Coadaptation of isoacceptor tRNA genes and codon usage bias for translation efficiency in Aedes aegypti and Anopheles gambiae
Autor(es): Behura, S. K.; Severson, D. W.
Resumo: The transfer RNAs (tRNAs) are essential components of translational machinery. We determined that tRNA isoacceptors (tRNAs with different anticodons but incorporating the same amino acid in protein synthesis) show differential copy number abundance, genomic distribution patterns and sequence evolution between Aedes aegypti and Anopheles gambiae mosquitoes. The tRNA-Ala genes are present in unusually high copy number in the Ae. aegypti genome but not in An. gambiae. Many of the tRNA-Ala genes of Ae. aegypti are flanked by a highly conserved sequence that is not observed in An. gambiae. The relative abundance of tRNA isoacceptor genes is correlated with preferred (or optimal) and nonpreferred (or rare) codons for similar to 2-4% of the predicted protein coding genes in both species. The majority (similar to 74-85%) of these genes are related to pathways involved with translation, energy metabolism and carbohydrate metabolism. Our results suggest that these genes and the related pathways may be under translational selection in these mosquitoes.
Palavras-Chave: Gene cluster; Sequence divergence; Anticodon; Selection; Metabolic pathway
Imprenta: Insect Molecular Biology, v. 20, n. 2, p. 177-187, 2011
Identificador do objeto digital: 10.1111/j.1365-2583.2010.01055.x
Descritores: Aedes aegypti - DNA ; Aedes aegypti - Genome ; Aedes aegypti - Protein synthesis ; Aedes aegypti - RNA
Data de publicação: 2011
