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Systematic Detection of Polygenic Regulatory
Evolution


The idea that most morphological adaptations can be attributed to changes in the

cis-regulation of gene expression levels has been gaining

increasing acceptance, despite the fact that only a handful of such cases have

so far been demonstrated. Moreover, because each of these cases involves only

one gene, we lack any understanding of how natural selection may act on

cis-regulation across entire pathways or networks. Here we

apply a genome-wide test for selection on cis-regulation to two

subspecies of the mouse Mus musculus. We find evidence for

lineage-specific selection at over 100 genes involved in diverse processes such

as growth, locomotion, and memory. These gene sets implicate candidate genes

that are supported by both quantitative trait loci and a validated

causality-testing framework, and they predict a number of phenotypic

differences, which we confirm in all four cases tested. Our results suggest that

gene expression adaptation is widespread and that these adaptations can be

highly polygenic, involving cis-regulatory changes at numerous

functionally related genes. These coordinated adaptations may contribute to

divergence in a wide range of morphological, physiological, and behavioral

phenotypes.


Vyšlo v časopise: Systematic Detection of Polygenic Regulatory Evolution. PLoS Genet 7(3): e32767. doi:10.1371/journal.pgen.1002023
Kategorie: Research Article
prolekare.web.journal.doi_sk: https://doi.org/10.1371/journal.pgen.1002023

Souhrn

The idea that most morphological adaptations can be attributed to changes in the

cis-regulation of gene expression levels has been gaining

increasing acceptance, despite the fact that only a handful of such cases have

so far been demonstrated. Moreover, because each of these cases involves only

one gene, we lack any understanding of how natural selection may act on

cis-regulation across entire pathways or networks. Here we

apply a genome-wide test for selection on cis-regulation to two

subspecies of the mouse Mus musculus. We find evidence for

lineage-specific selection at over 100 genes involved in diverse processes such

as growth, locomotion, and memory. These gene sets implicate candidate genes

that are supported by both quantitative trait loci and a validated

causality-testing framework, and they predict a number of phenotypic

differences, which we confirm in all four cases tested. Our results suggest that

gene expression adaptation is widespread and that these adaptations can be

highly polygenic, involving cis-regulatory changes at numerous

functionally related genes. These coordinated adaptations may contribute to

divergence in a wide range of morphological, physiological, and behavioral

phenotypes.


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Štítky
Genetika Reprodukčná medicína

Článok vyšiel v časopise

PLOS Genetics


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