Comparative Genomics Supports Sex and Meiosis in Diverse Amoebozoa.
Comparative Genomics Supports Sex and Meiosis in Diverse Amoebozoa.
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DOI：
10.1093/gbe/evy241
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发表时间：
2018-11-01
影响因子：
3.3
通讯作者：
Lahr DJG
中科院分区：
文献类型：
--
作者：
Hofstatter PG;Brown MW;Lahr DJG
在动物和植物中，性和生殖通常被视为一个单一的现象，因为在这些生物中，生殖意味着混合和减数分裂。相反，性和生殖是独立的生物现象，在大多数真核生物中可能有联系，也可能没有联系。目前的证据支持真核生物祖先具有交配型系统和减数分裂，这是真核生物独有的过程。尽管性是祖传的，但关于变形虫谱系的生命周期的文献将它们描述为无性生物。如果在植物、动物和真菌中很少有性丧失，如果有性丧失的话，为什么在变形虫中会很常见呢？解决“无性”动物减数分裂问题的一种方法是评估参与交配和减数分裂的蛋白质基因的发生模式。我们已经应用比较基因组的方法来研究阿米巴原虫（一种主要的阿米巴原虫超级类群）的浆胚、核核和减数分裂机制的发生。我们的结果支持在所有主要变形虫谱系中发生的合子和减数分裂过程的假设。我们的结论是，大多数阿米巴原虫可能通过典型减数分裂过程进行混合、重组和倍性减少。目前的证据表明，在许多传统上被认为是无性的血统中，有性循环的可能性。
Sex and reproduction are often treated as a single phenomenon in animals and plants, as in these organisms reproduction implies mixis and meiosis. In contrast, sex and reproduction are independent biological phenomena that may or may not be linked in the majority of other eukaryotes. Current evidence supports a eukaryotic ancestor bearing a mating type system and meiosis, which is a process exclusive to eukaryotes. Even though sex is ancestral, the literature regarding life cycles of amoeboid lineages depicts them as asexual organisms. Why would loss of sex be common in amoebae, if it is rarely lost, if ever, in plants and animals, as well as in fungi? One way to approach the question of meiosis in the “asexuals” is to evaluate the patterns of occurrence of genes for the proteins involved in syngamy and meiosis. We have applied a comparative genomic approach to study the occurrence of the machinery for plasmogamy, karyogamy, and meiosis in Amoebozoa, a major amoeboid supergroup. Our results support a putative occurrence of syngamy and meiotic processes in all major amoebozoan lineages. We conclude that most amoebozoans may perform mixis, recombination, and ploidy reduction through canonical meiotic processes. The present evidence indicates the possibility of sexual cycles in many lineages traditionally held as asexual.
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影响因子：
64.5
作者：
Chikashige, Y;Tsutsumi, C;Hiraoka, Y
通讯作者：
Hiraoka, Y
DOI：
10.1098/rspb.2013.1755
发表时间：
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