中性突变SNP的年龄评估(estimate the average age of a neutral two-allele polymorphism)
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假设中性突变的频率分别为P和1-P,则其突变年龄为:-4Ne[p*( logep)+(1-p)* loge (1-p)]
The average age of a neutral two-allele polymorphism with frequencies p and is 1-p:-4Ne[p*( logep)+(1-p)* loge (1-p)];
这里,Ne为有效群体大小,假定一个群体的有效群体大小是5000,某个SNP突变频率分别为0.1和0.9,则其突变年龄为:
-4*5000*(0.1*log(0.1)+0.9*log(0.9))= 6501.659
这里的6501单位为generation,一个generation是25年。所以突变年龄是:6501.659*25
公式出处:
1、The age of a neutral mutant persisting in a finite population. Genetics 75:199–212
2、Dating the Origin of the CCR5-D32 AIDS-Resistance Allele by the Coalescence of Haplotypes
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