{"Name":"Charcot-Marie-Tooth disease type 2A2","DiseaseID__c":"GARD:0016925","id":16925,"encodedName":"charcot-marie-tooth-disease-type-2a2","IsDeleted":false,"Disease_Name_Full__c":"Charcot-Marie-Tooth disease type 2A2","Xref_IDs__c":"764850002; C150646; C4721887; C563757; DOID:0110155; MEDGEN:1648317; MONDO:0012231; OMIM:609260; ORPHA:99947","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":2,"Disease_Characteristics_Score__c":8,"No_of_Age_at_Onset__c":1,"Description_Source__c":"MONDO:0012231","Disease_Description__c":"A subtype of Autosomal dominant Charcot-Marie-Tooth disease type 2 characterized by the childhood onset of distal weakness and areflexia (with earlier and more severe involvement of the lower extremities), reduced sensory modalities (primarily pain and temperature sensation), foot deformities, postural tremor, scoliosis and contractures. Optic atrophy, vocal cord palsy with dysphonia, sensorineural hearing loss, spinal cord abnormalities and hydrocephalus have also been reported.","GARD_Name__c":"Charcot-Marie-Tooth disease type 2A2","GARD_Synonym__c":"autosomal dominant axonal charcot-marie-tooth disease type 2a2; autosomal dominant charcot-marie-tooth disease type 2a2; charcot-marie-tooth disease type 2 caused by mutation in mfn2; charcot-marie-tooth disease type 2a2a; charcot-marie-tooth disease, axonal, autosomal dominant, type 2a2a; charcot-marie-tooth disease, axonal, type 2a2; charcot-marie-tooth disease, axonal, type 2a2a; charcot-marie-tooth disease, neuronal, type 2a2; charcot-marie-tooth neuronal type 2a2; charcot-marie-tooth neuropathy type 2a2; cmt2a2; hereditary motor and sensory neuropathy iia2; hmsn iia2; hmsn2a2; mfn2 charcot-marie-tooth disease type 2","Curated_Disease_Description_Source__c":"MONDO:0012231","Curated_Disease_Description__c":"A subtype of Autosomal dominant Charcot-Marie-Tooth disease type 2 characterized by the childhood onset of distal weakness and areflexia (with earlier and more severe involvement of the lower extremities), reduced sensory modalities (primarily pain and temperature sensation), foot deformities, postural tremor, scoliosis and contractures. Optic atrophy, vocal cord palsy with dysphonia, sensorineural hearing loss, spinal cord abnormalities and hydrocephalus have also been reported.","Curated_USA_Estimate_Source__c":null,"Curated_USA_Estimate__c":null,"Age_at_Onset_Snippet_Text__c":"as a Child","SourceID__c":"ORPHA:99947","Deprecated__c":"No","Disease_Concept_Type__c":"Rare Disease Entity","MONDO_ID__c":"MONDO:0012231","ORPHANET_ID__c":"ORPHA:99947","Replaced_By_ID__c":null,"Display_Spanish_Disease_Name__c":"Enfermedad de charcot-marie-tooth autosómica dominante tipo 2a2","Spanish_Description_Source__c":"ORPHA:99947","Spanish_Description__c":"Es un subtipo de la enfermedad de Charcot-Marie-Tooth tipo 2 autosómica dominante caracterizado por el inicio en la infancia de debilidad distal y arreflexia (con una afectación más temprana y más grave de las extremidades inferiores), modalidades sensoriales reducidas (principalmente sensibilidad al dolor y la temperatura), deformidades del pie, temblor postural, escoliosis y contracturas. También se ha descrito atrofia óptica, parálisis de las cuerdas vocales con disfonía, pérdida auditiva neurosensorial, anomalías espinales e hidrocefalia.","Spanish_Disease_Name__c":"enfermedad de charcot-marie-tooth autosómica dominante tipo 2a2","Spanish_GARD_Synonym__c":null,"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 subtype of Autosomal dominant Charcot-Marie-Tooth disease type 2 characterized by the childhood onset of distal weakness and areflexia (with earlier and more severe involvement of the lower extremities), reduced sensory modalities (primarily pain and temperature sensation), foot deformities, postural tremor, scoliosis and contractures. Optic atrophy, vocal cord palsy with dysphonia, sensorineural hearing loss, spinal cord abnormalities and hydrocephalus have also been reported.","Curated_Disease_Description_Source__c":"MONDO:0012231","GARD_Synonym__c":"autosomal dominant axonal charcot-marie-tooth disease type 2a2; autosomal dominant charcot-marie-tooth disease type 2a2; charcot-marie-tooth disease type 2 caused by mutation in mfn2; charcot-marie-tooth disease type 2a2a; charcot-marie-tooth disease, axonal, autosomal dominant, type 2a2a; charcot-marie-tooth disease, axonal, type 2a2; charcot-marie-tooth disease, axonal, type 2a2a; charcot-marie-tooth disease, neuronal, type 2a2; charcot-marie-tooth neuronal type 2a2; charcot-marie-tooth neuropathy type 2a2; cmt2a2; hereditary motor and sensory neuropathy iia2; hmsn iia2; hmsn2a2; mfn2 charcot-marie-tooth disease type 2","Name":"Charcot-Marie-Tooth disease type 2A2","estimateUsa":""}],"Organization_Supported_Diseases__c":[{"Account_Name__c":"CMT Research Foundation","Website__c":"https://cmtrf.org/"},{"Account_Name__c":"Muscular Dystrophy Canada","Website__c":"https://muscle.ca/"},{"Account_Name__c":"ACMT-Rete per la malattia di Charcot-Marie-Tooth","Website__c":"https://www.acmt-rete.it/"},{"Account_Name__c":"Charcot-Marie-Tooth Association","Website__c":"https://www.cmtausa.org/"},{"Account_Name__c":"Charcot-Marie-Tooth UK","Website__c":"https://www.cmt.org.uk/"},{"Account_Name__c":"Fondazione Telethon","Website__c":"https://www.fondazionetelethon.it/"},{"Account_Name__c":"Hereditary Neuropathy Foundation Inc.","Website__c":"https://www.hnf-cure.org/"},{"Account_Name__c":"Muscular Dystrophy Association","Website__c":"https://www.mda.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":"Peripheral Neuropathy","Tag_Category__c":"Account","curated_tag_name":"Peripheral neuropathy"},{"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:99947"}],"External_Identifier_Disease__c":[{"URL__c":"https://www.ncbi.nlm.nih.gov/books/NBK1511","Source__c":"Gene Review","Xref__c":"NBK1511"},{"URL__c":"https://www.ncbi.nlm.nih.gov/books/NBK1358","Source__c":"Gene Review","Xref__c":"NBK1358"},{"URL__c":"https://www.ncbi.nlm.nih.gov/mesh/C563757","Source__c":"MONDO:0012231","Xref__c":"C563757"},{"URL__c":"https://evsexplore.semantics.cancer.gov/evsexplore/concept/ncit/C150646","Source__c":"C4721887; MONDO:0012231","Xref__c":"C150646"},{"URL__c":"https://www.omim.org/entry/609260","Source__c":"C4721887; MONDO:0012231; ORPHA:99947","Xref__c":"OMIM:609260"},{"URL__c":"https://browser.ihtsdotools.org/?perspective=full&conceptId1=764850002","Source__c":"C4721887; MONDO:0012231","Xref__c":"764850002"},{"URL__c":"https://www.orpha.net/en/disease/detail/99947","Source__c":"C4721887; MONDO:0012231; ORPHA:99947","Xref__c":"ORPHA:99947"},{"URL__c":"https://uts.nlm.nih.gov/uts/umls/concept/C4721887","Source__c":"C4721887","Xref__c":"C4721887"},{"URL__c":"https://www.ebi.ac.uk/ols4/ontologies/doid/classes?obo_id=DOID%3A0110155","Source__c":"MONDO:0012231","Xref__c":"DOID:0110155"},{"URL__c":"https://www.ncbi.nlm.nih.gov/medgen/?term=1648317","Source__c":"C4721887","Xref__c":"MEDGEN:1648317"},{"URL__c":"http://purl.obolibrary.org/obo/MONDO_0012231","Source__c":"GARD:0016925","Xref__c":"MONDO:0012231"}],"GARD_Disease_Gene__c":[{"GeneSymbol__c":"MFN2","GHR_URL__c":"https://medlineplus.gov/genetics/gene/mfn2","Gene_Type__c":"protein-coding gene","Causal_Gene__c":true}],"Inheritance__c":["Autosomal dominant"],"GARD_Disease_Feature__c":[{"Provided_By__c":"ORPHA:99947","HPO_Frequency__c":"Frequent (30-79%)","Feature__r":{"HPO_Description__c":"An abnormality of the ability (skills) to perform a precise movement of small muscles with the intent to perform a specific act. Fine motor skills are required to mediate movements of the wrists, hands, fingers, feet, and toes.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0007010","HPO_Synonym__c":"Fine motor disability; Fine motor impairment; Fine motor skill dysfunction; Impaired fine motor skills","HPO_Name__c":"Poor fine motor coordination","Feature_System__c":"Nervous System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:99947","HPO_Frequency__c":"Frequent (30-79%)","Feature__r":{"HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0002601","HPO_Name__c":"Paresis of extensor muscles of the big toe","Feature_System__c":"Musculoskeletal System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:99947","HPO_Frequency__c":"Uncommon (<1-4%)","Feature__r":{"HPO_Description__c":"Inability to see well at night or in poor light.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0000662","HPO_Synonym__c":"Night blindness; Night-blindness; Poor night vision","HPO_Name__c":"Nyctalopia","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:99947","HPO_Frequency__c":"Uncommon (<1-4%)","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:99947","HPO_Frequency__c":"Occasional (5-29%)","Feature__r":{"HPO_Description__c":"A structural abnormality of the spinal cord (myelon).","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0002143","HPO_Synonym__c":"Abnormality of the spinal cord","HPO_Name__c":"Abnormal spinal cord morphology","Feature_System__c":"Nervous System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:99947","HPO_Frequency__c":"Frequent (30-79%)","Feature__r":{"HPO_Description__c":"Reduced strength of the distal musculature of the legs.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0009053","HPO_Synonym__c":"Distal muscle weakness in lower limbs; Muscle weakness, lower limb, distal","HPO_Name__c":"Distal lower limb muscle weakness","Feature_System__c":"Musculoskeletal System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:99947","HPO_Frequency__c":"Frequent (30-79%)","Feature__r":{"HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0002359","HPO_Synonym__c":"Frequent falls","HPO_Name__c":"Frequent falls","Feature_System__c":"Musculoskeletal System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:99947","HPO_Frequency__c":"Occasional (5-29%)","Feature__r":{"HPO_Description__c":"Hoarseness refers to a change in the pitch or quality of the voice, with the voice sounding weak, very breathy, scratchy, or husky.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0001609","HPO_Synonym__c":"Hoarse voice; Hoarseness; Husky voice","HPO_Name__c":"Hoarse voice","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:99947","HPO_Frequency__c":"Frequent (30-79%)","Feature__r":{"HPO_Description__c":"An unpleasant sensation characterized by physical discomfort (such as pricking, throbbing, or aching) localized to the foot.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0025238","HPO_Synonym__c":"Foot pain","HPO_Name__c":"Foot pain","Feature_System__c":"Musculoskeletal System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:99947","HPO_Frequency__c":"Occasional (5-29%)","Feature__r":{"HPO_Description__c":"Absence of the knee jerk reflex, which can normally be elicited by tapping the patellar tendon with a reflex hammer just below the patella.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0006844","HPO_Synonym__c":"Absent knee jerk reflex","HPO_Name__c":"Absent patellar reflexes","Feature_System__c":"Nervous System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:99947","HPO_Frequency__c":"Frequent (30-79%)","Feature__r":{"HPO_Description__c":"An abnormal reduction in sensation in the distal portions of the extremities.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0002936","HPO_Synonym__c":"Decreased distal sensation; Decreased sensation in extremities; Distal sensation loss; Distal sensory impairment in lower limbs; Distal sensory impairment of the lower extremities; Distal sensory loss; Distal sensory loss, upper and lower limbs; Loss of distal sensation","HPO_Name__c":"Distal sensory impairment","Feature_System__c":"Nervous System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:99947","HPO_Frequency__c":"Occasional (5-29%)","Feature__r":{"HPO_Description__c":"Abnormal sensations such as tingling, pricking, or numbness of the skin with no apparent physical cause.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0003401","HPO_Synonym__c":"Paresthesias; Pins and needles feeling; Tingling","HPO_Name__c":"Paresthesia","Feature_System__c":"Nervous System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:99947","HPO_Frequency__c":"Occasional (5-29%)","Feature__r":{"HPO_Description__c":"Difficulty in speaking due to a physical disorder of the mouth, tongue, throat, or vocal cords. Associated with a known physical or neurological cause.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0001618","HPO_Synonym__c":"Inability to produce voice sounds; Voice change","HPO_Name__c":"Dysphonia","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:99947","HPO_Frequency__c":"Very frequent (80-99%)","Feature__r":{"HPO_Description__c":"An abnormality of the primary sensation that is mediated by peripheral nerves (pain, temperature, touch, vibration, joint position). The word hypoesthesia (or hypesthesia) refers to a reduction in cutaneous sensation to a specific type of testing.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0003474","HPO_Synonym__c":"Sensory impairment","HPO_Name__c":"Somatic sensory dysfunction","Feature_System__c":"Nervous System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:99947","HPO_Frequency__c":"Very frequent (80-99%)","Feature__r":{"HPO_Description__c":"Evidence of chronic denervation on electromyography.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0003444","HPO_Name__c":"EMG: chronic denervation signs","Feature_System__c":"Musculoskeletal System","HPO_Feature_Type__c":"Procedure_EMG"}},{"Provided_By__c":"ORPHA:99947","HPO_Frequency__c":"Occasional (5-29%)","Feature__r":{"HPO_Description__c":"Upturning of the big toe (and sometimes fanning of the other toes) in response to stimulation of the sole of the foot. If the Babinski sign is present it can indicate damage to the corticospinal tract.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0003487","HPO_Synonym__c":"Extensor plantar reflexes; Extensor plantar response; Extensor plantar responses; Positive Babinski sign","HPO_Name__c":"Babinski sign","Feature_System__c":"Nervous System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:99947","HPO_Frequency__c":"Frequent (30-79%)","Feature__r":{"HPO_Description__c":"An increase in height of the medial longitudinal arch of the foot that does not flatten on weight bearing (i.e., a distinctly hollow form of the sole of the foot when it is bearing weight).","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0001761","HPO_Synonym__c":"Cavus foot; High-arched foot","HPO_Name__c":"Pes cavus","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:99947","HPO_Frequency__c":"Occasional (5-29%)","Feature__r":{"HPO_Description__c":"Muscular atrophy of distal leg muscles.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0008944","HPO_Synonym__c":"Lower leg amyotrophy; Lower limb degeneration; Muscle atrophy, lower limb, distal","HPO_Name__c":"Distal lower limb amyotrophy","Feature_System__c":"Musculoskeletal System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:99947","HPO_Frequency__c":"Occasional (5-29%)","Feature__r":{"HPO_Description__c":"An irresistible urge to move the legs, usually accompanied by unpleasant sensations deep within the limbs. Symptoms typically begin or worsen during periods of rest or inactivity, are most pronounced in the evening or at night, and are temporarily relieved by movement such as walking or stretching. The disturbance often interferes with the initiation or maintenance of sleep.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0012452","HPO_Synonym__c":"Restless legs syndrome; Tachyathetosis","HPO_Name__c":"Restless legs","Feature_System__c":"Nervous System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:99947","HPO_Frequency__c":"Frequent (30-79%)","Feature__r":{"HPO_Description__c":"Inability to elicit tendon reflexes in the lower limbs.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0002522","HPO_Synonym__c":"Absent lower limb tendon reflexes; Areflexia in lower limbs; Areflexia of the lower limbs; Areflexia, lower limbs","HPO_Name__c":"Areflexia of lower limbs","Feature_System__c":"Nervous System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:99947","HPO_Frequency__c":"Very frequent (80-99%)","Feature__r":{"HPO_Description__c":"An axonal neuropathy of peripheral sensory nerves.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0003390","HPO_Synonym__c":"Axonal sensory neuropathy","HPO_Name__c":"Sensory axonal neuropathy","Feature_System__c":"Nervous System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:99947","HPO_Frequency__c":"Frequent (30-79%)","Feature__r":{"HPO_Description__c":"An unintentional, oscillating to-and-fro muscle movement affecting the hand.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0002378","HPO_Synonym__c":"Hand tremor; Tremor of hand; Tremor of hands; tremors in hands","HPO_Name__c":"Hand tremor","Feature_System__c":"Nervous System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:99947","HPO_Frequency__c":"Occasional (5-29%)","Feature__r":{"HPO_Description__c":"An unpleasant sensation characterized by physical discomfort (such as pricking, throbbing, or aching) localized to the arm.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0012513","HPO_Synonym__c":"Upper limb pain","HPO_Name__c":"Upper limb pain","Feature_System__c":"Musculoskeletal System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:99947","HPO_Frequency__c":"Uncommon (<1-4%)","Feature__r":{"HPO_Description__c":"Hydrocephalus is an active distension of the ventricular system of the brain resulting from inadequate passage of CSF from its point of production within the cerebral ventricles to its point of absorption into the systemic circulation.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0000238","HPO_Synonym__c":"Hydrocephaly; Nonsyndromal hydrocephalus; Too much cerebrospinal fluid in the brain","HPO_Name__c":"Hydrocephalus","Feature_System__c":"Nervous System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:99947","HPO_Frequency__c":"Occasional (5-29%)","Feature__r":{"HPO_Description__c":"A type of tremors that is triggered by holding a limb in a fixed position.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0002174","HPO_Name__c":"Postural tremor","Feature_System__c":"Nervous System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:99947","HPO_Frequency__c":"Very frequent (80-99%)","Feature__r":{"HPO_Description__c":"An abnormality of the skeleton of foot.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0001760","HPO_Synonym__c":"Abnormal feet structure; Abnormality of the feet; Abnormality of the foot; Foot deformities; Foot deformity","HPO_Name__c":"Abnormal foot morphology","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:99947","HPO_Frequency__c":"Occasional (5-29%)","Feature__r":{"HPO_Description__c":"Weakness of the quadriceps muscle (that is, of the muscle fasciculus of quadriceps femoris).","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0003731","HPO_Synonym__c":"Quadriceps weakness","HPO_Name__c":"Quadriceps muscle weakness","Feature_System__c":"Musculoskeletal System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:99947","HPO_Frequency__c":"Frequent (30-79%)","Feature__r":{"HPO_Description__c":"Sudden and involuntary contractions of one or more muscles.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0003394","HPO_Synonym__c":"Muscle cramps; Muscle spasms","HPO_Name__c":"Muscle spasm","Feature_System__c":"Musculoskeletal System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:99947","HPO_Frequency__c":"Frequent (30-79%)","Feature__r":{"HPO_Description__c":"Reduced ability to run.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0009046","HPO_Synonym__c":"Difficulty running","HPO_Name__c":"Difficulty running","Feature_System__c":"Musculoskeletal System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:99947","HPO_Frequency__c":"Frequent (30-79%)","Feature__r":{"HPO_Description__c":"A reduced ability to discriminate between different temperatures.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0010829","HPO_Synonym__c":"Abnormality of temperature sensation; Impaired temperature sensation; Impaired thermal sensitivity; Loss of temperature sensation","HPO_Name__c":"Impaired temperature sensation","Feature_System__c":"Nervous System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:99947","HPO_Frequency__c":"Frequent (30-79%)","Feature__r":{"HPO_Description__c":"A decrease in the ability to perceive vibration. Clinically, this is usually tested with a tuning fork which vibrates at 128 Hz and is applied to bony prominences such as the malleoli at the ankles or the metacarpal-phalangeal joints. There is a slow decay of vibration from the tuning fork. The degree of vibratory sense loss can be crudely estimated by counting the number of seconds that the examiner can perceive the vibration longer than the patient.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0002495","HPO_Synonym__c":"Decreased vibration sense; Decreased vibratory sense; Diminished vibratory sense; Hypopallesthesia; Impaired vibratory sensation; Impaired vibratory sense","HPO_Name__c":"Impaired vibratory sensation","Feature_System__c":"Nervous System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:99947","HPO_Frequency__c":"Very frequent (80-99%)","Feature__r":{"HPO_Description__c":"Absence of the Achilles reflex (also known as the ankle jerk reflex), which can normally be elicited by tapping the tendon is tapped while the foot is dorsiflexed.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0003438","HPO_Synonym__c":"Absent ankle reflexes","HPO_Name__c":"Absent Achilles reflex","Feature_System__c":"Nervous System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:99947","HPO_Frequency__c":"Occasional (5-29%)","Feature__r":{"HPO_Description__c":"A loss of the ability to move the vocal folds.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0001605","HPO_Synonym__c":"Inability to move vocal cords; Laryngeal paralysis","HPO_Name__c":"Vocal cord paralysis","Feature_System__c":"Nervous System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:99947","HPO_Frequency__c":"Frequent (30-79%)","Feature__r":{"HPO_Description__c":"An abnormality affecting one or both hands.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0001155","HPO_Synonym__c":"Abnormal hands; Abnormality of the hand; Hand anomalies; Hand deformities","HPO_Name__c":"Abnormality of the hand","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:99947","HPO_Frequency__c":"Uncommon (<1-4%)","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:99947","HPO_Frequency__c":"Occasional (5-29%)","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":"ORPHA:99947","HPO_Frequency__c":"Occasional (5-29%)","Feature__r":{"HPO_Description__c":"A lack of strength in the triceps muscle, which normally is responsible for extending (straightening) the elbow and mediating certain shoulder movements.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0031108","HPO_Name__c":"Triceps weakness","Feature_System__c":"Musculoskeletal System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:99947","HPO_Frequency__c":"Very frequent (80-99%)","Feature__r":{"HPO_Description__c":"Weakness of the muscles responsible for dorsiflexion of the foot, that is, of the movement of the toes towards the shin. The foot dorsiflexors include the tibialis anterior, the extensor hallucis longus, the extensor digitorum longus, and the peroneus tertius muscles.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0009027","HPO_Synonym__c":"Foot drop; Foot extensor weakness; Footdrop; Inability to heel walk; Inability to walk on heels","HPO_Name__c":"Foot dorsiflexor weakness","Feature_System__c":"Musculoskeletal System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:99947","HPO_Frequency__c":"Frequent (30-79%)","Feature__r":{"HPO_Description__c":"Reduced ability to perceive painful stimuli.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0007328","HPO_Synonym__c":"Decreased pain sensation; Decreased pinprick sensation; Impaired pain sensation","HPO_Name__c":"Impaired pain sensation","Feature_System__c":"Nervous System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:99947","HPO_Frequency__c":"Frequent (30-79%)","Feature__r":{"HPO_Description__c":"Reduced strength of the musculature of the hand.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0030237","HPO_Synonym__c":"Hand muscle weakness","HPO_Name__c":"Hand muscle weakness","Feature_System__c":"Musculoskeletal System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:99947","HPO_Frequency__c":"Frequent (30-79%)","Feature__r":{"HPO_Description__c":"Reduced ability to climb stairs.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0003551","HPO_Synonym__c":"Difficulty walking up stairs","HPO_Name__c":"Difficulty climbing stairs","Feature_System__c":"Musculoskeletal System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:99947","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:99947","HPO_Frequency__c":"Frequent (30-79%)","Feature__r":{"HPO_Description__c":"The ankle joint can move, passively and/or actively, beyond normal limits along its physiological axes.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0006460","HPO_Synonym__c":"Increased laxity of ankles","HPO_Name__c":"Ankle hypermobility","Feature_System__c":"Musculoskeletal System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:99947","HPO_Frequency__c":"Occasional (5-29%)","Feature__r":{"HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0006915","HPO_Synonym__c":"Inability to walk by childhood/adolescence","HPO_Name__c":"Inability to walk by childhood/adolescence","Feature_System__c":"Nervous System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:99947","HPO_Frequency__c":"Occasional (5-29%)","Feature__r":{"HPO_Description__c":"An abnormal gait pattern that arises from weakness of the pretibial and peroneal muscles due to a lower motor neuron lesion. Affected patients have footdrop and are unable to dorsiflex and evert the foot. The leg is lifted high on walking so that the toes clear the ground, and there may be a slapping noise when the foot strikes the ground again.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0003376","HPO_Synonym__c":"High stepping","HPO_Name__c":"Steppage gait","Feature_System__c":"Nervous System","HPO_Feature_Type__c":"Symptom"}}],"tags":{"Cause":["Genetics"],"Disease Category":["Genetics","Neurology"],"Specialist":["Genetics","Neurology","Neuromuscular medicine","Pediatrics"],"Account":["Peripheral Neuropathy"]},"synonyms":["autosomal dominant axonal charcot-marie-tooth disease type 2a2"," autosomal dominant charcot-marie-tooth disease type 2a2"," charcot-marie-tooth disease type 2 caused by mutation in mfn2"," charcot-marie-tooth disease type 2a2a"," charcot-marie-tooth disease, axonal, autosomal dominant, type 2a2a"," charcot-marie-tooth disease, axonal, type 2a2"," charcot-marie-tooth disease, axonal, type 2a2a"," charcot-marie-tooth disease, neuronal, type 2a2"," charcot-marie-tooth neuronal type 2a2"," charcot-marie-tooth neuropathy type 2a2"," cmt2a2"," hereditary motor and sensory neuropathy iia2"," hmsn iia2"," hmsn2a2"," mfn2 charcot-marie-tooth disease type 2"]}