Abstract:
:Phenotypic differences between closely related species are thought to arise primarily from changes in gene expression due to mutations in cis-regulatory sequences (enhancers). However, it has remained unclear how frequently mutations alter enhancer activity or create functional enhancers de novo. Here we use STARR-seq, a recently developed quantitative enhancer assay, to determine genome-wide enhancer activity profiles for five Drosophila species in the constant trans-regulatory environment of Drosophila melanogaster S2 cells. We find that the functions of a large fraction of D. melanogaster enhancers are conserved for their orthologous sequences owing to selection and stabilizing turnover of transcription factor motifs. Moreover, hundreds of enhancers have been gained since the D. melanogaster-Drosophila yakuba split about 11 million years ago without apparent adaptive selection and can contribute to changes in gene expression in vivo. Our finding that enhancer activity is often deeply conserved and frequently gained provides functional insights into regulatory evolution.
journal_name
Nat Genetjournal_title
Nature geneticsauthors
Arnold CD,Gerlach D,Spies D,Matts JA,Sytnikova YA,Pagani M,Lau NC,Stark Adoi
10.1038/ng.3009subject
Has Abstractpub_date
2014-07-01 00:00:00pages
685-92issue
7eissn
1061-4036issn
1546-1718pii
ng.3009journal_volume
46pub_type
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