Centromere Mitotic Recombination in Mammalian Cells

Overview

Journal J Cell Biol

Specialty Cell Biology

Date 2008 Jun 11

PMID 18541703

Citations 72

Authors

Isabel Jaco

Andres Canela

Elsa Vera

Maria A Blasco

Affiliations

Soon will be listed here.

Abstract

Centromeres are special structures of eukaryotic chromosomes that hold sister chromatid together and ensure proper chromosome segregation during cell division. Centromeres consist of repeated sequences, which have hindered the study of centromere mitotic recombination and its consequences for centromeric function. We use a chromosome orientation fluorescence in situ hybridization technique to visualize and quantify recombination events at mouse centromeres. We show that centromere mitotic recombination occurs in normal cells to a higher frequency than telomere recombination and to a much higher frequency than chromosome-arm recombination. Furthermore, we show that centromere mitotic recombination is increased in cells lacking the Dnmt3a and Dnmt3b DNA methyltransferases, suggesting that the epigenetic state of centromeric heterochromatin controls recombination events at these regions. Increased centromere recombination in Dnmt3a,3b-deficient cells is accompanied by changes in the length of centromere repeats, suggesting that prevention of illicit centromere recombination is important to maintain centromere integrity in the mouse.

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