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Reference: Kelly, S, Kramer, S, Schwede, A et al., (2012). Genome organisation is a major component of gene expression control in response to stress and during the cell-division cycle in trypanosomes. Open Biology, 2 (4), 120033.Citable link to this page:

 

Genome organisation is a major component of gene expression control in response to stress and during the cell-division cycle in trypanosomes.

Abstract: The trypanosome genome is characterised by RNA polymerase II driven polycistronic transcription of protein coding genes. Ten to hundreds of genes are co-transcribed from a single promoter, thus selective regulation of individual genes via initiation is impossible. However, selective responses to external stimuli occur and post-transcriptional mechanisms are thought to account for all temporal gene expression patterns. We show that genes encoding mRNAs that are differentially regulated during the heat shock response are selectively positioned in polycistronic transcription units; down regulated genes are close to transcription initiation sites and up-regulated genes are distant. We demonstrate that the position of a reporter gene within transcription unit is sufficient to reproduce this effect. Analysis of gene ontology annotations reveals that positional bias is not restricted to stress response genes and that there is a genome-wide organization based on proximity to transcription initiation sites. Furthermore, we show that the relative abundance of mRNAs at different time points in the cell division cycle is dependent of the location of the corresponding genes to transcription initiation sites. This work provides evidence that the genome in trypanosomes is organised to facilitate co-coordinated temporal control of gene expression in the absence of selective promoters.

Publication status:Published

Bibliographic Details

Journal: Open Biologysee more from them

Issue Date: 2012-4

pages:120033Identifiers

Urn: uuid:6136a403-91db-4fb3-bd60-d6dd393c84f8

Source identifier: 312244

Eissn: 2046-2441

Doi: https://doi.org/10.1098/rsob.120033

Issn: 2046-2441 Item Description

Type: Journal article;

Language: eng Keywords: Trypanosoma brucei brucei RNA, Protozoan RNA Polymerase II Protozoan Proteins Heat-Shock Response Genome, Protozoan Transcription Initiation Site Gene Expression Regulation Stress, Physiological Cell Cycle RNA, Messenger Genes Tiny URL: pubs:312244

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Autor: Kelly, S - - - Kramer, S - - - Schwede, A - - - Maini, PK - - - Gull, K - institutionUniversity of Oxford Oxford, MSD, Pathology

Fuente: https://ora.ox.ac.uk/objects/uuid:6136a403-91db-4fb3-bd60-d6dd393c84f8



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