CR1 retroposons provide a new insight into the phylogeny of Phasianidae species (Aves: Galliformes)

Gene
Zhaofeng LiuJing Li

Abstract

Chicken repeat 1 (CR1) elements, a class of retroposons belonging to non-long-terminal repeats, have been recognized as powerful tools for phylogenetic studies. Here we examine the phylogenetic relationships of 11 Phasianidae species based on CR1 retroposons. Together with 19 loci reported previously, a total of 99 CR1 loci were identified from chicken genome and turkey BAC clone sequences. 75 insertion events were used to address the branching order of 11 species in Phasianidae. The topology of our tree suggests that: 1) Gallus gallus possessed a basal phylogenetic position within Phasianidae and was related to Bambusicola thoracica (BSP=100%); 2) After the split of G. gallus and B. thoracica, Arborophila rufipectus diverged from Phasianidae (BSP=100%). Nine unambiguous insertion events supported a phylogenetic position of A. rufipectus different to previous mitochondrial data suggesting a hybrid origin or an ancient introgression of A. rufipectus; and 3) 22 CR1 insertion events strongly supported the eight phasianids under investigation sharing a common ancestor. Our study has revisited the phylogenetic position of G. gallus and A. rufipectus and provided a new insight into the phylogeny of Phasianidae birds. It showed that a...Continue Reading

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