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Oslo, Norway

Avershina E.,University of Life science | Lundgard K.,University of Life science | Sekelja M.,University of Life science | Sekelja M.,Genetic Analysis AS | And 5 more authors.
Environmental Microbiology | Year: 2016

Transition from an infant to an adult associated gut microbiota with age through establishment of strict anaerobic bacteria remains one of the key unresolved questions in gut microbial ecology. Here a comprehensive comparative analysis of stool microbiota in a large cohort of mothers and their children sampled longitudinally up until 2 years of age using sequencing analysis tool was presented that allows realistic microbial diversity estimates. In this work, evidence for the switch from children to adult associated microbial profile between 1 and 2 years of age was provided, suggestively driven by Bifidobacterium breve. An Operational Taxonomic Unit (OTU) belonging to B. breve was highly prevalent in the population throughout the first year of life, and was negatively associated with detection of a range of adult-like OTUs. Although an adult profile was not fully established by 2 years of age, it was demonstrated that with regards to the most prevalent OTUs, their prevalence in the child population by then already resembled that of the adult population. Taken together, it was proposed that late-colonizing OTUs were recruited at a later stage and were not acquired at birth with the recruitment being controlled by gatekeeping OTUs until the age of 1 year. © 2016 Society for Applied Microbiology and John Wiley & Sons Ltd Source


Rudi K.,Norwegian University of Life Sciences | Sekelja M.,Genetic Analysis AS
FEMS Microbiology Letters | Year: 2013

Ribosomal RNA (rRNA) genes are universal for all living organisms. Yet, the correspondence between genome composition and rRNA phylogeny remains poorly known. The aim of this study was to use the information from genome sequence databases to address the correlation between rRNA gene phylogeny and total gene composition in bacteria. This was done by analysing 327 genomes with TIGRFAM functional gene annotations. Our approach consisted of two steps. First, we searched for discriminatory clusters of co-occurring genes. Using a multivariate statistical approach, we identified 11 such clusters which contain genes that were co-occurring only in a subset of genomes and contributed to explain the gene content differences between genome subsets. Second, we mapped the discovered clusters to 16S rRNA-based phylogeny and calculated the correlation between co-occuring genes and phylogeny. Six of the 11 clusters exhibited significant correlation with 16S rRNA gene phylogeny. The most distinct phylogenetic finding was a high correlation between iron-sulfur oxidoreductases in combination with carbon nitrogen ligases and Chlorobium. The other correlations identified covered relatively large phylogroups: Actinobacteria were positively associated with kinases, while Gammaproteobacteria were positively associated with methylases and acyltransferases. The suggested functional differences between higher phylogroups, however, need experimental verification. © 2012 Federation of European Microbiological Societies. Source


Patent
Genetic Analysis As | Date: 2015-11-18

Described herein is a set of oligonucleotide probes. Also included are methods of using the oligonucleotide probes in profiling the microbiota of the GI tract of a subject and methods of diagnosing or monitoring a disease or condition in a subject or predicting or assessing the risk of a subject developing a disease or condition. Kits comprising the oligonucleotide probe set described herein are also provided


Patent
Genetic Analysis As | Date: 2010-11-03

Disclosed herein is a method of amplifying a target nucleotide sequence in 16S rRNA or in 16S rDNA that includes (a) contacting a sample comprising a 16S rDNA and/or the reverse transcription product of a 16S rRNA with an oligonucleotide primer comprising the nucleotide sequence of TCC TAC GGG AGG CAG CAG (SEQ ID NO 1) or a nucleotide sequence capable of hybridising under high stringency conditions to the sequence complementary to SEQ ID NO 1 and an oligonucleotide primer comprising the nucleotide sequence of CGG TTA CCT TGT TAC GAC TT (SEQ ID NO 2) or a nucleotide sequence capable of hybridising under high stringency conditions to the nucleotide sequence complementary to SEQ ID NO 2; and (b) performing a primer-dependent nucleic acid amplification reaction to amplify the target nucleotide sequence in the 16S rRNA or the 16S rDNA.


Patent
Genetic Analysis As | Date: 2013-06-17

Described herein is a set of oligonucleotide probes. Also included are methods of using the oligonucleotide probes in profiling the microbiota of the GI tract of a subject and methods of diagnosing or monitoring a disease or condition in a subject or predicting or assessing the risk of a subject developing a disease or condition. Kits comprising the oligonucleotide probe set described herein are also provided

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