NUCLEOTIDE-SEQUENCE AND PROMOTER ANALYSIS OF SPO13, A MEIOSIS-SPECIFIC GENE OF SACCHAROMYCES-CEREVISIAE

The SPO13 gene, required for meiosis I segregation in Saccharomyces cerevisiae, produces two developmentally regulated transcripts (1.0 and 1.4 kilobases) that differ in length at their 5' ends. The shorter transcript is sufficient to complement the spo13-1 mutation and contains a major open reading frame encoding a highly basic protein of 33.4 kilodaltons. A fragment upstream (-170 to -8) of the open reading frame confers meiosis-specific transcription on a spo13-HIS3 fusion. Deletions at the 5' end of spo13-lacZ fusions define a region between -140 and -80 that is essential for meiosis-specific expression. This region acts in an orientation-independent manner and is responsive to the MAT-RME regulatory cascade. It contains a 10-base-pair sequence, TAGCCGCCGA, found in a number of meiosis-specific genes, that appears to be required for SPO13 expression. This sequence is identical to URS1, a ubiquitous mitotic repressor element.