Sex-specific association between gut Faecalibacterium prausnitzii and hypertension in male individuals
In males from Xinjiang, F. prausnitzii abundance was negatively correlated with systolic blood pressure, with PAGln proposed as a potential mediating metabolite — no such association was detected in females.
| Outcome | Grade | Direction | Effect | Studies |
|---|---|---|---|---|
| F. prausnitzii–systolic blood pressure correlation in males | C | ▲ Favorable | negative correlation (exact r and 95% CI not reported in available text) | 1 |
| Sex-specificity of association (absent in females) | C | — Neutral | no significant correlation detected in females (exact values not reported) | 1 |
| PAGln mediation of F. prausnitzii–SBP relationship in males | C | — Insufficient | indirect effect via mediation analysis (proportion mediated and 95% CI not reported in available text) | 1 |
| Faecalibacterium as male-associated genus-level biomarker for hypertension (16S rRNA) | C | ▲ Favorable | identified as male-associated genus biomarker (effect size and 95% CI not reported in available text) | 1 |
| Consistency of finding across 16S rRNA and shotgun metagenomics | C | ▲ Favorable | replicated across two sequencing platforms within same cohort (quantitative agreement not reported) | 1 |
Context
Gut microbiota dysbiosis has been implicated in hypertension, but sex-specific microbial signatures remain poorly defined, especially in geographically and ethnically distinct populations. Most studies do not stratify by sex, potentially masking effect modifiers. This study applies a multi-omics approach to address this gap in a Xinjiang cohort.
What the study showed
F. prausnitzii showed a significant negative correlation with SBP specifically in males, consistently observed across both 16S rRNA and shotgun metagenomic datasets. This association was absent in females. Mediation analysis suggests PAGln partially mediates the F. prausnitzii–SBP relationship in males. No absolute SBP values per group, 95% CI for correlation coefficients, or standardized effect sizes for mediation were reported with sufficient precision in the provided text.
How it was done
Cross-sectional observational study with 200 participants from Xinjiang; triple-platform design: 16S rRNA sequencing (genus level), shotgun metagenomics (species level and functional annotation), and serum metabolomics. Statistical mediation analysis was applied to investigate PAGln's role in the F. prausnitzii–SBP relationship in males. No follow-up period (cross-sectional design).
Effect magnitude
The provided text does not report absolute correlation values with 95% CI or standardized effect sizes for the F. prausnitzii–SBP association or for PAGln-mediated effect; precise magnitude cannot be stated from available material.
Limitations
Cross-sectional design precludes causal inference; n=200 is insufficient for sex-stratified analyses with adequate statistical power. Xinjiang-specific population (ethnicity, diet, altitude) severely limits generalizability. No risk-of-bias tool applied (ROBINS-I would be appropriate for observational design). PAGln mediation is purely statistical and does not demonstrate a causal mechanism; residual confounders (diet, BMI, antihypertensive medications) cannot be excluded.
In clinical practice
This study does not support any clinical intervention based on F. prausnitzii or PAGln for hypertension management. Findings should be treated as hypothesis-generating, not as validated biomarkers. Sex stratification in microbiome–hypertension studies is methodologically warranted based on this and related work.
What is still missing
Longitudinal studies and RCTs are required to establish causality between F. prausnitzii, PAGln, and blood pressure in males. Replication in cohorts of different ethnicities and geographies is essential before any clinical translation.