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首页> 外文期刊>Genomics >New insights on the evolution of Leafy cotyledon1 (LEC1) type genes in vascular plants
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New insights on the evolution of Leafy cotyledon1 (LEC1) type genes in vascular plants

机译：维管植物叶状子叶1（LEC1）基因进化的新见解

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摘要

NF-Y is a conserved oligomeric transcription factor found in all eukaryotes. In plants, this regulator evolved with a broad diversification of the genes coding for its three subunits (NF-YA, NF-YB and NF-YC). The NF-YB members can be divided into Leafy Cotyledon1 (LEC1) and non-LEC1 types. Here we presented a comparative genomic study using phylogenetic analyses to validate an evolutionary model for the origin of LEC-type genes in plants and their emergence from non-LEC1-type genes. We identified LEC1-type members in all vascular plant genomes, but not in amoebozoa, algae, fungi, metazoa and non-vascular plant representatives, which present exclusively non-LEC1-type genes as constituents of their NF-YB subunits. The non-synonymous to synonymous nucleotide substitution rates (Ka/Ks) between LEC1 and non-LEC1-type genes indicate the presence of positive selection acting on LEC1-type members to the fixation of LEC1-specific amino acid residues. The phylogenetic analyses demonstrated that plant LEC1-type genes are evolutionary divergent from the non-LEC1-type genes of plants, fungi, amoebozoa, algae and animals. Our results point to a scenario in which LEC1-type genes have originated in vascular plants after gene expansion in plants. We suggest that processes of neofunctionalization and/or subfunctionalization were responsible for the emergence of a versatile role for LEC1-type genes in vascular plants, especially in seed plants. LEC1-type genes besides being phylogenetic divergent also present different expression profile when compared with non-LEC1-type genes. Altogether, our data provide new insights about the LEC1 and non-LEC1 evolutionary relationship during the vascular plant evolution. ?Plant LEC1-type genes are evolutionary divergent from non-LEC1-type genes of plants, fungi, amoebozoa, algae and animals.
机译：NF-Y是在所有真核生物中发现的保守的寡聚转录因子。在植物中，这种调节子随着其三个亚基（NF-YA，NF-YB和NF-YC）编码基因的广泛多样化而进化。 NF-YB成员可分为叶状子叶1（LEC1）和非LEC1类型。在这里，我们介绍了一个比较的基因组研究，利用系统发育分析来验证植物中LEC型基因的起源以及它们从非LEC1型基因出现的进化模型。我们在所有维管植物基因组中鉴定出LEC1型成员，但在变形虫，藻类，真菌，后生动物和非维管植物代表中均未鉴定出LEC1型成员，这些成员仅将非LEC1型基因作为其NF-YB亚基的组成部分。 LEC1和非LEC1型基因之间的同义核苷酸替代率（Ka / Ks）不同义，表明存在作用于LEC1型成员的正选择作用，以固定LEC1特异性氨基酸残基。系统发育分析表明，植物LEC1型基因与植物，真菌，变形虫，藻类和动物的非LEC1型基因进化不同。我们的结果指出了一种场景，其中LEC1型基因在植物中的基因扩增后起源于维管植物。我们建议新功能化和/或亚功能化的过程是负责维管植物，尤其是种子植物中LEC1型基因的多功能角色的出现。与非LEC1型基因相比，LEC1型基因除了在系统发育上分歧外，还表现出不同的表达特征。总之，我们的数据提供了有关维管植物进化过程中LEC1和非LEC1进化关系的新见解。植物LEC1型基因与植物，真菌，变形虫，藻类和动物的非LEC1型基因进化不同。

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