Downregulation of Barley Regulator of Telomere Elongation Helicase 1 Alters the Distribution of Meiotic Crossovers.

Downregulation of Barley Regulator of Telomere Elongation Helicase 1 Alters the Distribution of Meiotic Crossovers.
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DOI:
10.3389/fpls.2021.745070
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发表时间:
2021
影响因子:
5.6
通讯作者:
Waugh R
Waugh R
中科院分区:
生物学2区
文献类型:
--
作者:
Barakate A;Arrieta M;Macaulay M;Vivera S;Davidson D;Stephens J;Orr J;Schreiber M;Ramsay L;Halpin C;Waugh R

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程序性减数分裂DNA双链断裂(DSB)是染色体分离和配子形成所必需的,通过同源重组(HR)作为交换(CO)或非交换(NCO)进行修复。对管制国家办事处数量和分布的机制仍然知之甚少。端粒延伸解旋酶1(RTEL 1)DNA解旋酶的调节剂先前被证明在秀丽隐杆线虫中加强减数分裂CO的数量,但其在植物中的功能仅在营养期被研究。在这里,我们使用先前从营养和生殖器官和组织中获得的RNA-seq数据表征了大麦RTEL 1基因的结构和表达。使用RNAi,我们特异性下调了生殖组织中的RTEL 1表达,并使用大麦50 k iSelect SNP阵列分析了其对重组的影响。不像C。在分离RNAi下调的RTEL 1的群体中,高分辨率全基因组遗传分析显示大麦染色体远端区域的CO显著增加,而其总数没有变化。我们的数据揭示了RTEL 1解旋酶在植物减数分裂和重组控制中的重要作用。
Programmed meiotic DNA double-strand breaks (DSBs), necessary for proper chromosomal segregation and viable gamete formation, are repaired by homologous recombination (HR) as crossovers (COs) or non-crossovers (NCOs). The mechanisms regulating the number and distribution of COs are still poorly understood. The regulator of telomere elongation helicase 1 (RTEL1) DNA helicase was previously shown to enforce the number of meiotic COs in Caenorhabditis elegans but its function in plants has been studied only in the vegetative phase. Here, we characterised barley RTEL1 gene structure and expression using RNA-seq data previously obtained from vegetative and reproductive organs and tissues. Using RNAi, we downregulated RTEL1 expression specifically in reproductive tissues and analysed its impact on recombination using a barley 50k iSelect SNP Array. Unlike in C. elegans, in a population segregating for RTEL1 downregulated by RNAi, high resolution genome-wide genetic analysis revealed a significant increase of COs at distal chromosomal regions of barley without a change in their total number. Our data reveal the important role of RTEL1 helicase in plant meiosis and control of recombination.
DOI: 10.1093/oxfordjournals.molbev.a026334
发表时间: 2000-04-01
影响因子: 10.7
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期刊: PLOS GENETICS
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