Modina S A, Kusliy M A, Malikov D G, Molodtseva A S
Institute of Molecular and Cellular Biology of the Siberian Branch of the Russian Academy of Sciences, Novosibirsk, Russia Novosibirsk State University, Novosibirsk, Russia.
Institute of Molecular and Cellular Biology of the Siberian Branch of the Russian Academy of Sciences, Novosibirsk, Russia.
Vavilovskii Zhurnal Genet Selektsii. 2024 Sep;28(5):571-577. doi: 10.18699/vjgb-24-63.
To date, a number of studies have been published on the phylogenetics of woolly mammoths (Mammuthus primigenius), ranging from analyses of parts of the mitochondrial genome to studies of complete nuclear genomes. However, until recently nothing was known about the genetic diversity of woolly mammoths in southern Siberia, in the Minusinsk Depression in particular. Within the framework of this effort, libraries for high-throughput sequencing of seven bone samples of woolly mammoths were obtained, two-round enrichment using biotinylated probes of modern mtDNA of Elephas maximus immobilised on magnetic microspheres and sequencing with subsequent bioinformatic analysis were carried out. Phylogenetic reconstructions showed the presence of all studied mammoths in clade I, which expanded its range. The assignment of mammoth mitotypes in the Minusinsk Depression to different clusters within clade I may indicate a sufficiently high diversity of their gene pool. Phylogeographic reconstructions revealed a genetic proximity of mitochondrial lineages of Late Pleistocene mammoths of the Minusinsk Depression and other regions of eastern Siberia and estimated their divergence time in the range of 100-150 thousand years ago, which indicates active migrations of woolly mammoths over vast territories of eastern Siberia in the late Middle Pleistoceneearly Late Pleistocene.
迄今为止,已经发表了许多关于猛犸象(Mammuthus primigenius)系统发育学的研究,范围从线粒体基因组部分的分析到完整核基因组的研究。然而,直到最近,关于西西伯利亚南部,特别是米努辛斯克凹陷地区猛犸象的遗传多样性仍一无所知。在这项工作的框架内,获取了七个猛犸象骨骼样本用于高通量测序的文库,进行了两轮富集,使用固定在磁性微球上的亚洲象(Elephas maximus)现代线粒体DNA的生物素化探针,并随后进行测序及生物信息学分析。系统发育重建显示所有研究的猛犸象都存在于进化枝I中,该进化枝扩大了其范围。将米努辛斯克凹陷地区猛犸象的线粒体类型分配到进化枝I内的不同簇中,可能表明它们的基因库具有足够高的多样性。系统地理学重建揭示了米努辛斯克凹陷地区晚更新世猛犸象与东西伯利亚其他地区线粒体谱系的遗传亲缘关系,并估计它们的分化时间在10万至15万年前,这表明在中更新世晚期至晚更新世早期,猛犸象在东西伯利亚的广大地区进行了活跃的迁徙。