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Isolation of a mouse genomic clone containing four tRNACys-encoding genes
L Wood1, N Hatzenbuhler, R Peterson
1Molecular Biology Research, Upjohn Company, Kalamazoo, MI 49007.
Gene
|February 15, 1991
Summary
Researchers identified a cluster of four cysteine transfer RNA (tRNA) genes in mice. Three genes are identical, but the fourth has sequence alterations affecting its structure and flanking regions.
Area of Science:
- Genetics
- Molecular Biology
- Genomics
Background:
- Transfer RNA (tRNA) molecules are essential for protein synthesis.
- Gene clusters can contain multiple copies of functionally related genes.
- Murine models are widely used to study mammalian gene regulation.
Purpose of the Study:
- To characterize a cluster of tRNACys-encoding genes in a murine genomic clone.
- To investigate sequence variations and structural implications within the tRNA gene cluster.
Main Methods:
- DNA sequencing of an 18-kb murine genomic insert.
- Analysis of nucleotide sequences and predicted secondary structures of four tRNACys genes.
- Comparison of flanking regions and identification of potential transcription termination signals.
Main Results:
- A cluster of four tRNACys genes (anticodon GCA) was identified.
- Three genes encode identical tRNA, while one gene exhibits altered nucleotide sequences.
- Sequence variations in the fourth gene affect tRNA stems, potentially weakening hydrogen bonds.
- All four genes possess a putative transcription termination signal.
- Flanking regions of the identical tRNAs are similar, but the fourth tRNA's flanking regions are distinct.
Conclusions:
- The identified tRNACys gene cluster displays both conserved and divergent elements.
- Sequence alterations in one gene may impact tRNA function or regulation.
- Differences in flanking regions suggest distinct regulatory mechanisms or evolutionary origins.