Document Detail

Protein and DNA analysis for the prenatal diagnosis of alpha2-laminin-deficient congenital muscular dystrophy.
MedLine Citation:
PMID:  15322429     Owner:  NLM     Status:  MEDLINE    
Congenital muscular dystrophies (CMD) are characterized by neonatal hypotonia and/or artrogriposis associated with a dystrophic muscle biopsy. The CMD1A form is caused by a deficiency of the alpha2 chain of laminin 2 (LAMA2 gene at 6q2), a protein present in the basal lamina of muscle fibers, in Schwann cells, epidermis, and in fetal trophoblastic tissue. This allows its study for prenatal diagnosis in the chorionic villous (CV), which was performed in a family with one deceased affected CMD1A child. Immunohistochemical analysis of the CV using antibodies against the C- and N-terminal domains of the alpha2-laminin protein showed a normal positive labeling for both antibodies in the "at-risk" CV, which did not differ from the normal control CV. The integrity of the CV membrane was confirmed through the analysis with antibodies against alpha1, beta1, and gamma1 laminins. DNA study using markers flanking the 6q2 region showed that the affected patient and the "at-risk" fetus did not share the same haplotype. Therefore, the fetus was considered normal through both methodologies, which was confirmed after the birth of a clinically normal male baby. As the LAMA2 gene is very large and the spectrum of mutations causing disease is wide, the analysis of the protein in muscle biopsy has been largely used for the diagnosis. Besides, the possibility to detect it in the chorionic villous, mainly using positive markers, also offers a powerful tool for prenatal diagnosis.
Lydia U Yamamoto; Thomas R Gollop; Nadyr F Naccache; Rita C M Pavanello; Edmar Zanoteli; Mayana Zatz; Mariz Vainzof
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Diagnostic molecular pathology : the American journal of surgical pathology, part B     Volume:  13     ISSN:  1052-9551     ISO Abbreviation:  Diagn. Mol. Pathol.     Publication Date:  2004 Sep 
Date Detail:
Created Date:  2004-08-23     Completed Date:  2005-02-01     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  9204924     Medline TA:  Diagn Mol Pathol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  167-71     Citation Subset:  IM    
Department of Biology, Human Genome Research Center, São Paulo, Brazil.
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MeSH Terms
Antibodies, Monoclonal / diagnostic use
Chorionic Villi Sampling*
Laminin / analysis*,  deficiency*,  immunology
Microsatellite Repeats / genetics
Muscle, Skeletal / physiology*
Muscular Dystrophies / congenital,  diagnosis*,  genetics
Reg. No./Substance:
0/Antibodies, Monoclonal; 0/Laminin; 0/laminin alpha 2

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