Functional divergence of duplicate genes several million years after gene duplication in Arabidopsis

DNA Research : an International Journal for Rapid Publication of Reports on Genes and Genomes
Kousuke HanadaShin-Ichi Morinaga

Abstract

Lineage-specific duplicated genes likely contribute to the phenotypic divergence in closely related species. However, neither the frequency of duplication events nor the degree of selection pressures immediately after gene duplication is clear in the speciation process. Here, using Illumina DNA-sequencing reads from Arabidopsis halleri, which has multiple closely related species with high-quality genome assemblies (A. thaliana and A. lyrata), we succeeded in generating orthologous gene groups in Brassicaceae. The duplication frequency of retained genes in the Arabidopsis lineage was ∼10 times higher than the duplication frequency inferred by comparative genomics of Arabidopsis, poplar, rice and moss (Physcomitrella patens). The difference of duplication frequencies can be explained by a rapid decay of anciently duplicated genes. To examine the degree of selection pressure on genes duplicated in either the A. halleri-lyrata or the A. halleri lineage, we examined positive and purifying selection in the A. halleri-lyrata and A. halleri lineages throughout the ratios of nonsynonymous to synonymous substitution rates (KA/KS). Duplicate genes tended to have a higher proportion of positive selection compared with non-duplicated genes....Continue Reading

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Citations

May 12, 2019·Molecular Genetics and Genomics : MGG·Hui SongGuofeng Yang
Dec 9, 2020·Molecular Biology and Evolution·Akihiro EzoeKousuke Hanada
Feb 20, 2021·Journal of Mathematical Biology·David SchallerMarc Hellmuth

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