Terriglobus saanensis sp. nov., an acidobacterium isolated from tundra soil.
ABSTRACT Two aerobic bacterial strains, designated SP1PR4(T) and SP1PR5, were isolated from tundra soil samples collected from Saana fjeld, North-western Finland (69° 03' N 20° 50' E). Cells of both strains were Gram-negative, non-motile rods. Phylogenetic analysis indicated that the strains belong to the genus Terriglobus in subdivision 1 of the phylum Acidobacteria. Strains SP1PR4(T) and SP1PR5 shared identical BOX and ERIC fingerprints and 99.7 % 16S rRNA gene similarity indicating that, together with their identical physiological features, these strains are members of the same species. The 16S rRNA gene sequence similarity of SP1PR4(T) and SP1PR5 with Terriglobus roseus DSM 18391(T) was 97.1 %. A low DNA-DNA hybridization value (<20 %) and rpoB gene sequence similarity (83.6 %) with T. roseus DSM 18391(T) indicated that the tundra soil isolates represent novel members of the genus Terriglobus. Strains SP1PR4(T) and SP1PR5 grew at pH 4.5-7.5 and 4-30 °C. Sugars were the preferred growth substrates. The major cellular fatty acids were iso-C(15 : 0), C(16 : 1)ω7c, iso-C(13 : 0) and C(16 : 0). The DNA G+C content of strain SP1PR4(T) was 57.3 mol%. Based on phylogenetic, chemotaxonomic and physiological analyses, the name Terriglobus saanensis sp. nov. is proposed to accommodate the two strains; the type strain is SP1PR4(T) ( = DSM 23119(T) = ATCC BAA-1853(T)).
Article: A robust PCR primer design platform applied to the detection of Acidobacteria Group 1 in soil.[show abstract] [hide abstract]
ABSTRACT: Environmental biosurveillance and microbial ecology studies use PCR-based assays to detect and quantify microbial taxa and gene sequences within a complex background of microorganisms. However, the fragmentary nature and growing quantity of DNA-sequence data make group-specific assay design challenging. We solved this problem by developing a software platform that enables PCR-assay design at an unprecedented scale. As a demonstration, we developed quantitative PCR assays for a globally widespread, ecologically important bacterial group in soil, Acidobacteria Group 1. A total of 33,684 Acidobacteria 16S rRNA gene sequences were used for assay design. Following 1 week of computation on a 376-core cluster, 83 assays were obtained. We validated the specificity of the top three assays, collectively predicted to detect 42% of the Acidobacteria Group 1 sequences, by PCR amplification and sequencing of DNA from soil. Based on previous analyses of 16S rRNA gene sequencing, Acidobacteria Group 1 species were expected to decrease in response to elevated atmospheric CO(2). Quantitative PCR results, using the Acidobacteria Group 1-specific PCR assays, confirmed the expected decrease and provided higher statistical confidence than the 16S rRNA gene-sequencing data. These results demonstrate a powerful capacity to address previously intractable assay design challenges.Nucleic Acids Research 03/2012; 40(12):e96. · 8.03 Impact Factor