The Amount of Genetic Variation at the DNA Level Maintained in a Finite Population(Differentiation Patterns of Plant Populations-Modern Approaches and Recent Progress)(INTERNATIONAL SYMPOSIUM : Differentiation Patterns of Plant Populations and Adaptive Me
スポンサーリンク
概要
- 論文の詳細を見る
The amount of DNA polymorphism can be estimated either from the average number of pairwise nucleotide differences per site (π) or from the proportion of segregating (polymorphic) site (s) among a sample of DNA sequences. Under a number of assumptions, including panmictic population and neutrality, it is known that the expectations of π and s are given by E (π) = θ and E (s) = a_1 (n) θ, where θ = 4Nv, a_1 (n) = 1+1/2+...+1/(n - 1), N is the effective population size, v is the mutation rate per site per generation, and n is the sample size. Therefore, θ can be estimated by π or s/a_1 (n). These assumptions, however, are not always correct. In this paper, using a simple non-random sampling model, I have examined the effect of non-random sampling on the estimates of the amount of DNA polymorphism. The results indicate that the effect of non-random sampling on the proportion of segregating site is substantially large whereas the effect of non-random sampling on the average number of nucleotide differences per site is negligibly small unless non-randomness is extremely large. Using a finite site model with and without rate variation, I have also examined the effect of rate variation among sites on the estimates of the amount of DNA polymorphism. The results indicate that if the neutral mutation rate varies among sites substantially, the estimates of θ based on the infinite site model are substantially underestimated. New methods for estimating θ are also presented.
- 種生物学会の論文
著者
-
Tajima F
Univ. Tokyo Tokyo Jpn
-
Tajima Fumio
Department Of Biological Sciences Graduate School Of Science The University Of Tokyo
関連論文
- Effect of population structure on the amount of polymorphism and the fixation probability under overdominant selection
- 自家不和合性遺伝子座における対立遺伝子の有効数,ヘテロザイゴシティの期待値および遺伝的距離を推定するための統計的方法〔英文〕
- Simple method for analyzing the pattern of DNA polymorphism and its application to SNP data of human
- The Amount of Genetic Variation at the DNA Level Maintained in a Finite Population(Differentiation Patterns of Plant Populations-Modern Approaches and Recent Progress)(INTERNATIONAL SYMPOSIUM : Differentiation Patterns of Plant Populations and Adaptive Me
- Effect of dominance on heterozygosity and the fixation probability in a subdivided population
- DNA多型の統計分析〔英文〕 (中立説25周年記念特集記事-2-)
- Wide-spread polymorphism of a tandem duplication in the region of the glycerol-3-phosphate dehydrogenase gene in Drosophila melanogaster.