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Autosomal dominant myopathy: missense mutation (Glu-706 --> Lys) in the myosin heavy chain IIa gene.

Artikel i vetenskaplig tidskrift
Författare Tommy Martinsson
Anders Oldfors
Niklas Darin
Kerstin Berg
Homa Tajsharghi
Mårten Kyllerman
J. Wahlstrom
Publicerad i Proceedings of the National Academy of Sciences of the United States of America
Volym 97
Nummer/häfte 26
Sidor 14614-9
ISSN 0027-8424
Publiceringsår 2000
Publicerad vid Institutionen för laboratoriemedicin , Avdelningen för patologi
Institutionen för kvinnors och barns hälsa, Avdelningen för pediatrik
Sidor 14614-9
Språk en
Länkar dx.doi.org/10.1073/pnas.250289597
Ämnesord Adult, Amino Acid Sequence, Animals, Child, Female, Genetic Diseases, Inborn, genetics, Glutamic Acid, genetics, Humans, Lysine, genetics, Male, Microscopy, Electron, methods, Middle Aged, Molecular Sequence Data, Molecular Structure, Muscular Diseases, enzymology, genetics, Mutation, Missense, Myosin Heavy Chains, chemistry, genetics, Myosins, analysis, NADH Tetrazolium Reductase, analysis, Pedigree, Staining and Labeling, methods
Ämneskategorier Molekylär medicin

Sammanfattning

We here report on a human myopathy associated with a mutation in a fast myosin heavy chain (MyHC) gene, and also the genetic defect in a hereditary inclusion body myopathy. The disorder has previously been described in a family with an "autosomal dominant myopathy, with joint contractures, ophthalmoplegia, and rimmed vacuoles." Linkage analysis and radiation hybrid mapping showed that the gene locus (Human Genome Map locus name: IBM3) is situated in a 2-Mb region of chromosome 17p13, where also a cluster of MyHC genes is located. These include the genes encoding embryonic, IIa, IIx/d, IIb, perinatal, and extraocular MyHCs. Morphological analysis of muscle biopsies from patients from the family indicated to us that the type 2A fibers frequently were abnormal, whereas other fiber types appeared normal. This observation prompted us to investigate the MyHC-IIa gene, since MyHC-IIa is the major isoform in type 2A fibers. The complete genomic sequence for this gene was deduced by using an "in silico" strategy. The gene, found to consist of 38 exons, was subjected to a complete mutation scan in patients and controls. We identified a missense mutation, Glu-706 --> Lys, which is located in a highly conserved region of the motor domain, the so-called SH1 helix region. By conformational changes this region communicates activity at the nucleotide-binding site to the neck region, resulting in the lever arm swing. The mutation in this region is likely to result in a dysfunctional myosin, compatible with the disorder in the family.

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