RT Journal Article
SR Electronic
T1 The Evolutionary Rate of Duplicated Genes Under Concerted Evolution
JF Genetics
JO Genetics
FD Genetics Society of America
SP 493
OP 505
DO 10.1534/genetics.108.087676
VO 180
IS 1
A1 Mano, Shuhei
A1 Innan, Hideki
YR 2008
UL http://www.genetics.org/content/180/1/493.abstract
AB The effect of directional selection on the fixation process of a single mutation that spreads in a multigene family by gene conversion is investigated. A simple two-locus model with two alleles, A and a, is first considered in a random-mating diploid population with size N. There are four haplotypes, AA, Aa, aA, and aa, and selection works on the number of alleles A in a diplod (i = 0, 1, 2, 3, 4). Because gene conversion is allowed between the two loci, when the mutation rate is very low, either AA or aa will fix in the population eventually. We consider a situation where a single mutant, A, arises in one locus when a is fixed in both loci. Then, we derive the fixation probability analytically, and the fixation time is investigated by simulations. It is found that gene conversion has an effect to increase the “effective” population size, so that weak selection works more efficiently in a multigene family. With these results, we discuss the effect of gene conversion on the rate of molecular evolution in a multigene family undergoing concerted evolution. We also argue about the applicability of the theoretical results to models of multigene families with more than two loci.