Dataset Information

Yeast Bdf1 interactome - Bdf1 Bromodomains are Essential for Meiosis and the Expression of Meiotic-Specific Genes

ABSTRACT: Bromodomain and Extra-terminal motif (BET) proteins play a central role in transcription regulation and chromatin signalling pathways. In yeast, Bdf1 and its homologous protein Bdf2 are partially redundant and the deletion of both genes is lethal. Most of Bdf1 functions have been investigated in vegetative cells even if this protein is essential for sporulation. In this study, we explored for the first time the functional role of the Bdf1 bromodomains during the sporulation program. Extensive purification of Bdf1 partners identified two independent complexes with Bdf2 or the Swr1 complex. However, none of them are required for meiotic gene regulation or to complete sporulation. Taken together, our results unveil a new role for Bdf1 as a meiotic-specific gene transcriptional regulator independently of its predominant protein partners.

OTHER RELATED OMICS DATASETS IN: PRJNA352473

INSTRUMENT(S): LTQ Orbitrap Velos, Q Exactive

ORGANISM(S): Saccharomyces Cerevisiae (baker's Yeast)

SUBMITTER: Yohann Couté

LAB HEAD: Bruley

PROVIDER: PXD005227 | Pride | 2017-01-11

REPOSITORIES: Pride

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Publications

Bdf1 Bromodomains Are Essential for Meiosis and the Expression of Meiotic-Specific Genes.

García-Oliver Encar E Ramus Claire C Perot Jonathan J Arlotto Marie M Champleboux Morgane M Mietton Flore F Battail Christophe C Boland Anne A Deleuze Jean-François JF Ferro Myriam M Couté Yohann Y Govin Jérôme J

PLoS genetics 20170109 1

Bromodomain and Extra-terminal motif (BET) proteins play a central role in transcription regulation and chromatin signalling pathways. They are present in unicellular eukaryotes and in this study, the role of the BET protein Bdf1 has been explored in Saccharomyces cerevisiae. Mutation of Bdf1 bromodomains revealed defects on both the formation of spores and the meiotic progression, blocking cells at the exit from prophase, before the first meiotic division. This phenotype is associated with a ma ...[more]

PMID: 28068333

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Project description:Ray2013 - Meiotic initiation in S. cerevisiae A mathematical representation of early meiotic events, particularly feedback mechanisms at the system level and phosphorylation of signalling molecules for regulating protein activities, is described here This model is described in the article: Dynamic modeling of yeast meiotic initiation. Ray D, Su Y, Ye P. BMC Syst Biol. 2013 May 1;7:37 Abstract: BACKGROUND: Meiosis is the sexual reproduction process common to eukaryotes. The diploid yeast Saccharomyces cerevisiae undergoes meiosis in sporulation medium to form four haploid spores. Initiation of the process is tightly controlled by intricate networks of positive and negative feedback loops. Intriguingly, expression of early meiotic proteins occurs within a narrow time window. Further, sporulation efficiency is strikingly different for yeast strains with distinct mutations or genetic backgrounds. To investigate signal transduction pathways that regulate transient protein expression and sporulation efficiency, we develop a mathematical model using ordinary differential equations. The model describes early meiotic events, particularly feedback mechanisms at the system level and phosphorylation of signaling molecules for regulating protein activities. RESULTS: The mathematical model is capable of simulating the orderly and transient dynamics of meiotic proteins including Ime1, the master regulator of meiotic initiation, and Ime2, a kinase encoded by an early gene. The model is validated by quantitative sporulation phenotypes of single-gene knockouts. Thus, we can use the model to make novel predictions on the cooperation between proteins in the signaling pathway. Virtual perturbations on feedback loops suggest that both positive and negative feedback loops are required to terminate expression of early meiotic proteins. Bifurcation analyses on feedback loops indicate that multiple feedback loops are coordinated to modulate sporulation efficiency. In particular, positive auto-regulation of Ime2 produces a bistable system with a normal meiotic state and a more efficient meiotic state. CONCLUSIONS: By systematically scanning through feedback loops in the mathematical model, we demonstrate that, in yeast, the decisions to terminate protein expression and to sporulate at different efficiencies stem from feedback signals toward the master regulator Ime1 and the early meiotic protein Ime2. We argue that the architecture of meiotic initiation pathway generates a robust mechanism that assures a rapid and complete transition into meiosis. This type of systems-level regulation is a commonly used mechanism controlling developmental programs in yeast and other organisms. Our mathematical model uncovers key regulations that can be manipulated to enhance sporulation efficiency, an important first step in the development of new strategies for producing gametes with high quality and quantity. This model is hosted on BioModels Database and identified by: BIOMD0000000626 . To cite BioModels Database, please use: BioModels Database: An enhanced, curated and annotated resource for published quantitative kinetic models . To the extent possible under law, all copyright and related or neighbouring rights to this encoded model have been dedicated to the public domain worldwide. Please refer to CC0 Public Domain Dedication for more information.

Dataset Information

Yeast Bdf1 interactome - Bdf1 Bromodomains are Essential for Meiosis and the Expression of Meiotic-Specific Genes

Publications

Bdf1 Bromodomains Are Essential for Meiosis and the Expression of Meiotic-Specific Genes.

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