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Cell Specific Gene Expression01:58

Cell Specific Gene Expression

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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Nitrogen is an essential element in biological systems, forming a crucial component of proteins, nucleic acids, and other cellular constituents. Many bacteria and archaea acquire nitrogen in the form of nitrate (NO₃⁻) or ammonia (NH₃), which are then assimilated into biomolecules through specific enzymatic pathways.Assimilatory Nitrate ReductionWhen nitrate enters the cell, it undergoes a two-step reduction process known as assimilatory nitrate reduction. Initially, the enzyme nitrate reductase...
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Glucose transporters facilitate the transport of glucose across the cell membrane. In addition to glucose, some glucose transporters can also aid the movement of other hexoses such as fructose, mannose, and galactose.
Facilitated diffusion-glucose transporters (GLUTs) are encoded by the solute-linked carrier (SLC) family 2, subfamily A gene family, or SLC2A. The 14 GLUT protein members are distributed into three classes:
What is Gene Expression?01:36

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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 processed and...
What is Gene Expression?01:42

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Overview
Gene expression is the process in which DNA directs the synthesis of functional products, that is, proteins. Cells can regulate gene expression at various stages. It allows organisms to generate different cell types and enables cells to adapt to internal and external factors.
Genetic Information Flows from DNA to RNA to Protein
A gene is a stretch of DNA that serves as the blueprint for functional RNAs and proteins. Since DNA is made up of nucleotides and proteins consist of amino...

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Updated: Jul 18, 2026

Glutamine Flux Imaging Using Genetically Encoded Sensors
10:23

Glutamine Flux Imaging Using Genetically Encoded Sensors

Published on: July 31, 2014

Glutamine, gene expression, and cell function.

Rui Curi1, Philip Newsholme, Joaquim Procopio

  • 1Department of Physiology and Biophysics, Institute of Biomedical Sciences, University of São Paulo, São Paulo, SP, Brasil. ruicuri@icb.usp.br

Frontiers in Bioscience : a Journal and Virtual Library
|November 28, 2006
PubMed
Summary

Glutamine, the most abundant amino acid, regulates gene and protein expression impacting cell metabolism, survival, and function. Its roles extend beyond basic fuel, influencing complex cellular processes and signaling pathways.

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Area of Science:

  • Biochemistry
  • Cell Biology
  • Molecular Biology

Background:

  • Glutamine is the most abundant free amino acid.
  • It plays a role in various cell-specific processes, including metabolism, cell integrity, and protein synthesis.
  • Previous assumptions limited glutamine's function to a metabolic fuel or protein precursor.

Purpose of the Study:

  • To review and identify common mechanisms of glutamine-dependent changes.
  • To explore glutamine's regulatory role at gene and protein levels.
  • To highlight glutamine's function beyond a simple metabolic fuel.

Main Methods:

  • Literature review of studies on glutamine's cellular functions.
  • Analysis of research on gene and protein expression regulated by glutamine.
  • Identification of common signaling pathways activated by glutamine.

Main Results:

  • Glutamine regulates genes involved in metabolism, signal transduction, cell defense, and repair.
  • It activates intracellular signaling pathways.
  • Glutamine influences cell survival, proliferation, and extracellular matrix synthesis.
  • It impacts metabolic processes like oxidative fuel, gluconeogenesis, and lipogenesis.
  • Glutamine affects redox potential, respiratory burst, insulin resistance, and secretion.

Conclusions:

  • Glutamine's function is more complex than previously understood.
  • It acts as a key regulator of gene and protein expression.
  • Glutamine significantly impacts cellular functions and signaling pathways.