Figure 2

Organization of tRNA genes in T. brucei. The 66 tRNA genes, distributed into 23 loci, are indicated in orange. The predicted anticodons are shown in parentheses. snRNA and 7SL genes are shown in purple and gray, respectively. The sRNA76 (misannotated in GeneDB as a tRNA-Sec gene) is shown as a stripped box in locus chr04-V. The two tRNA-Sec genes that we found are located in loci chr09-II, III (at positions 505,606 to 505,693 and 509,443 to 509,530 of chromosome 9). The gene from locus chr09-II overlaps a putative Pol II gene (Tb09.160.1080, dotted blue box), annotated as hypothetical protein (unlikely). Also, the tRNA-Gly from locus chr09-I overlaps a putative Pol II gene (Tb09.211.4080, dotted blue box), annotated as hypothetical protein (unlikely). The U5 snRNA gene (locus chr10-II) also overlaps a Pol II gene (Tb10.6k15.2990, sequence orphan), but located on the opposite strand. Genes are drawn to scale, and the sizes of intergenic regions are indicated (in base pairs). Protein-coding genes that flank Pol III-transcribed genes are shown in blue (not to scale). In locus chr08-V, the Leu-TAA gene (Tb_08_TRNA_Leu_2) and the first Gln-CTG gene (Tb_08_TRNA_Gln_2) are annotated in the wrong (opposite) strand in GeneDB. Maps of an incomplete repertoire of tRNA genes from T. brucei were previously reported [16].