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Molecular and Cellular Biology, December 1999, p. 7933-7943, Vol. 19, No. 12
0270-7306/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.

Splicing of the Meiosis-Specific HOP2 Transcript Utilizes a Unique 5' Splice Site

Jun-Yi Leu1 and G. Shirleen Roeder1,2,*

Department of Molecular, Cellular and Developmental Biology,1 and Department of Genetics, Howard Hughes Medical Institute,2 Yale University, New Haven, Connecticut 06520-8103.

Received 25 June 1999/Returned for modification 29 July 1999/Accepted 30 August 1999

The Saccharomyces cerevisiae HOP2 gene is required to prevent formation of synaptonemal complex between nonhomologous chromosomes during meiosis. The HOP2 gene is expressed specifically in meiotic cells, with the transcript reaching maximum abundance early in meiotic prophase. The HOP2 coding region is interrupted by an intron located near the 5' end of the gene. This intron contains a nonconsensus 5' splice site (GUUAAGU) that differs from the consensus 5' splice signal (GUAPyGU) by the insertion of a nucleotide and by a single nucleotide substitution. Bases flanking the HOP2 5' splice site have the potential to pair with sequences in U1 small nuclear RNA, and mutations disrupting this pairing reduce splicing efficiency. HOP2 pre-mRNA is spliced efficiently in the absence of the Mer1 and Nam8 proteins, which are required for splicing the transcripts of two other meiosis-specific genes.

* Corresponding author. Mailing address: Howard Hughes Medical Institute, Department of Molecular, Cellular & Developmental Biology, Yale University, P.O. Box 208103, New Haven, CT 06520-8103. Phone: (203) 432-3501. Fax: (203) 432-3263. E-mail: shirleen.roeder{at}yale.edu.

Molecular and Cellular Biology, December 1999, p. 7933-7943, Vol. 19, No. 12
0270-7306/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.


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