Transcriptomics

Dataset Information

11

Separation of DNA replication from the assembly of break-competent meiotic chromosomes


ABSTRACT: The meiotic cell division reduces the chromosome number from diploid to haploid to form gametes for sexual reproduction. Although much progress has been made in understanding meiotic recombination and the two meiotic divisions, the processes leading up to recombination, including the prolonged pre-meiotic S phase (meiS) and the assembly of meiotic chromosome axes, remain poorly defined. We have used genome-wide approaches in Saccharomyces cerevisiae to measure the kinetics of pre-meiotic DNA replication, and to investigate the interdependencies between replication and axis formation. We found that replication initiation was delayed for a large number of origins in meiS compared to mitosis, and that meiotic cells were far more sensitive to replication inhibition, most likely due to the starvation conditions required for meiotic induction. Moreover, replication initiation was delayed even in the absence of chromosome axes, indicating replication timing is independent of the process of axis assembly. Finally, we found that cells were able to install axis components and initiate recombination on unreplicated DNA. Thus, although pre-meiotic DNA replication and meiotic chromosome axis formation occur concurrently, they are not directly coupled. The functional separation of these processes reveals a modular method of building meiotic chromosomes, and predicts that any crosstalk between these modules must occur through superimposed regulatory mechanisms. Multiple studies of meiotic chromosomes were undertaken. To study DNA replication, the locations of replicative helicase (Mcm2-7) were mapped in pre-meiotic and pre-mitotic cells, and DNA replication profiles were created for pre-meiotic S (meiS) and pre-mitotic S (mitS) phases. Early origins were mapped in hydroxyurea for wild-type cells in mitS + 200mM HU, and meiS +20mM HU for wild-type, sml1, rec8 and spo11 deletion cells. Rec8, Hop1 and Red1 binding to meiotic chromosomes was evaluated using ChIP-chip in wild-type cells with and without 20 mM HU, and in cdc6-mn and clb5 clb6 delete cells. Finally, meiotic DNA double-strand breaks (DSBs) were mapped in cdc6-mn dmc1 delete cells by measuring the ssDNA that accumulates at DSB hotspots. This SuperSeries is composed of the following subset Series: GSE35658: Chromatin IP for Mcm2-7, Rec8, Hop1 and Red1 GSE35662: S phase and HU profiles in wild-type and mutant cells GSE35666: DSB formation in replication compromised cells

ORGANISM(S): Saccharomyces cerevisiae  

SUBMITTER: Andreas Hochwagen   Hannah G Blitzblau  Clara S Chan  Stephen P Bell 

PROVIDER: E-GEOD-35667 | ArrayExpress | 2012-06-14

SECONDARY ACCESSION(S): GSE35667PRJNA152437

REPOSITORIES: GEO, ArrayExpress

altmetric image

Publications

Separation of DNA replication from the assembly of break-competent meiotic chromosomes.

Blitzblau Hannah G HG   Chan Clara S CS   Hochwagen Andreas A   Bell Stephen P SP  

PLoS genetics 20120517 5


The meiotic cell division reduces the chromosome number from diploid to haploid to form gametes for sexual reproduction. Although much progress has been made in understanding meiotic recombination and the two meiotic divisions, the processes leading up to recombination, including the prolonged pre-meiotic S phase (meiS) and the assembly of meiotic chromosome axes, remain poorly defined. We have used genome-wide approaches in Saccharomyces cerevisiae to measure the kinetics of pre-meiotic DNA rep  ...[more]

Similar Datasets

2015-08-06 | E-GEOD-69230 | ArrayExpress
2012-06-18 | E-GEOD-35658 | ArrayExpress
2012-06-19 | GSE35662 | GEO
2012-06-18 | E-GEOD-35662 | ArrayExpress
2011-08-14 | E-GEOD-30073 | ArrayExpress
2012-06-18 | E-GEOD-35666 | ArrayExpress
2014-03-31 | E-GEOD-52862 | ArrayExpress
2011-08-14 | E-GEOD-30071 | ArrayExpress
2014-03-31 | E-GEOD-52858 | ArrayExpress
2010-07-01 | E-GEOD-5284 | ArrayExpress