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Nucleic Acids Research, 1988, Vol. 16, No. 13 5827-5840
© 1988

Articles

The human U snRNA promoter and enhancer do not direct synthesis of messenger RNA

James E. Dahlberg and Elaine T. Schenborn+

Department of Physiological Chemistry, University of Wisconsin-Madison Madison, WI 53706, USA +Current address: Promega, 2800 Fish Hatchery Road Madison. WI 53711-5305

*To whom correspondence should be addressed

Received March 29, 1988. Accepted June 1, 1988.

We examined the ability of the 5' flanking region sequences of a human U RNA gene to direct synthesis of functional mRNA. When fused to chloramphenicol acetyltransferase (CAT) coding region sequences, the upstream sequences of the U gene were able to stimulate the synthesis of functional CAT mRNA in 293 cells but not in HeLa cells. Most of the polyadenylated CAT mRNA in 293 cells originated from cryptic promoters in the upstream U sequences, but nearly all of the CAT-specific RNA originating at position +1 (relative to the U gene promoter) was non-polyadenylated; this confirmed that the bona-fide U gene promoter was unable to direct efficient synthesis of poly-A+ mRNA. Our results demonstrate that the snRNA gene promoter and enhancer elements, although very efficient in transcription of snRNAs. are unable to direct transcription of polyadenylated mRNAs. However, other sequences in the 5' flanking region of the human U gene can activate transcription of functional mRNA, with 5' ends upstream of the normal transcription start site.


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