Haplotype variation in the ACE gene in global populations, with special reference to India, and an alternative model of evolution of haplotypesReport as inadecuate




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The HUGO Journal

, Volume 5, Issue 1–4, pp 35–45

First Online: 16 April 2011Received: 14 August 2010Revised: 26 February 2011Accepted: 22 March 2011DOI: 10.1007-s11568-011-9153-6

Cite this article as: Farheen, S., Basu, A. & Majumder, P.P. HUGO J 2011 5: 35. doi:10.1007-s11568-011-9153-6

Abstract

Angiotensin-I-converting enzyme ACE is known to be associated with human cardiovascular and psychiatric pathophysiology. We have undertaken a global survey of the haplotypes in ACE gene to study diversity and to draw inferences on the nature of selective forces that may be operating on this gene. We have investigated the haplotype profiles reconstructed using polymorphisms in the regulatory rs4277405, rs4459609, rs1800764, rs4292, rs4291, exonic rs4309, rs4331, rs4343, and intronic rs4340; Alu I-D regions covering 17.8 kb of the ACE gene. We genotyped these polymorphisms in a large number of individuals drawn from 15 Indian ethnic groups and estimated haplotype frequencies. We compared the Indian data with available data from other global populations. Globally, five major haplotypes were observed. High-frequency haplotypes comprising mismatching alleles at the loci considered were seen in all populations. The three most frequent haplotypes among Africans were distinct from the major haplotypes of other world populations. We have studied the evolution of the two major haplotypes TATATTGIA and CCCTCCADG, one of which contains an Alu insertion I and the other a deletion D, seen most frequently among Caucasians 68%, non-African HapMap populations 65–88%, and Indian populations 70–95% in detail. The two major haplotypes among Caucasians are reported to represent two distinct clades A and B. Earlier studies have postulated that a third clade C represented by the haplotypes TACATCADG and TACATCADA arose from an ancestral recombination event between A and B. We find that a more parsimonious explanation is that clades A and B have arisen by recombination between haplotypes belonging to clade C and a high-frequency African haplotype CCCTTCGIA. The haplotypes, which according to our hypothesis are the putative non-recombinants PuNR, are uncommon in all non-African populations frequency range 0–12%. Conversely, the frequencies of the putative recombinant haplotypes PuR are very low in the Africans populations 2–8%, indicating that the recombination event is likely to be ancient and arose before, perhaps shortly prior to, the global dispersal of modern humans. The global frequency spectrum of the PuR and the PuNR is difficult to explain only by drift. It appears likely that the ACE gene has been undergoing a combination of different selective pressures.

KeywordsHaplotype diversity Recombinant Non-recombinant Selection Electronic supplementary materialThe online version of this article doi:10.1007-s11568-011-9153-6 contains supplementary material, which is available to authorized users.

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Author: Shabana Farheen - Analabha Basu - Partha P. Majumder

Source: https://link.springer.com/



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