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Regulation of Expression at Multiple Steps01:23

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The gene expression in cells is regulated at different stages: (i) transcription, (ii) RNA processing, (iii) RNA localization, and (iv) translation. Transcriptional regulation is mediated by regulatory proteins such as transcription factors, activators, or repressors—these control gene expression by initiating or inhibiting the transcription of genes. Once a precursor or pre-mRNA is produced, it undergoes post-transcriptional modification, including 5' capping, splicing, and the...
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Multicellular organisms contain a variety of structurally and functionally distinct cell types, but the DNA in all the cells originated from the same parent cells. The differences in the cells can be attributed to the differential gene expression. Liver cells, whose functions include detoxification of blood, production of bile to metabolize fats, and synthesis of proteins essential for metabolism, must express a specific set of genes to perform their functions. Gene expression also varies with...
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Gene expression can be regulated at almost every step from gene to protein. Transcription is the step that is most commonly regulated. This involves the binding of proteins to short regulatory sequences on the DNA. This association can either promote or inhibit the transcription of a gene associated with the respective sequence.
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A gene is a stretch of DNA that serves as the blueprint for functional RNAs and proteins. Since DNA is comprised  of nucleotides and proteins are comprised of amino acids, a mediator is required to convert the information encoded in DNA into proteins. This mediator is the messenger RNA (mRNA). mRNA copies the blueprint from DNA by a process called transcription. In eukaryotes, transcription occurs in the nucleus by complementary base-pairing with the DNA template. The mRNA is then...
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Overview
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Reporter genes are a type of protein-coding gene that are often tagged to a gene of interest. Once inside a target cell, reporter genes usually produce visually identifiable characteristics like fluorescence and luminescence when expressed along with the gene of interest. Thus, reporter genes “report” the presence or absence of genes of interest in an organism, determine the gene expression pattern, or track the physical location of a DNA segment or protein in the cell.
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Amino acids regulate transgene expression in MDCK cells.

Marta Torrente1, Adriano Guetg1, Jörn Oliver Sass2

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High extracellular amino acid levels inhibit amino acid transporter expression in kidney cells. Mycoplasma infection, however, upregulates transporter genes, potentially via the GCN2 pathway.

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Area of Science:

  • Cell Biology
  • Molecular Biology
  • Renal Physiology

Background:

  • Gene expression and cell growth depend on intracellular amino acid levels.
  • Metazoan amino acid homeostasis relies on extracellular availability and transmembrane transport.
  • Concentrative amino acid transporters are crucial for nutrient uptake in tissues like the kidney.

Purpose of the Study:

  • To investigate how extracellular amino acid concentrations affect the expression of the neutral amino acid transporter B0AT1-collectrin (SLC6A19-TMEM27).
  • To determine the stability and function of overexpressed B0AT1-collectrin in kidney epithelial cells.
  • To explore factors influencing the regulation of amino acid transporter expression.

Main Methods:

  • Overexpression of B0AT1-collectrin (SLC6A19-TMEM27) in MDCK cell epithelia.
  • Culturing cells with varying extracellular amino acid concentrations (physiological vs. standard media).
  • Assessing transgene expression stability, protein localization, and amino acid uptake; monitoring for mycoplasma infection and GCN2 pathway activation.

Main Results:

  • Exogenously expressed B0AT1-collectrin localized to the luminal membrane and mediated amino acid uptake but was unstable over passages.
  • Transgene loss was not linked to physiological amino acid concentrations but was influenced by other factors.
  • Mycoplasma infection significantly increased transgene expression, correlating with L-arginine metabolism and GCN2 pathway activation (eIF2α phosphorylation).

Conclusions:

  • High extracellular amino acid concentrations in standard cell culture media inhibit the constitutive expression of concentrative amino acid transporters.
  • Mycoplasma infection induces the expression of these transporters, possibly by depleting L-arginine and activating the GCN2 signaling pathway.
  • This suggests a complex regulatory mechanism for amino acid transporter expression influenced by nutrient availability and cellular stress.