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3D chromatin remodelling in the germ line modulates genome evolutionary plasticity
Lucía Álvarez-González1,2, Frances Burden3, Dadakhalandar Doddamani3
1Departament de Biologia Cel·lular, Fisiologia i Immunologia, Universitat Autònoma de Barcelona, Cerdanyola del Vallès, Spain.
Nature Communications
|May 13, 2022
Summary
This study reveals how 3D chromosome folding in mouse germ cells influences genome evolution. Evolutionary breakpoint regions (EBRs) link DNA damage and ancestral genome structures during spermatogenesis.
Area of Science:
- Genomics
- Evolutionary Biology
- Cell Biology
Background:
- Chromosome folding significantly impacts gene regulation and genome evolution.
- The evolutionary consequences of 3D chromatin remodeling in germ cells remain largely unexplored.
Purpose of the Study:
- To investigate the interplay between 3D chromatin remodeling in mouse germ cells and evolutionary genome structure changes.
- To identify the dynamics of evolutionary breakpoint regions (EBRs) during mouse spermatogenesis.
Main Methods:
- Comprehensive integrative computational analysis of whole-genome sequences from 14 rodent species.
- Reconstruction of seven ancestral rodent genomes.
- Detection of lineage-specific chromosome rearrangements and analysis of EBRs' structural and epigenetic properties.
Main Results:
- Evolutionary breakpoint regions (EBRs) lack programmed meiotic DNA double-strand breaks (DSBs) and meiotic cohesins in primary spermatocytes.
- In post-meiotic cells, EBRs associate with DNA damage sites and long-range interaction regions.
- These regions recapitulate ancestral chromosomal configurations.
Conclusions:
- A model is proposed integrating evolutionary genome reshuffling with DNA damage response and germ cell spatial genome organization.
- This research sheds light on the evolutionary mechanisms shaping genome structure through chromatin dynamics.
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