distal hereditary motor neuronopathy type 2A(redirected from HMN IIA)
distal hereditary motor neuronopathy type 2AAn autosomal recessive neuromuscular disorder (OMIM:158590) caused by selective impairment of motor neurons in the anterior horn of the spinal cord, without sensory deficit (posterior horn). It begins with weakness and wasting of distal muscles of the anterior tibial and peroneal compartments of the legs, later expanding to the proximal leg muscles and/or to the distal upper limbs.
Defects of HSPB8, which encodes a member of the heat shock protein 20 family, cause distal hereditary motor neuropathy 2A.
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