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Published on: December 2, 2009
Molecular hybridization between rat liver deoxyribonucleic acid and complementary ribonucleic acid
The Biochemical Journal
|November 1, 1970
Summary
Sonication reduces rat liver DNA's ability to hybridize with synthesized RNA (cRNA) due to smaller DNA fragment size, not cross-linking. Most reiterated DNA hybridizes with cRNA, but highly reiterated components are poorly transcribed in vitro.
Area of Science:
- Molecular Biology
- Genetics
- Biochemistry
Background:
- In vitro synthesized RNA (cRNA) can hybridize with DNA.
- Understanding DNA-RNA hybridization is crucial for studying gene expression and genome organization.
Purpose of the Study:
- To investigate the effect of DNA sonication on its hybridization capacity with cRNA.
- To characterize the renaturation kinetics and hybridization components of rat liver DNA.
Main Methods:
- In vitro synthesis of cRNA using rat liver DNA as a template.
- Nitrocellulose filter method for studying DNA-RNA hybridization.
- DNA sonication to alter molecular weight.
- Spectrophotometric measurement of DNA renaturation at 260nm.
Main Results:
- Sonication reduced DNA hybridization capacity by approximately 50%, attributed to decreased DNA molecular weight, not cross-linking.
- Hybridization saturation with cRNA revealed two components, corresponding to two renaturation components in rat liver DNA.
- High cRNA concentrations (250 µg/ml) hybridized most of the reiterated DNA fraction, but slowly renaturing DNA showed minimal hybridization.
Conclusions:
- The size of DNA fragments significantly impacts their hybridization efficiency with cRNA.
- Rat liver DNA contains at least two distinct reiterated components with different renaturation and hybridization properties.
- The most highly reiterated DNA component appears to be poorly transcribed in vitro under the tested conditions.
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