Artículos de revistas
R2d2 drives selfish sweeps in the house mouse
Fecha
2016-06Registro en:
Didion, John P.; Morgan, Andrew P.; Yadgary, Liran; Bell, Timothy A.; McMullan, Rachel C.; et al.; R2d2 drives selfish sweeps in the house mouse; Oxford University Press; Molecular Biology and Evolution; 33; 6; 6-2016; 1381-1395
0737-4038
1537-1719
CONICET Digital
CONICET
Autor
Didion, John P.
Morgan, Andrew P.
Yadgary, Liran
Bell, Timothy A.
McMullan, Rachel C.
Ortiz de Solorzano, Lydia
Britton-Davidian, Janice
Bult, Carol J.
Campbell, Karl J.
Castiglia, Riccardo
Ching, Yung-Hao
Chunco, Amanda J.
Crowley, James J.
Chesler, Elissa J.
Förster, Daniel W.
French, John E.
Gabriel, Sofia I.
Gatti, Daniel M.
Garland, Theodore Jr
Giagia Athanasopoulou, Eva B.
Giménez, Mabel Dionisia
Grize, Sofia A.
Gündüz, Islam
Holmes, Andrew
Hauffe, Heidi C.
Herman, Jeremy S.
Holt, James M.
Kunjie, Hua
Jolley, Wesley J.
Pardo Manuel de Villena, Fernando
Resumen
A selective sweep is the result of strong positive selection driving newly occurring or standing genetic variants to fixation, and can dramatically alter the pattern and distribution of allelic diversity in a population. Population-level sequencing data have enabled discoveries of selective sweeps associated with genes involved in recent adaptations in many species. In contrast, much debate but little evidence addresses whether “selfish” genes are capable of fixation—thereby leaving signatures identical to classical selective sweeps—despite being neutral or deleterious to organismal fitness. We previously described R2d2, a large copy-number variant that causes nonrandom segregation of mouse Chromosome 2 in females due to meiotic drive. Here we show population-genetic data consistent with a selfish sweep driven by alleles of R2d2 with high copy number (R2d2HC) in natural populations. We replicate this finding in multiple closed breeding populations from six outbred backgrounds segregating for R2d2 alleles. We find that R2d2HC rapidly increases in frequency, and in most cases becomes fixed in significantly fewer generations than can be explained by genetic drift. R2d2HC is also associated with significantly reduced litter sizes in heterozygous mothers, making it a true selfish allele. Our data provide direct evidence of populations actively undergoing selfish sweeps, and demonstrate that meiotic drive can rapidly alter the genomic landscape in favor of mutations with neutral or even negative effects on overall Darwinian fitness. Further study will reveal the incidence of selfish sweeps, and will elucidate the relative contributions of selfish genes, adaptation and genetic drift to evolution.