Gut Microbiome & Hypertension: New Study Finds Link

A New Gut Microbiome Player Enters the Hypertension Field

Scientists analyzing the gut microbiomes of 246 people have identified a specific microbial signature linked to high blood pressure. The work, led by a team including Yuan and Liu, moves beyond the usual focus on bacteria. For the first time, it provides a large-scale analysis of gut archaea—a distinct, often overlooked domain of life—in individuals with hypertension. The researchers found people with hypertension have a notably less diverse and altered archaeal community, with specific methane-producing microbes substantially reduced.

Hypertension is Linked to a Loss of Methane-Producing Archaea

The study used fecal metagenomic data from two independent cohorts, totaling 83 healthy controls and 163 people with hypertension. While bacteria dominate most microbiome studies, the team extracted and analyzed archaeal DNA sequences.

They measured two key things: richness and community structure. The Chao1 index, a measure of richness, was significantly lower in the hypertension group (P = 0.0024). This indicates they had fewer different types of archaea in their guts. Furthermore, the overall composition or “structure” of the archaeal community was distinctly different between healthy and hypertensive individuals. Statistical analysis showed hypertension status was a major host factor driving this variation.

Methanobacteriota was the dominant archaeal phylum in both groups. However, looking at the species level revealed clear differences. Key methanogens—archaea that produce methane—were far less abundant in people with hypertension. The most depleted species were Methanobrevibacter_A_smithii, Methanosphaera_sp900322125, and Methanomassiliicoccus_A_sp905203995.

Remodeled Microbial Networks and a Powerful Diagnostic Signal

The implications of losing these specific archaea may extend beyond their simple absence. The team investigated the correlations between archaeal species and common clinical indicators. They found that hypertension changed these relationships. For example, the links between certain archaea and blood pressure or lipid parameters like triglycerides and LDL cholesterol were different in the hypertension group compared to healthy controls.

The researchers also mapped how archaea interact with each other and with bacteria. In hypertension, these cross-domain interaction networks were “markedly reshaped.” The loss of core methanogens likely disrupts a stable microbial ecosystem, potentially impacting metabolic functions that influence host physiology.

Using a machine learning approach called random forest, the team built a diagnostic model. The model used only the three core methanogenic species as features. Its performance was striking. In the combined cohort, it achieved an Area Under the Curve (AUC) of 0.945. Tested on the two individual cohorts, it maintained strong performance with AUCs of 0.858 and 0.999, suggesting gut archaeal signatures could serve as potent non-invasive biomarkers.

Cautious Interpretation and Future Directions

Yuan, Liu, and colleagues state their work provides “the first comprehensive characterization of gut archaeal dysbiosis in hypertension.” The consistent depletion of methanogens across cohorts and the powerful diagnostic model point to a robust signal worthy of deeper investigation.

However, this study has important limitations. As a preprint, it has not undergone peer review. The work is observational and cannot determine if the loss of archaea causes hypertension or is a consequence of it. The exact mechanistic role of these methanogens in blood pressure regulation remains unknown. It is also unclear if interventions like probiotics, prebiotics, or specific diets aimed at modifying archaeal populations could have therapeutic benefits.

The findings open a new avenue for research. Future studies must work to confirm these associations and explore the causal mechanisms. If the link holds, monitoring or modulating the gut archaeome could become a novel component of strategies aimed at promoting cardiovascular health and longevity.

Source:
Hypertension Associated Characteristics of Gut Archaea and Their Interaction Network with Bacteria (medRxiv preprint, 2026-04-27)