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Combinatorial Gene Control

Combinatorial Gene Control

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.
The expression of more than 30,000 genes is controlled by approximately 2000-3000 transcription factors. This is possible because a single transcription factor can recognize more than one regulatory sequence. The specificity in gene...

Structure of a Gene

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.
However, only 1% of the DNA is composed of genes that encode proteins; the rest, 99% is non-coding DNA. This non-coding DNA performs...

Regulation of Expression Occurs at Multiple Steps

Regulation of Expression Occurs at Multiple Steps

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.
Transcription results in the generation of precursor (pre-mRNA) that consists of both exons and introns, which needs further processing before being translated to a...

Regulation of Expression Occurs at Multiple Steps

Regulation of Expression Occurs at Multiple Steps

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.
Transcription results in the generation of precursor (pre-mRNA) that consists of both exons and introns, which needs further processing before being translated to a...

Regulation of Expression at Multiple Steps

Regulation of Expression at Multiple Steps

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 addition of a...

What is Gene Expression?

What is Gene Expression?

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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Related Experiment Video

Updated: May 11, 2026

Quantification of Information Encoded by Gene Expression Levels During Lifespan Modulation Under Broad-range Dietary Restriction in C. elegans

Quantification of Information Encoded by Gene Expression Levels During Lifespan Modulation Under Broad-range Dietary Restriction in C. elegans

Published on: August 16, 2017

Information theory, gene expression, and combinatorial regulation: a quantitative analysis.

Jürgen Jost¹, Klaus Scherrer

¹, Leipzig, Germany, jjost@mis.mpg.de.

Theory in Biosciences = Theorie in Den Biowissenschaften

|May 16, 2013

Summary

This summary is machine-generated.

This study redefines genes as functional units requiring RNA processing for polypeptide assembly. It introduces formal models to quantify gene expression and regulation through RNA-protein interactions.

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Published on: August 31, 2013

Area of Science:

Molecular Biology
Systems Biology
Bioinformatics

Background:

A functional definition of a gene emphasizes its role in producing polypeptides, not its DNA sequence alone.
Gene expression and regulation necessitate information on the timing and quantity of polypeptide production.

Purpose of the Study:

To develop a conceptual framework and formal models for gene expression and regulation.
To quantify and compare the product and regulatory information involved in gene expression.

Main Methods:

Analysis of biochemical data to inform a conceptual framework.
Development of formal models for coordinated gene expression.
Investigation of transcript and mRNA interactions with proteins via a regulatory code.

Main Results:

Genes are assembled from heterogeneous pieces during RNA processing, not present as complete units at the DNA level.
Nucleotides in transcripts and mRNA function both in coding amino acids and in regulatory oligomotifs for protein binding.
A precise regulatory code governs the interaction of transcripts, mRNAs, and proteins.

Conclusions:

Gene expression is a dynamic process involving RNA assembly and complex regulatory interactions.
Formal models can quantify the information flow in gene regulation.
This framework provides a new perspective on gene function and regulation.