We commonly think of chemical mutation as a set of DNA adducts which are either premutagenic lesions, inducers of cellular response systems, or both. We propose to develop a general technology to test this proposition. We intend to map the position, count the number and, ultimately, identify the chemical structure of sequence specific DNA adducts formed in experiments in which mutation is also studied as a function of DNA sequence. Our strategy is to first separate adducted DNA sequences by denaturing gradient gel electrophoresis. Secondly, we propose to identify the position of adducted DNA sequences on the gel by DNA amplification of individual gel slices. Finally, we propose to map the positions of the adducts in the identified DNA sequences by use of DNA polymerase or exonuclease blocking or, in some cases, by mapping mutations arising during DNA amplification. We propose to focus on the mutagens MNNG and H2O2 to support the efforts of our Program collaborators in the study of alkylating and oxidizing agent induced mutation and because the expected adducts from these chemicals will challenge our analytical capability. In particular, we propose to perform an input-output analysis, adduct spectra map and mutation spectra map, for MNNG and H2O2 in diploid human cells. If we can reach these goals, we further propose to develop appropriate technology to provide sufficient site specific DNA adduct material for direct study by mass spectrometry which we estimate to be 1012to1013 molecules.

Agency
National Institute of Health (NIH)
Institute
National Institute of Environmental Health Sciences (NIEHS)
Type
Research Program Projects (P01)
Project #
5P01ES003926-09
Application #
3777161
Study Section
Project Start
Project End
Budget Start
Budget End
Support Year
9
Fiscal Year
1993
Total Cost
Indirect Cost
Name
Massachusetts Institute of Technology
Department
Type
DUNS #
City
Cambridge
State
MA
Country
United States
Zip Code
02139
Memisoglu, A; Samson, L (2000) Contribution of base excision repair, nucleotide excision repair, and DNA recombination to alkylation resistance of the fission yeast Schizosaccharomyces pombe. J Bacteriol 182:2104-12
Wyatt, M D; Samson, L D (2000) Influence of DNA structure on hypoxanthine and 1,N(6)-ethenoadenine removal by murine 3-methyladenine DNA glycosylase. Carcinogenesis 21:901-8
Opperman, T; Murli, S; Smith, B T et al. (1999) A model for a umuDC-dependent prokaryotic DNA damage checkpoint. Proc Natl Acad Sci U S A 96:9218-23
Hickman, M J; Samson, L D (1999) Role of DNA mismatch repair and p53 in signaling induction of apoptosis by alkylating agents. Proc Natl Acad Sci U S A 96:10764-9
Li-Sucholeiki, X C; Khrapko, K; Andre, P C et al. (1999) Applications of constant denaturant capillary electrophoresis/high-fidelity polymerase chain reaction to human genetic analysis. Electrophoresis 20:1224-32
Bennett, R A (1999) The Saccharomyces cerevisiae ETH1 gene, an inducible homolog of exonuclease III that provides resistance to DNA-damaging agents and limits spontaneous mutagenesis. Mol Cell Biol 19:1800-9
Ekstrom, P O; Borresen-Dale, A L; Qvist, H et al. (1999) Detection of low-frequency mutations in exon 8 of the TP53 gene by constant denaturant capillary electrophoresis (CDCE). Biotechniques 27:128-34
Glassner, B J; Posnick, L M; Samson, L D (1998) The influence of DNA glycosylases on spontaneous mutation. Mutat Res 400:33-44
Glassner, B J; Rasmussen, L J; Najarian, M T et al. (1998) Generation of a strong mutator phenotype in yeast by imbalanced base excision repair. Proc Natl Acad Sci U S A 95:9997-10002
Masuda, Y; Bennett, R A; Demple, B (1998) Dynamics of the interaction of human apurinic endonuclease (Ape1) with its substrate and product. J Biol Chem 273:30352-9

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