Patterns of selection at the phytochrome A locus in European aspen (Populus tremula)
(English)Manuscript (preprint) (Other (popular science, discussion, etc.))
When a phenotype with a higher fitness arises in the population the underlying alleles are swept through the population until they reach fixation. The area surrounding the locus of the beneficial allele hitchhikes with the allele under selection, and the size of the area affected depends on the strength of selection. In Populus tremula a < 20kb region on linkage group 13 shows great reduction in synonymous diversity and an increase in rare and derived alleles as indicated by low negative values of Tajima's D and Fay and Wu's H. There is also an increase in associations between allleles at SNP sites in this region. We find that the sweep peaks in exon 2 of the phytochrome A gene. PHYA has not only undergone rapid protein evolution, it also show higher divergence in P. tremula than other plants examined, where it is unusually conserved, further pointing to adaptive significance of the increased rate of protein evolution seen in P. tremula.
selective sweep, hitch-hiking, natural selection, nuclotide diversity, populus
Research subject Genetics
IdentifiersURN: urn:nbn:se:umu:diva-30357OAI: oai:DiVA.org:umu-30357DiVA: diva2:281821