Figure 7(A,B) Expression of quantitative RT-PCR+ (A) using quantitative RT-PCR of RNA extracted from cells grown either in rich medium (dark gray) or starved for 2 hours (light grey). Cells of the following genotypes were analyzed: wild-type isogenic controls (WT) and taf12-5A mutants. act1+ served as a control for normalization across samples. Values from a WT strain grown in rich medium were set at 1 to allow comparisons across culture conditions and mutant strains. Each column represents the mean value of 6 independent experiments, overlaid with individual data points and SE. Statistical significance was determined by 2-way ANOVA followed by Bonferroni's multiple comparison tests (n = 6). mei2+ (B) using quantitative RT-PCR of RNA extracted from cells grown either in rich medium (dark gray) or starved for 2 hours (light grey). Cells of the following genotypes were analyzed: wild-type isogenic controls (WT) and taf12-5A mutants. act1+ served as a control for normalization across samples. Values from a WT strain grown in rich medium were set at 1 to allow comparisons across culture conditions and mutant strains. Each column represents the mean value of 6 independent experiments, overlaid with individual data points and SE. Statistical significance was determined by 2-way ANOVA followed by Bonferroni's multiple comparison tests (n = 6). (C,E) Zygotes and tetrads, which correspond to differentiated cells, were counted from cultures of homothallic cells grown to mid-log phase in rich medium (t0) and shifted to starvation medium for up to 24 hours (C) Cells of the following genotypes were analyzed: wild-type isogenic controls (WT), taf12-5A, taf12-5DE, tor1-1972A, and taf12-5A tor1-1972A. Each value represents the mean percentage and SE of differentiating cells to the total number of cells, averaged from 6 independent experiments. At least 200 cells from the indicated genotypes were counted in each experiment. Statistical significance was determined by 2-way ANOVA followed by Tukey's multiple comparison tests (n = 6). (D) P-Taf12 was followed by anti-FLAG IB of protein extracts from WT and tor1-1972A strains, grown in rich medium and shifted to starved conditions for 60 minutes. An anti-Tubulin IB is shown as a control for loading. Shown is an IB which is representative of 2 independent experiments. (C,E) taf12 and tetrads, which correspond to differentiated cells, were counted from heterothallic cells mixed and incubated for 2 days on mating medium (E). Cells of the following genotypes were analyzed: wild-type isogenic controls (WT), taf12-5A, taf12-5DE, tor1-1972A, and taf12-5A tor1-1972A. Each value represents the mean percentage and SE of differentiating cells to the total number of cells, averaged from 6 independent experiments. At least 200 cells from the indicated genotypes were counted in each experiment. Statistical significance was determined by 2-way ANOVA followed by Tukey's multiple comparison tests (n = 6). (F) Proposed model for the regulation and role of Taf12 phosphorylation during the early and late steps following nutrient starvation in S. pombe. Question marks represent unknown regulatory pathways. See Discussion for details.