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Extreme phenotypic diversity and nonpenetrance in families with the LMNA gene mutation R644C

Lookup NU author(s): Anne Hattersley, Dr John Hudson, Professor Mark Walker


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Mutations in the LMNA gene result in diverse phenotypes including Emery Dreifuss muscular dystrophy, limb girdle muscular dystrophy, dilated cardiomyopathy with conduction system disease, Dunnigan type familial partial lipodystrophy, mandibulo acral dysplasia, Hutchinson Gilford progeria syndrome, restrictive dermopathy and autosomal recessive Charcot Marie Tooth type 2. The c.1930C > T (R644C) missense mutation has previously been reported in eight unrelated patients with variable features including left ventricular hypertrophy, limb girdle muscle weakness, dilated cardiomyopathy and atypical progeria. Here we report on the details of nine additional patients in eight families with this mutation. Patients 1 and 2 presented with lipodystrophy and insulin resistance, Patient 1 having in addition focal segmental glomerulosclerosis. Patient 3 presented with motor neuropathy, Patient 4 with arthrogryposis and dilated cardiomyopathy with left ventricular non-compaction, Patient 5 with severe scoliosis and contractures, Patient 6 with limb girdle weakness and Patient 7 with hepatic steatosis and insulin resistance. Patients 8 and 9 are brothers with proximal weakness and contractures. Nonpenetrance was observed frequently in first degree relatives. This report provides further evidence of the extreme phenotypic diversity and low penetrance associated with the R644C mutation. Possible explanations for these observations are discussed. © 2008 Wiley-Liss, Inc.

Publication metadata

Author(s): Rankin J, Auer-Grumbach M, Bagg W, Colclough K, Duong NT, Fenton-May J, Hattersley A, Hudson J, Jardine P, Josifova D, Longman C, McWilliam R, Owen K, Walker M, Wehnert M, Ellard S

Publication type: Article

Publication status: Published

Journal: American Journal of Medical Genetics. Part A

Year: 2008

Volume: 146

Issue: 12

Pages: 1530-1542

ISSN (print): 1552-4825

ISSN (electronic): 1552-4833

Publisher: John Wiley & Sons, Inc.


DOI: 10.1002/ajmg.a.32331

PubMed id: 18478590


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Funder referenceFunder name
DHCS/07/07/008Department of Health