Co-expression of MEIOTIC-TOPOISOMERASE VIB-dCas9 with guide RNAs specific to a recombination hotspot is insufficient to increase crossover frequency in Arabidopsis.
Genetics Society of America
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Elina, N. (., Holland, D., Gonzalez-Jorge, S., Hirsz, D., Yang, Z., & Henderson, I. (2022). Co-expression of MEIOTIC-TOPOISOMERASE VIB-dCas9 with guide RNAs specific to a recombination hotspot is insufficient to increase crossover frequency in Arabidopsis.. G3 (Bethesda) https://doi.org/10.1093/g3journal/jkac105
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 co-express a MTOPVIB-dCas9 fusion protein with guide RNAs specific to the 3a crossover hotspot. 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.
meiosis, crossover, targeted recombination, CRISPR/Cas9, MTOPVIB
BBSRC, Broodbank Trust, Gatsby Charitable Foundation
Gatsby Charitable Foundation (GAT3587)
External DOI: https://doi.org/10.1093/g3journal/jkac105
This record's URL: https://www.repository.cam.ac.uk/handle/1810/336581
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