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Annotation of Plant Gene Function via Combined Genomics, Metabolomics and Informatics
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Published on: June 17, 2012

Arabidopsis gene co-expression network and its functional modules.

Linyong Mao1, John L Van Hemert, Sudhansu Dash

  • 1Virtual Reality Applications Center, Iowa State University, Ames, IA 50010, USA. linyongmao@gmail.com

BMC Bioinformatics
|October 23, 2009
PubMed
Summary

Biological networks exhibit modular structures. Preferential connections between hub genes in Arabidopsis gene co-expression networks may drive this modularity, offering insights into functional gene organization.

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Area of Science:

  • Systems Biology
  • Bioinformatics
  • Genomics

Background:

  • Biological networks represent biomolecular interactions at a systems-level.
  • Modular structure, characterized by dense intra-module connections and sparse inter-module connections, is a key property of biological networks.
  • Understanding the relationship between network topology and modularity is crucial for deciphering biological functions.

Purpose of the Study:

  • To investigate the relationship between network topology and modular structure in gene co-expression networks.
  • To compare the modular organization of a genome-wide Arabidopsis gene co-expression network (AGCN) with random networks.
  • To explore the organization of gene functional modules.

Main Methods:

  • Construction of a genome-wide Arabidopsis gene co-expression network (AGCN) using 1094 microarrays.
  • Analysis of topological properties of the AGCN.
  • Partitioning the network into modules using an efficient graph clustering algorithm.
  • Comparison with a graphical Gaussian model (GGM) based Arabidopsis gene network.

Main Results:

  • The AGCN exhibited a modular structure with 382 hub genes forming a clique, densely connected to a small network subset.
  • Network clustering revealed systems-level understanding of gene modules coordinating biological processes (e.g., photosynthesis, cell cycle).
  • Modules identified in AGCN (e.g., photosynthesis, cell cycle) were larger and more comprehensive than those from the GGM network.

Conclusions:

  • Preferential hub-hub connections are likely essential for the formation of modular structures in gene co-expression networks.
  • The study provides new insights into the topological properties governing modularity in biological networks.
  • Novel understanding of gene functional module organization was revealed.