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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.
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...
Cis-regulatory Sequences02:02

Cis-regulatory Sequences

Cis-regulatory sequences are short fragments of non-coding DNA that are present on the same chromosomes as the genes that they regulate. These fragments serve as binding sites for transcriptional regulators, proteins that are responsible for controlling gene transcription and differential gene expression across cell types in eukaryotes. Cis-regulatory sequences can be close to the gene of interest or thousands of bases away in the DNA sequence; however, those sequences that are further away are...
Cis-regulatory Sequences02:02

Cis-regulatory Sequences

Cis-regulatory sequences are short fragments of non-coding DNA that are present on the same chromosomes as the genes that they regulate. These fragments serve as binding sites for transcriptional regulators, proteins that are responsible for controlling gene transcription and differential gene expression across cell types in eukaryotes. Cis-regulatory sequences can be close to the gene of interest or thousands of bases away in the DNA sequence; however, those sequences that are further away are...
Prokaryotic Gene Structure and Organization01:28

Prokaryotic Gene Structure and Organization

Prokaryotic genomes exhibit a streamlined organization of coding and non-coding regions essential for gene expression and protein synthesis. While coding regions contain the genetic instructions for proteins or functional RNAs, non-coding regions regulate the precise transcription and translation of these genes.Coding Regions: Proteins and RNAsThe primary coding regions, known as structural genes, include sequences transcribed into messenger RNA (mRNA) and ultimately translated into...
Operon Model01:23

Operon Model

The operon model represents a fundamental mechanism of gene regulation in prokaryotes, enabling coordinated expression of genes involved in related metabolic or functional pathways. Operons consist of structural genes, a promoter, and an operator, with transcription regulated by repressors, activators, and small effector molecules.Structure and Function of OperonsAn operon is a cluster of structural genes transcribed together under the control of a single promoter. The promoter region...
Transcriptional Regulation: Riboswitches01:23

Transcriptional Regulation: Riboswitches

Riboswitches are RNA elements that regulate gene expression by altering their secondary structures in response to specific effector molecules. These elements, located in the leader regions of certain mRNAs, act as transcriptional regulators by toggling between alternative conformations to control downstream gene expression. Riboswitch-mediated regulation is a precise mechanism for modulating biosynthetic pathways, as exemplified by the riboflavin biosynthesis pathway in Bacillus...

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Mapping Bacterial Functional Networks and Pathways in Escherichia Coli using Synthetic Genetic Arrays
14:06

Mapping Bacterial Functional Networks and Pathways in Escherichia Coli using Synthetic Genetic Arrays

Published on: November 12, 2012

Structure-function relations are subtle in genetic regulatory networks.

Michael E Wall1

  • 1Computer, Computational, and Statistical Sciences Division, Center for Nonlinear Studies, Los Alamos National Laboratory, Los Alamos, NM 87505, USA. mewall@lanl.gov

Mathematical Biosciences
|February 19, 2011
PubMed
Summary
This summary is machine-generated.

Genetic regulatory networks are influenced by more than just their structure. Factors like input signals, metabolism, and transcription mechanisms are crucial for predicting gene circuit behavior.

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Area of Science:

  • Systems Biology
  • Molecular Biology
  • Genetics

Background:

  • Recent research explores structure-function relationships in genetic regulatory networks.
  • Understanding gene regulation requires considering factors beyond network topology.

Purpose of the Study:

  • To investigate the critical factors influencing the input-output behavior of genetic regulatory networks.
  • To explore how metabolism and transcription mechanisms affect gene regulation.
  • To assess the predictability of information processing roles in gene circuits.

Main Methods:

  • Modeling of feed-forward loops to analyze input-output behavior.
  • Studies on the induction of the lac operon in Escherichia coli, incorporating metabolic influences.
  • Combined experimental and computational approaches to examine transcription activation by MarA.

Main Results:

  • Input-output behavior is highly dependent on input signals and transcription interactions.
  • Metabolism plays a significant role in determining the behavior of genetic regulatory networks, as seen in lac operon induction.
  • Transcription regulation mechanisms, not always apparent at the network level, impact overall gene regulation.

Conclusions:

  • Gene regulation is significantly influenced by factors beyond the inherent topology of genetic interactions.
  • Predicting the precise information processing functions of gene circuits is challenging but feasible.
  • Considering the evolution of proteins and networks may enhance predictive capabilities.