Open AccessMito‐nuclear discordance with evidence of shared ancestral polymorphism and selection in cactophilic species of Drosophila
Author(s) -
Franco Fernando F.,
Lavagnini Taís C.,
Sene Fabio M.,
Manfrin Maura H.
Publication year - 2015
Publication title -
biological journal of the linnean society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.906
H-Index - 112
eISSN - 1095-8312
pISSN - 0024-4066
DOI - 10.1111/bij.12554
Subject(s) - biology , monophyly , haplogroup , cytochrome c oxidase subunit i , evolutionary biology , natural selection , negative selection , genetics , introgression , mitochondrial dna , gene , phylogenetics , selection (genetic algorithm) , genome , clade , haplotype , genotype , artificial intelligence , computer science
The Drosophila serido haplogroup is a monophyletic group composed of the following four cryptic and cactophilic species that are endemic to eastern Brazil: D. borborema , D. gouveai , D. seriema and D. serido . Here, we investigate the mito‐nuclear discordance in these species found among the cytochrome c oxidase subunit I (COI) mitochondrial gene, the autosomal alpha‐Esterase‐5 ( α‐Est5 ) and the X‐linked period gene ( per ). Our analysis indicates that shared polymorphisms in these three molecular markers may be explained by the maintenance of ancestral polymorphisms rather than introgressive hybridization. The primary structures of COI, per and α‐Est5 genes evolve primarily under purifying selection, but we detected some sites that evolved under positive selection in α‐Est5 . Considering the high variability of cacti species in eastern Brazil and the role attributed to Drosophila esterases in digestion metabolism and/or the detoxification of several compounds found in cactus tissues, we conjecture about the role of natural selection triggered by host shifts as an important factor in the intraspecific diversification of the D. serido haplogroup.