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Millimeter-scale genetic gradients and community-level molecular convergence in a hypersaline microbial mat.

ABSTRACT: To investigate the extent of genetic stratification in structured microbial communities, we compared the metagenomes of 10 successive layers of a phylogenetically complex hypersaline mat from Guerrero Negro, Mexico. We found pronounced millimeter-scale genetic gradients that were consistent with the physicochemical profile of the mat. Despite these gradients, all layers displayed near-identical and acid-shifted isoelectric point profiles due to a molecular convergence of amino-acid usage, indicating that hypersalinity enforces an overriding selective pressure on the mat community.

SUBMITTER: Kunin V 

PROVIDER: S-EPMC2483411 | biostudies-literature | 2008

REPOSITORIES: biostudies-literature

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Millimeter-scale genetic gradients and community-level molecular convergence in a hypersaline microbial mat.

Kunin Victor V   Raes Jeroen J   Harris J Kirk JK   Spear John R JR   Walker Jeffrey J JJ   Ivanova Natalia N   von Mering Christian C   Bebout Brad M BM   Pace Norman R NR   Bork Peer P   Hugenholtz Philip P  

Molecular systems biology 20080603

To investigate the extent of genetic stratification in structured microbial communities, we compared the metagenomes of 10 successive layers of a phylogenetically complex hypersaline mat from Guerrero Negro, Mexico. We found pronounced millimeter-scale genetic gradients that were consistent with the physicochemical profile of the mat. Despite these gradients, all layers displayed near-identical and acid-shifted isoelectric point profiles due to a molecular convergence of amino-acid usage, indica  ...[more]

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