Sexual partners for the stressed: facultative outcrossing in the self-fertilizing nematode Caenorhabditis elegans.
Sexual partners for the stressed: facultative outcrossing in the self-fertilizing nematode Caenorhabditis elegans.
复制标题
压力的性伴侣：使用线虫秀丽隐杆线虫的自我育种中的兼性脱落。
DOI：
10.1111/j.1558-5646.2009.00652.x
复制
发表时间：
2009-06
期刊：
影响因子：
--
通讯作者：
Phillips PC
中科院分区：
文献类型：
--
作者：
Morran LT;Cappy BJ;Anderson JL;Phillips PC
有性生殖打乱了遗传变异，潜在地增强了对环境变化的进化反应。许多无性生物利用兼性有性生殖作为一种手段，以逃避低遗传多样性的陷阱下的压力。自我繁殖的生物体也受到类似的遗传限制：谱系内遗传多样性的持续丧失限制了通过重组产生变异。因此，在压力时期，自交生物可能会从交配策略的类似转变中受益。我们确定了环境压力的影响，通过饥饿和暴露的抗应激dauer阶段的秀丽隐杆线虫，主要是通过自交繁殖，但能够在存在的男性异交交配系统动态。饥饿提高男性频率在特定的应变方式，通过差分男性生存在dauer曝光和dauer曝光后增加异交率。在最敏感的品系中，交配系统从主要自交变为几乎完全异交。与无性生物的兼性交配一样，C.秀丽线虫在压力下可能周期性地促进适应。这种生殖策略的转变应该对这些种群的进化变化产生重大影响，并且可能是其他高度自交生物以前未被认识的特征。
Sexual reproduction shuffles genetic variation, potentially enhancing the evolutionary response to environmental change. Many asexual organisms utilize facultative sexual reproduction as a means to escape the trap of low genetic diversity under stress. Self-fertilizing organisms are subject to similar genetic limitations: the consistent loss of genetic diversity within lineages restricts the production of variation through recombination. Selfing organisms may therefore benefit from a similar shift in mating strategy during periods of stress. We determined the effects of environmental stress via starvation and exposure to the stress-resistant dauer stage on mating system dynamics of Caenorhabditis elegans, which reproduces predominantly through self-fertilization but is capable of outcrossing in the presence of males. Starvation elevated male frequencies in a strain-specific manner through differential male survival during dauer exposure and increased outcrossing rates after dauer exposure. In the most responsive strain, the mating system changed from predominantly selfing to almost exclusively outcrossing. Like facultative sex in asexual organisms, facultative outcrossing in C. elegans may periodically facilitate adaptation under stress. Such a shift in reproductive strategy should have a major impact on evolutionary change within these populations and may be a previously unrecognized feature of other highly selfing organisms.
登录
查看更多内容
影响因子：
3.4
作者：
Harvey SC;Shorto A;Viney ME
通讯作者：
Viney ME
影响因子：
10.7
作者：
Haber, M;Schüngel, M;Schulenburg, H
通讯作者：
Schulenburg, H
影响因子：
3.3
作者：
Hadany, Lilach;Otto, Sarah P.
通讯作者：
Otto, Sarah P.
影响因子：
3.3
作者：
GABRIEL, W;LYNCH, M;BURGER, R
通讯作者：
BURGER, R
影响因子：
2.7
作者：
CASSADA, RC;RUSSELL, RL
通讯作者：
RUSSELL, RL