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Tracing the Origin of the Most Common Thiopurine Methyltransferase (TPMT) Variants: Preliminary Data from the Patterns of Haplotypic Association with Two CA Repeats

Tracing the Origin of the Most Common Thiopurine Methyltransferase (TPMT) Variants: Preliminary... Thiopurine methyltransferase (TPMT) is an essential enzyme for normal metabolism of thiopurine drugs. In humans TPMT activity is largely dependent upon genetic variation at the TPMT locus, with TPMT*3A and TPMT*3C being the most frequent mutant alleles associated with reduced activity. TPMT*3C is a widespread allele reaching the highest frequencies in Africans, whereas TPMT*3A is virtually restricted to Caucasian descendent populations. To estimate the time of origin of these two alleles, we analyzed the levels of diversity at two CA repeats flanking the TPMT gene. In accordance to its pattern of geographical distribution, the study of the decay in linkage disequilibrium over time indicated that TPMT*3A was the younger allele. The estimated age was 5700 years, which coincides with the Neolithic, a period characterized by major population expansion that could have been responsible for the spread of TPMT*3A from its place of origin, maybe a western Eurasian population. TPMT*3C was found to have arisen earlier, roughly 14000 years ago, which could explain the worldwide dispersal of TPMT*3C. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Annals of Human Genetics Wiley

Tracing the Origin of the Most Common Thiopurine Methyltransferase (TPMT) Variants: Preliminary Data from the Patterns of Haplotypic Association with Two CA Repeats

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References (36)

Publisher
Wiley
Copyright
Copyright © 2004 Wiley Subscription Services
ISSN
0003-4800
eISSN
1469-1809
DOI
10.1046/j.1529-8817.2004.00104.x
pmid
15225157
Publisher site
See Article on Publisher Site

Abstract

Thiopurine methyltransferase (TPMT) is an essential enzyme for normal metabolism of thiopurine drugs. In humans TPMT activity is largely dependent upon genetic variation at the TPMT locus, with TPMT*3A and TPMT*3C being the most frequent mutant alleles associated with reduced activity. TPMT*3C is a widespread allele reaching the highest frequencies in Africans, whereas TPMT*3A is virtually restricted to Caucasian descendent populations. To estimate the time of origin of these two alleles, we analyzed the levels of diversity at two CA repeats flanking the TPMT gene. In accordance to its pattern of geographical distribution, the study of the decay in linkage disequilibrium over time indicated that TPMT*3A was the younger allele. The estimated age was 5700 years, which coincides with the Neolithic, a period characterized by major population expansion that could have been responsible for the spread of TPMT*3A from its place of origin, maybe a western Eurasian population. TPMT*3C was found to have arisen earlier, roughly 14000 years ago, which could explain the worldwide dispersal of TPMT*3C.

Journal

Annals of Human GeneticsWiley

Published: Jan 1, 2004

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