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Group I introns found in Chlorella viruses: biological implications
K Nishida1, S Suzuki, Y Kimura
1Department of Molecular Biotechnology, Graduate School of Engineering, Hiroshima University, Higashi-Hiroshima, Japan.
Virology
|March 26, 1998
Summary
Group I introns were found in Chlorella viruses in Japan, often within specific genes. These self-splicing introns showed high sequence identity within the same gene, suggesting conserved function.
Area of Science:
- Virology
- Molecular Biology
- Genetics
Background:
- Group I introns are mobile genetic elements found in various organisms.
- Chlorella viruses are large DNA viruses that infect green algae.
Purpose of the Study:
- To characterize group I introns in Chlorella viruses isolated from Japan.
- To investigate the insertion sites, biological activity, and sequence divergence of these introns.
Main Methods:
- Detection and characterization of group I introns in Chlorella viruses.
- Nucleotide sequence analysis and phylogenetic analysis of intron sequences.
Main Results:
- Over 80 group I introns were identified in Chlorella viruses, with an average frequency of 8.0%.
- Introns were primarily located in genes for transcriptional elongation factor TFIIS and URF 14.2, and occasionally in the Vp52 gene.
- Introns were biologically active (self-splicing) and showed high sequence identity within the same gene (>99%) but lower identity between different genes (72-78%).
- Phylogenetic analysis indicated a relationship between these introns and those found in rRNA genes of diverse eukaryotes.
Conclusions:
- Group I introns are prevalent in Chlorella viruses and exhibit conserved sequences within specific host genes.
- The findings suggest a potential role for these introns in viral evolution and their relationship to introns in other eukaryotic organisms.