{"Name":"Congenital myopathy with reduced type 2 muscle fibers","DiseaseID__c":"GARD:0017989","id":17989,"encodedName":"congenital-myopathy-with-reduced-type-2-muscle-fibers","IsDeleted":false,"Disease_Name_Full__c":"Congenital myopathy with reduced type 2 muscle fibers","Xref_IDs__c":"1255274002; C5193081; DOID:0081346; MEDGEN:1672638; MONDO:0034109; OMIM:618414; ORPHA:544602","USA_Estimate__c":"1,000","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":"1 to 8,000","No_of_HRSA_records__c":0,"Evidence_Based_Score__c":0,"No_of_Disease_Descriptions__c":2,"Disease_Characteristics_Score__c":6,"No_of_Age_at_Onset__c":2,"Description_Source__c":"ORPHA:544602","Disease_Description__c":"A rare congenital myopathy characterized by neonatal onset of severe muscle weakness with selective atrophy/hypotrophy or absence of type II myofibers. Patients present at birth with hypotonia and respiratory failure, as well as mild facial and severe axial and proximal upper and lower limb weakness with areflexia and mild contractures. Eye movements and cardiac function are normal.","GARD_Name__c":"Congenital myopathy with reduced type 2 muscle fibers","GARD_Synonym__c":"congenital myopathy 14; congenital myopathy with fast-twitch fiber atrophy; congenital myopathy with reduced type ii muscle fibers; congenital myopathy with type 2 muscle fiber atrophy; congenital myopathy with type ii fiber atrophy; myopathy, congenital, with fast-twitch (type ii) fiber atrophy; myopathy, congenital, with fast-twitch (type ii) fibre atrophy","Curated_Disease_Description_Source__c":"ORPHA:544602","Curated_Disease_Description__c":"A rare congenital myopathy characterized by neonatal onset of severe muscle weakness with selective atrophy/hypotrophy or absence of type II myofibers. Patients present at birth with hypotonia and respiratory failure, as well as mild facial and severe axial and proximal upper and lower limb weakness with areflexia and mild contractures. Eye movements and cardiac function are normal.","Curated_USA_Estimate_Source__c":null,"Curated_USA_Estimate__c":"1,000","Age_at_Onset_Snippet_Text__c":"during Pregnancy and as a Newborn","SourceID__c":"ORPHA:544602","Deprecated__c":"No","Disease_Concept_Type__c":"Rare Disease Entity","MONDO_ID__c":"MONDO:0034109","ORPHANET_ID__c":"ORPHA:544602","Replaced_By_ID__c":null,"Display_Spanish_Disease_Name__c":"Miopatía congénita con reducción de fibras musculares de tipo 2","Spanish_Description_Source__c":null,"Spanish_Description__c":null,"Spanish_Disease_Name__c":"miopatía congénita con reducción de fibras musculares de tipo 2","Spanish_GARD_Synonym__c":"miopatía congénita con atrofia de fibras de contracción rápida; miopatía congénita con atrofia de fibras de tipo ii; miopatía congénita con atrofia de fibras musculares de tipo 2; miopatía congénita con reducción de fibras musculares de tipo ii","Category_Linearization__c":"ORPHA:98006","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":"A rare congenital myopathy characterized by neonatal onset of severe muscle weakness with selective atrophy/hypotrophy or absence of type II myofibers. Patients present at birth with hypotonia and respiratory failure, as well as mild facial and severe axial and proximal upper and lower limb weakness with areflexia and mild contractures. Eye movements and cardiac function are normal.","Curated_Disease_Description_Source__c":"ORPHA:544602","GARD_Synonym__c":"congenital myopathy 14; congenital myopathy with fast-twitch fiber atrophy; congenital myopathy with reduced type ii muscle fibers; congenital myopathy with type 2 muscle fiber atrophy; congenital myopathy with type ii fiber atrophy; myopathy, congenital, with fast-twitch (type ii) fiber atrophy; myopathy, congenital, with fast-twitch (type ii) fibre atrophy","Name":"Congenital myopathy with reduced type 2 muscle fibers","Curated_USA_Estimate__c":"1,000","estimateUsa":"1,000"}],"Organization_Supported_Diseases__c":[{"Account_Name__c":"Muscular Dystrophy Canada","Website__c":"https://muscle.ca/"}],"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":"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":"Antenatal","Provided_By__c":"ORPHA:544602"},{"Age_At_Onset__c":"Neonatal","Provided_By__c":"ORPHA:544602"}],"External_Identifier_Disease__c":[{"URL__c":"https://www.orpha.net/en/disease/detail/544602","Source__c":"C5193081; MONDO:0034109; ORPHA:544602","Xref__c":"ORPHA:544602"},{"URL__c":"https://www.omim.org/entry/618414","Source__c":"C5193081; MONDO:0034109; ORPHA:544602","Xref__c":"OMIM:618414"},{"URL__c":"https://www.ncbi.nlm.nih.gov/medgen/?term=1672638","Source__c":"C5193081","Xref__c":"MEDGEN:1672638"},{"URL__c":"https://www.ebi.ac.uk/ols4/ontologies/doid/classes?obo_id=DOID%3A0081346","Source__c":"MONDO:0034109","Xref__c":"DOID:0081346"},{"URL__c":"https://uts.nlm.nih.gov/uts/umls/concept/C5193081","Source__c":"C5193081","Xref__c":"C5193081"},{"URL__c":"https://browser.ihtsdotools.org/?perspective=full&conceptId1=1255274002","Source__c":"C5193081","Xref__c":"1255274002"},{"URL__c":"http://purl.obolibrary.org/obo/MONDO_0034109","Source__c":"GARD:0017989","Xref__c":"MONDO:0034109"}],"GARD_Disease_Gene__c":[{"GeneSymbol__c":"MYL1","Gene_Type__c":"protein-coding gene","Causal_Gene__c":true}],"Inheritance__c":["Autosomal recessive"],"GARD_Disease_Feature__c":[{"Provided_By__c":"OMIM:618414","HPO_Frequency__c":"Frequent (30-79%)","Feature__r":{"HPO_Description__c":"Impaired ability to eat related to problems gathering food and getting ready to suck, chew, or swallow it.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0011968","HPO_Synonym__c":"Decreased oral intake; Feeding difficulties; Feeding problems; Poor feeding","HPO_Name__c":"Feeding difficulties","Feature_System__c":"Digestive System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"OMIM:618414","HPO_Frequency__c":"Frequent (30-79%)","Feature__r":{"HPO_Description__c":"Absence of neurologic reflexes such as the knee-jerk reaction.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0001284","HPO_Synonym__c":"Absent deep tendon reflexes; Absent tendon reflexes; Deep tendon reflexes absent; Loss of deep tendon reflexes; Lost deep tendon reflexes","HPO_Name__c":"Areflexia","Feature_System__c":"Nervous System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"OMIM:618414","HPO_Frequency__c":"Frequent (30-79%)","Feature__r":{"HPO_Description__c":"Lack of full passive range of motion (restrictions in flexion, extension, or other movements) of the hip joint resulting from structural changes of non-bony tissues, such as muscles, tendons, ligaments, joint capsules and/or skin.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0003273","HPO_Synonym__c":"Flexion contracture of hips; Flexion contractures of hips; Hip contractures; Hip flexion contractures","HPO_Name__c":"Hip contracture","Feature_System__c":"Musculoskeletal System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"OMIM:618414","HPO_Frequency__c":"Very frequent (80-99%)","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":"OMIM:618414","HPO_Frequency__c":"Frequent (30-79%)","Feature__r":{"HPO_Description__c":"The Premie-Neuro and the Dubowitz Neurological Examination score head lag in the same manner. Scoring for both is as follows: 0 = head drops and stays back, 1 = tries to lift head but drops it back, 2 = able to lift head slightly, 3 = lifts head in line with body, and 4 = head in front of body. This term applies if head lag persists beyond an expected age at a level of 0 or 1. Persistent head lag beyond age 4 mo has been linked to poor outcomes.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0032988","HPO_Synonym__c":"Head lag; Headlag","HPO_Name__c":"Persistent head lag","Feature_System__c":"Nervous System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"OMIM:618414","HPO_Frequency__c":"Very frequent (80-99%)","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":"OMIM:618414","HPO_Frequency__c":"Frequent (30-79%)","Feature__r":{"HPO_Description__c":"An elbow contracture that limits the ability of the elbow joint to be extended (straightened), meaning that the elbow is fixed in an flexed (bent) position.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0002987","HPO_Synonym__c":"Elbow flexion contractures; Elbow flexion deformity; Fixed flexion at the elbow joint","HPO_Name__c":"Elbow flexion contracture","Feature_System__c":"Musculoskeletal System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"OMIM:618414","HPO_Frequency__c":"Frequent (30-79%)","Feature__r":{"HPO_Description__c":"Height of the palate more than 2 SD above the mean (objective) or palatal height at the level of the first permanent molar more than twice the height of the teeth (subjective).","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0000218","HPO_Synonym__c":"Elevated palate; High arched palate; High palate; High, arched palate; High-arched palate; Increased palatal height; Palate high-arched; Palate, high-arched","HPO_Name__c":"High palate","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"OMIM:618414","HPO_Frequency__c":"Frequent (30-79%)","Feature__r":{"HPO_Description__c":"Decreased strength of the neck musculature.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0000467","HPO_Synonym__c":"Floppy neck; Neck muscle weakness","HPO_Name__c":"Neck muscle weakness","Feature_System__c":"Musculoskeletal System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"OMIM:618414","HPO_Frequency__c":"Frequent (30-79%)","Feature__r":{"HPO_Description__c":"A facial appearance characteristic of myopathic conditions. The face appears expressionless with sunken cheeks, bilateral ptosis, and inability to elevate the corners of the mouth, due to muscle weakness.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0002058","HPO_Synonym__c":"Myopathic face; Myopathic facial appearance","HPO_Name__c":"Myopathic facies","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"OMIM:618414","HPO_Frequency__c":"Frequent (30-79%)","Feature__r":{"HPO_Description__c":"A lack of strength of the proximal muscles.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0003701","HPO_Synonym__c":"Muscle weakness, proximal; Proximal limb muscle weakness; Proximal limb weakness; Weakness in muscles of upper arms and upper legs","HPO_Name__c":"Proximal muscle weakness","Feature_System__c":"Musculoskeletal System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"OMIM:618414","HPO_Frequency__c":"Very frequent (80-99%)","Feature__r":{"HPO_Description__c":"Reduced strength of the axial musculature (i.e., of the muscles of the head and neck, spine, and ribs).","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0003327","HPO_Name__c":"Axial muscle weakness","Feature_System__c":"Musculoskeletal System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"OMIM:618414","HPO_Frequency__c":"Frequent (30-79%)","Feature__r":{"HPO_Description__c":"An abnormal reduction in quantity or strength of fetal movements.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0001558","HPO_Synonym__c":"Decreased fetal activity; Decreased fetal movements; Decreased movement in utero; Dminished fetal movement; Fetal hypokinesia; Less than 10 fetal movements in 12 hours; Reduced fetal movement; Reduced fetal movements","HPO_Name__c":"Decreased fetal movement","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"OMIM:618414","HPO_Frequency__c":"Frequent (30-79%)","Feature__r":{"HPO_Description__c":"The presence of excess amniotic fluid in the uterus during pregnancy.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0001561","HPO_Synonym__c":"High levels of amniotic fluid; Hydramnios","HPO_Name__c":"Polyhydramnios","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"OMIM:618414","HPO_Frequency__c":"Very frequent (80-99%)","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":"OMIM:618414","HPO_Frequency__c":"Very frequent (80-99%)","Feature__r":{"HPO_Description__c":"An increased volume of the endomysium, which is a connective tissue sheath that surrounds each muscle fiber. Together, bundles of muscle fibers form a fasciculus, surrounded by another layer of connective tissue called the perimysium.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0100297","HPO_Synonym__c":"Endomysial fibrosis","HPO_Name__c":"Increased endomysial connective tissue","Feature_System__c":"Musculoskeletal System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"OMIM:618414","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":"OMIM:618414","HPO_Frequency__c":"Very frequent (80-99%)","Feature__r":{"HPO_Description__c":"An abnormally high degree of muscle fiber size variation. This phenotypic feature can be observed upon muscle biopsy.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0003557","HPO_Synonym__c":"Increased fiber size variation; Increased variability in muscle fiber size; Increased variation in fiber size; Increased variation in muscle fiber size; Variation in muscle fiber size","HPO_Name__c":"Increased variability in muscle fiber diameter","Feature_System__c":"Musculoskeletal System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"OMIM:618414","HPO_Frequency__c":"Frequent (30-79%)","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":"OMIM:618414","HPO_Frequency__c":"Frequent (30-79%)","Feature__r":{"HPO_Description__c":"A compound muscle action potential (CMAP) is a type of electromyography (EMG). CMAP refers to a group of almost simultaneous action potentials from several muscle fibers in the same area evoked by stimulation of the supplying motor nerve and are recorded as one multipeaked summated action potential. This abnormality refers to a greater than normal decrease in the amplitude during the course of the investigation.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0003403","HPO_Synonym__c":"EMG: decremental response of CMAP to repetitive nerve stimulation","HPO_Name__c":"EMG: decremental response of compound muscle action potential to repetitive nerve stimulation","Feature_System__c":"Musculoskeletal System","HPO_Feature_Type__c":"Procedure_EMG"}},{"Provided_By__c":"OMIM:618414","HPO_Frequency__c":"Very frequent (80-99%)","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":"OMIM:618414","HPO_Frequency__c":"Frequent (30-79%)","Feature__r":{"HPO_Description__c":"The condition of inability to eat normally treated by placement of a thin tube through the nose into the stomach that is then used to carry food.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0040288","HPO_Name__c":"Nasogastric tube feeding","Feature_System__c":"Digestive System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"OMIM:618414","HPO_Frequency__c":"Frequent (30-79%)","Feature__r":{"HPO_Description__c":"A type of knee joint contracture in which the knee is in a fixed bent (flexed) configuration such that it cannot be straightened actively or passively.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0006380","HPO_Synonym__c":"Flexion contracture of knees; Flexion contractures at both knees; Flexion contractures of knees; Flexion deformity of the knee; Knee flexion contractures; Knee flexion deformity","HPO_Name__c":"Knee flexion contracture","Feature_System__c":"Musculoskeletal System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"OMIM:618414","HPO_Frequency__c":"Frequent (30-79%)","Feature__r":{"HPO_Description__c":"An abnormal predominance of type I muscle fibers (in general, this feature can only be observed on muscle biopsy).","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0003803","HPO_Synonym__c":"Type I muscle fiber predominance","HPO_Name__c":"Type 1 muscle fiber predominance","Feature_System__c":"Musculoskeletal System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"OMIM:618414","Feature__r":{"HPO_Description__c":"A flexion contracture is a bent (flexed) joint that cannot be straightened actively or passively. It is thus a chronic loss of joint motion due to structural changes in muscle, tendons, ligaments, or skin that prevents normal movement of joints.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0001371","HPO_Synonym__c":"Flexed joint that cannot be straightened; Flexion contractures; Flexion contractures of joints","HPO_Name__c":"Flexion contracture","Feature_System__c":"Musculoskeletal System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"OMIM:618414","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"}}],"tags":{"Cause":["Genetics"],"Disease Category":["Genetics","Neurology"],"Specialist":["Genetics","Neurology","Neuromuscular medicine","Pediatrics"]},"synonyms":["congenital myopathy 14"," congenital myopathy with fast-twitch fiber atrophy"," congenital myopathy with reduced type ii muscle fibers"," congenital myopathy with type 2 muscle fiber atrophy"," congenital myopathy with type ii fiber atrophy"," myopathy, congenital, with fast-twitch (type ii) fiber atrophy"," myopathy, congenital, with fast-twitch (type ii) fibre atrophy"]}