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Blood, 15 June 2006, Vol. 107, No. 12, pp. 4666-4668. Prepublished online as a Blood First Edition Paper on February 21, 2006; DOI 10.1182/blood-2005-12-5158.
Submitted January 3, 2006
The Amalia Biron Research Institute of Thrombosis and Hemostasis, Sheba Medical Center and Tel Aviv University, Tel Hashomer, Israel * Corresponding author; email: seligson{at}sheba.health.gov.il.
Prothrombin G20210A and factor V Leiden are common prothrombotic mutations in Caucasians for which founder effects have been established. In this study, we analysed the frequencies of 5 single nucleotide polymorphisms (SNPs) and 9 microsatellites flanking the prothrombin gene in 88 homozygotes for 20210A and 66 homozygotes for 20210G. For estimating the age of the prothrombin G20210A mutation we used the DMLE+2.0 program which analysed linkage disequilibria between the mutation and the multiple markers that had been assessed. This analysis yielded an age estimate of 23,720 years (95% credible set 19,080-31,340). A similar analysis by the DMLE+2.0 program was performed on 5 SNPs from previously studied homozygotes for factor V Leiden and controls which yielded an age estimate of 21,340 years (95% credible set 16,880-29,480). The occurrence of the two mutations in Caucasians towards the end of the last glaciation and their presently wide distribution in Caucasians suggest selective evolutionary advantages for which some evidence was reported (diminished blood loss), or is controversial (protection against infections).
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