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首页> 外文期刊>Molecular cytogenetics >Chromosomal organization and evolutionary history of Mariner transposable elements in Scarabaeinae coleopterans
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Chromosomal organization and evolutionary history of Mariner transposable elements in Scarabaeinae coleopterans

机译：鞘翅目金龟子中水手转座因子的染色体组织和进化史

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Background With the aim to increase the knowledge on the evolution of coleopteran genomes, we investigated through cytogenetics and nucleotide sequence analysis Mariner transposons in three Scarabaeinae species (Coprophanaeus cyanescens, C. ensifer and Diabroctis mimas). Results The cytogenetic mapping revealed an accumulation of Mariner transposon in the pericentromeric repetitive regions characterized as rich in heterochromatin and C0t-1 DNA fraction (DNA enriched with high and moderately repeated sequences). Nucleotide sequence analysis of Mariner revealed the presence of two major groups of Mariner copies in the three investigated coleoptera species. Conclusions The Mariner is accumulated in the centromeric area of the coleopteran chromosomes probably as a consequence of the absence of recombination in the heterochromatic regions. Our analysis detected high diversification of Mariner sequences during the evolutionary history of the group. Furthermore, comparisons between the coleopterans sequences with other insects and mammals, suggest that the horizontal transfer (HT) could have acted in the spreading of the Mariner in diverse non-related animal groups.
机译：背景为了提高对鞘翅目基因组进化的了解，我们通过细胞遗传学和核苷酸序列分析研究了三种金龟子科物种（Coprophanaeus cyanescens，C。ensifer和Diabroctis mimas）中的Mariner转座子。结果细胞遗传学图谱显示，Mariner转座子在着重于着丝粒的重复区域中积累，其特征是富含异染色质和C0t-1 DNA片段（富含高和中等重复序列的DNA）。 Mariner的核苷酸序列分析表明，在三个调查鞘翅目物种中存在两个主要的Mariner副本组。结论Mariner积累在鞘翅目染色体着丝粒区域中，这可能是由于异色区域中没有重组的结果。我们的分析在该小组的进化历史中发现了Mariner序列的高度多样化。此外，鞘翅目序列与其他昆虫和哺乳动物之间的比较表明，水平转移（HT）可能在各种无关动物群中的水手传播中起作用。

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