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Related Concept Videos

Regulation of Expression at Multiple Steps01:23

Regulation of Expression at Multiple Steps

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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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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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Structure of a Gene01:30

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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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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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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
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Gene expression noise in development: genome-wide dynamics.

Danique J C Bax1, Jeske Strik1, Lynn A P Schepens1

  • 1Department of Molecular Biology, Faculty of Science, Radboud Institute for Molecular Life Sciences (RIMLS), Radboud University, Nijmegen 6525GA, The Netherlands.

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|January 13, 2026
PubMed
Summary
This summary is machine-generated.

Gene expression noise causes cell variability, impacting cell fate during mammalian development. New technologies help quantify this noise, revealing insights into early embryogenesis and RNA variability.

Keywords:
bursting dynamicsembryonic developmentgene expression noisesingle-cell RNA sequencing

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Area of Science:

  • Developmental Biology
  • Genetics
  • Molecular Biology

Background:

  • Cell-to-cell variability in RNA and protein levels, known as gene expression noise, is observed even in homogeneous cell populations.
  • This variability is increasingly recognized for its functional importance in cell fate specification during mammalian development.
  • Recent technological advancements facilitate precise quantification and analysis of transcriptome variability.

Purpose of the Study:

  • To review recent findings on the significance of gene expression noise in early mammalian embryogenesis.
  • To focus on the role of RNA variability in developmental processes.
  • To discuss novel methodologies for quantifying and understanding the sources of gene expression noise.

Main Methods:

  • Review of recent literature on gene expression noise and mammalian development.
  • Focus on studies utilizing genome-wide and single-cell technologies.
  • Discussion of emerging approaches for noise quantification.

Main Results:

  • Gene expression noise plays a crucial role in early embryogenesis.
  • RNA variability is a key aspect of this noise.
  • New methods are improving the ability to dissect noise sources.

Conclusions:

  • Understanding gene expression noise is vital for deciphering early mammalian development.
  • Advances in technology are crucial for unraveling the complexities of transcriptome variability.
  • Further research into noise sources will yield deeper insights into developmental processes.