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1. Liu  Y, Lai  Q, Dong  C, Sun  F, Wang  L, Li  G, Shao  Z,     ( 2013 )

Phylogenetic diversity of the Bacillus pumilus group and the marine ecotype revealed by multilocus sequence analysis.

PloS one 8 (11)
PMID : 24244618  :   DOI  :   10.1371/journal.pone.0080097     PMC  :   PMC3823796    
Abstract >>
Bacteria closely related to Bacillus pumilus cannot be distinguished from such other species as B. safensis, B. stratosphericus, B. altitudinis and B. aerophilus simply by 16S rRNA gene sequence. In this report, 76 marine strains were subjected to phylogenetic analysis based on 7 housekeeping genes to understand the phylogeny and biogeography in comparison with other origins. A phylogenetic tree based on the 7 housekeeping genes concatenated in the order of gyrB-rpoB-pycA-pyrE-mutL-aroE-trpB was constructed and compared with trees based on the single genes. All these trees exhibited a similar topology structure with small variations. Our 79 strains were divided into 6 groups from A to F; Group A was the largest and contained 49 strains close to B. altitudinis. Additional two large groups were presented by B. safensis and B. pumilus respectively. Among the housekeeping genes, gyrB and pyrE showed comparatively better resolution power and may serve as molecular markers to distinguish these closely related strains. Furthermore, a recombinant phylogenetic tree based on the gyrB gene and containing 73 terrestrial and our isolates was constructed to detect the relationship between marine and other sources. The tree clearly showed that the bacteria of marine origin were clustered together in all the large groups. In contrast, the cluster belonging to B. safensis was mainly composed of bacteria of terrestrial origin. Interestingly, nearly all the marine isolates were at the top of the tree, indicating the possibility of the recent divergence of this bacterial group in marine environments. We conclude that B. altitudinis bacteria are the most widely spread of the B. pumilus group in marine environments. In summary, this report provides the first evidence regarding the systematic evolution of this bacterial group, and knowledge of their phylogenetic diversity will help in the understanding of their ecological role and distribution in marine environments.
KeywordMeSH Terms
2.     ( 2012 )

Genome sequence of Bacillus sp. strain HYC-10, isolated from intestinal tract contents from a marine fish (Mugil cephalus).

Journal of bacteriology 194 (24)
PMID : 23209239  :   DOI  :   10.1128/JB.01920-12     PMC  :   PMC3510561     DOI  :   10.1128/JB.01920-12     PMC  :   PMC3510561    
Abstract >>
Bacillus sp. strain HYC-10 was isolated with intestinal tract content of a fish, Mugil cephalus, captured from the sea close to Xiamen Island, China. Here, we present the draft genome of strain HYC-10, which contains 3,611,918 bp with a G+C content of 41.30% and contains 3,687 protein-coding genes and 33 tRNA genes.
KeywordMeSH Terms
Genome, Bacterial
Genome, Bacterial

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