Strength of selection on the Trpc2 gene predicts accessory olfactory bulb form in bat vomeronasal evolution
Strength of selection on the Trpc2 gene predicts accessory olfactory bulb form in bat vomeronasal evolution
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Trpc2基因的选择强度预测蝙蝠犁鼻进化中的副嗅球形状
DOI:
10.1093/biolinnean/bly015
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发表时间:
2018
影响因子:
1.9
通讯作者:
Dávalos, Liliana M
中科院分区:
文献类型:
--
作者:
Yohe, Laurel R;Dávalos, Liliana M
Vestigial characters are common across the tree of life, but the underlying evolutionary processes shaping phenotypic loss are poorly understood. The mammalian vomeronasal system, which detects social chemical cues important to fitness, is an impressive example of a sensory system lost multiple times. Three times more losses are inferred among bats than in other mammalian orders. We characterized the relationship between amino acid substitutions in a gene tightly linked to vomeronasal function (Trpc2) and the accessory olfactory bulb, a brain region that processes the detection of these vomeronasal chemical cues. By applying a phylogenetic logistic regression, we found a strong negative relationship between the branch lengths representing rates of codon changes in theTrpc2gene tree and the presence or absence of an accessory olfactory bulb. Longer branch lengths predict loss of the accessory olfactory bulb, suggesting selection has relaxed on the system as a whole. Based on this relationship, we predicted the absence of an accessory olfactory bulb in 19 bat species with unknown morphology. Several species with predicted losses have specialized skull morphology, suggesting a potential tradeoff between adaptation in skull shape and maintenance of the vomeronasal system. This study offers a new approach to relate genetic mechanisms and phenotypes at a macroevolutionary scale.
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