Mutations in the J domain of DNAJB6 cause dominant distal myopathy

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Palmio , J , Jonson , P H , Inoue , M , Sarparanta , J , Bengoechea , R , Savarese , M , Vihola , A , Jokela , M , Nakagawa , M , Noguchi , S , Olivé , M , Masingue , M , Kerty , E , Hackman , P , Weihl , C C , Nishino , I & Udd , B 2020 , ' Mutations in the J domain of DNAJB6 cause dominant distal myopathy ' , Neuromuscular Disorders , vol. 30 , no. 1 , pp. 38-46 .

Title: Mutations in the J domain of DNAJB6 cause dominant distal myopathy
Author: Palmio, Johanna; Jonson, Per Harald; Inoue, Michio; Sarparanta, Jaakko; Bengoechea, Rocio; Savarese, Marco; Vihola, Anna; Jokela, Manu; Nakagawa, Masanori; Noguchi, Satoru; Olivé, Montse; Masingue, Marion; Kerty, Emilia; Hackman, Peter; Weihl, Conrad C.; Nishino, Ichizo; Udd, Bjarne
Contributor organization: Department of Medical and Clinical Genetics
University of Helsinki
Date: 2020-01
Language: eng
Number of pages: 9
Belongs to series: Neuromuscular Disorders
ISSN: 0960-8966
Abstract: 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.
Subject: 3112 Neurosciences
DNAJB6 gene
Limb-girdle muscular dystrophy
DNAJB6 gene
Limb-girdle muscular dystrophy
3124 Neurology and psychiatry
Peer reviewed: Yes
Rights: cc_by_nc_nd
Usage restriction: openAccess
Self-archived version: acceptedVersion

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