{"Name":"Mitochondrial DNA depletion syndrome, myopathic form","DiseaseID__c":"GARD:0017228","id":17228,"encodedName":"mitochondrial-dna-depletion-syndrome-myopathic-form","IsDeleted":false,"Disease_Name_Full__c":"Mitochondrial DNA depletion syndrome, myopathic form","Xref_IDs__c":"703527003; C185236; C3149750; C563698; DOID:0080120; MEDGEN:461100; MONDO:0012301; OMIM:609560; ORPHA:254875","USA_Estimate__c":"1,000","No_of_Specialist_Tagsa__c":5,"No_of_ClinGen_records__c":0,"No_of_GeneReviews__c":0,"No_of_HHS_records__c":1,"World_Estimate__c":"1 to 8,000","No_of_HRSA_records__c":0,"Evidence_Based_Score__c":1,"No_of_Disease_Descriptions__c":3,"Disease_Characteristics_Score__c":8,"No_of_Age_at_Onset__c":2,"Description_Source__c":"MONDO:0012301","Disease_Description__c":"A rare mitochondrial DNA depletion syndrome characterized by muscle weakness, and progressive, generalized hypotonia due to depletion of mtDNA in skeletal muscles. Clinical progression ranges from rapid and early fatal course due to respiratory failure, to slowly progressive myopathy over the course of childhood or even early adulthood.","GARD_Name__c":"Mitochondrial DNA depletion syndrome, myopathic form","GARD_Synonym__c":"mitochondrial dna depletion myopathy, tk2-related; mitochondrial dna depletion syndrome 2 (myopathic type); mitochondrial dna depletion syndrome 2 myopathic type; mitochondrial dna depletion syndrome type 2; mtdna depletion syndrome, myopathic form; mtdps2; tk2-related mitochondrial deoxyribonucleic acid depletion syndrome myopathic form; tk2-related mitochondrial dna depletion myopathy; tk2-related mitochondrial dna depletion syndrome myopathic form; tk2-related mitochondrial dna depletion syndrome, myopathic form","Curated_Disease_Description_Source__c":"MONDO:0012301","Curated_Disease_Description__c":"TK2-related mitochondrial DNA depletion syndrome, myopathic form (TK2-MDS) is an inherited condition that causes progressive muscle weakness (myopathy). The signs and symptoms of TK2-MDS typically begin in early childhood. Development is usually normal early in life, but as muscle weakness progresses, people with TK2-MDS lose motor skills such as standing, walking, eating, and talking. Some affected individuals have increasing weakness in the muscles that control eye movement, leading to droopy eyelids (progressive external ophthalmoplegia). Most often in TK2-MDS, the muscles are the only affected tissues; however, the liver may be enlarged (hepatomegaly), seizures can occur, and hearing loss caused by nerve damage in the inner ear (sensorineural hearing loss) may be present. Intelligence is usually not affected. As the disorder worsens, the muscles that control breathing become weakened and affected individuals frequently have to rely on mechanical ventilation. Respiratory failure is the most common cause of death in people with TK2-MDS, often occurring in childhood. Rarely, the disorder progresses slowly and affected individuals survive into adolescence or adulthood.","Curated_USA_Estimate_Source__c":null,"Curated_USA_Estimate__c":"1,000","Age_at_Onset_Snippet_Text__c":"as a Newborn and as an Infant","SourceID__c":"ORPHA:254875","Deprecated__c":"No","Disease_Concept_Type__c":"Rare Disease Entity","MONDO_ID__c":"MONDO:0012301","ORPHANET_ID__c":"ORPHA:254875","Replaced_By_ID__c":null,"Display_Spanish_Disease_Name__c":"Síndrome de depleción del adn mitocondrial, forma miopática","Spanish_Description_Source__c":"ORPHA:254875","Spanish_Description__c":"Es un síndrome poco frecuente de depleción del ADN mitocondrial caracterizado por debilidad muscular e hipotonía progresiva y generalizada debido a la depleción del ADNmt en el músculo esquelético. La progresión clínica varía desde un curso rápido y fatal precoz debido a la insuficiencia respiratoria hasta una miopatía de progresión lenta en el transcurso de la infancia o incluso en la edad adulta temprana.","Spanish_Disease_Name__c":"síndrome de depleción del adn mitocondrial, forma miopática","Spanish_GARD_Synonym__c":"síndrome de depleción del adnmt, forma miopática","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":"TK2-related mitochondrial DNA depletion syndrome, myopathic form (TK2-MDS) is an inherited condition that causes progressive muscle weakness (myopathy). The signs and symptoms of TK2-MDS typically begin in early childhood. Development is usually normal early in life, but as muscle weakness progresses, people with TK2-MDS lose motor skills such as standing, walking, eating, and talking. Some affected individuals have increasing weakness in the muscles that control eye movement, leading to droopy eyelids (progressive external ophthalmoplegia). Most often in TK2-MDS, the muscles are the only affected tissues; however, the liver may be enlarged (hepatomegaly), seizures can occur, and hearing loss caused by nerve damage in the inner ear (sensorineural hearing loss) may be present. Intelligence is usually not affected. As the disorder worsens, the muscles that control breathing become weakened and affected individuals frequently have to rely on mechanical ventilation. Respiratory failure is the most common cause of death in people with TK2-MDS, often occurring in childhood. Rarely, the disorder progresses slowly and affected individuals survive into adolescence or adulthood.","Curated_Disease_Description_Source__c":"MONDO:0012301","GARD_Synonym__c":"mitochondrial dna depletion myopathy, tk2-related; mitochondrial dna depletion syndrome 2 (myopathic type); mitochondrial dna depletion syndrome 2 myopathic type; mitochondrial dna depletion syndrome type 2; mtdna depletion syndrome, myopathic form; mtdps2; tk2-related mitochondrial deoxyribonucleic acid depletion syndrome myopathic form; tk2-related mitochondrial dna depletion myopathy; tk2-related mitochondrial dna depletion syndrome myopathic form; tk2-related mitochondrial dna depletion syndrome, myopathic form","Name":"Mitochondrial DNA depletion syndrome, myopathic form","Curated_USA_Estimate__c":"1,000","estimateUsa":"1,000"}],"Organization_Supported_Diseases__c":[{"Account_Name__c":"United Mitochondrial Disease Foundation","Website__c":"https://www.umdf.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":"Gastroenterology","Tag_Category__c":"Disease Category;Specialist","category_description":"Gastrointestinal diseases, or digestive diseases, affect the esophagus, stomach, small intestine, large intestine, liver, gallbladder, or pancreas.","curated_tag_name":"Gastrointestinal 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":"Neonatal","Provided_By__c":"ORPHA:254875"},{"Age_At_Onset__c":"Infancy","Provided_By__c":"ORPHA:254875"}],"External_Identifier_Disease__c":[{"URL__c":"https://www.ncbi.nlm.nih.gov/books/NBK114628","Source__c":"Gene Review","Xref__c":"NBK114628"},{"URL__c":"https://www.ncbi.nlm.nih.gov/medgen/?term=461100","Source__c":"C3149750","Xref__c":"MEDGEN:461100"},{"URL__c":"https://www.ebi.ac.uk/ols4/ontologies/doid/classes?obo_id=DOID%3A0080120","Source__c":"MONDO:0012301","Xref__c":"DOID:0080120"},{"URL__c":"https://www.omim.org/entry/609560","Source__c":"C3149750; MONDO:0012301; ORPHA:254875","Xref__c":"OMIM:609560"},{"URL__c":"https://www.orpha.net/en/disease/detail/254875","Source__c":"C3149750; MONDO:0012301","Xref__c":"ORPHA:254875"},{"URL__c":"https://browser.ihtsdotools.org/?perspective=full&conceptId1=703527003","Source__c":"C3149750; MONDO:0012301","Xref__c":"703527003"},{"URL__c":"https://www.ncbi.nlm.nih.gov/mesh/C563698","Source__c":"MONDO:0012301","Xref__c":"C563698"},{"URL__c":"https://uts.nlm.nih.gov/uts/umls/concept/C3149750","Source__c":"C3149750","Xref__c":"C3149750"},{"URL__c":"http://purl.obolibrary.org/obo/MONDO_0012301","Source__c":"GARD:0017228","Xref__c":"MONDO:0012301"},{"URL__c":"https://evsexplore.semantics.cancer.gov/evsexplore/concept/ncit/C185236","Source__c":"C3149750","Xref__c":"C185236"},{"URL__c":"https://medlineplus.gov/genetics/condition/tk2-related-mitochondrial-dna-depletion-syndrome-myopathic-form","Source__c":"GARD:0017228","Xref__c":"https://medlineplus.gov/genetics/condition/tk2-related-mitochondrial-dna-depletion-syndrome-myopathic-form"}],"GARD_Disease_Gene__c":[{"GeneSymbol__c":"TK2","GHR_URL__c":"https://medlineplus.gov/genetics/gene/tk2","Gene_Type__c":"protein-coding gene","Causal_Gene__c":true}],"Inheritance__c":["Autosomal recessive"],"GARD_Disease_Feature__c":[{"Provided_By__c":"ORPHA:254875","HPO_Frequency__c":"Very frequent (80-99%)","Feature__r":{"HPO_Description__c":"Generalized muscular hypotonia (abnormally low muscle tone).","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0001290","HPO_Synonym__c":"Generalized decreased muscle tone; Generalized muscular hypotonia; Hypotonia, generalized","HPO_Name__c":"Generalized hypotonia","Feature_System__c":"Musculoskeletal System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:254875","HPO_Frequency__c":"Frequent (30-79%)","Feature__r":{"HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0002747","HPO_Synonym__c":"Decreased lung function due to weak breathing muscles; Decreased respiratory function due to muscle weakness; Respiratory distress due to muscle weakness; Respiratory failure due to muscle weakness; Respiratory muscle weakness","HPO_Name__c":"Respiratory insufficiency due to muscle weakness","Feature_System__c":"Musculoskeletal System; Respiratory system","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:254875","HPO_Frequency__c":"Very frequent (80-99%)","Feature__r":{"HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0002093","HPO_Synonym__c":"Respiratory impairment","HPO_Name__c":"Respiratory insufficiency","Feature_System__c":"Respiratory system","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:254875","HPO_Frequency__c":"Occasional (5-29%)","Feature__r":{"HPO_Description__c":"Pain in muscle.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0003326","HPO_Synonym__c":"Muscle ache; Muscle pain","HPO_Name__c":"Myalgia","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:254875","HPO_Frequency__c":"Occasional (5-29%)","Feature__r":{"HPO_Description__c":"Reduced strength of one or more muscles innervated by the facial nerve (the seventh cranial nerve).","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0030319","HPO_Synonym__c":"Decreased facial muscle strength; Decreased strength of facial muscles; Face weakness; Facial muscle weakness; Facial weakness; Myasthenia of facial muscles; Reduced facial muscle strength; Weakness of face; Weakness of facial musculature","HPO_Name__c":"Weakness of facial musculature","Feature_System__c":"Musculoskeletal System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:254875","HPO_Frequency__c":"Occasional (5-29%)","Feature__r":{"HPO_Description__c":"Abnormal cognition is characterized by deficits in thinking, reasoning, or remembering.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0100543","HPO_Synonym__c":"Abnormality of cognition; Cognitive abnormality; Cognitive defects; Cognitive deficits; Cognitive impairment; Intellectual impairment","HPO_Name__c":"Cognitive impairment","Feature_System__c":"Nervous System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:254875","HPO_Frequency__c":"Frequent (30-79%)","Feature__r":{"HPO_Description__c":"Generalized weakness or decreased strength of the muscles, affecting both distal and proximal musculature.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0003324","HPO_Synonym__c":"Generalized weakness; Muscle weakness, diffuse; Muscle weakness, generalized","HPO_Name__c":"Generalized muscle weakness","Feature_System__c":"Musculoskeletal System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:254875","HPO_Frequency__c":"Frequent (30-79%)","Feature__r":{"HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0001531","HPO_Synonym__c":"Failure to thrive in first year of life; Faltering weight in infancy; Weight faltering in infancy","HPO_Name__c":"Failure to thrive in infancy","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:254875","HPO_Frequency__c":"Frequent (30-79%)","Feature__r":{"HPO_Description__c":"The presence of skeletal muscular atrophy (which is also known as amyotrophy).","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0003202","HPO_Synonym__c":"Amyotrophy; Amyotrophy involving the extremities; Muscle atrophy; Muscle atrophy, neurogenic; Muscle degeneration; Muscle hypotrophy; Muscle wasting; Muscular atrophy; Neurogenic muscle atrophy; Neurogenic muscle atrophy, especially in the lower limbs; Neurogenic muscular atrophy","HPO_Name__c":"Skeletal muscle atrophy","Feature_System__c":"Musculoskeletal System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:254875","HPO_Frequency__c":"Frequent (30-79%)","Feature__r":{"HPO_Description__c":"Subjective feeling of tiredness characterized by a lack of energy and motivation that persists for six months or longer.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0012432","HPO_Synonym__c":"Chronic extreme exhaustion; Chronic fatigue","HPO_Name__c":"Chronic fatigue","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:254875","HPO_Frequency__c":"Occasional (5-29%)","Feature__r":{"HPO_Description__c":"A severe form of sensorineural hearing impairment.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0008625","HPO_Synonym__c":"Severe sensorineural deafness; Severe sensorineural hearing loss","HPO_Name__c":"Severe sensorineural hearing impairment","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:254875","HPO_Frequency__c":"Frequent (30-79%)","Feature__r":{"HPO_Description__c":"A functional motor deficit where individuals whose responses to the challenges of exercise fail to achieve levels considered normal for their age and sex.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0003546","HPO_Synonym__c":"Decreased ability to exercise; Inability to exercise; Low exercise endurance; Poor exercise tolerance","HPO_Name__c":"Exercise intolerance","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:254875","HPO_Frequency__c":"Always (100%)","Feature__r":{"HPO_Description__c":"A disorder of muscle unrelated to impairment of innervation or neuromuscular junction.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0003198","HPO_Synonym__c":"Muscle tissue disease; Myopathic changes","HPO_Name__c":"Myopathy","Feature_System__c":"Musculoskeletal System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:254875","HPO_Frequency__c":"Frequent (30-79%)","Feature__r":{"HPO_Description__c":"Hypotonia is an abnormally low muscle tone (the amount of tension or resistance to movement in a muscle). Even when relaxed, muscles have a continuous and passive partial contraction which provides some resistance to passive stretching. Hypotonia thus manifests as diminished resistance to passive stretching. Hypotonia is not the same as muscle weakness, although the two conditions can co-exist.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0001252","HPO_Synonym__c":"Low muscle tone; Low or weak muscle tone; Muscle hypotonia; Muscular hypotonia","HPO_Name__c":"Hypotonia","Feature_System__c":"Musculoskeletal System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:254875","HPO_Frequency__c":"Frequent (30-79%)","Feature__r":{"HPO_Description__c":"Encephalopathy with onset in the infantile period.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0007105","HPO_Name__c":"Infantile encephalopathy","Feature_System__c":"Nervous System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:254875","HPO_Frequency__c":"Frequent (30-79%)","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:254875","HPO_Frequency__c":"Frequent (30-79%)","Feature__r":{"HPO_Description__c":"Reduced strength of the musculature of the distal extremities.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0002460","HPO_Synonym__c":"Distal limb muscle weakness; Distal limb weakness; Distal muscular weakness; Distal paresis; Muscle weakness, distal; Muscle weakness, distal limbs, due to neuronopathy; Weakness of distal muscles; Weakness of outermost muscles","HPO_Name__c":"Distal muscle weakness","Feature_System__c":"Musculoskeletal System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:254875","HPO_Frequency__c":"Frequent (30-79%)","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:254875","HPO_Frequency__c":"Occasional (5-29%)","Feature__r":{"HPO_Description__c":"Dysarthric speech is a general description referring to a neurological speech disorder characterized by poor articulation. Depending on the involved neurological structures, dysarthria may be further classified as spastic, flaccid, ataxic, hyperkinetic and hypokinetic, or mixed.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0001260","HPO_Synonym__c":"Difficulty articulating speech; Dysarthric speech","HPO_Name__c":"Dysarthria","Feature_System__c":"Nervous System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:254875","HPO_Frequency__c":"Very frequent (80-99%)","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:254875","HPO_Frequency__c":"Frequent (30-79%)","Feature__r":{"HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0003698","HPO_Synonym__c":"Difficulty in standing; Standing instability","HPO_Name__c":"Difficulty standing","Feature_System__c":"Musculoskeletal System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:254875","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:254875","HPO_Frequency__c":"Occasional (5-29%)","Feature__r":{"HPO_Description__c":"A form of sensorineural hearing impairment with infantile onset.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0008610","HPO_Synonym__c":"Infantile sensorineural hearing loss","HPO_Name__c":"Infantile sensorineural hearing impairment","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:254875","HPO_Frequency__c":"Occasional (5-29%)","Feature__r":{"HPO_Description__c":"Initial bilateral ptosis followed by limitation of eye movements in all directions and slowing of saccades.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0000590","HPO_Synonym__c":"External ophthalmoplegia, progressive","HPO_Name__c":"Progressive external ophthalmoplegia","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:254875","HPO_Frequency__c":"Uncommon (<1-4%)","Feature__r":{"HPO_Description__c":"The presence of an abnormal lateral curvature of the spine.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0002650","HPO_Name__c":"Scoliosis","Feature_System__c":"Musculoskeletal System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:254875","HPO_Frequency__c":"Very frequent (80-99%)","Feature__r":{"HPO_Description__c":"Loss of previously present motor (i.e., movement) abilities.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0002333","HPO_Synonym__c":"Progressive degeneration of movement","HPO_Name__c":"Motor deterioration","Feature_System__c":"Nervous System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:254875","HPO_Frequency__c":"Frequent (30-79%)","Feature__r":{"HPO_Description__c":"Respiratory distress is objectively observable as the physical or emotional consequences from the experience of dyspnea. The physical presentation of respiratory distress is generally referred to as labored breathing, while the sensation of respiratory distress is called shortness of breath or dyspnea.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0002098","HPO_Synonym__c":"Breathing difficulties; Labored breathing; Respiratory difficulties","HPO_Name__c":"Respiratory distress","Feature_System__c":"Respiratory system","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:254875","HPO_Frequency__c":"Occasional (5-29%)","Feature__r":{"HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0005946","HPO_Name__c":"Ventilator dependence with inability to wean","Feature_System__c":"Respiratory system","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:254875","HPO_Frequency__c":"Frequent (30-79%)","Feature__r":{"HPO_Description__c":"A generalized-onset seizure is a type of seizure originating at some point within, and rapidly engaging, bilaterally distributed networks. The networks may include cortical and subcortical structures but not necessarily the entire cortex.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0002197","HPO_Synonym__c":"Generalized onset seizure; Generalized seizures; Generalized-onset seizures; Primary generalized seizure","HPO_Name__c":"Generalized-onset seizure","Feature_System__c":"Nervous System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:254875","HPO_Frequency__c":"Frequent (30-79%)","Feature__r":{"HPO_Description__c":"Impaired feeding performance of an infant as manifested by difficulties such as weak and ineffective sucking, brief bursts of sucking, and falling asleep during sucking. There may be difficulties with chewing or maintaining attention.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0008872","HPO_Name__c":"Feeding difficulties in infancy","Feature_System__c":"Digestive System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:254875","HPO_Frequency__c":"Frequent (30-79%)","Feature__r":{"HPO_Description__c":"An increased susceptibility to pneumonia as manifested by a history of recurrent episodes of pneumonia.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0006532","HPO_Synonym__c":"Multiple pulmonary infections; Pneumonia, recurrent; Pneumonia, recurrent episodes; Pulmonary infection; Pulmonary infections; pulmonary infections, recurrent; Recurrent pneumonia; Recurrent pulmonary infections","HPO_Name__c":"Recurrent pneumonia","Feature_System__c":"Respiratory system; Immune System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:254875","HPO_Frequency__c":"Uncommon (<1-4%)","Feature__r":{"HPO_Description__c":"Muscular weakness and atrophy related to loss of the motor neurons of the spinal cord and brainstem.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0007269","HPO_Synonym__c":"Spinal muscle degeneration; Spinal muscle wasting","HPO_Name__c":"Spinal muscular atrophy","Feature_System__c":"Musculoskeletal System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:254875","HPO_Frequency__c":"Occasional (5-29%)","Feature__r":{"HPO_Description__c":"Bulbar weakness (or bulbar palsy) refers to bilateral impairment of function of the lower cranial nerves IX, X, XI and XII, which occurs due to lower motor neuron lesion either at nuclear or fascicular level in the medulla or from bilateral lesions of the lower cranial nerves outside the brain-stem. Bulbar weakness is often associated with difficulty in chewing, weakness of the facial muscles, dysarthria, palatal weakness and regurgitation of fluids, dysphagia, and dysphonia.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0001283","HPO_Synonym__c":"Bulbar muscle weakness; Bulbar palsies; Bulbar weakness","HPO_Name__c":"Bulbar palsy","Feature_System__c":"Nervous System; Musculoskeletal System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:254875","HPO_Frequency__c":"Occasional (5-29%)","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:254875","HPO_Frequency__c":"Frequent (30-79%)","Feature__r":{"HPO_Description__c":"A type of Developmental delay characterized by a delay in acquiring motor skills.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0001270","HPO_Synonym__c":"Delay in development of motor milestones; Delay in motor development; Delayed development of motor milestones; Delayed early motor milestones; Delayed motor development; Delayed motor milestones; Locomotor delay; Motor developmental delay; Motor developmental milestones not achieved; Motor retardation; Retarded motor development; Slow development of motor milestones","HPO_Name__c":"Motor delay","Feature_System__c":"Nervous System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:254875","HPO_Frequency__c":"Occasional (5-29%)","Feature__r":{"HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0001488","HPO_Synonym__c":"Drooping of both upper eyelids","HPO_Name__c":"Bilateral ptosis","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:254875","HPO_Frequency__c":"Frequent (30-79%)","Feature__r":{"HPO_Description__c":"A severe form of respiratory insufficiency characterized by inadequate gas exchange such that the levels of oxygen or carbon dioxide cannot be maintained within normal limits.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0002878","HPO_Synonym__c":"Respiratory failure","HPO_Name__c":"Respiratory failure","Feature_System__c":"Respiratory system","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:254875","HPO_Frequency__c":"Frequent (30-79%)","Feature__r":{"HPO_Description__c":"The term gait disturbance can refer to any disruption of the ability to walk.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0001288","HPO_Synonym__c":"Abnormal gait; Abnormal walk; Difficulty in walking; Gait abnormalities; Gait difficulties; Gait disturbances; Impaired gait; Walking disability","HPO_Name__c":"Gait disturbance","Feature_System__c":"Nervous System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:254875","HPO_Frequency__c":"Frequent (30-79%)","Feature__r":{"HPO_Description__c":"Lack of strength of the proximal muscles that becomes progressively more severe.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0009073","HPO_Synonym__c":"Muscle weakness, progressive, proximal","HPO_Name__c":"Progressive proximal muscle weakness","Feature_System__c":"Musculoskeletal System","HPO_Feature_Type__c":"Symptom"}}],"tags":{"Cause":["Genetics","Inborn Errors of Metabolism","Mitochondrial"],"Disease Category":["Genetics","Neurology","Gastroenterology","Inborn Errors of Metabolism","Mitochondrial"],"Specialist":["Genetics","Neurology","Gastroenterology","Neuromuscular medicine","Pediatrics"],"Account":["Mitochondrial"]},"synonyms":["mitochondrial dna depletion myopathy, tk2-related"," mitochondrial dna depletion syndrome 2 (myopathic type)"," mitochondrial dna depletion syndrome 2 myopathic type"," mitochondrial dna depletion syndrome type 2"," mtdna depletion syndrome, myopathic form"," mtdps2"," tk2-related mitochondrial deoxyribonucleic acid depletion syndrome myopathic form"," tk2-related mitochondrial dna depletion myopathy"," tk2-related mitochondrial dna depletion syndrome myopathic form"," tk2-related mitochondrial dna depletion syndrome, myopathic form"]}