Document Detail

A novel homozygous Ala529Val LMNA mutation in Turkish patients with mandibuloacral dysplasia.
MedLine Citation:
PMID:  15998779     Owner:  NLM     Status:  MEDLINE    
CONTEXT: 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, lipodystrophy, and mottled cutaneous pigmentation. MAD patients with type A lipodystrophy with loss of sc fat from the extremities and normal or slight excess in the neck and truncal regions have been previously reported to carry a homozygous Arg527His mutation in LMNA (Lamin A/C) gene. Among those with type B pattern of lipodystrophy with generalized loss of sc fat, we recently reported a patient carrying compound heterozygous mutations in an endoprotease, zinc metalloproteinase (ZMPSTE24), gene that is involved in posttranslational processing of prelamin A to mature lamin A. OBJECTIVE: Our objective was to carry out mutational analysis of LMNA in additional patients with MAD and type A lipodystrophy. DESIGN AND SETTING: We studied descriptive case reports at a referral center. PATIENTS: Subjects were a male and a female patient with MAD who belonged to two pedigrees from Turkey. MAIN OUTCOME MEASURES: We assessed genotype-phenotype relationships. RESULTS: We now report that both these patients have a novel homozygous missense mutation (c.1586C-->T; c refers to cDNA reference sequence) in LMNA that replaces a well-conserved residue alanine at position 529 to valine. Intragenic single-nucleotide polymorphisms revealed a common haplotype spanning 2.5 kb around the mutated nucleotide in the parents of both the affected subjects, suggesting ancestral origin of the mutation. The female patient had no breast development despite normal menstruation, a phenotype different from that seen in women with MAD and Arg527His LMNA mutation. CONCLUSIONS: We conclude that two homozygous missense LMNA mutations involving the arginine 527 and alanine 529 residues cause MAD with subtle variations in phenotype.
Abhimanyu Garg; Ozgur Cogulu; Ferda Ozkinay; Huseyin Onay; Anil K Agarwal
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Publication Detail:
Type:  Case Reports; Journal Article; Review     Date:  2005-07-05
Journal Detail:
Title:  The Journal of clinical endocrinology and metabolism     Volume:  90     ISSN:  0021-972X     ISO Abbreviation:  J. Clin. Endocrinol. Metab.     Publication Date:  2005 Sep 
Date Detail:
Created Date:  2005-09-08     Completed Date:  2005-10-06     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0375362     Medline TA:  J Clin Endocrinol Metab     Country:  United States    
Other Details:
Languages:  eng     Pagination:  5259-64     Citation Subset:  AIM; IM    
Division of Nutrition and Metabolic Diseases, Department of Internal Medicine, University of Texas Southwestern Medical Center, 5323 Harry Hines Boulevard, Dallas, Texas 75390-9052, USA.
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MeSH Terms
Abnormalities, Multiple / genetics
Bone and Bones / abnormalities*,  radiography
Breast / abnormalities
Craniofacial Abnormalities / genetics*,  pathology
DNA Mutational Analysis
Growth Disorders / genetics*
Lamin Type A
Lamins / genetics*
Mutation, Missense
Polymorphism, Single Nucleotide
Skin Diseases / genetics*
Reg. No./Substance:
0/LMNA protein, human; 0/Lamin Type A; 0/Lamins; 56-41-7/Alanine; 7004-03-7/Valine

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