Efficiency of PCR-based methods in discriminating Bifidobacterium longum ssp. longum and Bifidobacterium longum ssp. infantis strains of human origin

• Published in: Journal of microbiological methods 2011-10, Vol.87 (1), p.10-16
• Main Authors: Šrůtková, Dagmar, Španova, Alena, Špano, Miroslav, Dráb, Vladimír, Schwarzer, Martin, Kozaková, Hana, Rittich, Bohuslav
• Format: Article
• Language: English
• Subjects: Adult; adults; ARDRA; Bacteriological methods and techniques used in bacteriology; Bacteriology; Bifidobacterium - chemistry; Bifidobacterium - classification; Bifidobacterium - genetics; Bifidobacterium longum; Bifidobacterium longum subsp. infantis; Bifidobacterium longum subsp. longum; Biological and medical sciences; Breast Feeding; Cluster Analysis; DNA, Bacterial - chemistry; DNA, Bacterial - isolation & purification; feces; Feces - microbiology; fermentation; Fundamental and applied biological sciences. Psychology; gastrointestinal system; Humans; Infant; infants; melezitose; Microbiology; Molecular Typing - methods; PCR; Phylogeny; probiotics; Random Amplified Polymorphic DNA Technique; RAPD; rep-PCR; restriction endonucleases; Restriction Mapping; ribosomal DNA; RNA, Ribosomal, 16S - genetics
• ISSN: 0167-7012; 1872-8359
• DOI: 10.1016/j.mimet.2011.06.014

Bifidobacterium longum is considered to play an important role in health maintenance of the human gastrointestinal tract. Probiotic properties of bifidobacterial isolates are strictly strain-dependent and reliable methods for the identification and discrimination of this species at both subspecies and strain levels are thus required. Differentiation between B. longum ssp. longum and B. longum ssp. infantis is difficult due to high genomic similarities. In this study, four molecular-biological methods (species- and subspecies-specific PCRs, random amplified polymorphic DNA (RAPD) method using 5 primers, repetitive sequence-based (rep)-PCR with BOXA1R and (GTG) 5 primers and amplified ribosomal DNA restriction analysis (ARDRA)) and biochemical analysis, were compared for the classification of 30 B. longum strains (28 isolates and 2 collection strains) on subspecies level. Strains originally isolated from the faeces of breast-fed healthy infants (25) and healthy adults (3) showed a high degree of genetic homogeneity by PCR with subspecies-specific primers and rep-PCR. When analysed by RAPD, the strains formed many separate clusters without any potential for subspecies discrimination. These methods together with arabionose/melezitose fermentation analysis clearly differentiated only the collection strains into B. longum ssp. longum and B. longum ssp. infantis at the subspecies level. On the other hand, ARDRA analysis differentiated the strains into the B. longum/infantis subspecies using the cleavage analysis of genus-specific amplicon with just one enzyme, Sau3AI. According to our results the majority of the strains belong to the B. longum ssp. infantis (75%). Therefore we suggest ARDRA using Sau3AI restriction enzyme as the first method of choice for distinguishing between B. longum ssp. longum and B. longum ssp. infantis.