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Nucleic Acids Research, 1994, Vol. 22, No. 9 1696-1700
© 1994

RNA

Mitochondrial transcripts are processed but are not edited normally in Trypanosoma equiperdum (ATCC 30019) which has kDNA sequence deletion and duplication

Hsiao-Hsueh Shu and Kenneth Stuart1,*

Seattle Biomedical Research Institute 4 Nickerson Street, Seattle, WA 98109 1Pathobiology Department, University of Washington SC-38, Seattle, WA 98195, USA

*To whom correspondence should be addressed

Received December 21, 1993. Revised March 28, 1994. Accepted March 28, 1994.

Analyses of the Trypanosoma equiperdum (ATCC 30019) maxicircle reveals deletions, duplications and rearrangement compared to T.brucei. The genes for 9S rRNA and 12 proteins are absent. The 12S rRNA and cytochrome oxidase subunit I (COI) genes lack their 3' ends and are adjacent indicating deletion of intervening genes. The remaining two NADH dehydrogenase subunit genes (ND4 and ND5), the ribosomal protein RPS12 gene and the CR5 gene are duplicated and rearranged. ND4, RPS12 and the CR4 transcripts are abundant in steady state RNA while 12S rRNA and COI transcripts are not detected. Full length ND5 transcripts are rare, if present, but chimeric ND5/ND4 transcripts are abundant. The CR4 and RPS12 transcripts are the size of unedited RNAs suggesting that they are processed. However, they are not edited normally, presumably due to the absence of minicircle gRNA genes.


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