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A clinical phenotype of distal hereditary motor neuronopathy type II with a novel HSPB1 mutation

Yoshihisa Ikeda1, Akiko Abe, Chiho Ishida

  • 1Department of Neurology and Neurobiology of Aging, Kanazawa University Graduate School of Medical Science, Kanazawa, Japan. yoshi-i@med.kanazawa-u.ac.jp

Journal of the Neurological Sciences
|October 28, 2008
PubMed

Insights

Researchers identified a new HSPB1 gene mutation causing distal hereditary motor neuronopathy type II (distal HMN II). This genetic finding links to late-onset muscle weakness and potential autonomic dysfunction.

Area of Science:

  • Genetics
  • Neurology
  • Molecular Biology

Background:

  • Distal hereditary motor neuronopathy type II (distal HMN II) is a rare neurological disorder.
  • The heat-shock 27-kDa protein 1 gene (HSPB1/HSP27) is known to be involved in neuronal function and stress response.

Observation:

  • A Japanese family presented with a late-onset, progressive distal HMN II phenotype.
  • The proband, diagnosed with diabetes mellitus (DM), exhibited distal wasting and weakness, along with severe autonomic dysfunction.
  • Affected family members, including the father and grandfather, showed slowly progressive, limb-wide muscular wasting and weakness later in life.

Findings:

  • A novel K141Q mutation in the HSPB1 gene was identified in the affected family members.
  • This specific mutation (K141Q) in HSPB1 appears to be associated with the late-onset distal HMN II clinical presentation.
  • The proband's severe autonomic disturbances might be linked to the HSPB1 mutation, although uncontrolled DM is also a contributing factor.

Implications:

  • This discovery expands the known genetic causes of distal HMN II.
  • The findings suggest a potential role for HSPB1 mutations in both motor neuron degeneration and autonomic dysfunction.
  • Further research into HSPB1's function could reveal new therapeutic targets for motor neuron diseases.

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