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Nucleic Acids Research, 1994, Vol. 22, No. 2 214-221
© 1994

MOLECULAR BIOLOGY

Characterization of transcription initiation, translation initiation, and poly(A) addition sites in the gene-sized macronuclear DNA molecules of Euplotes

Susmita Ghosh, John W. Jaraczewski1, Lawrence A. Klobutcher* and Carolyn L. Jahn1

Department of Biochemistry, University of Connecticut Health Center Farmington, CT 06030 1Department of Cell, Molecular, and Structural Biology, Northwestern University Medical School Chicago, IL 60611, USA

*To whom correspondence should be addressed

Received September 15, 1993. Accepted November 30, 1993.

The DNA In the transcriptionally active macronucleus of the hypotrlchous dilate Euplotes crassus exists as short, linear molecules with each molecule encoding a single genetic function. Previous work has indicated that coding regions occupy the majority of macronuclear DNA molecules. In the present study we have defined the transcription initiation sites and poly(A) addition sites for a number of different macronuclear genes In Euplotes crassus. Our results indicate that mature transcripts represent all but -100-200 bases of the non-telomerlc sequences in macronuclear DNA molecules. We have also examined the sequences In the vicinity of transcription start sites, poly(A) addition sites, and translation Initiation sites for Euplotes species genes In an attempt to define the cls-acting elements that control these processes. Our results Indicate that some of the common sequence elements known to control these processes In higher eukaryotes are likely not utilized by Euplotes genes. The data do indicate the presence of other conserved sequences both preceding and at the site of poly(A) addition, as well as at the site of translation initiation. These conserved sequences may serve an analogous role in these organisms. Finally, we have found that most macronuclear DNA molecules have transcription initiation sites within 30 bp of the telomere, suggesting that the telomere may play a role in promoting transcription.


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