Unknown,Transcriptomics,Genomics,Proteomics

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Transcriptional remodeling in response to transfer upon carbon-limited or metformin-supplemented media in S. cerevisiae and its effect on chronological life span

ABSTRACT: The genome-wide transcriptional response of S. cerevisiae cells upon transfer to carbon-limited or metformin supplemented media is investigated. DHO strain (BY4742 background) was cultivated batch-wise in SDC media at 30C and 180 rpm up to mid-exponential phase (OD600 ~ 0.6). The cells of the main culture were divided in three aliquots at the mid-exponential phase, centrifuged at 6000 rpm for 5 min, washed twice with deionized and distilled sterile water prior to their transfer to the treatment media. Treatment media comprised of fresh SDC (2% glucose) for the control case, SDC + 0.25% glucose for the C-lim case and SDC + 1.66% metformin for the Met case. Samples collection for transcriptional profiling was done at the 2nd hour of the transfer. The experiments were carried out in biological triplicates.

INSTRUMENT(S): Affymetrix, QuiaCube

ORGANISM(S): Saccharomyces cerevisiae

SUBMITTER: Esra Yucel

PROVIDER: E-MTAB-3001 | biostudies-arrayexpress |

REPOSITORIES: biostudies-arrayexpress

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Project description:In many species, a dosage compensation complex (DCC) is targeted to X chromosomes of one sex to equalize levels of X gene products between males (1X) and females (2X). Here we identify cis-acting regulatory elements that target the C. elegans X chromosome for repression by the DCC. The DCC binds to discrete, dispersed sites on X of two types. rex sites recruit the DCC in an autonomous, DNA sequence-dependent manner using a 12 bp consensus motif that is enriched on X. This motif is critical for DCC binding, is clustered in rex sites, and confers much of X-chromosome specificity. Motif variants enriched on X by 3.8-fold or more are highly predictive (95%) for rex sites. In contrast, dox sites lack the X-enriched variants and cannot bind the DCC when detached from X. dox sites are more prevalent than rex sites and, unlike rex sites, reside preferentially in promoters of some expressed genes. These findings fulfill predictions for a targeting model in which the DCC binds to recruitment sites on X and disperses to discrete sites lacking autonomous recruitment ability. To relate DCC binding to function, we identified dosage-compensated and non-compensated genes on X. Unexpectedly, many genes of both types have bound DCC, but many do not, suggesting the DCC acts over long distances to repress X gene expression. Remarkably, the DCC binds to autosomes, but at far fewer sites and rarely at consensus motifs. DCC disruption causes opposite effects on expression of X and autosomal genes. The DCC thus acts at a distance to impact expression throughout the genome. Experiment Overall Design: For microarray analysis, the nematode strains and number of experiments was as follows: TY2222, her-1(hv1y101); xol-1(y9) sdc-2(y74) unc-9(e101), XO embryos (8 biological replicas and 6 wild-type XX embryos controls ), dpy-27(y57) XX embryos (3 biological replicas and 3 wild-type XX embryos controls), and sdc-2(y93, RNAi) XX embryos (3 biological replicas and 3 wild-type XX embryos controls).

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Transcriptional remodeling in response to transfer upon carbon-limited or metformin-supplemented media in S. cerevisiae and its effect on chronological life span

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