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Related Concept Videos

Structure of a Gene01:30

Structure of a Gene

A gene is the fundamental unit of heredity. Every individual has two copies of each gene, one inherited from each parent. Although most people contain the same genes, there is a small fraction that is slightly different amongst people. A gene with a small difference in its sequence of DNA bases forms different alleles, contributing to different phenotypes.
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Combinatorial gene control is the synergistic action of several transcriptional factors to regulate the expression of a single gene. The absence of one or more of these factors may lead to a significant difference in the level of gene expression or repression.
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Reporter Genes

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.
Commonly used reporter...
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Constitutive and Regulated Gene Expression

Gene expression in prokaryotes is governed by constitutive and regulated systems, allowing cells to balance the production of essential proteins with adaptive responses to environmental changes.Constitutive Gene ExpressionConstitutive, or housekeeping, genes are continuously expressed as they encode proteins vital for fundamental cellular processes. These include enzymes for glycolysis, ribosomal components for protein synthesis, and proteins involved in DNA replication. Their constant...
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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
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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...

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Functional Surface-immobilization of Genes Using Multistep Strand Displacement Lithography
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Published on: October 25, 2018

Geometry-induced bursting dynamics in gene expression.

B Meyer1, O Bénichou, Y Kafri

  • 1UMR 7600, Université Pierre et Marie Curie/CNRS, Paris, France.

Biophysical Journal
|July 25, 2012
PubMed
Summary
This summary is machine-generated.

Gene transcription noise is influenced by how regulatory molecules move within cells. Cell confinement and molecule trajectory geometry significantly impact gene expression patterns, revealing underlying transcription mechanisms.

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Area of Science:

  • Molecular Biology
  • Biophysics
  • Systems Biology

Background:

  • Gene transcription exhibits stochasticity, leading to variations in mRNA and protein levels.
  • Temporal patterns range from simple kinetics to bursting, causing cell-to-cell heterogeneity.

Purpose of the Study:

  • To investigate the impact of regulatory molecule transport dynamics on gene expression noise.
  • To analyze how confinement and finite transcription factor numbers affect transcription kinetics.
  • To identify experimental methods for distinguishing transcription mechanisms.

Main Methods:

  • Analytical calculation of time-dependent correlation functions for mRNA levels.
  • Modeling of transcription factor dynamics considering confinement within the cell.
  • Analysis of various transport mechanisms and their effect on gene expression noise.

Main Results:

  • Confinement effects significantly alter gene expression noise, especially with low transcription factor numbers.
  • Analytical results diverge from models ignoring molecular confinement.
  • Transcription factor trajectory geometry is crucial for generating diverse transcription patterns.

Conclusions:

  • Dynamical quantities derived from this model can experimentally identify transcription mechanisms.
  • Cellular confinement and the geometry of molecular transport are key determinants of gene expression patterns.
  • This work provides a framework for understanding noise in gene expression through molecular dynamics.