Nature y biodiversidad

En la revista Nature han publicado un trabajo acerca de diversidad de poblaciones microbianas y de la importancia que tiene la recombinación génica en dichas poblaciones. Estos son los primeros pasos, junto a los trabajos publicados en PLoS, y algunos más relacionados, dedicados a conocer realmente cómo se relacionan los individuos en comunidades naturales de microorganismos, y los procesos evolutivos que en ellas ocurren.
El primer párrafo de dicho trabajo:

Letter
Nature advance online publication 7 March 2007 doi:10.1038/nature05624;
Received 16 November 2006; Accepted 26 January 2007; Published online 7 March 2007

Strain-resolved community proteomics reveals recombining genomes of acidophilic bacteria
Ian Lo1, Vincent J. Denef1, Nathan C. VerBerkmoes2, Manesh B. Shah2, Daniela Goltsman1, Genevieve DiBartolo1, Gene W. Tyson1, Eric E. Allen1, Rachna J. Ram1, J. Chris Detter3, Paul Richardson3, Michael P. Thelen4, Robert L. Hettich2 and Jillian F. Banfield1
University of California, Berkeley, California 94720, USA
Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
Joint Genome Institute, Walnut Creek, California 94598, USA
Lawrence Livermore National Laboratory, Livermore, California 94550, USA
Correspondence to: Jillian F. Banfield1 Correspondence and requests for materials should be addressed to J.F.B. (Email: jbanfield@berkeley.edu).

Microbes comprise the majority of extant organisms, yet much remains to be learned about the nature and driving forces of microbial diversification. Our understanding of how microorganisms adapt and evolve can be advanced by genome-wide documentation of the patterns of genetic exchange, particularly if analyses target coexisting members of natural communities. Here we use community genomic data sets to identify, with strain specificity, expressed proteins from the dominant member of a genomically uncharacterized, natural, acidophilic biofilm. Proteomics results reveal a genome shaped by recombination involving chromosomal regions of tens to hundreds of kilobases long that are derived from two closely related bacterial populations. Inter-population genetic exchange was confirmed by multilocus sequence typing of isolates and of uncultivated natural consortia. The findings suggest that exchange of large blocks of gene variants is crucial for the adaptation to specific ecological niches within the very acidic, metal-rich environment. Mass-spectrometry-based discrimination of expressed protein products that differ by as little as a single amino acid enables us to distinguish the behaviour of closely related coexisting organisms. This is important, given that microorganisms grouped together as a single species may have quite distinct roles in natural systems and their interactions might be key to ecosystem optimization. Because proteomic data simultaneously convey information about genome type and activity, strain-resolved community proteomics is an important complement to cultivation-independent genomic (metagenomic) analysis of microorganisms in the natural environment.