Multisystem dystrophy syndrome due to novel missense mutations in the amino-terminal head and alpha-helical rod domains of the lamin A/C gene

Abhimanyu Garg, Rebecca A. Speckman, Anne M. Bowcock

Research output: Contribution to journalArticle

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Abstract

PURPOSE: Mutations in different domains of the LMNA (lamin A/C) gene encoding nuclear envelope proteins lamin A and lamin C cause familial partial lipodystrophy (Dunnigan variety), dilated cardiomyopathy, and autosomal dominant forms of Emery-Dreifuss and limb-girdle muscular dystrophies. The objective of this study was to evaluate LMNA variants in two families with familial partial lipodystrophy (Dunnigan variety) who also had cardiac conduction system defects and other manifestations related to cardiomyopathy. METHODS: We performed mutational analysis of the lamin A/C gene in affected and unaffected subjects by deoxyribonucleic acid sequencing of the exons. RESULTS: Two novel missense mutations were identified in exon 1 of the lamin A/C gene. One mutation, R28W (CGG→TGG), affected the amino-terminal head domain, and the other, R62G (CGC→GGC), affected the α-helical rod domain. Affected subjects from both families had an increased prevalence of cardiac manifestations, such as atrioventricular conduction defects, atrial fibrillation, and heart failure due to ventricular dilatation, as well as pacemaker implantation. The proband from one of the families also had proximal muscle weakness. CONCLUSION: Novel genetic defects in the LMNA gene in two families with the Dunnigan variety of familial partial lipodystrophy, cardiac conduction system defects, and other manifestations related to cardiomyopathy suggest the occurrence of a multisystem dystrophy syndrome due to LMNA mutations.

Original languageEnglish (US)
Pages (from-to)549-555
Number of pages7
JournalAmerican Journal of Medicine
Volume112
Issue number7
DOIs
StatePublished - 2002

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Lamin Type A
Missense Mutation
Head
Familial Partial Lipodystrophy
Genes
Cardiomyopathies
Mutation
Exons
Limb-Girdle Muscular Dystrophies
Muscle Weakness
Nuclear Envelope
Dilated Cardiomyopathy
Nuclear Proteins
Atrial Fibrillation
Dilatation
Heart Failure
DNA

ASJC Scopus subject areas

  • Nursing(all)

Cite this

Multisystem dystrophy syndrome due to novel missense mutations in the amino-terminal head and alpha-helical rod domains of the lamin A/C gene. / Garg, Abhimanyu; Speckman, Rebecca A.; Bowcock, Anne M.

In: American Journal of Medicine, Vol. 112, No. 7, 2002, p. 549-555.

Research output: Contribution to journalArticle

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abstract = "PURPOSE: Mutations in different domains of the LMNA (lamin A/C) gene encoding nuclear envelope proteins lamin A and lamin C cause familial partial lipodystrophy (Dunnigan variety), dilated cardiomyopathy, and autosomal dominant forms of Emery-Dreifuss and limb-girdle muscular dystrophies. The objective of this study was to evaluate LMNA variants in two families with familial partial lipodystrophy (Dunnigan variety) who also had cardiac conduction system defects and other manifestations related to cardiomyopathy. METHODS: We performed mutational analysis of the lamin A/C gene in affected and unaffected subjects by deoxyribonucleic acid sequencing of the exons. RESULTS: Two novel missense mutations were identified in exon 1 of the lamin A/C gene. One mutation, R28W (CGG→TGG), affected the amino-terminal head domain, and the other, R62G (CGC→GGC), affected the α-helical rod domain. Affected subjects from both families had an increased prevalence of cardiac manifestations, such as atrioventricular conduction defects, atrial fibrillation, and heart failure due to ventricular dilatation, as well as pacemaker implantation. The proband from one of the families also had proximal muscle weakness. CONCLUSION: Novel genetic defects in the LMNA gene in two families with the Dunnigan variety of familial partial lipodystrophy, cardiac conduction system defects, and other manifestations related to cardiomyopathy suggest the occurrence of a multisystem dystrophy syndrome due to LMNA mutations.",
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N2 - PURPOSE: Mutations in different domains of the LMNA (lamin A/C) gene encoding nuclear envelope proteins lamin A and lamin C cause familial partial lipodystrophy (Dunnigan variety), dilated cardiomyopathy, and autosomal dominant forms of Emery-Dreifuss and limb-girdle muscular dystrophies. The objective of this study was to evaluate LMNA variants in two families with familial partial lipodystrophy (Dunnigan variety) who also had cardiac conduction system defects and other manifestations related to cardiomyopathy. METHODS: We performed mutational analysis of the lamin A/C gene in affected and unaffected subjects by deoxyribonucleic acid sequencing of the exons. RESULTS: Two novel missense mutations were identified in exon 1 of the lamin A/C gene. One mutation, R28W (CGG→TGG), affected the amino-terminal head domain, and the other, R62G (CGC→GGC), affected the α-helical rod domain. Affected subjects from both families had an increased prevalence of cardiac manifestations, such as atrioventricular conduction defects, atrial fibrillation, and heart failure due to ventricular dilatation, as well as pacemaker implantation. The proband from one of the families also had proximal muscle weakness. CONCLUSION: Novel genetic defects in the LMNA gene in two families with the Dunnigan variety of familial partial lipodystrophy, cardiac conduction system defects, and other manifestations related to cardiomyopathy suggest the occurrence of a multisystem dystrophy syndrome due to LMNA mutations.

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