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Neuromuscul Disord. 2014 Feb;24(2):156-61. doi: 10.1016/j.nmd.2013.10.010. Epub 2013 Nov 11.

Exome sequencing identifies Laing distal myopathy MYH7 mutation in a Roma family previously diagnosed with distal neuronopathy.

Author information

1
Department of Medical Genetics, Szentágothai Research Center, University of Pécs, Pécs, Hungary. Electronic address: komlosi.katalin@pte.hu.
2
Department of Medical Genetics, Szentágothai Research Center, University of Pécs, Pécs, Hungary.
3
Institute of Human Genetics, University of Cologne, 50931 Cologne, Germany; Institute for Genetics, University of Cologne, 50674 Cologne, Germany; Center for Molecular Medicine Cologne, University of Cologne, 50931 Cologne, Germany.
4
Neurology Clinic, University of Pécs, Pécs, Hungary.
5
deCODE Genetics, Reykjavik, Iceland.

Abstract

We describe a Hungarian Roma family, originally investigated for autosomal dominant distal muscular atrophy. The mother started toe walking at 3 years and lost ambulation at age 27. Her three daughters presented with early steppage gait and showed variable progression. Muscle biopsies were nonspecific showing myogenic lesions in the mother and lesions resembling neurogenic atrophy in the two siblings. To identify the causative abnormality whole exome sequencing was performed in two affected girls and their unaffected father, unexpectedly revealing the MYH7 mutation c.4849_4851delAAG (p.K1617del) in both girls, reported to be causative for Laing distal myopathy. Sanger sequencing confirmed the mutation in the affected mother and third affected daughter. In line with variable severity in Laing distal myopathy our patients presented a more severe phenotype. Our case is the first demonstration of Laing distal myopathy in the Roma and the successful use of whole exome sequencing in obtaining a definitive diagnosis in ambiguous cases.

KEYWORDS:

Distal myopathy; Laing distal myopathy; MYH7; Myosinopathies; Whole exome sequencing

PMID:
24300783
DOI:
10.1016/j.nmd.2013.10.010
[Indexed for MEDLINE]

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