Identification of a homozygous VRK1 mutation in two patients with adult-onset distal hereditary motor neuropathy

Lior Greenbaum, Ortal Barel, Vera Nikitin, Adi Hersalis-Eldar, Nitzan Kol, Haike Reznik-Wolf, Dan Dominissini, Elon Pras, Amir Dori

Research output: Contribution to journalArticlepeer-review

Abstract

Background: Adult-onset hereditary motor neuropathies are caused by mutations in multiple genes. Mutations within the vaccinia-related kinase 1 (VRK1) gene were associated with a wide spectrum of recessively inherited motor neuropathies, characterized by childhood to early adulthood age of onset and an occasionally non-lower motor neuron involvement. Methods: We describe two patients with adult-onset (aged 48 and 40 years) length-dependent motor neuropathy from unrelated consanguineous families of Moroccan Jewish descent. One also demonstrated mild nocturnal respiratory difficulty and sensory symptoms. Whole-exome sequencing (WES) was performed. Results: A homozygous mutation in VRK1 (c.1160G>A (p.Arg387His)), shared by both patients, was identified. This rare mutation segregated with the disease in the two families, and was absent in 120 controls of Jewish Moroccan origin. Conclusions: Our findings support VRK1 as a causative gene for adult-onset distal hereditary motor neuropathy, and indicate its relevance for evaluation of individuals with similar motor impairment.

Original languageEnglish
Pages (from-to)395-400
Number of pages6
JournalMuscle and Nerve
Volume61
Issue number3
DOIs
StatePublished - 1 Mar 2020

Keywords

  • VRK1
  • adult-onset neuropathy
  • distal hereditary motor neuropathy
  • distal spinal muscular atrophy
  • whole-exome sequencing

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