Community-wide analysis of microbial genome sequence signatures
Abstract
Background: Analyses of DNA sequences from cultivated microorganisms have revealed genome-wide, taxa-specific nucleotide compositional characteristics, referred to as genome signatures. These signatures have far-reaching implications for understanding genome evolution and potential application in classification of metagenomic sequence fragments. However, little is known regarding the distribution of genome signatures in natural microbial communities or the extent to which environmental factors shape them. Results: We analyzed metagenomic sequence data from two acidophilic biofilm communities, including composite genomes reconstructed for nine archaea, three bacteria, and numerous associated viruses, as well as thousands of unassigned fragments from strain variants and low abundance organisms. Genome signatures, in the form of tetranucleotide frequencies analyzed by emergent self-organizing maps, segregated sequences from all known populations sharing < 50 to 60% average amino acid identity and revealed previously unknown genomic clusters corresponding to low-abundance organisms and a putative plasmid. Signatures were pervasive genome-wide. Clusters were resolved because intra-genome differences resulting from translational selection or protein adaptation to the intracellular (pH ~5) versus extracellular (pH ~1) environment were small relative to inter-genome differences. We found that these genome signatures stem from multiple influences but are primarily manifested through codon composition, which we propose is the result of genome-specific mutationalmore »
- Authors:
-
- Univ. of California, Berkeley, CA (United States). Dept. of Earth and Planetary Science
- Univ. of California, Berkeley, CA (United States). Dept. of Earth and Planetary Science; Univ. of California, Berkeley, CA (United States). Dept. of Environmental Science, Policy, and Management
- Publication Date:
- Research Org.:
- Univ. of California, Oakland, CA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Biological and Environmental Research (BER). Earth and Environmental Systems Science Division
- OSTI Identifier:
- 1626734
- Grant/Contract Number:
- FG02-05ER64134
- Resource Type:
- Accepted Manuscript
- Journal Name:
- GenomeBiology.com
- Additional Journal Information:
- Journal Volume: 10; Journal Issue: 8; Journal ID: ISSN 1465-6906
- Publisher:
- BioMed Central
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 59 BASIC BIOLOGICAL SCIENCES; Biotechnology & Applied Microbiology; Genetics & Heredity
Citation Formats
Dick, Gregory J., Andersson, Anders F., Baker, Brett J., Simmons, Sheri L., Thomas, Brian C., Yelton, A. Pepper, and Banfield, Jillian F. Community-wide analysis of microbial genome sequence signatures. United States: N. p., 2009.
Web. doi:10.1186/gb-2009-10-8-r85.
Dick, Gregory J., Andersson, Anders F., Baker, Brett J., Simmons, Sheri L., Thomas, Brian C., Yelton, A. Pepper, & Banfield, Jillian F. Community-wide analysis of microbial genome sequence signatures. United States. https://doi.org/10.1186/gb-2009-10-8-r85
Dick, Gregory J., Andersson, Anders F., Baker, Brett J., Simmons, Sheri L., Thomas, Brian C., Yelton, A. Pepper, and Banfield, Jillian F. Thu .
"Community-wide analysis of microbial genome sequence signatures". United States. https://doi.org/10.1186/gb-2009-10-8-r85. https://www.osti.gov/servlets/purl/1626734.
@article{osti_1626734,
title = {Community-wide analysis of microbial genome sequence signatures},
author = {Dick, Gregory J. and Andersson, Anders F. and Baker, Brett J. and Simmons, Sheri L. and Thomas, Brian C. and Yelton, A. Pepper and Banfield, Jillian F.},
abstractNote = {Background: Analyses of DNA sequences from cultivated microorganisms have revealed genome-wide, taxa-specific nucleotide compositional characteristics, referred to as genome signatures. These signatures have far-reaching implications for understanding genome evolution and potential application in classification of metagenomic sequence fragments. However, little is known regarding the distribution of genome signatures in natural microbial communities or the extent to which environmental factors shape them. Results: We analyzed metagenomic sequence data from two acidophilic biofilm communities, including composite genomes reconstructed for nine archaea, three bacteria, and numerous associated viruses, as well as thousands of unassigned fragments from strain variants and low abundance organisms. Genome signatures, in the form of tetranucleotide frequencies analyzed by emergent self-organizing maps, segregated sequences from all known populations sharing < 50 to 60% average amino acid identity and revealed previously unknown genomic clusters corresponding to low-abundance organisms and a putative plasmid. Signatures were pervasive genome-wide. Clusters were resolved because intra-genome differences resulting from translational selection or protein adaptation to the intracellular (pH ~5) versus extracellular (pH ~1) environment were small relative to inter-genome differences. We found that these genome signatures stem from multiple influences but are primarily manifested through codon composition, which we propose is the result of genome-specific mutational biases. Conclusions: An important conclusion is that shared environmental pressures and interactions among coevolving organisms do not obscure genome signatures in acid mine drainage communities. Thus, genome signatures can be used to assign sequence fragments to populations, an essential prerequisite if metagenomics is to provide ecological and biochemical insights into the functioning of microbial communities.},
doi = {10.1186/gb-2009-10-8-r85},
journal = {GenomeBiology.com},
number = 8,
volume = 10,
place = {United States},
year = {Thu Jan 01 00:00:00 EST 2009},
month = {Thu Jan 01 00:00:00 EST 2009}
}
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