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• W2009707610 abstract "C to T mutation hotspots in skin cancers occur primarily at methylated CpG sites that coincide with sites of UV-induced cyclobutane pyrimidine dimer (CPD) formation. These mutations are proposed to arise from the insertion of A by DNA polymerase η opposite the T that results from deamination of the methylC ((m)C) within the CPD. Although the frequency of CPD formation and repair is modestly modulated by its rotational position within a nucleosome, the effect of position on the rate of (m)C deamination in a CPD has not been previously studied. We now report that deamination of a T(m)C CPD whose sugar phosphate backbone is positioned against the histone core surface decreases by a factor of 4.7, whereas that of a T(m)C CPD positioned away from the surface increases by a factor of 8.9 when compared with unbound DNA. Because the (m)Cs undergoing deamination are in similar steric environments, the difference in rate appears to be a consequence of a difference in the flexibility and compression of the two sites due to DNA bending. Considering that formation of the CPD positioned away from the surface is also enhanced by a factor of two, a T(m)CG site in this position might be expected to have up to an 84-fold higher probability of resulting in a UV-induced (m)C to T mutation than one positioned against the surface. These results indicate that rotational position may play an important role in the formation of UV-induced C to T mutation hotspots, as well as in the mutagenic mechanism of other DNA lesions." @default.
• W2009707610 created "2016-06-24" @default.
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• W2009707610 date "2011-02-01" @default.
• W2009707610 modified "2023-10-18" @default.
• W2009707610 title "Rotational Position of a 5-Methylcytosine-containing Cyclobutane Pyrimidine Dimer in a Nucleosome Greatly Affects Its Deamination Rate" @default.
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• W2009707610 doi "https://doi.org/10.1074/jbc.m110.183178" @default.
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