Variation in heterozygosity predicts variation in human substitution rates between populations, individuals and genomic regions.

Abstract excerpt

The "heterozygote instability" (HI) hypothesis suggests that gene conversion events focused on heterozygous sites during meiosis locally increase the mutation rate, but this hypothesis remains largely untested. As humans left Africa they lost variability, which, if HI operates, should have reduced the mutation rate in non-Africans. Relative substitution rates were quantified in diverse humans using aligned whole...

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