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- Title
Pol III binding in six mammals shows conservation among amino acid isotypes despite divergence among tRNA genes.
- Authors
Kutter, Claudia; Brown, Gordon D; Gonçalves, Ângela; Wilson, Michael D; Watt, Stephen; Brazma, Alvis; White, Robert J; Odom, Duncan T
- Abstract
RNA polymerase III (Pol III) transcription of tRNA genes is essential for generating the tRNA adaptor molecules that link genetic sequence and protein translation. By mapping Pol III occupancy genome-wide in mouse, rat, human, macaque, dog and opossum livers, we found that Pol III binding to individual tRNA genes varies substantially in strength and location. However, when we took into account tRNA redundancies by grouping Pol III occupancy into 46 anticodon isoacceptor families or 21 amino acid-based isotype classes, we discovered strong conservation. Similarly, Pol III occupancy of amino acid isotypes is almost invariant among transcriptionally and evolutionarily diverse tissues in mouse. Thus, synthesis of functional tRNA isotypes has been highly constrained, although the usage of individual tRNA genes has evolved rapidly.
- Subjects
RNA polymerases; TRANSCRIPTION factors; AMINO acids; TRANSFER RNA; GENETIC translation; ANIMAL genome mapping
- Publication
Nature Genetics, 2011, Vol 43, Issue 10, p948
- ISSN
1061-4036
- Publication type
Article
- DOI
10.1038/ng.906