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April 2020

Meiotic recombination is initiated by generating DNA double-strand breaks (DSBs) via SPO11, a topoisomerase-related enzyme. The activity of SPO11 protein must be tightly regulated, given its potential threat to genome integrity. The surface-rendering image of a maize meiocyte shows that numerous SPO11-1 foci (green) are located within chromatin (blue) which is partially displayed, whereas only a small fraction of SPO11-1, correlating with DSB number, is loaded on DSY2-labeled chromosome axes (red). The analysis of maize spo11-1 mutants further suggests a possible SPO11-1-dependent mechanism which mediates conformational changes of meiotic chromosome axes. See Ku et al.

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Image Credit: Chiting Wang, Jeremy Catinot and Chung-Ju Rachel Wang.

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