Natural variation of outcrossing in the hermaphroditic nematode Pristionchus pacificus.
Natural variation of outcrossing in the hermaphroditic nematode Pristionchus pacificus.
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DOI：
10.1186/1471-2148-9-75
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发表时间：
2009-04-20
影响因子：
3.4
通讯作者：
Pires-daSilva A
中科院分区：
文献类型：
--
作者：
Click A;Savaliya CH;Kienle S;Herrmann M;Pires-daSilva A
自交的进化可能与有害突变的固定增加有关，在某些条件下，这可能会导致物种灭绝。在线虫中，少数物种独立地进化出自花受精，这使它们成为研究这种交配系统进化后果的优秀模式系统。在这里，我们测定了影响太平洋Pristionchus两性线虫异交的各种参数，并将它们与更知名的秀丽线虫进行了比较。这些线虫物种在遗传多样性方面是不同的，这可以用异交率的差异来解释。我们发现，与线虫相似，雄性太平洋线虫是由自交两性产生的频率较低，是相对较差的交配伙伴。此外，不同品系之间的杂交表明，杂交后代的孵化规模比纯品系小，这是远交衰退的迹象。与线虫相比，太平洋隐杆线虫的幼体尺寸较小，带有X染色体的雄性精子能够与X-nullo精子竞争。结果表明，没有证据表明任何选择对太平洋对虾雄鱼有很强的作用。
Evolution of selfing can be associated with an increase in fixation of deleterious mutations, which in certain conditions can lead to species extinction. In nematodes, a few species evolved self-fertilization independently, making them excellent model systems to study the evolutionary consequences of this type of mating system. Here we determine various parameters that influence outcrossing in the hermaphroditic nematode Pristionchus pacificus and compare them to the better known Caenorhabditis elegans. These nematode species are distinct in terms of genetic diversity, which could be explained by differences in outcrossing rates. We find that, similarly to C. elegans, P. pacificus males are generated at low frequencies from self-fertilizing hermaphrodites and are relatively poor mating partners. Furthermore, crosses between different isolates reveal that hybrids have lower brood sizes than the pure strains, which is a sign of outbreeding depression. In contrast to C. elegans, P. pacificus has lower brood sizes and the male X-bearing sperm is able to outcompete the X-nullo sperm. The results indicate that there is no evidence of any selection acting very strongly on P. pacificus males.
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DOI：
10.1111/j.1095-8312.1984.tb01683.x
发表时间：
1984-01-01
影响因子：
1.9
作者：
CHARLESWORTH, D
通讯作者：
CHARLESWORTH, D
影响因子：
2.7
作者：
Dichtel-Danjoy, ML;Félix, MA
通讯作者：
Félix, MA
影响因子：
30.8
作者：
Dieterich, Christoph;Clifton, Sandra W.;Schuster, Lisa N.;Chinwalla, Asif;Delehaunty, Kimberly;Dinkelacker, Iris;Fulton, Lucinda;Fulton, Robert;Godfrey, Jennifer;Minx, Pat;Mitreva, Makedonka;Roeseler, Waltraud;Tian, Huiyu;Witte, Hanh;Yang, Shiaw-Pyng;Wilson, Richard K.;Sommer, Ralf J.
通讯作者：
Sommer, Ralf J.
影响因子：
64.5
作者：
Garcia, LR;Mehta, P;Sternberg, PW
通讯作者：
Sternberg, PW
影响因子：
1.5
作者：
Cutter, AD;Avilés, L;Ward, S
通讯作者：
Ward, S