Vaginal Microbiome in Pregnant Women with and without Short Cervix

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Reviewed Marked as Reviewed by Svetlana up on 2024-6-12
study design
Citation
PMID PubMed identifier for scientific articles.
DOI Digital object identifier for electronic documents.
URI
Authors
Silvano A, Meriggi N, Renzi S, Seravalli V, Torcia MG, Cavalieri D, Di Tommaso M
Journal
Nutrients
Year
2023
Keywords:
Gardenerella vaginalis, Lactobacillus, aerobic vaginitis, microbiome, risk in pregnancy, shortened cervix
Cervical shortening is a recognised risk factor for pre-term birth. The vaginal microbiome plays an essential role in pregnancy and in maternal and foetal outcomes. We studied the vaginal microbiome in 68 women with singleton gestation and a cervical length ≤25 mm and in 29 pregnant women with a cervix >25 mm in the second or early third trimester. Illumina protocol 16S Metagenomic Sequencing Library Preparation was used to detail amplified 16SrRNA gene. Statistical analyses were performed in R environment. Firmicutes was the phylum most represented in all pregnant women. The mean relative abundance of Proteobacteria and Actinobacteriota was higher in women with a short cervix. Bacterial abundance was higher in women with a normal length cervix compared to the group of women with a short cervix. Nonetheless, a significant enrichment in bacterial taxa poorly represented in vaginal microbiome was observed in the group of women with a short cervix. Staphylococcus and Pseudomonas, taxa usually found in aerobic vaginitis, were more common in women with a short cervix compared with the control group, while Lactobacillus iners and Bifidobacterium were associated with a normal cervical length. Lactobacillus jensenii and Gardenerella vaginalis were associated with a short cervix.

Experiment 1


Reviewed Marked as Reviewed by Svetlana up on 2024-6-12

Curated date: 2024/04/06

Curator: Ayibatari

Revision editor(s): Ayibatari, Scholastica

Subjects

Location of subjects
Italy
Host species Species from which microbiome was sampled. Contact us to have more species added.
Homo sapiens
Body site Anatomical site where microbial samples were extracted from according to the Uber Anatomy Ontology
Vagina Vagina,vagina,Distal oviductal region,Distal portion of oviduct,Vaginae
Condition The experimental condition / phenotype studied according to the Experimental Factor Ontology
Cervix erosion cervix erosion,Erosion of cervix,erosion of cervix,Erosion of cervix (disorder),Uterine Cervical Erosion,Cervix erosion
Group 0 name Corresponds to the control (unexposed) group for case-control studies
Control
Group 1 name Corresponds to the case (exposed) group for case-control studies
Short Cervix Length
Group 1 definition Diagnostic criteria applied to define the specific condition / phenotype represented in the case (exposed) group
Pregnant women of predominantly Caucasian ethnicity with singleton gestation and a cervical length ≤ 25 mm in their second or early third trimester (23–32 weeks’ gestation)
Group 0 sample size Number of subjects in the control (unexposed) group
29
Group 1 sample size Number of subjects in the case (exposed) group
68
Antibiotics exclusion Number of days without antibiotics usage (if applicable) and other antibiotics-related criteria used to exclude participants (if any)
At the time of recruitment

Lab analysis

Sequencing type
16S
16S variable region One or more hypervariable region(s) of the bacterial 16S gene
V3-V4
Sequencing platform Manufacturer and experimental platform used for quantifying microbial abundance
Illumina

Statistical Analysis

Data transformation Data transformation applied to microbial abundance measurements prior to differential abundance testing (if any).
relative abundances
Statistical test
LEfSe
Significance threshold p-value or FDR threshold used for differential abundance testing (if any)
0.05
MHT correction Have statistical tests be corrected for multiple hypothesis testing (MHT)?
Yes
LDA Score above Threshold for the linear discriminant analysis (LDA) score for studies using the popular LEfSe tool
2

Alpha Diversity

Shannon Estimator of species richness and species evenness: more weight on species richness
unchanged
Simpson Estimator of species richness and species evenness: more weight on species evenness
unchanged
Richness Number of species
decreased

Signature 1

Reviewed Marked as Reviewed by Svetlana up on 2024-6-12

Curated date: 2024/04/06

Curator: Ayibatari

Revision editor(s): Ayibatari, Scholastica

Source: Figure 2a

Description: Linear discriminant analysis effect size (LEfSe) showing the significant taxonomic features in short cervix length versus control groups at different taxonomic levels

Abundance in Group 1: increased abundance in Short Cervix Length

NCBI Quality ControlLinks
Alphaproteobacteria
Brevundimonas
Caulobacteraceae
Caulobacterales
Corynebacteriaceae
Gammaproteobacteria
Lysobacteraceae
Lysobacterales
Mycobacteriales
Pseudomonadaceae
Pseudomonadales
Pseudomonadota
Pseudomonas
Pseudoxanthomonas
Staphylococcaceae
Staphylococcus
Tabrizicola
staphylococcalesstaphylococcales

Revision editor(s): Ayibatari, Scholastica

Signature 2

Reviewed Marked as Reviewed by Svetlana up on 2024-6-12

Curated date: 2024/06/12

Curator: Scholastica

Revision editor(s): Scholastica

Source: Figure 2a

Description: Linear discriminant analysis effect size (LEfSe) showing the significant taxonomic features in short cervix length versus control groups at different taxonomic levels

Abundance in Group 1: decreased abundance in Short Cervix Length

NCBI Quality ControlLinks
Paracoccaceae
Rhodobacterales
Actinomycetales
Actinomycetaceae
Clostridia
Paracoccus
Porphyromonas
Porphyromonadaceae
Micrococcales
Mobiluncus

Revision editor(s): Scholastica