Examinando por Autor "Amann, R."

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Distinct ecotypes within a natural haloarchaeal population enable adaptation to changing environmental conditions without causing population sweeps
(Nature Research Journals, 2020-12-20) Viver, T.; Conrad, R. E.; Orellana, L. H.; Urdiain, M.; González Pastor, J. E.; Hatt, J. K.; Amann, R.; Antón, J.; Konstantinidis, K. T.; Rosselló Móra, R.; Agencia Estatal de Investigación (AEI); National Science Foundation ( USNSF); Ministerio de Economía y Competitividad (MINECO); Amann, R. [0000-0002-0846-7372]; Rosselló Mora, R. [0000-0001-8253-3107]; Konstantinidis, K. [0000-0002-0954-4755]; Urdiain, M. [0000-0001-6834-0237]
Microbial communities thriving in hypersaline brines of solar salterns are highly resistant and resilient to environmental changes, and salinity is a major factor that deterministically influences community structure. Here, we demonstrate that this resilience occurs even after rapid osmotic shocks caused by a threefold change in salinity (a reduction from 34 to 12% salts) leading to massive amounts of archaeal cell lysis. Specifically, our temporal metagenomic datasets identified two co-occurring ecotypes within the most dominant archaeal population of the brines Haloquadratum walsbyi that exhibited different salt concentration preferences. The dominant ecotype was generally more abundant and occurred in high-salt conditions (34%); the low abundance ecotype always co-occurred but was enriched at salinities around 20% or lower and carried unique gene content related to solute transport and gene regulation. Despite their apparent distinct ecological preferences, the ecotypes did not outcompete each other presumably due to weak functional differentiation between them. Further, the osmotic shock selected for a temporal increase in taxonomic and functional diversity at both the Hqr. walsbyi population and whole-community levels supporting the specialization-disturbance hypothesis, that is, the expectation that disturbance favors generalists. Altogether, our results provide new insights into how intraspecies diversity is maintained in light of substantial gene-content differences and major environmental perturbations.
Acceso Abierto
Roadmap for naming uncultivated Archaea and Bacteria
(Springer Nature Research Journals, 2020-06-08) Murray, A. E.; Freudenstein, J.; Gribaldo, S.; Hatzenpichler, R.; Hugenholtz, P.; Kämpfer, P.; Konstantinidis, K. T.; Lane, C. E.; Papke, R. T.; Parks, D. H.; Rossello Mora, R.; Stott, M. B.; Sutcliffe, I. C.; Thrash, J. C.; Venter, S. N.; Whitman, W. B.; Acinas, S. G.; Amann, R.; Anantharaman, K.; Armengaud, J.; Baker, B. J.; Barco, R. A.; Bode, H. B.; Boyd, E. S.; Brady, C. L.; Carini, P.; Chain, P. S. G.; Colman, D. R.; De Angelis, K. M.; Ríos, M. A.; De los Santos, P. E.; Dunlap, C. A.; Eisen, J. A.; Emerson, D.; Ettema, T. J. G.; Eveillard, D.; Girguis, P. R.; Hentschel, U.; Hollibaugh, J. T.; Hug, L. A.; Inskeep, W. P.; Ivanova, E. P.; Klenk, H. P.; Li, W. J.; Lloyd, K. G.; Löffler, F. E.; Makhalanyane, T. P.; Moser, D. P.; Nunoura, T.; Palmer, Marike; Parro García, V.; Pedros Alió, C.; Probst, A. J.; Smits, T. H. M.; Steen, A. D.; Steenkamp, E. T.; Spang, A.; Stewart, F. J.; Tiedje, J. M.; Vandamme, P.; Wagner, M.; Wang, F. P.; Yarza, P.; Hedlund, B. P.; Reysenbach, A. L.; National Science Foundation (NSF); Murray, A. E. [0000-0001-5790-7584]; Gribaldo, S. [0000-0002-7662-021X]; Hatzenpichler, R. [0000-0002-5489-3444]; Hugenholtz, P. [0000-0001-5386-7925]; Lane, C. [0000-0003-2558-2767]; Parks, D. H. [0000-0001-6662-9010]; Stott, M. B. [0000-0002-2082-9460]; Thrash, J. C. [0000-0003-0896-9986]; Anantharaman, K. [0000-0002-9584-2491]; Armegaud, J. [0000-0003-1589-445X]; Bode, H. B. [0000-0001-6048-5909]; De Angelis, K. M. [0000-0002-5585-4551]; De los Santos, P. E. [0000-0003-2407-0284]; Eisen, J. A. [0000-0002-0159-2197]; Ettema, T. J. G. [0000-0002-6898-6377]; Eveillard, D. [0000-0002-8162-7360]; Hentschel, U. [0000-0003-0596-790X]; Inskeep, W. P. [0000-0002-5203-817X]; Klenk, H. P. [0000-0001-6758-8150]; Palmer, M. [0000-0001-8395-8465]; Probst, A. [0000-0002-9392-6544]; Smits, T. H. M. [0000-0002-1237-235X]; Steen, A. D. [0000-0003-4297-4332]; Spang, A. [0000-0002-6518-8556]; Wang, F. [0000-0002-3429-8410]; Hedlund, B. [0000-0001-8530-0448]; Reysenbach, A. L. [0000-0001-9130-7750]; Amann, R. [0000-0002-0846-7372]; Unidad de Excelencia Científica María de Maeztu Centro de Astrobiología del Instituto Nacional de Técnica Aeroespacial y CSIC, MDM-2017-0737
The assembly of single-amplified genomes (SAGs) and metagenome-assembled genomes (MAGs) has led to a surge in genome-based discoveries of members affiliated with Archaea and Bacteria, bringing with it a need to develop guidelines for nomenclature of uncultivated microorganisms. The International Code of Nomenclature of Prokaryotes (ICNP) only recognizes cultures as ‘type material’, thereby preventing the naming of uncultivated organisms. In this Consensus Statement, we propose two potential paths to solve this nomenclatural conundrum. One option is the adoption of previously proposed modifications to the ICNP to recognize DNA sequences as acceptable type material; the other option creates a nomenclatural code for uncultivated Archaea and Bacteria that could eventually be merged with the ICNP in the future. Regardless of the path taken, we believe that action is needed now within the scientific community to develop consistent rules for nomenclature of uncultivated taxa in order to provide clarity and stability, and to effectively communicate microbial diversity