Genetics of alternative splicing evolution during sunflower domestication.

Autor:	Smith CCR; Department of Ecology and Evolutionary Biology, University of Colorado Boulder, Boulder, CO 80309-0334; chriscs@colorado.edu., Tittes S; Department of Ecology and Evolutionary Biology, University of Colorado Boulder, Boulder, CO 80309-0334., Mendieta JP; Department of Ecology and Evolutionary Biology, University of Colorado Boulder, Boulder, CO 80309-0334., Collier-Zans E; Department of Ecology and Evolutionary Biology, University of Colorado Boulder, Boulder, CO 80309-0334., Rowe HC; Department of Botany, University of British Columbia, Vancouver, BC V6T 1Z4, Canada.; Institute for Genomics and Evolutionary Medicine, Temple University, Philadelphia, PA 19122-1801., Rieseberg LH; Department of Botany, University of British Columbia, Vancouver, BC V6T 1Z4, Canada., Kane NC; Department of Ecology and Evolutionary Biology, University of Colorado Boulder, Boulder, CO 80309-0334.
Jazyk:	angličtina
Zdroj:	Proceedings of the National Academy of Sciences of the United States of America [Proc Natl Acad Sci U S A] 2018 Jun 26; Vol. 115 (26), pp. 6768-6773. Date of Electronic Publication: 2018 Jun 11.
DOI:	10.1073/pnas.1803361115
Abstrakt:	Alternative splicing enables organisms to produce the diversity of proteins necessary for multicellular life by using relatively few protein-coding genes. Although differences in splicing have been identified among divergent taxa, the shorter-term evolution of splicing is understudied. The origins of novel splice forms, and the contributions of alternative splicing to major evolutionary transitions, are largely unknown. This study used transcriptomes of wild and domesticated sunflowers to examine splice differentiation and regulation during domestication. We identified substantial splicing divergence between wild and domesticated sunflowers, mainly in the form of intron retention. Transcripts with divergent splicing were enriched for seed-development functions, suggesting that artificial selection impacted splicing patterns. Mapping of quantitative trait loci (QTLs) associated with 144 differential splicing cases revealed primarily trans -acting variation affecting splicing patterns. A large proportion of identified QTLs contain known spliceosome proteins and are associated with splicing variation in multiple genes. Examining a broader set of wild and domesticated sunflower genotypes revealed that most differential splicing patterns in domesticated sunflowers likely arose from standing variation in wild Helianthus annuus and gained frequency during the domestication process. However, several domesticate-associated splicing patterns appear to be introgressed from other Helianthus species. These results suggest that sunflower domestication involved selection on pleiotropic regulatory alleles. More generally, our findings indicate that substantial differences in isoform abundances arose rapidly during a recent evolutionary transition and appear to contribute to adaptation and population divergence. Competing Interests: The authors declare no conflict of interest.
Databáze:	MEDLINE
Externí odkaz:	Zobrazit plný text záznamu