Phylogenomic Insight into Salinispora (Bacteria, Actinobacteria) Species Designations

Bacteria represent the most genetically diverse kingdom of life. While great progress has been made in describing this diversity, it remains difficult to identify the phylogenetic and ecological characteristics that delineate groups of bacteria that possess species-like properties. One major challenge associated with species delineations is that not all shared genes have the same evolutionary history, and thus the choice of loci can have a major impact on phylogenetic reconstruction. Sequencing the genomes of large numbers of closely related strains provides new opportunities to distinguish ancestral from acquired alleles and assess the effects of recombination on phylogenetic inference. Here we analyzed the genomes of 119 strains of the marine actinomycete genus Salinispora, which is currently comprised of three named species that share 99% 16S rRNA gene sequence identity. While 63% of the core genome showed evidence of recombination, this had no effect on species-level phylogenomic resolution. Recombination did however blur intra-species relationships and biogeographic resolution. The genome-wide average nucleotide identity provided a new perspective on Salinispora diversity, revealing as many as seven new species. Patterns of orthologous group distributions reveal a genetic basis to delineation the candidate taxa and insight into the levels of genetic cohesion associated with bacterial species.

Notas

Indexación: Web of Science; Scopus.

Palabras clave

ACTINOMYCETE GENUS SALINISPORA, HOMOLOGOUS RECOMBINATION, SP NOV., DIVERSITY, STREPTOMYCES, REVEALS, RESISTANCE, EVOLUTION, GENOMICS, PACIFICA

Citación

Scientific Reports. Volume 7, Issue 1, 1 December 2017, Article number 3564

URI

http://repositorio.unab.cl/xmlui/handle/ria/4742

Colecciones

Fac.CV - Artículos de Revista

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