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A transcriptional activator is a protein (transcription factor) that increases transcription of a gene or set of genes. [1] Activators are considered to have positive control over gene expression, as they function to promote gene transcription and, in some cases, are required for the transcription of genes to occur.
The genes of the qa cluster are responsible for the catabolism of quinic acid, which is used by the fungus as a carbon source in conditions of low glucose. [7] The cluster contains a transcriptional activator qa-1F, a transcriptional repressor qa-1S, and five structural genes. The qa-1F binds to a specific DNA sequence, found upstream of the qa ...
The transactivator gene expresses a transcription factor that binds to specific promoter region of DNA. By binding to the promoter region of a gene, the transcription factor causes that gene to be expressed. The expression of one transactivator gene can activate multiple genes, as long as they have the same, specific promoter region attached.
The dCas9 activation system allows a desired gene or multiple genes in the same cell to be expressed. It is possible to study genes involved in a certain process using a genome wide screen that involves activating expression of genes. Examining which sgRNAs yield a phenotype suggests which genes are involved in a specific pathway.
In bacterial genetics, the mal regulon is a regulon - or group of genes under common regulation - associated with the catabolism of maltose and maltodextrins.The system is especially well characterized in the model organism Escherichia coli, where it is classically described as a group of ten genes in multiple operons whose expression is regulated by a single regulatory protein, malT.
Hepatocyte growth factor activator is a protein that in humans is encoded by the HGFAC gene. [5] [6] [7]The protein encoded by this gene, belongs to peptidase family S1. It is first synthesized as an inactive single-chain precursor before being activated to a heterodimeric form by endoproteolytic processing.
Under non-stressed conditions, Drosophila HSF is a nuclear-localized unbound monomer, whereas heat shock activation results in trimerization and binding to the HSE. [5] The Heat Shock sequence Element is highly conserved from yeast to humans. [6] Heat shock factor 1 (HSF-1) is the major regulator of heat shock protein transcription in ...
In contrast to RNAi, promoter-targeted saRNAs induce prolonged activation of gene expression associated with epigenetic changes. [15] It is currently suggested that saRNAs are first loaded and processed by an Ago protein to form an Ago-RNA complex which is then guided by the RNA to its promoter target.
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