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Meiotic pairing through barcode-like satellite DNA repeats.
Lena Skrutl1,2, Ankita Chavan1,2, Anna Sintsova3
1Institute of Biochemistry, ETH Zürich, Zürich, Switzerland.
Nature Communications
|June 16, 2026
Summary
Satellite DNA repeats act as a barcode to guide homologous chromosome pairing during meiosis. Mismatches in these repeats disrupt pairing, impacting oocyte quality and evolution.
Area of Science:
- Genetics
- Molecular Biology
- Cell Biology
Background:
- Homologous chromosome pairing during meiosis is crucial for accurate genetic inheritance.
- While recombination is a known driver of pairing, alternative mechanisms exist.
- Non-coding DNA, particularly satellite DNA, has largely uncharacterized roles in chromosome dynamics.
Purpose of the Study:
- To investigate the role of satellite DNA repeats in homologous chromosome pairing during meiosis.
- To determine how satellite DNA sequence divergence affects meiotic pairing.
- To understand the consequences of meiotic pairing defects on oocyte viability and evolution.
Main Methods:
- Utilized satellite DNA deletion, duplication, and translocation strains in D. melanogaster.
- Analyzed meiotic pairing in natural populations with varying satellite DNA content.
- Investigated the involvement of HORMAD and Pachytene checkpoint 2 (Pch2) in pairing regulation.
- Assessed correlation between meiotic pairing defects and oocyte cell death.
Main Results:
- Satellite DNA repeats facilitate homologous chromosome pairing via a barcode-like mechanism.
- Mismatches in satellite DNA repeats significantly impair meiotic pairing, especially near centromeres.
- Divergence in satellite DNA content between natural populations leads to pairing defects.
- Compromised pairing correlates with increased mid-oogenesis cell death, suggesting a quality control mechanism.
Conclusions:
- Satellite DNA repeats play a critical, previously underappreciated role in meiotic homology detection and pairing.
- This repeat-based pairing mechanism imposes selective pressure, limiting satellite DNA divergence in interbreeding populations.
- Meiotic pairing defects, influenced by satellite DNA, are linked to oocyte quality control and prevention of aneuploidy.
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