同源交叉具有远端偏向性，是拟南芥第一代新全多倍体基因组不稳定的基础。

IF 8.7 1区 生物学 Q1 PLANT SCIENCES New Phytologist Pub Date : 2024-09-06 DOI:10.1111/nph.20095
Candida Nibau, Aled Evans, Holly King, Dylan Wyn Phillips, Andrew Lloyd
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引用次数: 0

摘要

与成熟的野生多倍体相比，第一代多倍体往往存在更多的减数分裂错误，生育率也更低。约 16000 代前起源的拟南芥（Arabidopsis suecica）全多倍体模式种就是这样一个例子。我们在此结合细胞学和基因组学方法，对自然进化的拟南芥和第一代 "合成 "拟南芥的减数分裂及其结果进行了比较。我们发现，自然品系的减数分裂在很大程度上类似于二倍体，而合成品系的减数分裂错误率很高，包括不完全合成和非同源交叉的形成。对后代的全基因组重测序显示，合成亲本的同源交换水平高出 20 倍，非整倍体水平高出 8 倍。同源交换显示出强烈的远端偏向，主要发生在基因中，经常产生新的蛋白质变体。我们还观察到，当同源交换发生在倒置同源区时，会产生兆位级的 INDEL。最后，我们观察到在适应多倍体方面存在性别特异性差异的证据，当合成植物作为雌性亲本时，与天然品系的互交成功率更高。我们的研究结果将A. suecica的细胞学表型与其基因组结果直接联系起来，证明同源杂交是新多倍体基因组不稳定的原因，而且比同源杂交更具远端偏向性。
本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Homoeologous crossovers are distally biased and underlie genomic instability in first-generation neo-allopolyploid Arabidopsis suecica

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New Phytologist
New Phytologist 生物-植物科学
自引率
5.30%
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728
期刊介绍： New Phytologist is an international electronic journal published 24 times a year. It is owned by the New Phytologist Foundation, a non-profit-making charitable organization dedicated to promoting plant science. The journal publishes excellent, novel, rigorous, and timely research and scholarship in plant science and its applications. The articles cover topics in five sections: Physiology & Development, Environment, Interaction, Evolution, and Transformative Plant Biotechnology. These sections encompass intracellular processes, global environmental change, and encourage cross-disciplinary approaches. The journal recognizes the use of techniques from molecular and cell biology, functional genomics, modeling, and system-based approaches in plant science. Abstracting and Indexing Information for New Phytologist includes Academic Search, AgBiotech News & Information, Agroforestry Abstracts, Biochemistry & Biophysics Citation Index, Botanical Pesticides, CAB Abstracts®, Environment Index, Global Health, and Plant Breeding Abstracts, and others.
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