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RNA target loss during solid phase hybridization of body fluids--a quantitative study.
H A Rotbart1, M J Levin, N L Murphy
1Department of Pediatrics, University of Colorado School of Medicine, Denver 80262.
Molecular and Cellular Probes
|December 1, 1987
Summary
RNase activity in body fluids degrades viral RNA, limiting sensitive viral infection diagnosis. Adding RNase inhibitors to specimens immediately after collection is crucial for preserving intact virions and improving detection accuracy.
Area of Science:
- Molecular Biology
- Virology
- Diagnostic Assays
Background:
- Nucleic acid hybridization assays for viral diagnosis face sensitivity limitations.
- Single-stranded RNA viruses are particularly vulnerable to degradation by RNase activity in body fluids.
Purpose of the Study:
- To investigate the impact of RNase activity on the sensitivity of viral RNA detection in body fluids.
- To identify strategies for preserving viral RNA integrity during diagnostic procedures.
Main Methods:
- Radioactively labeled enteroviral RNA was added to body fluids to assess degradation.
- RNase activity was characterized regarding speed, concentration, and potency.
- The efficacy of RNase inhibitors and the stability of RNA within virions were evaluated.
Main Results:
- Significant loss of target RNA was observed due to potent, rapidly acting RNase activity in body fluids.
- RNA breakdown products were too small for retention by standard membrane filters.
- RNase activity was inhibited by pre-treatment of body fluids with inhibitors.
- RNA within intact virions showed greater retention during hybridization procedures.
Conclusions:
- Detection of single-stranded RNA viruses relies on the quantity of intact virions in specimens.
- Immediate addition of RNase inhibitors to body fluid specimens is essential to prevent RNA loss from disrupted virions during transport and handling.