Project description:The diploid isolate EM93 is the main ancestor to the widely used Saccharomyces cerevisiae haploid laboratory strain, S288C. In this study, we first hybridise DNA from eight EM93 segregants from two tetrads to Affymetrix genechip S. cerevisiae Tiling 1.0R Arrays to generate a high-resolution overview of the genetic differences between EM93 and S288C. We show that EM93 is heterozygous for many polymorphisms, including large sequence polymorphisms, such as deletions and a Saccharomyces paradoxus introgression. We also find that many of the large sequence polymorphisms are associated with Ty-elements and sub-telomeric regions. We next utilize the hybridization profiles of the 3.2 million Tiling Array probes to identify 2,965 genetic markers, which we then used to design an EM93 genotyping array. By genotyping 120 EM93 tetrads, we deduced the structures of all EM93 chromosomes and found that the average EM93 meiosis produces 144 detectable recombination events, consisting of 87 crossover and 57 non-crossover events; we also identified 203 recombination hot-spots and provide evidence for crossover interference. We find that the effect of heterozygous large sequence polymorphisms on recombination is chromosome position-dependent, with sub-telomeric large sequence polymorphisms having no discernable effect on recombination but non-sub-telomeric large sequence polymorphisms reducing recombination. Finally, we find that recombination hotspots show limited conservation, with some but not all strain-specific hotspots being due to heterozygous non-sub-telomeric large sequence polymorphisms.

2012-06-08 | E-MEXP-3246 | biostudies-arrayexpress

Saccharomyces cerevisiae strain:BY4742

Project description:Saccharomyces cerevisiae BY4742 genome sequencing

| PRJNA346640 | ENA

Saccharomyces cerevisiae S288C

Project description:Saccharomyces cerevisiae S288C Genome sequencing

| PRJNA428372 | ENA

Saccharomyces cerevisiae S288c

Project description:Saccharomyces cerevisiae S288c Genome sequencing

| PRJNA262175 | ENA

Saccharomyces cerevisiae S288C

Project description:Saccharomyces cerevisiae suppressor mutant sequencing