Inter-chromosomal coupling between vision and pigmentation genes during genomic divergence.

Hench, Kosmas , Vargas, Marta, Höppner, Marc P., McMillan, W. Owen and Puebla, Oscar (2019) Inter-chromosomal coupling between vision and pigmentation genes during genomic divergence. Open Access Nature Ecology & Evolution, 3 (4). pp. 657-667. DOI 10.1038/s41559-019-0814-5.

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Abstract

Recombination between loci underlying mate choice and ecological traits is a major evolutionary force acting against speciation with gene flow. The evolution of linkage disequilibrium between such loci is therefore a fundamental step in the origin of species. Here, we show that this process can take place in the absence of physical linkage in hamlets—a group of closely related reef fishes from the wider Caribbean that differ essentially in colour pattern and are reproductively isolated through strong visually-based assortative mating. Using full-genome analysis, we identify four narrow genomic intervals that are consistently differentiated among sympatric species in a backdrop of extremely low genomic divergence. These four intervals include genes involved in pigmentation (sox10), axial patterning (hoxc13a), photoreceptor development (casz1) and visual sensitivity (SWS and LWS opsins) that develop islands of long-distance and inter-chromosomal linkage disequilibrium as species diverge. The relatively simple genomic architecture of species differences facilitates the evolution of linkage disequilibrium in the presence of gene flow.

Document Type: Article
Research affiliation: OceanRep > GEOMAR > FB3 Marine Ecology > FB3-EV Marine Evolutionary Ecology
Refereed: Yes
Open Access Journal?: No
DOI etc.: 10.1038/s41559-019-0814-5
ISSN: 2397-334X
Related URLs:
Date Deposited: 26 Mar 2019 13:24
Last Modified: 28 May 2019 07:29
URI: http://oceanrep.geomar.de/id/eprint/46219

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