| recombination shapes the natural population structure of the hyperthermophilic archaeon sulfolobus islandicus. | although microorganisms make up the preponderance of the biodiversity on earth, the ecological and evolutionary factors that structure microbial populations are not well understood. we investigated the genetic structure of a thermoacidophilic crenarchaeal species, sulfolobus islandicus, using multilocus sequence analysis of six variable protein-coding loci on a set of 60 isolates from the mutnovsky region of kamchatka, russia. we demonstrate significant incongruence among gene genealogies and a ... | 2005 | 16093568 |
| geographic divergence of "sulfolobus islandicus" strains assessed by genomic analyses including electronic dna hybridization confirms they are geovars. | ten well-annotated genomes of "sulfolobus islandicus" strains from different geographic locations have been released at the ncbi database. whole genome based composition vector trees indicate that these strains show the same branching patterns as originally reported by multi-locus sequence analysis. to determine whether the ten strains meet the criteria for separate species, dna-dna hybridization (ddh) was performed in silico. ddh values of strains from the same geographic location, i.e., icelan ... | 2014 | 24301254 |
| patterns of gene flow define species of thermophilic archaea. | despite a growing appreciation of their vast diversity in nature, mechanisms of speciation are poorly understood in bacteria and archaea. here we use high-throughput genome sequencing to identify ongoing speciation in the thermoacidophilic archaeon sulfolobus islandicus. patterns of homologous gene flow among genomes of 12 strains from a single hot spring in kamchatka, russia, demonstrate higher levels of gene flow within than between two persistent, coexisting groups, demonstrating that these m ... | 2012 | 22363207 |
| reassortment of crispr repeat-spacer loci in sulfolobus islandicus. | virus-host interactions are a key factor shaping population dynamics of microbial species. the crispr-cas adaptive immune system confers sequence-specific immunity to viral infection and has the potential to dramatically shape coevolutionary interactions between viruses and their microbial hosts. to assess evolutionary dynamics of crispr loci, we have sampled a population of closely related sulfolobus islandicus strains from kamchatka, russia at two time points, 10 years apart. sequence analysis ... | 2013 | 23701169 |