Unequal rates of Y chromosome gene divergence during speciation of the family Ursidae

Molecular Biology and Evolution
Shigeki NakagomeRyuichi Masuda

Abstract

Evolution of the bear family Ursidae is well investigated in terms of morphological, paleontological, and genetic features. However, several phylogenetic ambiguities occur within the subfamily Ursinae (the family Ursidae excluding the giant panda and spectacled bear), which may correlate with behavioral traits of female philopatry and male-biased dispersal which form the basis of the observed matriarchal population structure in these species. In the process of bear evolution, we investigate the premise that such behavioral traits may be reflected in patterns of variation among genes with different modes of inheritance: matrilineal mitochondrial DNA (mtDNA), patrilineal Y chromosome, biparentally inherited autosomes, and the X chromosome. In the present study, we sequenced 3 Y-linked genes (3,453 bp) and 4 X-linked genes (4,960 bp) and reanalyzed previously published sequences from autosome genes (2,347 bp) in ursid species to investigate differences in evolutionary rates associated with patterns of inheritance. The results describe topological incongruence between sex-linked genes and autosome genes and between nuclear DNA and mtDNA. In more ancestral branches within the bear phylogeny, Y-linked genes evolved faster than autoso...Continue Reading

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Sep 29, 2011·BMC Evolutionary Biology·Trinidad PérezAna Domínguez
Aug 23, 2012·BMC Evolutionary Biology·Yi-Chiao ChanLinda Vigilant
Oct 13, 2009·Yi chuan = Hereditas·Peng-Tao LuanYa-Ping Zhang
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May 29, 2015·Genome Biology and Evolution·Tobias BidonAxel Janke
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