Sinha M, et al. (2009) Recombinational repair within heterochromatin requires ATP-dependent chromatin remodeling. Cell 138(6):1109-21
Abstract: Heterochromatin plays a key role in protection of chromosome integrity by suppressing homologous recombination. In Saccharomyces cerevisiae, Sir2p, Sir3p, and Sir4p are structural components of heterochromatin found at telomeres and the silent mating-type loci. Here we have investigated whether incorporation of Sir proteins into minichromosomes regulates early steps of recombinational repair in vitro. We find that addition of Sir3p to a nucleosomal substrate is sufficient to eliminate yRad51p-catalyzed formation of joints, and that this repression is enhanced by Sir2p/Sir4p. Importantly, Sir-mediated repression requires histone residues that are critical for silencing in vivo. Moreover, we demonstrate that the SWI/SNF chromatin-remodeling enzyme facilitates joint formation by evicting Sir3p, thereby promoting subsequent Rad54p-dependent formation of a strand invasion product. These results suggest that recombinational repair in the context of heterochromatin presents additional constraints that can be overcome by ATP-dependent chromatin-remodeling enzymes.
| Status: Published | Type: Journal Article | Research Support, N.I.H., Extramural | Research Support, Non-U.S. Gov't | PubMed ID: 19766565 |
Topics addressed in this paper
Number of different genes curated to this paper: 56
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| Topics | Genes linked to topics (#1 - 10 ) | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| ACT1 | ARP4 | ARP5 | ARP6 | ARP7 | ARP8 | ARP9 | EAF1 | HHF1 | HHF2 | |
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| Topics | Genes linked to topics (#11 - 20 ) | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| HHT1 | HHT2 | HTL1 | IES1 | IES3 | IES4 | INO80 | LDB7 | MOT1 | NHP10 | |
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| Topics | Genes linked to topics (#21 - 30 ) | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| NPL6 | RAD54 | RSC1 | RSC2 | RSC3 | RSC30 | RSC4 | RSC58 | RSC6 | RSC8 | |
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| Topics | Genes linked to topics (#31 - 40 ) | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| RSC9 | RTT102 | RVB1 | RVB2 | SFH1 | SIR2 | SIR3 | SIR4 | SNF11 | SNF12 | |
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| Topics | Genes linked to topics (#41 - 50 ) | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| SNF2 | SNF5 | SNF6 | STH1 | SWC3 | SWC4 | SWC5 | SWC7 | SWI1 | SWI3 | |
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| Techniques and Reagents | | | | | | | | | | |
| Topics | Genes linked to topics (#51 - 56 ) | |||||
|---|---|---|---|---|---|---|
| SWP82 | SWR1 | TAF14 | VPS71 | VPS72 | YAF9 | |
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| Substrates/Ligands/Cofactors | | | ||||
| Techniques and Reagents | | | | | | |
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