title: Introgression of mitochondrial DNA among lineages in a hybridogenetic ant.
abstract: We report a remarkable pattern of incongruence between nuclear and mitochondrial variations in a social insect, the desert ant Cataglyphis hispanica. This species reproduces by social hybridogenesis. In all populations, two distinct genetic lineages coexist; non-reproductive workers develop from hybrid crosses between the lineages, whereas reproductive offspring (males and new queens) are typically produced asexually by parthenogenesis. Genetic analyses based on nuclear markers revealed that the two lineages remain highly differentiated despite constant hybridization for worker production. Here, we show that, in contrast with nuclear DNA, mitochondrial DNA (mtDNA) does not recover the two lineages as monophyletic. Rather, mitochondrial haplotypes cluster according to their geographical origin. We argue that this cytonuclear incongruence stems from introgression of mtDNA among lineages, and review the mechanisms likely to explain this pattern under social hybridogenesis.
authors: Evolutionary Biology and Ecology, Université Libre de Bruxelles, Avenue Franklin D. Roosevelt, 50, CP 160/12, Brussels 1050, Belgium hugo.darras@ulb.ac.be.
authors: Hugo
authors: H
authors: Darras
authors: Evolutionary Biology and Ecology, Université Libre de Bruxelles, Avenue Franklin D. Roosevelt, 50, CP 160/12, Brussels 1050, Belgium.
authors: Serge
authors: S
authors: Aron
mesh_terms: D000818:Animals; D001000:Ants / Q000235:genetics*; D004272:DNA, Mitochondrial / Q000235:genetics*; D005260:Female; D006239:Haplotypes; D006824:Hybridization, Genetic; D008297:Male; D008928:Mitochondria / Q000235:genetics; D010312:Parthenogenesis / Q000235:genetics*; D012098:Reproduction / Q000235:genetics
chemical_list: D004272:DNA, Mitochondrial
keywords: hybridogenesis; introgression; social insects
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