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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Rodrigues, N. R. Campbell, R. D. Cotton, R. G. |
| Description | Author Affiliation: Cotton RG ( Department of Biochemistry, University of Oxford, United Kingdom.); |
| Abstract | The chemical reactivity of thymine (T), when mismatched with the bases cytosine, guanine, and thymine, and of cytosine (C), when mismatched with thymine, adenine, and cytosine, has been examined. Heteroduplex DNAs containing such mismatched base pairs were first incubated with osmium tetroxide (for T and C mismatches) or hydroxylamine (for C mismatches) and then incubated with piperidine to cleave the DNA at the modified mismatched base. This cleavage was studied with an internally labeled strand containing the mismatched T or C, such that DNA cleavage and thus reactivity could be detected by gel electrophoresis. Cleavage at a total of 13 T and 21 C mismatches isolated (by at least three properly paired bases on both sides) single-base-pair mismatches was identified. All T or C mismatches studied were cleaved. By using end-labeled DNA probes containing T or C single-base-pair mismatches and conditions for limited cleavage, we were able to show that cleavage was at the base predicted by sequence analysis and that mismatches in a length of DNA could be readily detected by such an approach. This procedure may enable detection of all single-base-pair mismatches by use of sense and antisense probes and thus may be used to identify the mutated base and its position in a heteroduplex. |
| ISSN | 00278424 |
| e-ISSN | 10916490 |
| Journal | Proceedings of the National Academy of Sciences of the United States of America |
| Issue Number | 12 |
| Volume Number | 85 |
| Language | English |
| Publisher | National Academy of Sciences |
| Publisher Date | 1988-07-01 |
| Publisher Place | United States |
| Access Restriction | Open |
| Subject Keyword | Base Composition Cytosine DNA Genetics Hydroxylamines Pharmacology Mutation Osmium Tetroxide Osmium Thymine Cloning, Molecular Drug Effects Genes Hydroxylamine Nucleic Acid Heteroduplexes Plasmids Steroid 21-Hydroxylase Research Support, Non-U.S. Gov't Multidisciplinary |
| Content Type | Text |
| Resource Type | Article |
| Subject | Multidisciplinary |
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