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. 1989 Apr 11;17(7):2675–2691. doi: 10.1093/nar/17.7.2675

The degree of ultraviolet light damage to DNA containing iododeoxyuridine or bromodeoxyuridine is dependent on the DNA sequence.

V Murray 1, R F Martin 1
PMCID: PMC317650  PMID: 2717406

Abstract

The sequence selectivity of 300 nm ultraviolet light damage to DNA containing bromodeoxyuridine or iododeoxyuridine was examined on DNA sequencing gels. This was accomplished using a system where an M13 template was employed to direct synthesis of DNA in which thymidine was fully substituted with bromodeoxyuridine or iododeoxyuridine. The sites of damage corresponded to the positions of analogue incorporation. The extent of damage varied considerably at different sites of cleavage and ranged from the undetectable to over fifteen times the limit of detection (as assessed by laser densitometer scans). Strong damage sites had the "consensus" sequence CTT while sites of no detectable damage had the "consensus" sequence GTR. Bromodeoxyuridine and iododeoxyuridine had the same sites of damage although the extent of damage varied at different sites and bromodeoxyuridine damage was slightly greater than iododeoxyuridine. DNA containing thymidine was not damaged to any detectable level in this system with 300 nm ultraviolet light. The use of three closely related DNA sequences as targets for damage confirmed that (1) the sites of analogue incorporation are the cause of ultraviolet damage; and (2) that the neighbouring DNA sequence is an important parameter in determining the extent of damage. It is proposed that the microstructure of DNA--in particular the distance between the 5-carbon of the pyrimidine base (which is attached to the halogen) and hydrogen on the 2' carbon of the 5'-deoxyribose--ultimately determines the degree of cleavage with large distances giving a small degree of damage and smaller distances a large degree of damage.

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Selected References

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