RT Journal Article
SR Electronic
T1 Genome-wide patterns of regulatory divergence revealed by introgression lines
JF bioRxiv
FD Cold Spring Harbor Laboratory
SP 037333
DO 10.1101/037333
A1 Rafael F. Guerrero
A1 Amanda L. Posto
A1 Leonie C. Moyle
A1 Matthew W. Hahn
YR 2016
UL http://biorxiv.org/content/early/2016/01/19/037333.abstract
AB Understanding the genetic basis for changes in transcriptional regulation is an important aspect of understanding phenotypic evolution. Using interspecific introgression lines, we infer the mechanisms of divergence in genome-wide patterns of gene expression between the nightshades Solanum pennellii and S. lycopersicum (domesticated tomato). We find that cis- and frans-regulatory changes have had qualitatively similar contributions to divergence in this clade, unlike results from other systems. Additionally, expression data from four tissues (shoot apex, ripe fruit, pollen, and seed) suggest that introgressed regions in these hybrid lines tend to be down-regulated, while background (non-introgressed) genes tend to be up-regulated. Finally, we find no evidence for an association between the magnitude of differential expression in NILs and previously determined sterility phenotypes. Our results contradict previous predictions of the predominant role of cis- over frans-regulatory divergence between species, and do not support a major role for gross genome-wide misregulation in reproductive isolation between these species.