Genetic association between human skin microbiota with vaginitis: a two-sample Mendelian randomization study.

Area of Science:

• Microbiome research
• Human genetics
• Reproductive health

Background:

• The human skin microbiome plays a role in various diseases.
• Understanding the skin microbiome's connection to vaginitis is crucial for reproductive health.

Purpose of the Study:

• To investigate the causal association between the human skin microbiome and vaginitis using a bidirectional Mendelian randomization approach.
• To identify specific skin microbial taxa associated with vaginitis risk.

Main Methods:

• A two-sample bidirectional Mendelian randomization study was conducted.
• Summary statistics from large genome-wide association studies for skin microbiota and vaginitis (FinnGen consortium) were utilized.
• Multiple statistical methods including Inverse Variance Weighted (IVW) and MR-Egger were employed.

Main Results:

• Several skin microbes showed a causal association with vaginitis risk.
• Staphylococcus hominis and Staphylococcus (dry state) at Dorsalforearm were associated with a protective effect against vaginitis.
• Micrococcus showed a trend towards increased vaginitis risk, while Anaerococcus and Veillonella were linked to lower risk.
• Bacilli and Staphylococcus at Antecubitalfossa (moist) were associated with increased vaginitis risk.

Conclusions:

• The study identified a causal relationship between seven human skin microbiota and vaginitis.
• Findings highlight the potential role of skin flora in the pathogenesis of vaginitis, offering insights into reproductive disease management.