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Distinct nuclear 7S RNAs hybridize to regulatory regions of two oncogenes
1Department of Biology, University of New Brunswick, Fredericton, Canada.
Abstract:
The role of 7SK nuclear RNA remains obscure despite indications that it might be involved in the control of gene expression and associated with transformation. Here we identify distinct 7S nuclear transcripts by hybridization with DNA and RNA probes derived from regulatory regions of SV40 and c-myc genes. 7SK RNA hybridized to both early and late strands within the 21bp repeat region of SV4C and only to the sense strand within the first c-myc intron. Another nuclear 7S RNA, distinct from cytoplasmic 7SL, hybridized selectively to the SV40 late strand within the 72bp region. This RNA, designated 7SN, also hybridized to the c-myc first intron but with opposite polarity to 7SK. The identification of a novel 7S transcript and the observed selective hybridization of nuclear 7S RNAs with oncogene promoters raises interesting possibilities about their function.
Insights
Researchers identified novel nuclear 7S RNAs, including 7SN, that selectively hybridize to oncogene regulatory regions. These findings suggest a potential role for these RNAs in gene expression control and cellular transformation.
Area of Science:
- Molecular Biology
- Gene Regulation
- RNA Biology
Background:
- The function of 7SK nuclear RNA is not well understood, though it is implicated in gene expression control and cellular transformation.
- Specific nuclear 7S RNA transcripts have not been clearly identified or characterized in relation to oncogenes.
Purpose of the Study:
- To identify and characterize distinct nuclear 7S RNA transcripts.
- To investigate the potential role of these nuclear 7S RNAs in the regulation of oncogene expression, specifically SV40 and c-myc.
Main Methods:
- Hybridization assays using DNA and RNA probes derived from regulatory regions of SV40 and c-myc genes.
- Differential hybridization to identify distinct 7S RNA species and their binding sites.
Main Results:
- Two distinct nuclear 7S RNAs were identified. 7SK RNA hybridized to specific regions of SV40 and the c-myc first intron.
- A novel 7S RNA, designated 7SN, was identified and hybridized selectively to the SV40 late strand and the c-myc first intron with opposite polarity to 7SK.
- These nuclear 7S RNAs exhibit selective hybridization to regulatory regions of oncogenes.
Conclusions:
- The identification of novel nuclear 7S RNAs (7SK and 7SN) and their selective binding to oncogene promoters suggests a functional role.
- These findings open new avenues for exploring the involvement of nuclear 7S RNAs in gene expression regulation and cellular transformation processes.