Genetic and phenotypic heterogeneity in patients with mandibuloacral dysplasia-associated lipodystrophy

Vinaya Simha, Anil K. Agarwal, Elif Arioglu Oral, Jean Pierre Fryns, Abhimanyu Garg

Research output: Contribution to journalArticle

96 Scopus citations

Abstract

Mandibuloacral dysplasia (MAD) is a phenotypically heterogeneous, rare autosomal recessive disorder characterized by mandibular and clavicular hypoplasia, acroosteolysis, delayed closure of cranial sutures, joint contractures, and mottled cutaneous pigmentation. Patients with MAD develop two patterns of lipodystrophy: type A pattern, with loss of sc fat from the extremities and normal or slight excess in the neck and truncal regions; and type B pattern, with a more generalized loss of sc fat involving the face, trunk, and extremities. Recently, affected patients from five consanguineous Italian pedigrees with partial lipodystrophy (type A) were reported to have a homozygous R527H mutation in LMNA (lamin A/C) gene. We carried out mutational analysis of LMNA in affected patients from six pedigrees. Affected patients from two pedigrees with type A lipodystrophy had the homozygous R527H mutation in LMNA. The other four affected subjects who had type B lipodystrophy did not have any mutation in the exons and splice site junctions of LMNA; RNA extracted from lymphoblasts of two of these patients also revealed normal sequence. In these four subjects, sequencing of other known genes implicated in lipodystrophies, i.e. AGPAT2, Seipin, and PPARG also revealed no substantial alterations. We conclude that MAD is a genetically and phenotypically heterogenous disorder. Besides LMNA gene, other as yet unmapped loci could be linked to MAD.

Original languageEnglish (US)
Pages (from-to)2821-2824
Number of pages4
JournalJournal of Clinical Endocrinology and Metabolism
Volume88
Issue number6
DOIs
StatePublished - Jun 1 2003
Externally publishedYes

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ASJC Scopus subject areas

  • Endocrinology, Diabetes and Metabolism
  • Biochemistry
  • Endocrinology
  • Clinical Biochemistry
  • Biochemistry, medical

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