当前位置：
X-MOL 学术
›
J. Zool. Syst. Evol. Res.
›
论文详情
Our official English website, www.x-mol.net, welcomes your
feedback! (Note: you will need to create a separate account there.)
First case of parthenogenesis in ladybirds (Coleoptera: Coccinellidae) suggests new mechanisms for the evolution of asexual reproduction
Journal of Zoological Systematics and Evolutionary Research ( IF 2.0 ) Pub Date : 2019-11-17 , DOI: 10.1111/jzs.12339 Alexandra Magro 1, 2 , Emilie Lecompte 1, 3 , Jean‐Louis Hemptinne 1, 2 , Antonio O. Soares 4 , Anne‐Marie Dutrillaux 5 , Jérôme Murienne 1, 3 , Helmut Fürsch 6 , Bernard Dutrillaux 5
Journal of Zoological Systematics and Evolutionary Research ( IF 2.0 ) Pub Date : 2019-11-17 , DOI: 10.1111/jzs.12339 Alexandra Magro 1, 2 , Emilie Lecompte 1, 3 , Jean‐Louis Hemptinne 1, 2 , Antonio O. Soares 4 , Anne‐Marie Dutrillaux 5 , Jérôme Murienne 1, 3 , Helmut Fürsch 6 , Bernard Dutrillaux 5
Affiliation
|
Parthenogenesis, the development of unfertilized eggs resulting in the exclusive production of female offspring, is rare in animals relative to sexual reproduction and is mainly reported in invertebrates. It has been hypothesized that polyploidy, hybridization and endosymbiont infections are its major causal events but the mechanisms triggering asexual reproduction remain unclear. Here, we study the proximate causes at the origin of parthenogenesis in the first reported case of asexuality in the Coccinellidae (Coleoptera). The asexual populations were found in the Azores and the Mascarene archipelagos, and were identified as Nephus voeltzkowi Weise, a bisexual species widespread in sub‐Saharan Africa. The specimens from both populations are diploid but present different karyotypes and heterozygosities that evoke hybrid origins, commonly associated with parthenogenesis in Coleoptera. However, the close proximity of their genomes (99.8% homology for the complete mitochondrial genome and 99.9% for the complete nuclear ribosomal cluster) together with the congruence between the mtDNA tree and the nuclear tree, and the low heterozygosity levels, suggests that the two populations are not hybrid. We propose that they belong to a single chromosomally polymorphic species undergoing Robertsonian fusions. Furthermore, specimens from both populations are infected with Wolbachia (supergroup B strain), contrary to sympatric bisexual species of the same genus. Although Wolbachia has been shown to induce parthenogenesis in haplodiploid organisms, it has been recently suggested that it could also induce parthenogenesis in hosts with other sex determination systems. Whether chromosome rearrangements and/or Wolbachia infections are post‐parthenogenetic events or are at the origin of parthenogenesis still needs to be determined.
中文翻译：
瓢虫孤雌生殖的第一个案例（鞘翅目：瓢虫科）提示了无性生殖进化的新机制
单性生殖，即未受精卵的发育导致雌性后代的独家生产，相对于有性生殖在动物中很少见，主要报道于无脊椎动物中。据推测，多倍体，杂交和共生菌感染是其主要病因，但引发无性繁殖的机制仍不清楚。在这里，我们研究了第一个报道的球虫（无翅目）无性生殖病例中孤雌生殖起源的最接近原因。在亚速尔群岛和玛斯卡琳群岛中发现了无性种群，并被确定为Nephus voeltzkowiWeise，一种在撒哈拉以南非洲广泛分布的双性恋物种。两种种群的标本均为二倍体，但呈现出不同的核型和杂合性，它们引起杂种起源，通常与鞘翅目单性生殖有关。然而，它们的基因组非常接近（完整的线粒体基因组有99.8％的同源性，完整的核糖体簇有99.9％的同源性），以及mtDNA树和核树之间的一致性，以及低杂合度，这表明两者人口不是杂种。我们提出，它们属于经历罗伯逊融合的单个染色体多态性物种。此外，两个种群的标本都感染了沃尔巴克氏菌（超群B株），与同属的同伴双性恋物种相反。尽管已经证明了沃尔巴克氏菌会在单倍体生物体中诱导孤雌生殖，但是最近有人提出，它也可以通过其他性别决定系统在宿主中诱导孤雌生殖。染色体重排和/或Wolbachia感染是孤雌生殖后事件还是孤雌生殖的起源仍需要确定。
更新日期：2019-11-17
中文翻译：
瓢虫孤雌生殖的第一个案例（鞘翅目：瓢虫科）提示了无性生殖进化的新机制
单性生殖，即未受精卵的发育导致雌性后代的独家生产，相对于有性生殖在动物中很少见，主要报道于无脊椎动物中。据推测，多倍体，杂交和共生菌感染是其主要病因，但引发无性繁殖的机制仍不清楚。在这里，我们研究了第一个报道的球虫（无翅目）无性生殖病例中孤雌生殖起源的最接近原因。在亚速尔群岛和玛斯卡琳群岛中发现了无性种群，并被确定为Nephus voeltzkowiWeise，一种在撒哈拉以南非洲广泛分布的双性恋物种。两种种群的标本均为二倍体，但呈现出不同的核型和杂合性，它们引起杂种起源，通常与鞘翅目单性生殖有关。然而，它们的基因组非常接近（完整的线粒体基因组有99.8％的同源性，完整的核糖体簇有99.9％的同源性），以及mtDNA树和核树之间的一致性，以及低杂合度，这表明两者人口不是杂种。我们提出，它们属于经历罗伯逊融合的单个染色体多态性物种。此外，两个种群的标本都感染了沃尔巴克氏菌（超群B株），与同属的同伴双性恋物种相反。尽管已经证明了沃尔巴克氏菌会在单倍体生物体中诱导孤雌生殖，但是最近有人提出，它也可以通过其他性别决定系统在宿主中诱导孤雌生殖。染色体重排和/或Wolbachia感染是孤雌生殖后事件还是孤雌生殖的起源仍需要确定。
京公网安备 11010802027423号