en el desarrollo, con aparición en la infancia o la niñez temprana. Está causado por mutaciones en el ADN mitocondrial heredadas por vía materna.","Spanish_Disease_Name__c":"síndrome de leigh asociado al adn mitocondrial","Spanish_GARD_Synonym__c":"encefalopatía necrotizante subaguda infantil de herencia materna; enfermedad de leigh de herencia materna; mils; síndrome de leigh asociado al adnmt","Category_Linearization__c":"ORPHA:68367","icd10_id__c":null,"mesh_id__c":null,"omim_id__c":null,"snomed_id__c":null,"umls_id__c":null,"GARD_Disease__c":[{"Curated_Disease_Description__c":"Mitochondrial DNA-associated Leigh syndrome is a progressive brain disorder that usually appears in infancy or early childhood. Affected children may experience vomiting, seizures, delayed development, muscle weakness, and problems with movement. Heart disease, kidney problems, and difficulty breathing can also occur in people with this disorder. Mitochondrial DNA-associated Leigh syndrome is a subtype of Leigh syndrome and is caused by changes in mitochondrial DNA. Genetic changes in at least 11 mitochondrial genes have been found to cause mtDNA-associated Leigh syndrome. This condition has an inheritance pattern known as maternal or mitochondrial inheritance. Because mitochondria can be passed from one generation to the next only through egg cells (not through sperm cells), only females pass Mitochondrial DNA-associated Leigh syndrome to their children.","Curated_Disease_Description_Source__c":"GARD:0003671","GARD_Synonym__c":"maternally inherited infantile subacute necrotizing encephalopathy; maternally inherited leigh disease; maternally inherited leigh syndrome; maternally-inherited infantile subacute necrotizing encephalopathy; maternally-inherited leigh disease; mils; mitochondrial dna-associated leigh syndrome; mtdna-associated leigh syndrome","Name":"Maternally-inherited Leigh syndrome","estimateUsa":""}],"Organization_Supported_Diseases__c":[{"Account_Name__c":"Cure Mito Foundation","Website__c":"https://www.curemito.org/"},{"Account_Name__c":"United Mitochondrial Disease Foundation","Website__c":"https://www.umdf.org"},{"Account_Name__c":"MitoAction","Website__c":"https://www.mitoaction.org/"},{"Account_Name__c":"People Against Leigh Syndrome","Website__c":"https://www.peopleagainstleighs.org/"}],"GARD_Disease_Tag__c":[{"Tag_Name__c":"Genetics","Tag_Category__c":"Cause;Disease Category;Specialist","category_description":"Genetic diseases affect the DNA, or genetic instructions, which directs how tissues, organs, and body systems function.","curated_tag_name":"Genetic diseases"},{"Tag_Name__c":"Neurology","Tag_Category__c":"Disease Category;Specialist","category_description":"Neurological diseases affect the brain, spinal cord, cranial nerves, autonomic nerves, or other peripheral nerves.","curated_tag_name":"Neurological diseases"},{"Tag_Name__c":"Inborn Errors of Metabolism","Tag_Category__c":"Cause;Disease Category","category_description":"Inherited metabolic diseases, or inborn errors of metabolism, are a group of genetic diseases that affect the ability of the body's cells to convert food into energy.","curated_tag_name":"Inherited metabolic diseases"},{"Tag_Name__c":"Mitochondrial","Tag_Category__c":"Account;Cause;Disease Category","category_description":"Mitochondrial diseases are a group of genetic diseases that affect the ability of the body's cells to make energy.","curated_tag_name":"Mitochondrial diseases"},{"Tag_Name__c":"Neuromuscular medicine","Tag_Category__c":"Specialist","curated_tag_name":"Neuromuscular medicine"},{"Tag_Name__c":"Pediatrics","Tag_Category__c":"Specialist"}],"Age_At_Onset__c":[{"Age_At_Onset__c":"Childhood","Provided_By__c":"ORPHA:255210"},{"Age_At_Onset__c":"Infancy","Provided_By__c":"ORPHA:255210"}],"External_Identifier_Disease__c":[{"URL__c":"https://www.ncbi.nlm.nih.gov/books/NBK320989","Xref__c":"NBK320989"},{"URL__c":"https://www.ncbi.nlm.nih.gov/books/NBK1224","Xref__c":"NBK1224"},{"URL__c":"https://www.ncbi.nlm.nih.gov/books/NBK1173","Source__c":"Gene Review","Xref__c":"NBK1173"},{"URL__c":"https://www.ncbi.nlm.nih.gov/books/NBK1203","Xref__c":"NBK1203"},{"URL__c":"https://www.orpha.net/en/disease/detail/255210","Source__c":"C2931092; MONDO:0016814; ORPHA:255210","Xref__c":"ORPHA:255210"},{"URL__c":"https://browser.ihtsdotools.org/?perspective=full&conceptId1=717052002","Source__c":"C2931092; MONDO:0016814","Xref__c":"717052002"},{"URL__c":"https://www.ncbi.nlm.nih.gov/mesh/C536035","Source__c":"MONDO:0016814","Xref__c":"C536035"},{"URL__c":"https://www.ncbi.nlm.nih.gov/medgen/?term=443976","Source__c":"C2931092","Xref__c":"MEDGEN:443976"},{"URL__c":"https://uts.nlm.nih.gov/uts/umls/concept/C2931092","Source__c":"C2931092","Xref__c":"C2931092"},{"URL__c":"https://www.omim.org/entry/500017","Source__c":"C2931092; ORPHA:255210","Xref__c":"OMIM:500017"},{"URL__c":"http://purl.obolibrary.org/obo/MONDO_0016814","Source__c":"GARD:0003671","Xref__c":"MONDO:0016814"}],"GARD_Disease_Gene__c":[{"GeneSymbol__c":"MT-ND6","GHR_URL__c":"https://medlineplus.gov/genetics/gene/mt-nd6","Gene_Type__c":"protein-coding gene","Causal_Gene__c":true},{"GeneSymbol__c":"MT-TK","GHR_URL__c":"https://medlineplus.gov/genetics/gene/mt-tk","Gene_Type__c":"non-coding RNA","Causal_Gene__c":true},{"GeneSymbol__c":"MT-ATP6","GHR_URL__c":"https://medlineplus.gov/genetics/gene/mt-atp6","Gene_Type__c":"protein-coding gene","Causal_Gene__c":true},{"GeneSymbol__c":"MT-ND4","GHR_URL__c":"https://medlineplus.gov/genetics/gene/mt-nd4","Gene_Type__c":"protein-coding gene","Causal_Gene__c":true},{"GeneSymbol__c":"MT-TV","GHR_URL__c":"https://medlineplus.gov/genetics/gene/mt-tv","Gene_Type__c":"non-coding RNA","Causal_Gene__c":true},{"GeneSymbol__c":"MT-TW","Gene_Type__c":"non-coding RNA","Causal_Gene__c":true},{"GeneSymbol__c":"MT-ND1","GHR_URL__c":"https://medlineplus.gov/genetics/gene/mt-nd1","Gene_Type__c":"protein-coding gene","Causal_Gene__c":true},{"GeneSymbol__c":"MT-TL1","GHR_URL__c":"https://medlineplus.gov/genetics/gene/mt-tl1","Gene_Type__c":"non-coding RNA","Causal_Gene__c":true},{"GeneSymbol__c":"MT-ND5","GHR_URL__c":"https://medlineplus.gov/genetics/gene/mt-nd5","Gene_Type__c":"protein-coding gene","Causal_Gene__c":true},{"GeneSymbol__c":"MT-ND3","Gene_Type__c":"protein-coding gene","Causal_Gene__c":true},{"GeneSymbol__c":"MT-ND2","Gene_Type__c":"protein-coding gene","Causal_Gene__c":true}],"Inheritance__c":["Mitochondrial inheritance"],"GARD_Disease_Feature__c":[{"Provided_By__c":"ORPHA:255210","HPO_Frequency__c":"Frequent (30-79%)","Feature__r":{"HPO_Description__c":"An abnormality of the retina characterized by pigment deposition. It is typically associated with migration and proliferation of macrophages or retinal pigment epithelial cells into the retina; melanin from these cells causes the pigmentary changes. Pigmentary retinopathy is a common final pathway of many retinal conditions and is often associated with visual loss.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0000580","HPO_Synonym__c":"Pigmentary retinal deposits; Retinal pigment clumping; Retinal pigmentary clumping; Retinal pigmentary degeneration","HPO_Name__c":"Pigmentary retinopathy","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:255210","HPO_Frequency__c":"Occasional (5-29%)","Feature__r":{"HPO_Description__c":"Body temperature elevated above the normal range.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0001945","HPO_Synonym__c":"Fever; Hyperthermia; Pyrexia","HPO_Name__c":"Fever","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:255210","HPO_Frequency__c":"Frequent (30-79%)","Feature__r":{"HPO_Description__c":"Ophthalmoplegia is a paralysis or weakness of one or more of the muscles that control eye movement.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0000597","HPO_Synonym__c":"Extraocular muscle palsy; Extraocular muscle paralysis; Weakness of extraocular eye movement; Weakness of muscles controlling eye movement","HPO_Name__c":"Ophthalmoparesis","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:255210","HPO_Frequency__c":"Frequent (30-79%)","Feature__r":{"HPO_Description__c":"Reduced strength of muscles.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0001324","HPO_Synonym__c":"Muscle weakness; Muscular weakness","HPO_Name__c":"Muscle weakness","Feature_System__c":"Musculoskeletal System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:255210","HPO_Frequency__c":"Occasional (5-29%)","Feature__r":{"HPO_Description__c":"Difficulty in swallowing.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0002015","HPO_Synonym__c":"Difficulty swallowing; Poor swallowing; Swallowing difficulties; Swallowing difficulty","HPO_Name__c":"Dysphagia","Feature_System__c":"Nervous System; Digestive System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:255210","HPO_Frequency__c":"Occasional (5-29%)","Feature__r":{"HPO_Description__c":"Reduction of neurologic reflexes such as the knee-jerk reaction.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0001265","HPO_Synonym__c":"Decreased reflex response; Decreased reflexes","HPO_Name__c":"Hyporeflexia","Feature_System__c":"Nervous System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:255210","HPO_Frequency__c":"Occasional (5-29%)","Feature__r":{"HPO_Description__c":"Atrophy of the optic nerve. Optic atrophy results from the death of the retinal ganglion cell axons that comprise the optic nerve and manifesting as a pale optic nerve on fundoscopy.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0000648","HPO_Synonym__c":"Optic nerve atrophy; Optic-nerve degeneration","HPO_Name__c":"Optic atrophy","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:255210","HPO_Frequency__c":"Occasional (5-29%)","Feature__r":{"HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0004885","HPO_Synonym__c":"Episodic difficulty breathing; respiratory distress, episodic","HPO_Name__c":"Episodic respiratory distress","Feature_System__c":"Respiratory system","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:255210","HPO_Frequency__c":"Occasional (5-29%)","Feature__r":{"HPO_Description__c":"Hyperreflexia is the presence of hyperactive stretch reflexes of the muscles.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0001347","HPO_Synonym__c":"Increased deep tendon reflexes; Increased reflexes","HPO_Name__c":"Hyperreflexia","Feature_System__c":"Nervous System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:255210","HPO_Frequency__c":"Frequent (30-79%)","Feature__r":{"HPO_Description__c":"Floppiness/hypotonia is defined as reduced resistance to passive movement of joints. Physical examination of floppy/hypotonic infants shows head lag, lack of shoulder and elbow muscle contraction on traction response, inability to tighten the shoulder girdle muscles (or slipping through) when held under the axillae, scarf sign (when the arm is pulled to the opposite side, the arm wraps around the neck with the elbow crossing midline), hyperdorsiflexion of the feet, easy apposition of the thumb against the forearm, feet touching the cheek with ease and without discomfort, frog leg position, and inverted U sign on ventral suspension (head, arms, and legs hanging down without elbow or knee flexion and the trunk rounded in a dome shape).","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0008947","HPO_Synonym__c":"Decreased muscle tone in infant; Hypotonia early; Hypotonia in infancy; Hypotonia, early; Infantile hypotonia; Infantile muscular hypotonia","HPO_Name__c":"Floppy infant","Feature_System__c":"Musculoskeletal System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:255210","HPO_Frequency__c":"Occasional (5-29%)","Feature__r":{"HPO_Description__c":"An inherited retinal disease subtype in which the rod photoreceptors appear to be more severely affected than the cone photoreceptors. Typical presentation is with nyctalopia (due to rod dysfunction) followed by loss of mid-peripheral field of vision, which gradually extends and leaves many patients with a small central island of vision due to the preservation of macular cones.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0000510","HPO_Synonym__c":"Retinitis pigmentosa; Rod cone dystrophy","HPO_Name__c":"Rod-cone dystrophy","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:255210","HPO_Frequency__c":"Uncommon (<1-4%)","Feature__r":{"HPO_Description__c":"An abnormal appearance of muscle fibers observed on muscle biopsy. Ragged red fibers can be visualized with Gomori trichrome staining as irregular and intensely red subsarcolemmal zones, whereas the normal myofibrils are green. The margins of affect fibers appear red and ragged. The ragged-red is due to the accumulation of abnormal mitochondria below the plasma membrane of the muscle fiber, leading to the appearance of a red rim and speckled sarcoplasm.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0003200","HPO_Synonym__c":"Mitochondrial proliferation in muscle tissue; Ragged red muscle fibers; Ragged-red fibers","HPO_Name__c":"Ragged-red muscle fibers","Feature_System__c":"Musculoskeletal System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:255210","HPO_Frequency__c":"Frequent (30-79%)","Feature__r":{"HPO_Description__c":"Failure to thrive (FTT) refers to a child whose physical growth is substantially below the norm.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0001508","HPO_Synonym__c":"Faltering weight; FTT; Postnatal failure to thrive; Weight faltering","HPO_Name__c":"Failure to thrive","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:255210","HPO_Frequency__c":"Uncommon (<1-4%)","Feature__r":{"HPO_Description__c":"A decreased concentration of citrulline in the blood.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0003572","HPO_Name__c":"Low plasma citrulline","HPO_Feature_Type__c":"Lab"}},{"Provided_By__c":"ORPHA:255210","HPO_Frequency__c":"Frequent (30-79%)","Feature__r":{"HPO_Description__c":"Chorea (Greek for 'dance') refers to widespread arrhythmic involuntary movements of a forcible, jerky and restless fashion. It is a random-appearing sequence of one or more discrete involuntary movements or movement fragments. Movements appear random because of variability in timing, duration or location. Each movement may have a distinct start and end. However, movements may be strung together and thus may appear to flow randomly from one muscle group to another. Chorea can involve the trunk, neck, face, tongue, and extremities.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0002072","HPO_Synonym__c":"Choreic movements; Choreiform movements","HPO_Name__c":"Chorea","Feature_System__c":"Nervous System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:255210","HPO_Frequency__c":"Frequent (30-79%)","Feature__r":{"HPO_Description__c":"Abnormally increased level of blood lactate (2-hydroxypropanoic acid). Lactate is produced from pyruvate by lactate dehydrogenase during normal metabolism. The terms lactate and lactic acid are often used interchangeably but lactate (the component measured in blood) is strictly a weak base whereas lactic acid is the corresponding acid. Lactic acidosis is often used clinically to describe elevated lactate but should be reserved for cases where there is a corresponding acidosis (pH below 7.35).","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0002151","HPO_Synonym__c":"Increased blood lactate; Increased serum lactate","HPO_Name__c":"Increased circulating lactate concentration","HPO_Feature_Type__c":"Lab"}},{"Provided_By__c":"ORPHA:255210","HPO_Frequency__c":"Occasional (5-29%)","Feature__r":{"HPO_Description__c":"Any anomaly of the progression of electrical impulses through the heart.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0031546","HPO_Synonym__c":"Abnormality of cardiac conduction; Abnormality of cardiac conduction system; Cardiac conduction abnormalities; Cardiac conduction defects; Heart conduction disorder","HPO_Name__c":"Cardiac conduction abnormality","Feature_System__c":"Cardiovascular System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:255210","HPO_Frequency__c":"Very frequent (80-99%)","Feature__r":{"HPO_Description__c":"An abnormality of the tricarboxylic acid cycle.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0000816","HPO_Synonym__c":"Abnormality of citric acid cycle; Abnormality of the tricarboxylic cycle","HPO_Name__c":"Abnormality of Krebs cycle metabolism","HPO_Feature_Type__c":"Lab"}},{"Provided_By__c":"ORPHA:255210","HPO_Frequency__c":"Occasional (5-29%)","Feature__r":{"HPO_Description__c":"An abnormality of the renal tubules.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0000091","HPO_Synonym__c":"Abnormality of the renal tubule; Morphologic abnormality of the renal tubules","HPO_Name__c":"Abnormal renal tubule morphology","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:255210","HPO_Frequency__c":"Occasional (5-29%)","Feature__r":{"HPO_Description__c":"Loss of developmental skills, as manifested by loss of developmental milestones.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0002376","HPO_Synonym__c":"Loss of acquired milestones; Loss of developmental milestones; Loss of milestones; Mental deterioration in childhood; Neurodevelopmental regression; Psychomotor regression; Psychomotor regression beginning in infancy; Psychomotor regression in infants; Psychomotor regression, progressive","HPO_Name__c":"Developmental regression","Feature_System__c":"Nervous System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:255210","HPO_Frequency__c":"Frequent (30-79%)","Feature__r":{"HPO_Description__c":"An increased concentration of lactic acid in the urine.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0003648","HPO_Synonym__c":"High urine lactic acid levels; Increased urine lactate","HPO_Name__c":"Lacticaciduria","HPO_Feature_Type__c":"Lab"}},{"Provided_By__c":"ORPHA:255210","HPO_Frequency__c":"Frequent (30-79%)","Feature__r":{"HPO_Description__c":"A bilateral tonic-clonic seizure is a seizure defined by a tonic (bilateral increased tone, lasting seconds to minutes) and then a clonic (bilateral sustained rhythmic jerking) phase.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0002069","HPO_Synonym__c":"Bilateral convulsive seizures; Generalised tonic-clonic seizure (without specification of onset); Generalized convulsion; Generalized tonic-clonic seizure (without specification of onset); Grand mal; Grand mal seizures; Seizures, tonic-clonic; Tonic-clonic convulsion; Tonic-clonic convulsions","HPO_Name__c":"Bilateral tonic-clonic seizure","Feature_System__c":"Nervous System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:255210","HPO_Frequency__c":"Occasional (5-29%)","Feature__r":{"HPO_Description__c":"A segmental pattern of demyelination and regeneration (remyelination) affecting peripheral nerves.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0003481","HPO_Synonym__c":"Segmental demyelination/remyelination","HPO_Name__c":"Segmental peripheral demyelination/remyelination","Feature_System__c":"Nervous System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:255210","HPO_Frequency__c":"Occasional (5-29%)","Feature__r":{"HPO_Description__c":"Hyperventilation refers to an increased pulmonary ventilation rate that is faster than necessary for the exchange of gases. Hyperventilation can result from increased frequency of breathing, an increased tidal volume, or both, and leads to an excess intake of oxygen and the blowing off of carbon dioxide.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0002883","HPO_Synonym__c":"Rapid breathing","HPO_Name__c":"Hyperventilation","Feature_System__c":"Respiratory system","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:255210","HPO_Frequency__c":"Frequent (30-79%)","Feature__r":{"HPO_Description__c":"A movement disorder which consists of effects including diminished voluntary movements and the presence of involuntary movements.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0100660","HPO_Synonym__c":"Disorder of involuntary muscle movements; Dyskinesis","HPO_Name__c":"Dyskinesia","Feature_System__c":"Nervous System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:255210","HPO_Frequency__c":"Occasional (5-29%)","Feature__r":{"HPO_Description__c":"Lack of breathing with no movement of the respiratory muscles and no exchange of air in the lungs. This term refers to a disposition to have recurrent episodes of apnea rather than to a single event.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0002104","HPO_Synonym__c":"Absence of spontaneous respiration; Apneic episodes; Apnoea","HPO_Name__c":"Apnea","Feature_System__c":"Respiratory system","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:255210","HPO_Frequency__c":"Frequent (30-79%)","Feature__r":{"HPO_Description__c":"A motor disorder characterized by a velocity-dependent increase in tonic stretch reflexes with increased muscle tone, exaggerated (hyperexcitable) tendon reflexes.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0001257","HPO_Synonym__c":"Involuntary muscle stiffness, contraction, or spasm; Muscle spasticity; Muscular spasticity","HPO_Name__c":"Spasticity","Feature_System__c":"Nervous System; Musculoskeletal System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:255210","HPO_Frequency__c":"Frequent (30-79%)","Feature__r":{"HPO_Description__c":"A severe delay in the achievement of motor or mental milestones in the domains of development of a child.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0011344","HPO_Synonym__c":"Global developmental delay, severe","HPO_Name__c":"Severe global developmental delay","Feature_System__c":"Nervous System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:255210","HPO_Frequency__c":"Occasional (5-29%)","Feature__r":{"HPO_Description__c":"Abnormally increased size of the liver.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0002240","HPO_Synonym__c":"Enlarged liver","HPO_Name__c":"Hepatomegaly","Feature_System__c":"Digestive System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:255210","HPO_Frequency__c":"Frequent (30-79%)","Feature__r":{"HPO_Description__c":"A generalized myoclonic seizure is a type of generalized motor seizure characterized by bilateral, sudden, brief (<100 ms) involuntary single or multiple contraction of muscles or muscle groups of variable topography (axial, proximal limb, distal). Myoclonus is less regularly repetitive and less sustained than is clonus.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0002123","HPO_Synonym__c":"Generalised epileptic myoclonus; Generalised myoclonic seizure; Generalized epileptic myoclonus; Generalized myoclonic seizures; Myoclonus seizures","HPO_Name__c":"Generalized myoclonic seizure","Feature_System__c":"Nervous System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:255210","HPO_Frequency__c":"Occasional (5-29%)","Feature__r":{"HPO_Description__c":"The presence of many cysts in the glomerulus of the kidney related to dilatation of the Bowman's capsule.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0100611","HPO_Name__c":"Multiple glomerular cysts","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:255210","HPO_Frequency__c":"Frequent (30-79%)","Feature__r":{"HPO_Description__c":"A condition in which there is increased muscle tone so that arms or legs, for example, are stiff and difficult to move.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0001276","HPO_Synonym__c":"Hypertonicity; Increased muscle tone","HPO_Name__c":"Hypertonia","Feature_System__c":"Musculoskeletal System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:255210","HPO_Frequency__c":"Occasional (5-29%)","Feature__r":{"HPO_Description__c":"Prosody refers to the patterns of rhythm, stress, and intonation in spoken language. Abnormal prosody refers to abnormalities in the patterns of rhythm, stress, or intonation of speech or vocalization that can be heard by the observer. In general, this refers to overt and clear deviations in patterns from culturally accepted norms but many also include differences noted in comparison to the usual patterns of the individual (a quiet person suddenly becomes loud or vice versa).","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0031434","HPO_Name__c":"Abnormal prosody","Feature_System__c":"Nervous System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:255210","HPO_Frequency__c":"Occasional (5-29%)","Feature__r":{"HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0002483","HPO_Name__c":"Bulbar signs","Feature_System__c":"Nervous System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:255210","HPO_Frequency__c":"Frequent (30-79%)","Feature__r":{"HPO_Description__c":"A type of ataxia characterized by the impairment of the ability to coordinate the movements required for normal walking. Gait ataxia is characteirzed by a wide-based staggering gait with a tendency to fall.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0002066","HPO_Synonym__c":"Ataxia of gait; Ataxic gait; Inability to coordinate movements when walking","HPO_Name__c":"Gait ataxia","Feature_System__c":"Nervous System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:255210","HPO_Frequency__c":"Frequent (30-79%)","Feature__r":{"HPO_Description__c":"A seizure is an intermittent abnormality of nervous system physiology characterized by a transient occurrence of signs and/or symptoms due to abnormal excessive or synchronous neuronal activity in the brain.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0001250","HPO_Synonym__c":"Epileptic seizure; Seizures","HPO_Name__c":"Seizure","Feature_System__c":"Nervous System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:255210","HPO_Frequency__c":"Occasional (5-29%)","Feature__r":{"HPO_Description__c":"Dilated cardiomyopathy (DCM) is defined by the presence of left ventricular dilatation and left ventricular systolic dysfunction in the absence of abnormal loading conditions (hypertension, valve disease) or coronary artery disease sufficient to cause global systolic impairment. Right ventricular dilation and dysfunction may be present but are not necessary for the diagnosis.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0001644","HPO_Synonym__c":"Cardiomyopathy, dilated; Congestive cardiomyopathy; DCM; Stretched and thinned heart muscle","HPO_Name__c":"Dilated cardiomyopathy","Feature_System__c":"Cardiovascular System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:255210","HPO_Frequency__c":"Very frequent (80-99%)","Feature__r":{"HPO_Description__c":"Increased concentration of lactate in the cerebrospinal fluid.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0002490","HPO_Synonym__c":"Hyperlactatorachia; Increased cerebrospinal fluid lactate; Increased CSF lactic acid","HPO_Name__c":"Increased CSF lactate","Feature_System__c":"Nervous System","HPO_Feature_Type__c":"Lab"}},{"Provided_By__c":"ORPHA:255210","HPO_Frequency__c":"Frequent (30-79%)","Feature__r":{"HPO_Description__c":"A lighter than expected T2 signal on magnetic resonance imaging (MRI) of the basal ganglia. This term refers to a localized hyperintensity affecting a particular region of the basal ganglia.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0007183","HPO_Name__c":"Focal T2 hyperintense basal ganglia lesion","Feature_System__c":"Nervous System","HPO_Feature_Type__c":"Imaging_MRI"}},{"Provided_By__c":"ORPHA:255210","HPO_Frequency__c":"Occasional (5-29%)","Feature__r":{"HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0001399","HPO_Synonym__c":"Hepatic insufficiency; Liver failure","HPO_Name__c":"Hepatic failure","Feature_System__c":"Digestive System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:255210","HPO_Frequency__c":"Occasional (5-29%)","Feature__r":{"HPO_Description__c":"Infantile spasms represent a subset of \\\"epileptic spasms\\\". Infantile Spasms are epileptic spasms starting in the first year of life (infancy).","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0012469","HPO_Name__c":"Infantile spasms","Feature_System__c":"Nervous System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:255210","HPO_Frequency__c":"Frequent (30-79%)","Feature__r":{"HPO_Description__c":"Paroxysmal, recurrent episodes of vomiting.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0002572","HPO_Synonym__c":"Episodic vomiting","HPO_Name__c":"Episodic vomiting","Feature_System__c":"Digestive System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:255210","HPO_Frequency__c":"Occasional (5-29%)","Feature__r":{"HPO_Description__c":"An increased concentration of alanine in the blood.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0003348","HPO_Synonym__c":"Increased blood alanine; Increased serum alanine","HPO_Name__c":"Hyperalaninemia","HPO_Feature_Type__c":"Lab"}},{"Provided_By__c":"ORPHA:255210","HPO_Frequency__c":"Frequent (30-79%)","Feature__r":{"HPO_Description__c":"An abnormally increased muscular tone that causes fixed abnormal postures. There is a slow, intermittent twisting motion that leads to exaggerated turning and posture of the extremities and trunk.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0001332","HPO_Synonym__c":"Dystonic movements","HPO_Name__c":"Dystonia","Feature_System__c":"Nervous System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:255210","HPO_Frequency__c":"Occasional (5-29%)","Feature__r":{"HPO_Description__c":"A type of hearing impairment in one or both ears related to an abnormal functionality of the cochlear nerve.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0000407","HPO_Synonym__c":"Hearing loss, sensorineural; Sensorineural deafness; Sensorineural hearing loss","HPO_Name__c":"Sensorineural hearing impairment","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:255210","HPO_Frequency__c":"Occasional (5-29%)","Feature__r":{"HPO_Description__c":"Rhythmic, involuntary oscillations of one or both eyes related to abnormality in fixation, conjugate gaze, or vestibular mechanisms.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0000639","HPO_Synonym__c":"Involuntary, rapid, rhythmic eye movements","HPO_Name__c":"Nystagmus","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:255210","HPO_Frequency__c":"Frequent (30-79%)","Feature__r":{"HPO_Description__c":"Ataxia refers to impaired coordination of voluntary muscle movement. Cerebellar ataxia refers to ataxia due to dysfunction of the cerebellum. This causes a variety of elementary neurological deficits including asynergy (lack of coordination between muscles, limbs and joints), dysmetria (lack of ability to judge distances that can lead to under- or overshoot in grasping movements), and dysdiadochokinesia (inability to perform rapid movements requiring antagonizing muscle groups to be switched on and off repeatedly).","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0001251","HPO_Synonym__c":"Cerebellar ataxia","HPO_Name__c":"Ataxia","Feature_System__c":"Nervous System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:255210","HPO_Frequency__c":"Frequent (30-79%)","Feature__r":{"HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0007141","HPO_Synonym__c":"Mixed polyneuropathy; Nerve damage causing decreased feeling and movement; Sensorimotor peripheral neuropathy","HPO_Name__c":"Sensorimotor neuropathy","Feature_System__c":"Nervous System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:255210","HPO_Frequency__c":"Occasional (5-29%)","Feature__r":{"HPO_Description__c":"Demyelinating neuropathy is characterized by slow nerve conduction velocities with reduced amplitudes of sensory/motor nerve conduction and prolonged distal latencies.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0007108","HPO_Name__c":"Demyelinating peripheral neuropathy","Feature_System__c":"Nervous System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:255210","HPO_Frequency__c":"Occasional (5-29%)","Feature__r":{"HPO_Description__c":"Reduced body temperature due to failed thermoregulation.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0002045","HPO_Synonym__c":"Abnormally low body temperature; Hypothermia","HPO_Name__c":"Hypothermia","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:255210","HPO_Frequency__c":"Occasional (5-29%)","Feature__r":{"HPO_Description__c":"Difficult or labored breathing. Dyspnea is a subjective feeling only the patient can rate, e.g., on a Borg scale.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0002094","HPO_Synonym__c":"Abnormal breathing; Breathing difficulty; Difficult to breathe; Difficulty breathing; Shortness of breath; Trouble breathing","HPO_Name__c":"Dyspnea","Feature_System__c":"Respiratory system","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:255210","HPO_Frequency__c":"Occasional (5-29%)","Feature__r":{"HPO_Description__c":"Hypertrophic cardiomyopathy (HCM) is defined by the presence of increased ventricular wall thickness or mass in the absence of loading conditions (hypertension, valve disease) sufficient to cause the observed abnormality.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0001639","HPO_Synonym__c":"Cardiomyopathy, hypertrophic; Enlarged and thickened heart muscle; HCM","HPO_Name__c":"Hypertrophic cardiomyopathy","Feature_System__c":"Cardiovascular System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:255210","HPO_Frequency__c":"Occasional (5-29%)","Feature__r":{"HPO_Description__c":"A type of myopathy associated with mitochondrial disease and characterized by findings on biopsy such as ragged red muscle fibers.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0003737","HPO_Name__c":"Mitochondrial myopathy","Feature_System__c":"Musculoskeletal System","HPO_Feature_Type__c":"Symptom"}}],"tags":{"Cause":["Genetics","Inborn Errors of Metabolism","Mitochondrial"],"Disease Category":["Genetics","Neurology","Inborn Errors of Metabolism","Mitochondrial"],"Specialist":["Genetics","Neurology","Neuromuscular medicine","Pediatrics"],"Account":["Mitochondrial"]},"synonyms":["maternally inherited infantile subacute necrotizing encephalopathy"," maternally inherited leigh disease"," maternally inherited leigh syndrome"," maternally-inherited infantile subacute necrotizing encephalopathy"," maternally-inherited leigh disease"," mils"," mitochondrial dna-associated leigh syndrome"," mtdna-associated leigh syndrome"]}