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Updated: Jan 20, 2026

Frequency and Distribution of Crossovers in Caenorhabditis elegans Meiosis by SNP Genotyping using Real-time PCR
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Frequency and Distribution of Crossovers in Caenorhabditis elegans Meiosis by SNP Genotyping using Real-time PCR

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Crossover Interference, Crossover Maturation, and Human Aneuploidy.

Shunxin Wang1,2,3, Yanlei Liu1,2,3, Yongliang Shang1,2,3

  • 1Center for Reproductive Medicine, Shandong University, Jinan, Shandong, 250012, China.

Bioessays : News and Reviews in Molecular, Cellular and Developmental Biology
|August 20, 2019
PubMed
Summary
This summary is machine-generated.

Human female reproduction has many aneuploid gametes due to chromosome segregation errors. About 25% of crossover intermediates fail, explaining aneuploidy and the maternal age effect.

Keywords:
aneuploidycrossovershuman female meiosismaternal age effectsrecombinationsister cohesion

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Area of Science:

  • Reproductive Biology
  • Genetics
  • Cell Biology

Background:

  • Human female gametes frequently exhibit aneuploidy (aberrant chromosome number), a condition that increases with maternal age.
  • Accurate chromosome segregation relies on DNA crossovers (COs) and sister chromatid cohesion.
  • While CO designation occurs normally, a significant failure rate in CO maturation contributes to aneuploidy.

Purpose of the Study:

  • To review advances in understanding crossing over and CO interference in human females.
  • To discuss the implications of inefficient CO maturation on aneuploidy.
  • To explore the link between CO maturation failure, maternal age, and aneuploidy.

Main Methods:

  • Review of modern scientific literature on crossing over and CO interference.
  • Analysis of the biological mechanisms underlying CO maturation.
  • Integration of findings to explain aneuploidy rates and maternal age effects.

Main Results:

  • Approximately 25% of designated crossover intermediates in human females fail to mature into final CO products.
  • This CO maturation inefficiency is a primary driver of the high baseline aneuploidy observed in women.
  • The failure rate is predicted to interact with age-related loss of cohesion, exacerbating aneuploidy in older women.

Conclusions:

  • Inefficient crossover maturation is a critical factor contributing to aneuploidy in human female reproduction.
  • This inefficiency, combined with age-dependent cohesion loss, provides a mechanistic explanation for the maternal age effect on aneuploidy.
  • Future research should focus on the molecular mechanisms of CO maturation and its regulation.