Ndy1/KDM2B immortalizes mouse embryonic fibroblasts by repressing the Ink4a/Arf locus
Research output: Contribution to journal › Journal article › Research › peer-review
The histone H3 demethylase Not dead yet-1 (Ndy1/KDM2B) is a physiological inhibitor of senescence. Here, we show that Ndy1 is down-regulated during senescence in mouse embryonic fibroblasts (MEFs) and that it represses the Ink4a/Arf locus. Ndy1 counteracts the senescence-associated down-regulation of Ezh2, a component of polycomb-repressive complex (PRC) 2, via a JmjC domain-dependent process leading to the global and Ink4a/Arf locus-specific up-regulation of histone H3K27 trimethylation. The latter promotes the Ink4a/Arf locus-specific binding of Bmi1, a component of PRC1. Ndy1, which interacts with Ezh2, also binds the Ink4a/Arf locus and demethylates the locus-associated histone H3K36me2 and histone H3K4me3. The combination of histone modifications driven by Ndy1 interferes with the binding of RNA Polymerase II, resulting in the transcriptional silencing of the Ink4a/Arf locus and contributing to the Ndy1 immortalization phenotype. Other studies show that, in addition to inhibiting replicative senescence, Ndy1 inhibits Ras oncogene-induced senescence via a similar molecular mechanism.
Original language | English |
---|---|
Journal | Proceedings of the National Academy of Sciences of the United States of America |
Volume | 106 |
Issue number | 8 |
Pages (from-to) | 2641-6 |
Number of pages | 6 |
ISSN | 0027-8424 |
DOIs | |
Publication status | Published - 24 Feb 2009 |
Externally published | Yes |
- Animals, Cell Aging, Cell Line, Transformed, Cyclin-Dependent Kinase Inhibitor p16, Fibroblasts, Gene Expression Regulation, Developmental, Histone-Lysine N-Methyltransferase, Histones, Methylation, Mice, Nuclear Proteins, Oxidoreductases, N-Demethylating, Polycomb Repressive Complex 1, Polycomb Repressive Complex 2, Proto-Oncogene Proteins, Repressor Proteins, Up-Regulation
Research areas
ID: 159085042