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Updated: Jul 4, 2026
09:24
Preparation of Meiotic Chromosome Spreads from Mouse Oocytes for Assessment of Synapsis and Recombination
Published on: July 18, 2025
Centromere mitotic recombination in mammalian cells
Isabel Jaco1, Andrés Canela, Elsa Vera
1Telomeres and Telomerase Group, Molecular Oncology Program, Spanish National Cancer Centre, 28029 Madrid, Spain.
The Journal of Cell Biology
|June 11, 2008
Summary
Centromere recombination occurs frequently in normal mouse cells. DNA methyltransferase deficiency increases this recombination, impacting centromere integrity.
Area of Science:
- Genetics
- Epigenetics
- Molecular Biology
Background:
- Centromeres are crucial for chromosome segregation during cell division.
- Repetitive sequences at centromeres complicate studies of recombination and function.
- Understanding centromere recombination is key to centromeric integrity.
Purpose of the Study:
- To quantify mitotic recombination at mouse centromeres.
- To investigate the role of epigenetic state in centromere recombination.
- To determine the consequences of altered centromere recombination.
Main Methods:
- Utilized chromosome orientation fluorescence in situ hybridization (CO-FISH).
- Visualized and quantified recombination events at mouse centromeres.
- Compared recombination frequencies between centromeres, telomeres, and chromosome arms.
Main Results:
- Centromere mitotic recombination occurs at a higher frequency than telomere or chromosome-arm recombination.
- Recombination at centromeres is significantly increased in cells lacking Dnmt3a and Dnmt3b DNA methyltransferases.
- Increased centromere recombination correlates with changes in centromere repeat length.
Conclusions:
- Epigenetic regulation by DNA methyltransferases influences centromere recombination.
- Preventing aberrant centromere recombination is vital for maintaining centromere integrity in mice.
- This study provides insights into the mechanisms controlling centromeric heterochromatin and recombination.
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