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Nucleic Acids Research, 1990, Vol. 18, No. 1 173-180
© 1990

MOLECULAR BIOLOGY

Nucleotide sequence of the mitochondrial genome of Paramecium

A.E. Pritchard, J.J. Seilhamer, R. Mahalingam, C.L. Sable, S.E. Venuti and D.J. Cummings*

Department of Microbiology and Immunology, University of Colorado Health Sciences Center Denver, CO 80262, USA

* To whom correspondence should be addressed

Received August 16, 1989. Accepted November 15, 1989.

The nucleotide sequence for 40,469 bp of the linear Paramecium aurelia mitochondrial (mt) genome is presented with the locations of the known genes, presumed ORFs, and their transcripts. Many of the genes commonly encoded in mt DNA of other organisms have been identified in the Paramecium mt genome but several unusual genes have been found. Ribosomal protein genes rps14, rps12, and rpl2 are clustered in a region that also contains two other genes usually found in chloroplasts, but rpl14 is over 16 kbp away. The ATP synthase gene, atp9, is encoded in this mt genome, but the atp6, atp8, and COIII genes have not been identified. All of the identified genes are transcribed. Many mono- and poly- cistronic transcripts have been detected which cover most of the genome, including large regions where genes have yet to be identified. Based on sequence comparisons with known tRNAs, only those for phe, trp, and tyr are encoded in Paramecium mt DNA.


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