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First published on May 14, 2008, doi:10.1177/1933719107314061
This version was published on May
15, 2008
Association Between Novel HLA-G Genotypes and Risk of Recurrent Miscarriages: A Case-Control Study in a South Indian Population
Venkata Suryanarayana, MSc,
Lakshmi Rao, MSc,
Murthy Kanakavalli, MSc,
Venkata Padmalatha, MSc,
Mamata Deenadayal, MD,
and
Lalji Singh, DSc*
* To whom correspondence should be addressed. E-mail: lakshmi{at}ccmb.res.in.
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Abstract |
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HLA-G is a nonclassical histocompatibility complex member associated with fetal tolerance of the mother observed during pregnancy. Despite its being a less polymorphic gene, a number of studies have evaluated the role of HLA-G gene polymorphisms on the risk of pregnancy-related complications. A 14-bp deletion polymorphism in exon 8 (3'UTR) was known to influence the levels of soluble HLA-G, differential splicing of the transcript, and also the induction of interleukin-10 secretion. The present study is aimed at evaluating the variations in exon 2 and exon 8 of the HLA-G gene for the risk of recurrent miscarriages in South Indian women. A total of 169 cases and 92 controls are included in the study. Six novel polymorphisms were identified, 2 of which are in intron 2 near the exon-intron junction and 4 of which are present downstream to the 14-bp deletion in 3'UTR. The exon 2 and intron polymorphisms failed to show any association. The T1570C and C1594A polymorphisms showed a significant association (P = .002 and .021) with the risk of miscarriage after categorization based on the 14-bp deletion. Linkage disequilibrium analysis showed that the T allele of T1570C is in linkage disequilibrium with the 14-bp deletion in cases but not in controls. In silico RNA folding studies indicate that the T allele forms a more stable secondary structure than the C allele, giving rise to a more stable transcript. The authors demonstrate a significant relation between the two 3'UTR polymorphisms and recurrent miscarriages.

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