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J. Biol. Chem., Vol. 261, Issue 19, 8585-8588, 07, 1986

Stability of nucleosome placement in newly repaired regions of DNA

KA Nissen, SY Lan and MJ Smerdon

Rearrangements of chromatin structure during excision repair of UV- damaged DNA appear to involve unfolding of nucleosomal DNA while repair is taking place, followed by refolding of this DNA into a native nucleosome structure. Recently, we found that repair patches are not distributed uniformly along the DNA in nucleosome core particles immediately following their refolding into nucleosomes (Lan, S. Y., and Smerdon, M. J. (1985) Biochemistry, 24,7771). Therefore, the distribution of repair patches in nucleosome core DNA was used to monitor the stability of nucleosome placement in these regions. Our results indicate that in nondividing human cells undergoing excision repair there is a slow change in the positioning of nucleosomes in newly repaired regions of chromatin, resulting in the eventual randomization of repair patches in nucleosome core DNA. Furthermore, the nonrandom placement of nucleosomes observed just after the refolding event is not re-established during DNA replication. Possible mechanisms for this change in nucleosome placement along the DNA are discussed.
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