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Related Concept Videos

Prokaryotic Cells01:28

Prokaryotic Cells

Prokaryotes are small unicellular organisms that include the domains — Archaea and Bacteria. Bacteria include many common microorganisms, such as Salmonella and E. coli, while the Archaea include extremophiles that live in harsh environments, such as volcanic springs.
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Prokaryotic Cells01:51

Prokaryotic Cells

Prokaryotes are small unicellular organisms that include the domains—Archaea and Bacteria. Bacteria include many common organisms, such as Salmonella and E. coli, while the Archaea include extremophiles that live in harsh environments, such as volcanic springs.Like eukaryotic cells, all prokaryotic cells are surrounded by a plasma membrane, have genetic material in the form of single, circular DNA, a cytoplasm that fills the interior of the cell, and ribosomes that synthesize proteins. However,...
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Biosynthesis in bacteria is a fundamental anabolic process that generates essential macromolecules, including proteins, nucleic acids, lipids, and polysaccharides. These macromolecules are critical for cellular growth, replication, and function. The process is tightly regulated and energetically linked to catabolic pathways to ensure optimal resource utilization.Biosynthetic pathways begin with precursor metabolites such as pyruvate, acetyl-CoA, and glucose-6-phosphate derived from glycolysis,...
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Bacterial signaling can occur within bacteria (intracellular) or between bacteria (intercellular). At times, a group of bacteria behaves like a community. To achieve this, they engage in quorum sensing, the perception of higher cell density that causes changes in gene expression. Quorum sensing involves both extracellular and intracellular signaling. The signaling cascade starts with a molecule called an autoinducer (AI). Individual bacteria produce AIs that move out of the bacterial cell...
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Biology of Microbial Communities - Interview
14:42

Biology of Microbial Communities - Interview

Published on: May 28, 2007

Bacteria as computers making computers.

Antoine Danchin1

  • 1Génétique des Génomes Bactériens, Institut Pasteur, Paris, France. antoine.danchin@normalesup.org

FEMS Microbiology Reviews
|November 20, 2008
PubMed
Summary
This summary is machine-generated.

Microbial systems biology redefines biological networks by focusing on information and recursivity. This approach analyzes the genetic program

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Area of Science:

  • Microbial systems biology
  • Computational biology
  • Genomics

Background:

  • Current microbial systems biology integrates biological knowledge into interaction networks.
  • A novel trend in systems biology emphasizes recursivity and information over traditional models like differential equations.
  • Gene expression separates the genome from cellular machinery, analogous to the machine-program separation in computers.

Purpose of the Study:

  • To investigate the organizational principles of the genetic program required for cellular self-replication.
  • To analyze the role of information dynamics in microbial systems.
  • To propose a framework for understanding microbial genomes as comprising a paleome and a cenome.

Main Methods:

  • Review of existing literature integrating molecular biology and computer sciences.
  • Analysis of the conceptual separation between biological 'machine' and 'program'.
  • Investigation of microbial genome organization into paleome (constructor, replicator) and cenome (context-specific genes).

Main Results:

  • Microbial genomes are organized into a paleome (origin-of-life functions, constructor, replicator) and a cenome (community-relevant genes).
  • Cell duplication involves rejuvenation of the cellular 'machine' and replication of the genetic 'program'.
  • The paleome contains genes facilitating information accumulation across generations via a ratchet-like mechanism.

Conclusions:

  • Systems biology must incorporate the dynamics of information creation for a comprehensive understanding of microbial life.
  • The paleome and cenome model provides a new perspective on microbial genome organization and function.
  • Understanding the genetic program's organization is crucial for explaining cellular self-replication and evolution.