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- W4247996972 abstract "Hereditary myopathy with early respiratory failure (HMERF) and extensive myofibrillar lesions have been described in sporadic and familial cases and linked to various chromosomal regions. We describe the clinical manifestations, muscle histopathology and genetics in eight individuals from three apparently unrelated families with clinical and pathological features of HMERF. All patients had muscle weakness in the pelvic girdle, neck flexors, respiratory and trunk muscles, and the majority had prominent calf hypertrophy. Examination of pulmonary function showed decreased vital capacity. No signs of cardiac muscle involvement were found. Muscle histopathological features included marked muscle fibre size variation, fibre splitting, numerous internal nuclei and fatty infiltration. Frequent groups of fibres showed eosinophilic inclusions and deposits. At the ultrastructural level there were extensive myofibrillar lesions with marked Z-disc alterations. Whole exome sequencing in four individuals from one family revealed a missense mutation, g.274375, T>C; p.Cys30071Arg, in the titin gene, TTN. The mutation, which changes a highly conserved residue in the myosin binding A-band titin, was demonstrated to segregate with the disease in all three families. High density single nucleotide polymorphism arrays covering the entire genome demonstrated sharing of a 699 Mb haplotype, located in chromosome region 2q31 including TTN, indicating common ancestry of this novel and first disease-causing mutation in A-band titin associated with HMERF." @default.
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- W4247996972 date "2012-10-01" @default.
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- W4247996972 title "G.O.2 Hereditary myopathy with early respiratory failure associated with a mutation in A-band titin" @default.
- W4247996972 doi "https://doi.org/10.1016/j.nmd.2012.06.233" @default.
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