Splicing of the meiosis-specific HOP2 transcript utilizes a unique 5' splice site.
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.
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Department of Molecular, Cellular and Developmental Biology, Howard Hughes Medical Institute, Yale University, New Haven, Connecticut 06520-8103, USA.
Roeder
G S
GS
D020121:5' Untranslated Regions; D001483:Base Sequence; D001665:Binding Sites; D004271:DNA, Fungal; D005656:Fungal Proteins / Q000235:genetics* / Q000378:metabolism; D007438:Introns; D008540:Meiosis; D008969:Molecular Sequence Data; D016296:Mutagenesis; D011418:Prophase; D012322:RNA Precursors; D012326:RNA Splicing; D012331:RNA, Fungal / Q000378:metabolism*; D016601:RNA-Binding Proteins / Q000378:metabolism; D017411:Ribonucleoproteins, Small Nuclear; D012441:Saccharomyces cerevisiae / Q000235:genetics*; D029701:Saccharomyces cerevisiae Proteins; D014158:Transcription, Genetic
D020121:5' Untranslated Regions; D004271:DNA, Fungal; D005656:Fungal Proteins; C113830:HOP2 protein, S cerevisiae; C092601:MER1 protein, S cerevisiae; D012322:RNA Precursors; D012331:RNA, Fungal; D016601:RNA-Binding Proteins; D017411:Ribonucleoproteins, Small Nuclear; D029701:Saccharomyces cerevisiae Proteins; C075023:NAM8 protein, S cerevisiae