Cyclin B-cdk activity stimulates meiotic rereplication in budding yeast.
Haploidization of gametes during meiosis requires a single round of premeiotic DNA replication (meiS) followed by two successive nuclear divisions. This study demonstrates that ectopic activation of cyclin B/cyclin-dependent kinase in budding yeast recruits up to 30% of meiotic cells to execute one to three additional rounds of meiS. Rereplication occurs prior to the meiotic nuclear divisions, indicating that this process is different from the postmeiotic mitoses observed in other fungi. The cells with overreplicated DNA produced asci containing up to 20 spores that were viable and haploid and demonstrated Mendelian marker segregation. Genetic tests indicated that these cells executed the meiosis I reductional division and possessed a spindle checkpoint. Finally, interfering with normal synaptonemal complex formation or recombination increased the efficiency of rereplication. These studies indicate that the block to rereplication is very different in meiotic and mitotic cells and suggest a negative role for the recombination machinery in allowing rereplication. Moreover, the production of haploids, regardless of the genome content, suggests that the cell counts replication cycles, not chromosomes, in determining the number of nuclear divisions to execute.
Strich
Randy
R
Institute for Cancer Research, Fox Chase Cancer Center, Philadelphia, Pennsylvania 19111, USA. randy.strich@fccc.edu
Mallory
Michael J
MJ
Jarnik
Michal
M
Cooper
Katrina F
KF
D019926:Cyclin B / Q000235:genetics*; D018844:Cyclin-Dependent Kinases / Q000235:genetics*; D016213:Cyclins / Q000235:genetics; D004261:DNA Replication / Q000235:genetics*; D004271:DNA, Fungal / Q000235:genetics; D005822:Genetic Vectors; D008540:Meiosis / Q000235:genetics*; D016133:Polymerase Chain Reaction; D011494:Protein Kinases / Q000235:genetics; D011995:Recombination, Genetic; D012441:Saccharomyces cerevisiae / Q000201:enzymology / Q000235:genetics*; D029701:Saccharomyces cerevisiae Proteins / Q000235:genetics
C068264:CLB1 protein, S cerevisiae; D019926:Cyclin B; D016213:Cyclins; D004271:DNA, Fungal; D029701:Saccharomyces cerevisiae Proteins; D011494:Protein Kinases; D018844:Cyclin-Dependent Kinases