McCready S and Cox B (1993)

Abstract

We have developed a dot blot immunoassay for UV photoproducts which distinguishes 6-4 photoproducts from cyclobutane dimers. The assay uses a polyclonal antiserum that is specific for UV-irradiated DNA. Cyclobutane dimers are measured in DNA samples which have been treated with hot alkali to destroy 6-4 photoproducts. 6-4 Photoproducts are measured using blots that have been incubated in photoreactivating enzyme to eliminate cyclobutane dimers. A combination of the two treatments leaves no detectable antigenic lesions. Wild-type S. cerevisiae repairs 6-4 photoproducts, in the genome overall, more rapidly than cyclobutane dimers. The most sensitive alleles of rad1, rad2, rad3 and rad4 are completely unable to repair either kind of photoproduct. We conclude that 6-4 photoproducts are repaired by essentially the same mechanism as are cyclobutane dimers.

PMID: 7679473
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Reference Type: Journal Article | Research Support, Non-U.S. Gov't
Authors: McCready S, Cox B
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