Changes in the predominant human Lactobacillus flora during in vitro fertilisation

• Background: Signature matching of nucleotide sequences in the V1 and V3 regions 16S rRNA genes using pyrosequencing technology is a powerful tool for typing vaginal Lactobacilli to the species level and has been used for investigating the vaginal microbial niche. Methods: This study has characterized the normal cultivable vaginal Lactobacillus flora at varying estradiol levels in plasma, the study comprised 17 patients undergoing ovarian stimulation for In Vitro Fertilization (IVF) treatment. The vaginal status of each participant was initially assessed as normal according to Amsel and Nugent criteria. Results: L. crispatus, L. gasseri and/or L. jensenii were present in 10of the patients throughout the study period, and little variation among these three species was encountered in individual patients. The flora of three women was dominated by L. delbrüeckii, L. rhamnosus or L. vaginalis. One woman exhibited a dominance of L. iners. The flora of the remaining three women were initially dominated by L. rhamnosus or L. reuteri, but as their estrogen levels rose, their flora composition altered, to become dominated by one of the three species most common in a normal, healthy vagina. Conclusion: Signature matching of nucleotide sequences in the V1 and V3 regions of 16S rRNA genes is a discriminative tool for the study of vaginal Lactobacilli and can be used to track the Lactobacillus flora under a variety of physiological conditions. © 2008 Jakobsson and Forsum, licensee BioMed Central Ltd.

Ämnesord

NATURVETENSKAP  -- Biologi -- Annan biologi (hsv//swe)

NATURAL SCIENCES  -- Biological Sciences -- Other Biological Topics (hsv//eng)

Nyckelord

Bacterial Proteins/genetics Bacterial Typing Techniques Base Sequence DNA

Bacterial/genetics DNA

Ribosomal/genetics Female *Fertilization in Vitro Humans Lactobacillus/genetics/*isolation & purification Molecular Sequence Data Polymerase Chain Reaction

MEDICINE

MEDICIN

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