Early‐breeding females experience greater telomere loss

Early‐breeding females experience greater telomere loss
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早期繁殖的雌性会经历更大的端粒损失

DOI:
10.1111/mec.14952
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发表时间:
2019
期刊:
影响因子:
4.9
通讯作者:
Greives, Timothy J.
Greives, Timothy J.
中科院分区:
生物学1区
文献类型:
--
作者:
Graham, Jessica L.;Bauer, Carolyn M.;Heidinger, Britt J.;Ketterson, Ellen D.;Greives, Timothy J.

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每年的繁殖成功率往往是最高的个人,开始繁殖早,但相对较少的个人开始在这个显然是最佳的时间繁殖。这表明,个体,特别是最终决定后代出生时间的雌性,在季节早期开始繁殖会产生成本。我们假设,体细胞老化率的增加可能是这样一种成本。端粒,染色体末端的重复DNA序列,可能是生物磨损的良好代表,因为它们随着年龄的增长和压力的反应而缩短。使用来自黑眼容科斯(Junco hyemalis)的长期研究群体的历史数据,我们发现,无论实际年龄如何,在早期繁殖的女性中,端粒的损失都更大。端粒丢失和每年产卵或小鸡达到独立的数量之间没有关系。然而,当温度较低时,端粒的损失更大,而较低的温度通常发生在季节的早期。这表明环境条件可能是早期育种者加速端粒丢失的主要原因。
Annual reproductive success is often highest in individuals that initiate breeding early, yet relatively few individuals start breeding during this apparently optimal time. This suggests that individuals, particularly females who ultimately dictate when offspring are born, incur costs by initiating reproduction early in the season. We hypothesized that increases in the ageing rate of somatic cells may be one such cost. Telomeres, the repetitive DNA sequences on the ends of chromosomes, may be good proxies of biological wear and tear as they shorten with age and in response to stress. Using historical data from a long‐term study population of dark‐eyed juncos (Junco hyemalis), we found that telomere loss between years was greater in earlier breeding females, regardless of chronological age. There was no relationship between telomere loss and the annual number of eggs laid or chicks that reached independence. However, telomere loss was greater when temperatures were cooler, and cooler temperatures generally occur early in the season. This suggests that environmental conditions could be the primary cause of accelerated telomere loss in early breeders.
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期刊: ECOLOGY
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