{"Name":"Charcot-Marie-Tooth disease type 4B3","DiseaseID__c":"GARD:0017578","id":17578,"encodedName":"charcot-marie-tooth-disease-type-4b3","IsDeleted":false,"Disease_Name_Full__c":"Charcot-Marie-Tooth disease type 4B3","Xref_IDs__c":"763345008; C190871; C3695063; DOID:0110194; MEDGEN:811329; MONDO:0014117; OMIM:615284; ORPHA:363981","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":8,"No_of_Age_at_Onset__c":1,"Description_Source__c":"MONDO:0014117","Disease_Description__c":"Charcot-Marie-Tooth disease type 4B3 (CMT4B3) is a subtype of Charcot-Marie-Tooth type 4 characterized by a childhood onset of slowly progressing, demyelinating sensorimotor neuropathy, focally folded myelin sheaths in nerve biopsy, reduced nerve conduction velocities (less than 38 m/s), and the typical CMT phenotype (i.e. distal muscle weakness and atrophy, and sensory loss).","GARD_Name__c":"Charcot-Marie-Tooth disease type 4B3","GARD_Synonym__c":"charcot-marie-tooth disease type 4 caused by mutation in sbf1; charcot-marie-tooth disease with focally folded myelin; charcot-marie-tooth disease, demyelinating, type 4b3; charcot-marie-tooth neuropathy type 4b3; charcot-marie-tooth neuropathy type 4b3 (cmt4b3); cmt4b3; sbf1 charcot-marie-tooth disease type 4","Curated_Disease_Description_Source__c":"MONDO:0014117","Curated_Disease_Description__c":"Charcot-Marie-Tooth disease type 4B3 (CMT4B3) is a subtype of Charcot-Marie-Tooth type 4 characterized by a childhood onset of slowly progressing, demyelinating sensorimotor neuropathy, focally folded myelin sheaths in nerve biopsy, reduced nerve conduction velocities (less than 38 m/s), and the typical CMT phenotype (i.e. distal muscle weakness and atrophy, and sensory loss).","Curated_USA_Estimate_Source__c":null,"Curated_USA_Estimate__c":"1,000","Age_at_Onset_Snippet_Text__c":"as a Child","SourceID__c":"ORPHA:363981","Deprecated__c":"No","Disease_Concept_Type__c":"Rare Disease Entity","MONDO_ID__c":"MONDO:0014117","ORPHANET_ID__c":"ORPHA:363981","Replaced_By_ID__c":null,"Display_Spanish_Disease_Name__c":"Enfermedad de charcot-marie-tooth tipo 4b3","Spanish_Description_Source__c":"ORPHA:363981","Spanish_Description__c":"La enfermedad de Charcot-Marie-Tooth tipo 4B3 (CMT4B3) es un subtipo de la enfermedad de Charcot-Marie-Tooth tipo 4 caracterizado por una neuropatía sensitivo-motora desmielinizante lentamente progresiva de inicio en la infancia, plegamiento focal de las vainas de mielina en biopsias de nervio, velocidades de conducción nerviosa reducida (menos de 38 m/s) y fenotipo típico de CMT (es decir, debilidad y atrofia muscular distal, y pérdida sensorial).","Spanish_Disease_Name__c":"enfermedad de charcot-marie-tooth tipo 4b3","Spanish_GARD_Synonym__c":"cmt4b3; enfermedad de charcot-marie-tooth con focos de mielina plegada","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":"Charcot-Marie-Tooth disease type 4B3 (CMT4B3) is a subtype of Charcot-Marie-Tooth type 4 characterized by a childhood onset of slowly progressing, demyelinating sensorimotor neuropathy, focally folded myelin sheaths in nerve biopsy, reduced nerve conduction velocities (less than 38 m/s), and the typical CMT phenotype (i.e. distal muscle weakness and atrophy, and sensory loss).","Curated_Disease_Description_Source__c":"MONDO:0014117","GARD_Synonym__c":"charcot-marie-tooth disease type 4 caused by mutation in sbf1; charcot-marie-tooth disease with focally folded myelin; charcot-marie-tooth disease, demyelinating, type 4b3; charcot-marie-tooth neuropathy type 4b3; charcot-marie-tooth neuropathy type 4b3 (cmt4b3); cmt4b3; sbf1 charcot-marie-tooth disease type 4","Name":"Charcot-Marie-Tooth disease type 4B3","Curated_USA_Estimate__c":"1,000","estimateUsa":"1,000"}],"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":"CMT4B3 Research Foundation","Website__c":"https://www.cmt4b3research.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:363981"}],"External_Identifier_Disease__c":[{"URL__c":"https://browser.ihtsdotools.org/?perspective=full&conceptId1=763345008","Source__c":"C3695063; MONDO:0014117","Xref__c":"763345008"},{"URL__c":"https://uts.nlm.nih.gov/uts/umls/concept/C3695063","Source__c":"C3695063","Xref__c":"C3695063"},{"URL__c":"https://www.ebi.ac.uk/ols4/ontologies/doid/classes?obo_id=DOID%3A0110194","Source__c":"MONDO:0014117","Xref__c":"DOID:0110194"},{"URL__c":"https://www.omim.org/entry/615284","Source__c":"C3695063; MONDO:0014117; ORPHA:363981","Xref__c":"OMIM:615284"},{"URL__c":"https://www.ncbi.nlm.nih.gov/medgen/?term=811329","Source__c":"C3695063","Xref__c":"MEDGEN:811329"},{"URL__c":"https://www.orpha.net/en/disease/detail/363981","Source__c":"C3695063; MONDO:0014117; ORPHA:363981","Xref__c":"ORPHA:363981"},{"URL__c":"http://purl.obolibrary.org/obo/MONDO_0014117","Source__c":"GARD:0017578","Xref__c":"MONDO:0014117"},{"URL__c":"https://evsexplore.semantics.cancer.gov/evsexplore/concept/ncit/C190871","Source__c":"C3695063","Xref__c":"C190871"}],"GARD_Disease_Gene__c":[{"GeneSymbol__c":"SBF1","Gene_Type__c":"protein-coding gene","Causal_Gene__c":true}],"Inheritance__c":["Autosomal recessive"],"GARD_Disease_Feature__c":[{"Provided_By__c":"OMIM:615284","HPO_Frequency__c":"Very frequent (80-99%)","Feature__r":{"HPO_Description__c":"Fine, rapid twitching of individual muscle fibers with little or no movement of the muscle as a whole as ascertained by electromyography (EMG). If a motor neuron or its axon is destroyed, the muscle fibers it innervates undergo denervation atrophy. This leads to hypersensitivity of individual muscle fibers to acetyl choline so that they may contract spontaneously. Isolated activity of individual muscle fibers is generally so fine it cannot be seen through the intact skin, although it can be recorded as a short-duration spike in the EMG.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0010546","HPO_Synonym__c":"EMG: fibrillations on electromyogram","HPO_Name__c":"Muscle fibrillation","Feature_System__c":"Nervous System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"OMIM:615284","HPO_Frequency__c":"Occasional (5-29%)","Feature__r":{"HPO_Description__c":"A misalignment of the eyes so that the visual axes deviate from bifoveal fixation. The classification of strabismus may be based on a number of features including the relative position of the eyes, whether the deviation is latent or manifest, intermittent or constant, concomitant or otherwise and according to the age of onset and the relevance of any associated refractive error.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0000486","HPO_Synonym__c":"Cross-eyed; Squint; Squint eyes","HPO_Name__c":"Strabismus","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"OMIM:615284","HPO_Frequency__c":"Occasional (5-29%)","Feature__r":{"HPO_Description__c":"Partial or complete wasting (loss) of brain tissue that was once present.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0012444","HPO_Synonym__c":"Brain degeneration; Brain wasting","HPO_Name__c":"Brain atrophy","Feature_System__c":"Nervous System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"OMIM:615284","HPO_Frequency__c":"Very frequent (80-99%)","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":"OMIM:615284","HPO_Frequency__c":"Very frequent (80-99%)","Feature__r":{"HPO_Description__c":"A reduction in the speed at which electrical signals propagate along the axon of a neuron.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0000762","HPO_Synonym__c":"Decreased NCV; Decreased nerve conduction velocities; Delayed nerve conduction velocity; Reduced nerve conduction velocities; Slow nerve conduction velocity; Slowed nerve conduction velocities","HPO_Name__c":"Decreased nerve conduction velocity","Feature_System__c":"Nervous System","HPO_Feature_Type__c":"Procedure_NCV"}},{"Provided_By__c":"OMIM:615284","HPO_Frequency__c":"Very frequent (80-99%)","Feature__r":{"HPO_Description__c":"Repeated episodes of segmental demyelination and remyelination lead to the accumulation of supernumerary Schwann cells around axons, which is referred to as onion bulb formation. This finding affects peripheral nerves.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0003383","HPO_Name__c":"Onion bulb formation","Feature_System__c":"Nervous System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"OMIM:615284","HPO_Frequency__c":"Frequent (30-79%)","Feature__r":{"HPO_Description__c":"Inability to walk in a person who previous had the ability to walk.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0002505","HPO_Synonym__c":"Loss of ability to walk","HPO_Name__c":"Loss of ambulation","Feature_System__c":"Nervous System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"OMIM:615284","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":"OMIM:615284","HPO_Frequency__c":"Very frequent (80-99%)","Feature__r":{"HPO_Description__c":"The presence of excessive redundant myelin in the peripheral nerve sheath.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0004336","HPO_Synonym__c":"Excessive focal folding of myelin sheaths; Irregular myelin foldings","HPO_Name__c":"Myelin outfoldings","Feature_System__c":"Nervous System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"OMIM:615284","HPO_Frequency__c":"Very frequent (80-99%)","Feature__r":{"HPO_Description__c":"Weakness of the muscles of the arms.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0003484","HPO_Synonym__c":"Decreased arm strength; Weak arm","HPO_Name__c":"Upper limb muscle weakness","Feature_System__c":"Musculoskeletal System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"OMIM:615284","HPO_Frequency__c":"Very frequent (80-99%)","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":"OMIM:615284","HPO_Frequency__c":"Occasional (5-29%)","Feature__r":{"HPO_Description__c":"Paralysis of one or more extraocular muscles that are responsible for eye movements.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0000602","HPO_Synonym__c":"Eye muscle paralysis; Paralysis of extraocular eye movement","HPO_Name__c":"Ophthalmoplegia","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"OMIM:615284","HPO_Frequency__c":"Occasional (5-29%)","Feature__r":{"HPO_Description__c":"Webbing or fusion of the fingers or toes, involving soft parts only or including bone structure. Bony fusions are referred to as \\\"bony\\\" syndactyly if the fusion occurs in a radio-ulnar axis. Fusions of bones of the fingers or toes in a proximo-distal axis are referred to as \\\"symphalangism\\\".","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0001159","HPO_Synonym__c":"Webbed fingers or toes","HPO_Name__c":"Syndactyly","Feature_System__c":"Musculoskeletal System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"OMIM:615284","HPO_Frequency__c":"Very frequent (80-99%)","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:615284","HPO_Frequency__c":"Very frequent (80-99%)","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":"OMIM:615284","HPO_Frequency__c":"Very frequent (80-99%)","Feature__r":{"HPO_Description__c":"Weakness of the muscles of the legs.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0007340","HPO_Synonym__c":"Leg weakness; Lower extremity weakness; Lower limb muscle weakness; Lower limb weakness; Muscle weakness in lower limbs","HPO_Name__c":"Lower limb muscle weakness","Feature_System__c":"Musculoskeletal System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"OMIM:615284","HPO_Frequency__c":"Occasional (5-29%)","Feature__r":{"HPO_Description__c":"Loss of the ability to control the urinary bladder leading to involuntary urination.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0000020","HPO_Synonym__c":"Bladder incontinence; Loss of bladder control","HPO_Name__c":"Urinary incontinence","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"OMIM:615284","HPO_Frequency__c":"Very frequent (80-99%)","Feature__r":{"HPO_Description__c":"A foot where the longitudinal arch of the foot is in contact with the ground or floor when the individual is standing; or, in a patient lying supine, a foot where the arch is in contact with the surface of a flat board pressed against the sole of the foot by the examiner with a pressure similar to that expected from weight bearing; or, the height of the arch is reduced.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0001763","HPO_Synonym__c":"Flat feet; Flat foot","HPO_Name__c":"Pes planus","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"OMIM:615284","Feature__r":{"HPO_Description__c":"Head circumference below 2 standard deviations below the mean for age and sex.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0000252","HPO_Synonym__c":"Abnormally small cranium; Abnormally small skull; Decreased circumference of cranium; Decreased size of cranium; Decreased size of skull; Reduced head circumference; small cranium; Small head circumference","HPO_Name__c":"Microcephaly","Feature_System__c":"Nervous System; Musculoskeletal System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"OMIM:615284","HPO_Frequency__c":"Very frequent (80-99%)","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"}}],"tags":{"Cause":["Genetics"],"Disease Category":["Genetics","Neurology"],"Specialist":["Genetics","Neurology","Neuromuscular medicine","Pediatrics"],"Account":["Peripheral Neuropathy"]},"synonyms":["charcot-marie-tooth disease type 4 caused by mutation in sbf1"," charcot-marie-tooth disease with focally folded myelin"," charcot-marie-tooth disease, demyelinating, type 4b3"," charcot-marie-tooth neuropathy type 4b3"," charcot-marie-tooth neuropathy type 4b3 (cmt4b3)"," cmt4b3"," sbf1 charcot-marie-tooth disease type 4"]}