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Genome urbanization: clusters of topologically co-regulated genes delineate functional compartments in the genome of Saccharomyces cerevisiae.

Abstract：

:The eukaryotic genome evolves under the dual constraint of maintaining coordinated gene transcription and performing effective DNA replication and cell division, the coupling of which brings about inevitable DNA topological tension. DNA supercoiling is resolved and, in some cases, even harnessed by the genome through the function of DNA topoisomerases, as has been shown in the concurrent transcriptional activation and suppression of genes upon transient deactivation of topoisomerase II (topoII). By analyzing a genome-wide transcription run-on experiment upon thermal inactivation of topoII in Saccharomyces cerevisiae we were able to define 116 gene clusters of consistent response (either positive or negative) to topological stress. A comprehensive analysis of these topologically co-regulated gene clusters reveals pronounced preferences regarding their functional, regulatory and structural attributes. Genes that negatively respond to topological stress, are positioned in gene-dense pericentromeric regions, are more conserved and associated to essential functions, while upregulated gene clusters are preferentially located in the gene-sparse nuclear periphery, associated with secondary functions and under complex regulatory control. We propose that genome architecture evolves with a core of essential genes occupying a compact genomic 'old town', whereas more recently acquired, condition-specific genes tend to be located in a more spacious 'suburban' genomic periphery.

journal_name

Nucleic Acids Res

journal_title

Nucleic acids research

authors

Tsochatzidou M,Malliarou M,Papanikolaou N,Roca J,Nikolaou C

doi

10.1093/nar/gkx198

subject

Has Abstract

pub_date

2017-06-02 00:00:00

pages

5818-5828

issue

10

eissn

0305-1048

issn

1362-4962

pii

3079510

journal_volume

45

pub_type

杂志文章

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