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To SIR with Polycomb: linking silencing mechanisms
Vivek S Chopra1, Rakesh K Mishra
1Centre for Cellular and Molecular Biology, Hyderabad 500 007, India.
Summary
Yeast SIR2, a key deacetylase, is vital for epigenetic silencing. Its role in Drosophila suggests a link between Polycomb proteins and cellular processes like senescence.
Area of Science:
- Molecular Biology
- Genetics
- Epigenetics
Background:
- SIR2 is an evolutionarily conserved deacetylase crucial for epigenetic silencing in yeast.
- SIR2 is linked to chromatin silencing and lifespan regulation across organisms.
Purpose of the Study:
- To investigate the role of Drosophila SIR2 in epigenetic silencing.
- To explore the association of SIR2 with Polycomb group proteins.
Main Methods:
- Investigated the function of SIR2 in Drosophila.
- Examined the physical association of SIR2 with protein complexes.
Main Results:
- Drosophila SIR2 is involved in epigenetic silencing.
- SIR2 physically associates with a complex containing the E(Z) histone methyltransferase.
Conclusions:
- SIR2's function extends to Polycomb-mediated silencing in Drosophila.
- Findings suggest a connection between the Polycomb system and cellular processes, including senescence.