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Nucleotide changes in mitochondrial 16S rRNA gene from different mammalian cell lines
1Laboratory of Molecular Genetics, Kyoto University of Education, Japan.
Genes & Genetic Systems
|March 23, 1999
Summary
Mitochondrial 16S rRNA gene mutations were analyzed in rodent cell lines. Specific mutations were identified in Chinese hamster and mouse cells, outside the chloramphenicol target domain.
Area of Science:
- Molecular Biology
- Genetics
- Mitochondrial DNA Analysis
Background:
- Mitochondrial 16S rRNA gene is crucial for mitochondrial protein synthesis.
- Chloramphenicol targets the peptidyl transferase domain of this gene.
- Understanding mutations in this region is important for studying drug resistance and cellular processes.
Purpose of the Study:
- To analyze partial nucleotide sequences of the mitochondrial 16S rRNA gene in five rodent cell lines.
- To identify the mutation spectrum within this gene.
- To investigate mutations in relation to chloramphenicol resistance.
Main Methods:
- DNA isolation from Chinese hamster (V79, CHO-K1) and murine (Balb Y SV, PCC4 AG Cap) cell lines.
- Polymerase chain reaction (PCR) amplification of 3' terminal regions of the 16S rRNA gene.
- Direct sequencing of amplified gene regions.
Main Results:
- Observed C to T transition in CHO-K1 cells and A deletion in multiple cell lines relative to V79.
- Identified a G to A transition mutation in heteroplasmic state in chloramphenicol-resistant PCC4 AG Cap mouse cells.
- No mutations detected in Balb Y SV cells relative to L-cell sequence.
- All identified mutation sites were located outside the peptidyl transferase domain.
Conclusions:
- Specific mutations in the mitochondrial 16S rRNA gene were identified in different rodent cell lines.
- These mutations occurred outside the chloramphenicol-binding peptidyl transferase domain.
- The findings contribute to understanding mitochondrial genetics and potential mechanisms of drug resistance.