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Author Bamps, Sophie ♦ Wirtz, Julia ♦ Hope, Ian A.
Source SpringerLink
Content type Text
Publisher Springer-Verlag
File Format PDF
Copyright Year ©2011
Language English
Subject Domain (in DDC) Natural sciences & mathematics ♦ Life sciences; biology
Subject Keyword Caenorhabditis elegans ♦ Gene expression ♦ Gene regulation ♦ Reporter quantification ♦ Transcription factor gene ♦ Plant Genetics & Genomics ♦ Cell Biology ♦ Microbial Genetics and Genomics ♦ Animal Genetics and Genomics ♦ Biochemistry
Abstract Regulatory transcription factors operate in networks, conferring biological robustness that makes dissection of such gene control processes difficult. The nematode Caenorhabditis elegans is a powerful molecular genetic system that allows the close scrutiny needed to understand these processes in an animal, in vivo. Strikingly lower levels of gene expression were observed when a gfp reporter was inserted into C. elegans transcription factor genes, in their broader genomic context, in comparison to when the reporter was fused to just the promoter regions. The lower level of expression is more consistent with endogenous levels of the gene products, based on independent protein and transcript assays. Through successive precise manipulations of the reporter fusion genes, elements essential for the lower level of expression were localised to the protein-coding region. With a closer focus on four transcription factor genes, the expression of both genes encoding transcriptional activators was found to be restricted by a post-transcriptional mechanism while expression of both genes encoding transcriptional repressors was delimited by transcriptional repression. An element through which the transcriptional repression acts for unc-4 was localised to a 30 base-pair region of a protein-encoding exon, with potentially wider implications for how homeobox genes operate. The hypothesis that the distinction in mechanisms delimiting expression of the two types of transcription factor genes, as observed here, may apply more widely is raised. This leads to observations concerning the implications of these different mechanisms on stochastic noise in gene expression and the consequent significance for developmental decisions in general.
ISSN 16174615
Age Range 18 to 22 years ♦ above 22 year
Educational Use Research
Education Level UG and PG
Learning Resource Type Article
Publisher Date 2011-06-08
Publisher Place Berlin/Heidelberg
e-ISSN 16174623
Journal Molecular and General Genetics MGG
Volume Number 286
Issue Number 2
Page Count 13
Starting Page 95
Ending Page 107

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Source: SpringerLink