替代性双链断裂修复途径决定了蜜蜂高重组的进化。

IF 2.3 2区 农林科学 Q3 BIOCHEMISTRY & MOLECULAR BIOLOGY
Bertrand Fouks,Katelyn J Miller,Caitlin Ross,Corbin Jones,Olav Rueppell
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引用次数: 0

摘要

社会性昆虫,尤其是蜜蜂,基因组的基因重组频率特别高。人们对这一现象及其内在机制知之甚少。为了描述蜜蜂基因组中交叉和基因转换的模式,我们通过全基因组重测序生成了 187 个蜜蜂兄弟的基因重组图谱。重组事件分布不均,没有许多真正的热点。相移之间的道长度呈双峰分布,表明存在不同的交叉和基因转换事件。交叉主要发生在富含 G/C 的区域,似乎会导致 G/C 富集,而基因转换则主要发生在富含 A/T 的区域。与交叉相关或远离交叉的基因转换序列的核苷酸组成与交叉和基因转换之间的差异相对应。这些综合结果表明,蜜蜂减数分裂过程中有两种类型的DNA双链断裂修复:一种是非规范同源重组,导致基因转换和基因组A/T富集;另一种是规范同源重组,基于完成的双霍利迪连接,可导致基因转换或交叉,并与G/C偏向有关。这种 G/C 偏向可能是为了平衡社会性膜翅目昆虫基因组中富含 A/T 的碱基组成而选择的。没有证据表明双链断裂修复偏好同源重组,这表明蜜蜂的高基因组重组率主要是高双链断裂率的结果,而高双链断裂率又可能是蜜蜂的生活史及其富含A/T-的基因组的结果。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Alternative double strand break repair pathways shape the evolution of high recombination in the honey bee, Apis mellifera.
Social insects, particularly honey bees, have exceptionally high genomic frequencies of genetic recombination. This phenomenon and underlying mechanisms are poorly understood. To characterise the patterns of crossovers and gene conversion in the honey bee genome, a recombination map of 187 honey bee brothers was generated by whole-genome resequencing. Recombination events were heterogeneously distributed without many true hotspots. The tract lengths between phase shifts were bimodally distributed, indicating distinct crossover and gene conversion events. While crossovers predominantly occurred in G/C-rich regions and seemed to cause G/C enrichment, the gene conversions were found predominantly in A/T-rich regions. The nucleotide composition of sequences involved in gene conversions that were associated with or distant from crossovers corresponded to the differences between crossovers and gene conversions. These combined results suggest two types of DNA double-strand break repair during honey bee meiosis: non-canonical homologous recombination, leading to gene conversion and A/T enrichment of the genome, and the canonical homologous recombination based on completed double Holliday Junctions, which can result in gene conversion or crossover and is associated with G/C bias. This G/C bias may be selected for to balance the A/T-rich base composition of eusocial hymenopteran genomes. The lack of evidence for a preference of the canonical homologous recombination for double-strand break repair suggests that the high genomic recombination rate of honey bees is mainly the consequence of a high rate of double-strand breaks, which could in turn result from the life history of honey bees and their A/T-rich genome.
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来源期刊
Insect Molecular Biology
Insect Molecular Biology 生物-昆虫学
CiteScore
4.80
自引率
3.80%
发文量
68
审稿时长
6-12 weeks
期刊介绍: Insect Molecular Biology has been dedicated to providing researchers with the opportunity to publish high quality original research on topics broadly related to insect molecular biology since 1992. IMB is particularly interested in publishing research in insect genomics/genes and proteomics/proteins. This includes research related to: • insect gene structure • control of gene expression • localisation and function/activity of proteins • interactions of proteins and ligands/substrates • effect of mutations on gene/protein function • evolution of insect genes/genomes, especially where principles relevant to insects in general are established • molecular population genetics where data are used to identify genes (or regions of genomes) involved in specific adaptations • gene mapping using molecular tools • molecular interactions of insects with microorganisms including Wolbachia, symbionts and viruses or other pathogens transmitted by insects Papers can include large data sets e.g.from micro-array or proteomic experiments or analyses of genome sequences done in silico (subject to the data being placed in the context of hypothesis testing).
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