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Intracellular localization and unique conserved sequences of three small nucleolar RNAs
N Selvamurugan1, O H Joost, E S Haas
1Department of Pathology, St Louis University School of Medicine, St Louis, MO 63104-1028, USA.
Nucleic Acids Research
|April 15, 1997
Summary
Three small nucleolar RNAs (snoRNAs) from humans and frogs were found to migrate to the nucleus and nucleolus. Their conserved sequences contain signals for nuclear and nucleolar localization.
Area of Science:
- Molecular Biology
- Genetics
- Cell Biology
Background:
- Three human small nucleolar RNAs (snoRNAs), E1, E2, and E3, are encoded in introns of protein genes.
- These snoRNAs interact with specific segments of pre-ribosomal RNA (pre-rRNA) in vivo.
Purpose of the Study:
- To investigate the nucleolar and nuclear localization signals of human and frog E1, E2, and E3 snoRNAs.
- To analyze the evolutionary conservation and secondary structures of vertebrate snoRNAs.
Main Methods:
- Microinjection of human and frog snoRNAs into the cytoplasm of frog oocytes.
- Sequencing of snoRNA homologs from various vertebrates.
- Development of RNA secondary structure models.
Main Results:
- Injected snoRNAs localized specifically to the nucleus and nucleolus in frog oocytes.
- Evolutionarily conserved segments of the snoRNAs contain nuclear and nucleolar localization signals.
- Phylogenetic analysis revealed unique and conserved sequences across vertebrate snoRNAs.
Conclusions:
- The nucleolar and nuclear localization signals of E1, E2, and E3 snoRNAs are located within their conserved regions.
- Comparative sequence analysis aids in understanding snoRNA structure and function across species.