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Charcot-Marie-Tooth disease axonal type 2V(CMT2V)

MedGen UID:
1800473
Concept ID:
C5569050
Disease or Syndrome
Synonyms: CHARCOT-MARIE-TOOTH DISEASE, AXONAL, AUTOSOMAL DOMINANT, TYPE 2V; CHARCOT-MARIE-TOOTH NEUROPATHY, TYPE 2V
SNOMED CT: Autosomal dominant Charcot-Marie-Tooth disease type 2V (1187618009); Hereditary adult onset painful axonal polyneuropathy (1187618009); Autosomal dominant Charcot-Marie-Tooth disease type 2 due to NAGLU mutation (1187618009); Autosomal dominant Charcot-Marie-Tooth disease type 2 due to NAGLU (N-acetyl-alpha-glucosaminidase) mutation (1187618009)
Modes of inheritance:
Autosomal dominant inheritance
MedGen UID:
141047
Concept ID:
C0443147
Intellectual Product
Source: Orphanet
A mode of inheritance that is observed for traits related to a gene encoded on one of the autosomes (i.e., the human chromosomes 1-22) in which a trait manifests in heterozygotes. In the context of medical genetics, an autosomal dominant disorder is caused when a single copy of the mutant allele is present. Males and females are affected equally, and can both transmit the disorder with a risk of 50% for each child of inheriting the mutant allele.
 
Gene (location): NAGLU (17q21.2)
 
Monarch Initiative: MONDO:0014665
OMIM®: 616491
Orphanet: ORPHA447964

Definition

A rare axonal hereditary motor and sensory neuropathy characterized by adult onset of recurrent pain in legs with or without cramps, progressive loss of deep tendon reflexes and vibration sense, paresthesia in the feet and later in the hands. Patients often experience sleep disturbances and mild sensory ataxia. [from SNOMEDCT_US]

Clinical features

From HPO
Lower limb pain
MedGen UID:
6033
Concept ID:
C0023222
Sign or Symptom
An unpleasant sensation characterized by physical discomfort (such as pricking, throbbing, or aching) localized to the leg.
Paresthesia
MedGen UID:
14619
Concept ID:
C0030554
Disease or Syndrome
Abnormal sensations such as tingling, pricking, or numbness of the skin with no apparent physical cause.
Peripheral neuropathy
MedGen UID:
18386
Concept ID:
C0031117
Disease or Syndrome
Peripheral neuropathy is a general term for any disorder of the peripheral nervous system. The main clinical features used to classify peripheral neuropathy are distribution, type (mainly demyelinating versus mainly axonal), duration, and course.
Sleep abnormality
MedGen UID:
52372
Concept ID:
C0037317
Finding
An abnormal pattern in the quality, quantity, or characteristics of sleep.
Sensory ataxia
MedGen UID:
66020
Concept ID:
C0240991
Sign or Symptom
Incoordination of movement caused by a deficit in the sensory nervous system. Sensory ataxia can be distinguished from cerebellar ataxia by asking the patient to close his or her eyes. Persons with cerebellar ataxia show only a minimal worsening of symptoms, whereas persons with sensory ataxia show a marked worsening of symptoms.
Hyporeflexia
MedGen UID:
195967
Concept ID:
C0700078
Finding
Reduction of neurologic reflexes such as the knee-jerk reaction.
Impaired vibratory sensation
MedGen UID:
220959
Concept ID:
C1295585
Finding
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.
Distal sensory impairment
MedGen UID:
335722
Concept ID:
C1847584
Finding
An abnormal reduction in sensation in the distal portions of the extremities.
Muscle weakness
MedGen UID:
57735
Concept ID:
C0151786
Finding
Reduced strength of muscles.
Nystagmus
MedGen UID:
45166
Concept ID:
C0028738
Disease or Syndrome
Rhythmic, involuntary oscillations of one or both eyes related to abnormality in fixation, conjugate gaze, or vestibular mechanisms.

Term Hierarchy

CClinical test,  RResearch test,  OOMIM,  GGeneReviews,  VClinVar  
  • CROGVCharcot-Marie-Tooth disease axonal type 2V

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