Apr 7, 2020

Signatures of mito-nuclear climate adaptation in a warbler species complex

BioRxiv : the Preprint Server for Biology
Silu WangD. E. Irwin

Abstract

Mitochondrial (mtDNA) and nuclear (nDNA) genes interact to govern metabolic pathways of mitochondria. When differentiated populations interbreed at secondary contact, incompatibilities between mtDNA of one population and nDNA of the other could result in low fitness of hybrids. Hermit Warblers (S. occidentalis abbreviated as HEWA) and inland Townsend's Warblers (Setophaga townsendi, abbreviated as i-TOWA) exhibit distinct mtDNA haplotypes and a few nDNA regions of high differentiation, whereas coastal TOWA (c-TOWA) displays a mix of these genetic patterns consistent with ancient hybridization of HEWA and i-TOWA. Of the few highly-differentiated nDNA regions between i-TOWA and HEWA, two of these regions (on chromosome 5 and Z, respectively) are also differentiated between c-TOWA and i-TOWA, similar to the mtDNA pattern. These two nDNA regions are associated with mitochondrial fatty acid metabolism. Moreover, these nDNA regions are correlated with mtDNA ancestries among sites, a pattern consistent with mito-nuclear co-adaptation. Such mito-nuclear coevolution might be driven by climate-related selection, because the mito-nuclear ancestry is correlated with climatic conditions among sampling sites. These results suggest that crypt...Continue Reading

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