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Sawamura, K. et al.

Kyoichi Sawamura, Kae Koganebuchi, Hajime Sato, Koichi Kamiya, Muneo Matsuda, Yuzuru Oguma,

Potential gene flow in natural populations of the Drosophila ananassae species cluster inferred from a nuclear mitochondrial pseudogene.

A pseudogene with 94% similarity to mitochondrial cytochrome c oxidase subunit I (COI) was identified and localized to chromosome 4 of Drosophila ananassae. Because this chromosome is believed to have reduced recombination, its history can be traced using the pseudo-COI sequence. Pseudo-COI sequences were obtained from 27 iso-female lines of six taxa belonging to the D. ananassae species cluster in which reproductive isolation is incomplete. The phylogenetic network constructed from seven recognized haplotypes (#0-#6) indicated that different taxa inhabiting the same geographic area share the haplotypes: #1 from Papua New Guinean populations of D. ananassae and pallidosa-like-Wau; #2 from Papua New Guinean populations of D. ananassae, pallidosa-like, and papuensis-like; and #4 from South Pacific populations of D. ananassae and D. pallidosa. Taxon-K has a unique haplotype (#6), and 18 mutation steps separate it from the closest haplotype, #2. We discuss the possibility of chromosome 4 introgression beyond taxon boundaries.[1]

References

Potential gene flow in natural populations of the Drosophila ananassae species cluster inferred from a nuclear mitochondrial pseudogene. Sawamura, K., Koganebuchi, K., Sato, H., Kamiya, K., Matsuda, M., Oguma, Y. Mol. Phylogenet. Evol. (2008) [Pubmed]

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