Adaptive evolution of pelvic reduction in sticklebacks by recurrent deletion of a Pitx1 enhancer.
Adaptive evolution of pelvic reduction in sticklebacks by recurrent deletion of a Pitx1 enhancer.
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DOI:
10.1126/science.1182213
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发表时间:
2010-01-15
期刊:
影响因子:
--
通讯作者:
Kingsley DM
中科院分区:
文献类型:
--
作者:
Chan YF;Marks ME;Jones FC;Villarreal G Jr;Shapiro MD;Brady SD;Southwick AM;Absher DM;Grimwood J;Schmutz J;Myers RM;Petrov D;Jónsson B;Schluter D;Bell MA;Kingsley DM
The molecular mechanisms underlying major phenotypic changes that have evolved repeatedly in nature are generally unknown. Pelvic loss in different natural populations of threespine stickleback fish has occurred by regulatory mutations deleting a tissue-specific enhancer of the Pituitary homeobox transcription factor 1 (Pitx1) gene. The high prevalence of deletion mutations at Pitx1 may be influenced by inherent structural features of the locus. Although Pitx1 null mutations are lethal in laboratory animals, Pitx1 regulatory mutations show molecular signatures of positive selection in pelvic-reduced populations. These studies illustrate how major expression and morphological changes can arise by single mutational leaps in natural populations, producing new adaptive alleles via recurrent regulatory alterations in a key developmental control gene.
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