Assessing The Contribution of Non-crossover (NCO) to Genetic Diversity From a Complete Recombination Map
- VernacularTitle:从完整重组图谱评估非交叉重组（NCO）对遗传多样性的贡献
- Author:
Zhi-Hao DU
1
;
Jing CANG
1
;
Guo-Qing LIU
1
Author Information
- Publication Type:Journal Article
- Keywords: meiotic recombination; crossover; non-crossover; gene conversion; de novo mutation
- From: Progress in Biochemistry and Biophysics 2026;53(10):2835-2840
- CountryChina
- Language:Chinese
- Abstract: Meiotic recombination is a core molecular event that generates genetic diversity in sexually reproducing organisms, and is of great significance for both genome evolution and proper chromosome segregation. Meiotic recombination occurs in two forms: crossover (CO) and non-crossover (NCO). Although NCO events are far more abundant than CO events, they have been difficult to detect. Consequently, previous research has largely focused on CO, leaving the characteristics and functional roles of NCO poorly understood. A recent study published in Nature used large-scale family-based whole-genome sequencing data to construct a high-resolution recombination map. This map revealed the mutational features induced by NCO—the dominant form of recombination—along with their sex-specific differences, and quantified, for the first time, the contribution of NCOs to de novo mutations and age-related effects, representing an important milestone in the field of meiotic recombination. Specifically, compared with paternal NCOs, maternal NCOs are fewer in number but span longer regions; they accumulate continuously with increasing maternal age and occur largely outside programmed recombination hotspots. NCOs also represent a major source of de novo mutations, with approximately 11% of maternal de novo mutations being attributable to NCOs. This study not only provides a high-resolution map of human meiotic recombination as a resource for future research, but also offers, for the first time, a genome‑wide perspective on the contribution of meiotic NCO recombination to genetic diversity.
