A speciation gene for left-right reversal in snails results in anti-predator adaptation.
A speciation gene for left-right reversal in snails results in anti-predator adaptation.
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DOI：
10.1038/ncomms1133
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发表时间：
2010
影响因子：
16.6
通讯作者：
Hori, Michio
中科院分区：
文献类型：
--
作者：
Hoso, Masaki;Kameda, Yuichi;Wu, Shu-Ping;Asami, Takahiro;Kato, Makoto;Hori, Michio
物种形成基因是如何在种群中传播的，人们知之甚少。在陆地蜗牛中，一个左右颠倒的基因可能会导致立即的物种形成，因为右旋和左旋蜗牛很难交配。然而，传统的双基因座物种形成模型预测交配的劣势会抵消这种物种形成。在这项研究中，我们表明，专业化的蛇捕食的大多数右旋驱动猎物物种的逆转。我们的实验证明了左缘Satsuma蜗牛（stylommatophhora: Camaenidae）在被Pareas iwasakii （Colubroidea: Pareatidae）捕食后存活。世界范围内的生物地理学研究表明，在非对称蛇类的范围内，通过逆转的方式加速了stylommatophoran蜗牛的物种形成，特别是在具有较强的抗蛇防御能力和与右旋动物生殖隔离的蜗牛中。萨摩蜗牛的分子系统发育进一步提供了在蛇捕食下重复物种形成的有趣证据。我们的研究表明，物种形成基因可以通过对生存的积极多效效应在种群中固定。单个基因导致螺壳向右卷曲或向左卷曲，不同卷曲的螺不能交配。在这里，作者提供了这样一个等位基因是如何在一个群体中固定下来的证据，表明具有逆时针螺旋的蜗牛可以免受捕食者的侵害。
How speciation genes can spread in a population is poorly understood. In land snails, a single gene for left–right reversal could be responsible for instant speciation, because dextral and sinistral snails have difficulty in mating. However, the traditional two-locus speciation model predicts that a mating disadvantage for the reversal should counteract this speciation. In this study, we show that specialized snake predation of the dextral majority drives prey speciation by reversal. Our experiments demonstrate that sinistral Satsuma snails (Stylommatophora: Camaenidae) survive predation by Pareas iwasakii (Colubroidea: Pareatidae). Worldwide biogeography reveals that stylommatophoran snail speciation by reversal has been accelerated in the range of pareatid snakes, especially in snails that gain stronger anti-snake defense and reproductive isolation from dextrals by sinistrality. Molecular phylogeny of Satsuma snails further provides intriguing evidence of repetitive speciation under snake predation. Our study demonstrates that a speciation gene can be fixed in populations by positive pleiotropic effects on survival. A single gene results in either dextral or sinistral snail shell coiling and snails with different coils cannot copulate. Here, the authors provide evidence of how such an allele can become fixed in a population by showing that snails with a counterclockwise sinistral coil are protected from predators.
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影响因子：
2.9
作者：
Hoso, Masaki;Hori, Michio
通讯作者：
Hori, Michio
影响因子：
9.8
作者：
Davison, A;Chiba, S;Clarke, B
通讯作者：
Clarke, B
DOI：
10.1098/rstb.1977.0026
发表时间：
1977-01-01
影响因子：
6.3
作者：
CAIN, AJ
通讯作者：
CAIN, AJ
影响因子：
0.7
作者：
Hoso, Masaki
通讯作者：
Hoso, Masaki
影响因子：
3.8
作者：
JOHNSON, MS
通讯作者：
JOHNSON, MS