Immunoprecipitation of Pyrimidine(6-4)pyrimidone Photoproducts and Cyclobutane Pyrimidine Dimers in uv-Irradiated DNA
Abstract
Biological studies suggest that a significant proportion of the cytotoxicity observed in mammalian cells after uv irradiation may be due to damage other than cyclobutane dimers in DNA. Although pyrimidine-pyrimidone (6-4) photoproducts have been implicated as major contributors to cell lethality, their induction has been measured at considerably less than cyclobutane pyrimidine dimers when measured by chromatographic techniques. Because the yield of (6-4) photoproducts may be reduced by their lability to extreme heat and pH, we have advised an alternative, immunological quantification which does not require DNA hydrolysis. Affinity-purified rabbit antisera were used to precipitate low molecular weight 32P-labeled PM2 DNA irradiated with increasing fluences of uv light. DNA of known molecular weight was used to determine rates of induction for antibody-binding sites associated with (6-4) photoproducts and cyclobutane dimers. These rates were calculated to be 0.6 (6-4) photoproducts and 1.2 cyclobutane dimers/10(8) Da/J/m2. At low uv fluences (6-4) photoproducts were induced at one-half the rate of cyclobutane dimers, whereas at higher fluences (6-4) photoproducts predominated.
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The ratio between CPD and 6-4PP yields after UVB irradiation is between 3 and 5.
“The values reported range between 3 and 5 (53,55,59).”
From Photoinduced Damage to Cellular DNA: Direct and Photosensitized Reactions<sup>†</sup> (2012) · cites this paper as [59]
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- Authors
- Mitchell, D. L., Allison, J. P., & Nairn, R. S.
- Affiliations
- The University of Texas MD Anderson Cancer Center (US)
- ORCID
- Allison, James P.
- Venue
- Radiation Research
- Publisher
- JSTOR
- Published
- 1990-09
- Volume
- 123
- Issue
- 3
- Pages
- 299
- ISSN
- 0033-7587 (ISSN-L)
- OpenAlex
- W2057906697
- Cited by
- 32
- References
- 7
- Citations by year
- 2024: 1 · 2021: 1 · 2020: 1 · 2018: 1 · 2017: 1 · 2016: 2 · 2015: 1 · 2014: 1 · 2012: 1
- FWCI
- 1.00
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Radiation Research (publishedVersion)
- PubMed (publishedVersion)
- Funders
- National Cancer Institute (CA36361)
- Topics
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › DNA Repair Mechanisms
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Cancer Research › Carcinogens and Genotoxicity Assessment
- Health Sciences › Medicine › Radiology, Nuclear Medicine and Imaging › Effects of Radiation Exposure
- Keywords
- cyclobutane pyrimidine dimers, UV irradiation, DNA damage, immunoprecipitation, antibody binding, cytotoxicity, DNA repair
- MeSH terms
- Animals, DNA, DNA Damage, Precipitin Tests, Pyrimidine Dimers, Rabbits, Ultraviolet Rays
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