title: [Species Diversity of Bifidobacteria in the Intestinal Microbiota Studied Using MALDI-TOF Mass-Spectrometry].
abstract: BACKGROUND
  The members of genus Bifidobacterium represent a significant part of intestinal microbiota in adults and predominate in infants. Species repertoire of the intestinal bifidobacteria is known to be subjected to major changes with age; however, many details of this process are still to be elucidated.
  
  
  OBJECTIVE
  Our aim was to study the diversity of intestinal bifidobacteria and changes of their qualitative and quantitative composition characteristics during the process of growing up using MALDI-TOF mass-spectrometric analysis ofpure bacterial cultures.
  
  
  METHODS
  A cross-sectional study of bifidobacteria in the intestinal microbiota was performed in 93 healthy people of the ages from 1 month to 57 years. Strains were identified using Microflex LT MALDI-TOF MS, the confirmation was performed by 16S rRNA gene fragment sequencing.
  
  
  RESULTS
  93% of isolated bifidobacterial strains were successfully identified using MALDI-TOF mass-spectrometry. At least two of the strains from each species were additionally identified by 16S rRNA gene fragment sequencing, in all of the cases the results were the same. It was shown that the total concentration of bifidobacteria decreases with age (p<0.001) as well as the frequency of isolation of Bifidobacterium bifidum (p=0.020) and Bifidobacterium breve (p<0.001), and the frequency of isolation of Bifidobacterium adolescentis, increases (p<0.001), representing the continuous process of transformation of microbiota.
  
  
  CONCLUSIONS
  The method of MALDI-TOF mass spectrometry demonstrated the ability to perform rapid and reliable identification of bifidobacteria that allowed the study of changes in the quantitative and qualitative characteristics of human microbiota in the process of growing up.
authors.forename: A V
authors.initials: AV
authors.lastname: Chaplin
authors.forename: A G
authors.initials: AG
authors.lastname: Brzhozovskii
authors.forename: T V
authors.initials: TV
authors.lastname: Parfenova
authors.forename: L I
authors.initials: LI
authors.lastname: Kafarskaia
authors.forename: N N
authors.initials: NN
authors.lastname: Volodin
authors.forename: A N
authors.initials: AN
authors.lastname: Shkoporov
authors.forename: E N
authors.initials: EN
authors.lastname: Ilina
authors.forename: B A
authors.initials: BA
authors.lastname: Efimov
mesh_terms: D000293:Adolescent; D000328:Adult; D001644:Bifidobacterium / Q000235:genetics* / Q000302:isolation & purification; D002648:Child; D002675:Child, Preschool; D003430:Cross-Sectional Studies; D005243:Feces / Q000382:microbiology; D005260:Female; D000069196:Gastrointestinal Microbiome / Q000235:genetics*; D006801:Humans; D007223:Infant; D007231:Infant, Newborn; D007422:Intestines / Q000382:microbiology*; D008297:Male; D064307:Microbiota / Q000235:genetics*; D008875:Middle Aged; D016133:Polymerase Chain Reaction / Q000379:methods; D012336:RNA, Ribosomal, 16S / Q000235:genetics*; D019032:Spectrometry, Mass, Matrix-Assisted Laser Desorption-Ionization / Q000379:methods*; D055815:Young Adult
chemical_list: D012336:RNA, Ribosomal, 16S