Mutations in the J domain of DNAJB6 cause dominant distal myopathy

Johanna Palmio, Per Harald Jonson, Michio Inoue, Jaakko Sarparanta, Rocio Bengoechea, Marco Savarese, Anna Vihola, Manu Jokela, Masanori Nakagawa, Satoru Noguchi, Montse Olivé, Marion Masingue, Emilia Kerty, Peter Hackman, Conrad C. Weihl, Ichizo Nishino, Bjarne Udd

Tutkimustuotos: ArtikkelijulkaisuArtikkeliTieteellinenvertaisarvioitu

Abstrakti

Eight patients from five families with undiagnosed dominant distal myopathy underwent clinical, neurophysiological and muscle biopsy examinations. Molecular genetic studies were performed using targeted sequencing of all known myopathy genes followed by segregation of the identified mutations in the affected families using Sanger sequencing. Two novel mutations in DNAJB6 J domain, c.149C>T (p.A50V) and c.161A>C (p.E54A), were identified as the cause of disease. The muscle involvement with p.A50V was distal calf-predominant, and the p.E54A was more proximo-distal. Histological findings were similar to those previously reported in DNAJB6 myopathy. In line with reported pathogenic mutations in the glycine/phenylalanine (G/F) domain of DNAJB6, both the novel mutations showed reduced anti-aggregation capacity by filter trap assay and TDP-43 disaggregation assays. Modeling of the protein showed close proximity of the mutated residues with the G/F domain. Myopathy-causing mutations in DNAJB6 are not only located in the G/F domain, but also in the J domain. The identified mutations in the J domain cause dominant distal and proximo-distal myopathy, confirming that mutations in DNAJB6 should be considered in distal myopathy cases.
Alkuperäiskielienglanti
LehtiNeuromuscular Disorders
Vuosikerta30
Numero1
Sivut38-46
Sivumäärä9
ISSN0960-8966
DOI - pysyväislinkit
TilaJulkaistu - tammik. 2020
OKM-julkaisutyyppiA1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä, vertaisarvioitu

Tieteenalat

  • 3112 Neurotieteet
  • DNAJB6 gene
  • Limb-girdle muscular dystrophy
  • Chaperonopathy
  • 3124 Neurologia ja psykiatria

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