Meiotic drive adaptive testes enlargement during early development in the stalk-eyed fly.
Meiotic drive adaptive testes enlargement during early development in the stalk-eyed fly.
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DOI：
10.1098/rsbl.2022.0352
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发表时间：
2022-11
期刊：
影响因子：
3.3
通讯作者：
中科院分区：
文献类型：
--
作者：
杆眼苍蝇的性别比(SR)X连锁减数分裂驱动系统破坏Y-精子。与其他SR系统不同的是，Drive雄性不会失去生育能力。它们极大地增大了睾丸，以弥补对配子的杀死。我们预测，随着附腺资源的重新分配，随着发育的延长，增大的睾丸会出现，因为在驱动型雄性中，附腺往往更小。为了验证这一点，我们跟踪了野生种的睾丸和附腺的生长，并在雄性达到性成熟之前，在羽化后5-6周内驱使雄性。这两个原始预测都没有得到这些数据的支持。相反，我们发现驱使雄性睾丸在羽化时变大，反映出化蛹期间更多的资源分配给了睾丸。在DRIVE雄鼠的成年早期发育过程中，睾丸的生长速度更快，但没有证据表明这会阻碍附属腺的生长。建议进行进一步的实验，以调查是否只有在雄蝇交配后或当果蝇受到营养压力时，才会出现较小的附腺。我们的实验结果支持这一观点，即驱动型男性的睾丸增大是对资源的适应性分配，以增强男性生殖成功的特征。
The sex ratio (SR) X-linked meiotic drive system in stalk-eyed flies destroys Y-bearing sperm. Unlike other SR systems, drive males do not suffer fertility loss. They have greatly enlarged testes which compensate for gamete killing. We predicted that enlarged testes arise from extended development with resources re-allocated from the accessory glands, as these tend to be smaller in drive males. To test this, we tracked the growth of the testes and accessory glands of wild-type and drive males over 5–6 weeks post-eclosion before males attained sexual maturity. Neither of the original predictions is supported by these data. Instead, we found that the drive male testes were enlarged at eclosion, reflecting a greater allocation of resources to the testes during pupation. Testes grow at a higher rate during early adult development in drive males, but there was no evidence that this retards the growth of the accessory glands. Further experiments are proposed to investigate whether smaller accessory glands only arise in drive males post-copulation or when flies are subjected to nutritional stress. Our experimental findings support the idea that enlarged testes in drive males arise as an adaptive allocation of resources to traits that enhance male reproductive success.
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影响因子：
2.1
作者：
HAIG, D;BERGSTROM, CT
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