CRISPR targeting of MEIOTIC-TOPOISOMERASE VIB-dCas9 to a recombination hotspot is insufficient to increase crossover frequency in Arabidopsis
CRISPR targeting of MEIOTIC-TOPOISOMERASE VIB-dCas9 to a recombination hotspot is insufficient to increase crossover frequency in Arabidopsis
Abstract During meiosis, homologous chromosomes pair and recombine, which can result in reciprocal crossovers that increase genetic diversity. Crossovers are unevenly distributed along eukaryote chromosomes and show repression in heterochromatin and the centromeres. Within the chromosome arms crossovers are often concentrated in hotspots, which are typically in the kilobase range. The uneven distribution of crossovers along chromosomes, together with their low number per meiosis, creates a limitation during crop breeding, where recombination can be beneficial. Therefore, targeting crossovers to specific genome locations has the potential to accelerate crop improvement. In plants, meiotic crossovers are initiated by DNA double strand breaks (DSBs) that are catalysed by SPO11 complexes, which consist of two catalytic (SPO11-1 and SPO11-2) and two non-catalytic subunits (MTOPVIB). We used the model plant Arabidopsis thaliana to target a dCas9-MTOPVIB fusion protein to the 3a crossover hotspot via CRISPR. We observed that this was insufficient to significantly change meiotic crossover frequency or pattern within 3a. We discuss the implications of our findings for targeting meiotic recombination within plant genomes.
Yelina Nataliya E.、Yang Ziyi、Henderson Ian R.、Gonzalez-Jorge Sabrina、Hirsz Dominique
Department of Plant Sciences, University of CambridgeDepartment of Plant Sciences, University of CambridgeDepartment of Plant Sciences, University of CambridgeDepartment of Plant Sciences, University of CambridgeDepartment of Plant Sciences, University of Cambridge
遗传学植物学生物科学研究方法、生物科学研究技术
Yelina Nataliya E.,Yang Ziyi,Henderson Ian R.,Gonzalez-Jorge Sabrina,Hirsz Dominique.CRISPR targeting of MEIOTIC-TOPOISOMERASE VIB-dCas9 to a recombination hotspot is insufficient to increase crossover frequency in Arabidopsis[EB/OL].(2025-03-28)[2025-04-26].https://www.biorxiv.org/content/10.1101/2021.02.01.429210.点此复制
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