Hypertension is the most prevalent modifiable risk factor for cardiovascular morbidity and mortality affecting more than 1.3 billion people worldwide . Given the burden of hypertension, any strategy that will improve blood pressure (BP) control will have major public health benefits . The causation of hypertension is multifactorial , influenced by a host of genetic and environmental factors, including poor diet, obesity, inactivity and smoking, in addition to interactions between these factors . The human microbiota comprises 10–100 trillion symbiotic microbial cells harboured by each person and is acquired from the environment starting at birth [4,5]. The gut microbiome, that is the community of microbes in the gastrointestinal tract, has been recently shown to be an important determinant of inflammation , obesity , type-2 diabetes  and arterial stiffness [9–11], all of which contribute to the risk of hypertension . Moreover, animal studies suggest that gut microbes may act on downstream cellular targets, directly contributing to the pathogenesis of hypertension [9,13]. Recently, human studies have identified lower gut microbiome diversity [13–16] and specific gut microbes associated with hypertension [17,18]. In a recent review on gut microbiome composition and hypertension, Verhaar et al.  indicated the negative role of Gram-negative microbiota, including Klebsiella, Parabacteroides, Desulfovibrio and Prevotella and the possible neutral/protective role of Ruminococcaceae, Roseburia and Faecalibacterium. Previous research into the gut microbial composition to hypertension also highlights the enrichment of Eubacterium, Lactobacillus, Megasphaera and Rothia, and the depletion of Bacteroides, Enterococcus, Oscillibacter. Moreover, a large study on 7928 individuals showed the periodontal microbiome, including Campylobacter rectus, Veillonella parvula and Prevotella melaninogenica, to be involved in BP regulation, suggesting the possible pro-hypertensive role of bacteria and bacterial products throughout the gastrointestinal tract and the mouth [21,22]. However, human studies are typically small and therefore underpowered, lack independent replication and there is a paucity of population-based evidence. Here, we first investigated the association between hypertension, and gut microbiome composition. We looked at the relationship between hypertension and the loss of microbiome composition and with specific genera in 871 people from TwinsUK. We then replicated our results in an independent population and further genomically characterise the hypertension-associated microbes using their 16s rRNA sequences.
MATERIALS AND METHODS
Design and study population
Study participants were female-unrelated individuals enrolled in the TwinsUK registry, a national register of adult twins recruited as volunteers without selecting for any particular disease or traits . Here, we analysed data from 871 unrelated women from TwinsUK . Twins provided informed written consent and the study was approved by St. Thomas’ Hospital Research Ethics Committee (REC Ref: EC04/015). Data relevant to our analysis includes BP, antihypertensive drug use, BMI, age and gut microbiome composition assessed using 16 s rRNA, as described below.
The replication cohort consisted of an independent sample of 448 women from the UK-based PREDICT 1 study with analogous data. The PREDICT-1 study  was a single-arm nutritional intervention conducted between June 2018 and May 2019. Study participants were healthy individuals (thus eliminating potential confounders brought about by the presence of infections or other comorbidities) aged between 18 and 65 years recruited from the TwinsUK registry , and the general population using online advertising. Participants attended a full day clinical visit consisting of test meal challenges followed by a 13-day home-based phase, as previously described .
Measurements and variables
BP was measured by a trained nurse using either the Marshall mb02, the Omron Mx3 or the Omron HEM713C Digital Blood Pressure Monitor (Omron Healthcare, Hoofddorp, Netherlands) performed with the patient in the sitting position for at least 3 min. At each visit, the cuff was placed on the individual's arm so that it was approximately 2–3 cm above the elbow joint of the inner arm, with the air tube lying over the brachial artery. The individual's arm was placed on the table or supported with the palm facing upwards, so that the tab of the cuff was placed at the same level of the heart. Triplicate measurements were taken with an interval of approximately 1 min between each reading, with mean of second and third measurements recorded.
Participants were classified into two groups based on their BP level, age and use of BP lowering drugs: hypertension cases (<60 years of age, with SBP ≥140 mmHg, or DBP ≥90 mmHg, or currently using antihypertensive drugs, or started using before 60 years); and controls (if age > 50 years, SBP ≤120 mmHg and DBP ≤80 mmHg, and not on BP-lowering medication, or if age ≤50, SBP ≤115 mmHg and DBP ≤80 mmHg and not on BP-lowering medication).
Gut microbiome composition
Gut microbiome composition was determined by 16S rRNA gene sequencing as previously described . Briefly, the V4 region of the 16S rRNA gene was amplified and sequenced on Illumina MiSeq. 16S sequences were demultiplexed in QIIME. Amplicon sequence variants (ASV) were then generated using the DADA2 package in R using the pipeline described elsewhere . Observed ASVs and beta diversities were computed using the R packages ‘vegan’  and ‘microbiome’ .
Statistical analysis was done using R 4.0.2 (R Foundation, Vienna, Austria).
We used general linear models with a quasi-Poisson distribution to investigate associations between observed ASVs and hypertension. The association between beta-diversity metrics and hypertension was assessed via MiRKAT tests . After grouping ASV at genus level, to identify taxa associated with hypertension, a generalized additive model for location, scale and shape (GAMLSS) fitted with the zero-inflated beta distribution (BEZI) was computed using the R package ‘gamlss’ . The GAMLSS-BEZI model is a two-component mixture model including a zero-model accounting for excess zeros and a count model to capture the remaining component by beta regression, allowing for overdispersion effects. The first component of this mixture model is linked by the nu parameter that models the probability at zero, the second component is indexed by the mu and sigma parameters, respectively, the mean and precision parameters. Likelihood-ratio tests between the null model (covariates only) and full models (covariates and hypertension) were performed (FDR < 0.01). We adjusted for age, age2, BMI and multiple testing using false discovery rate (FDR < 0.05).
We replicated significant genera (at P < 0.05) in PREDICT 1 and results were combined using an inverse variance random effect meta-analysis .
Genomic characterization of hypertension-associated microbes
All genomes isolated from the human gut belonging to the hypertension-associated microbes (Ruminiclostridium and the Erysipelotrichaceae) families were downloaded from the Unified Human Gastrointestinal Genome catalogue  [and RefSeq data set (January 2021) for the Erysipelotrichaceae family]. CheckM v1.1.3  was then ran using the ‘lineage_wf’ workflow to estimate genomic completeness and contamination. For Erysipelotrichaceae genera, we used high-quality genomes (<3% contamination, >95% completeness) of representative species. Whereas for the Faecalibacillus genus, we used the genomes of all existent species.
Evolutionary relationship of the Erysipelotrichaceae family
As Erysipelotrichaceae UCG003 was uncultured, we performed a genomic evolutionary analysis to investigate close relationships with other microbes. We predicted the 16S rRNA sequences of the representative Erysipelotrichaceae species using barrnap v0.9 (http://www.vicbioinformatics.com/software.barrnap.shtml). The predicted sequences together with the 16S rRNA sequence of Erysipelotrichaceae UCG-003 were then aligned using MUSCLE v3.8.1551 . From which, we estimated the maximum-likelihood phylogeny with PhyML v3  implemented in SeaView v5.0.4 , using the general time reversible (GTR) model of evolution, with optimized number of variant sites, nucleotide equilibrium frequencies and across site rate variation, and 100 bootstrap replicates. The constructed phylogenetic tree was then visualized using Interactive Tree Of Life (iTOL) . In addition, we queried the 16S rRNA sequence of Erysipelotrichaceae UCG-003 in the RDP classifier  and BLASTn . In BLASTn, the search was filtered by organism [Erysipelotrichaceae (taxid:128827)].
Prediction of the functional capabilities of Ruminiclostridium
To perform the functional analysis of Ruminiclostridium, we filtered genomes by a higher standard (>95% completeness, <1% contamination and <300 contigs). Missing sample accession numbers were obtained from the Sequence Read Archive (SRA) database of the NCBI, and the genomes from sample identifiers not found in the NCBI were discarded. Duplicated genomes were removed, keeping the genome with the highest N50 value. After filtering, we ran Prokka v1.12  in 565 remaining Ruminiclostridium genomes while specifying the genus (parameter --genus) to retrieve the gff files. Specifically, enzyme commission numbers were extracted to identify the Encyclopedia of Genes and Genomes (KEGG)  pathways using MiniPath (Minimal set of Pathways) (version: September 2020) . All the KEGG identifiers related to environmental information processing and organismal systems were removed. For each metabolic pathway, the number of genomes that presented such pathway was calculated.
We included 871 unrelated women (397 cases, 474 controls) from TwinsUK, aged 56 (±11.3) years and overweight, with an average BMI of 26 kg/m2 (±5) and we replicated our results in an independent sample of 448 women (57 cases, 391 controls) from the PREDICT-1 study, aged 44.8 (±12.1) with an average BMI of 25.1 kg/m2 (±5.1). Descriptive characteristics of the study populations are summarized in Table 1.
TABLE 1 -
Descriptive characteristics of TwinsUK and PREDICT1 samples
||TwinsUK (n = 871)
||PREDICT (n = 448)
||Cases (n = 397)
||Controls (n = 474)
||Cases (n = 57)
||Controls (n = 391)
In TwinsUK, after adjusting for confounders, we identify significantly lower observed ASVs in hypertensive individuals [Beta (95% CI) = −0.05 (−0.095 to −0.004), P = 0.03] (Fig. 1). When considering community microbial composition as measures of beta-diversity, significant differences were also detected for hypertension with binomial, Jaccard, weighted and unweighted-UniFrac diversity after multiple-testing (FDR < 0.05) (Figure S1, https://links.lww.com/HJH/B646). GAMLSS models adjusted for covariates and multiple testing (FDR < 0.05) identified abundances of 10 genera significantly different in hypertensive cases compared with controls (Figure S2, https://links.lww.com/HJH/B647). These included Coprococcus 3, Blautia, Dorea, Bifidobacterium, Erysipelotrichaceae UCG-003, Fusicatenibacter, Coprococcus 1, Ruminiclostridium 6, Subdoligranulum and Anaerostipes (Figure S2, https://links.lww.com/HJH/B647). As fibre intake is recognized to influence gut microbial composition, we re-run our analysis adjusting for nonstarch polysaccharide intake and results were consistent. We then assessed whether these associations were robust by testing for association of these 10 microbes in 448 independent women from the PREDICT-1 study. Out of those, two genera Ruminiclostridium 6 and Erysipelotrichacea UCG003 were nominally associated with hypertension (P < 0.05) in the replication cohort (Fig. 2). We then combined the results using inverse-variance random-effect meta-analysis [Fig. 2 (Ruminiclostridium 6 (meta-analysis, 95% CI = −0.31 −0.5 to −0.13, P = 1 × 10−3] Erysipelotrichacea UCG003 [meta-analysis (95% CI) = 0.46 (0.3–0.62), P = 1 × 10−4].
We then investigated the functional capacity of Ruminiclostridium by calculating the percentage of 16s Ruminiclostridium genomes that presented metabolic or genetic information processing KEGG pathways. This prediction of the functional capabilities of Ruminiclostridium revealed that this genus might be involved in 84 KEGG pathways, 83 of which relate to metabolism (Fig. 3), including lipid, amino acid, carbohydrate, cofactors and vitamin metabolism, among others (Fig. 3).
We then performed a genomic analysis to uncover the Erysipelotrichaceae genus’ evolution as it was uncultured. After constructing a maximum-likelihood phylogenetic tree using the 16S rRNA sequences of Erysipelotrichaceae UCG-003 and the different genera within the Erysipelotrichaceae family, we identify that Erysipelotrichaceae UCG-003 is closely related to existent species of the Faecalibacillus genus, namely, F. intestinalis, F. sp. H12 and F. faecis, sharing the most recent common ancestor (MRCA) (Fig. 4). To further interpret these results, we conducted a search using the 16S rRNA sequence of Erysipelotrichaceae UCG-003 as a query in the RDP classifier and in BLASTn search. The RDP classifier obtained a unique match to the Faecalibacillus genus with 100% identity. BLASTn search reported an E-value of 2 × 10−117, and a 100% identity and query and query cover with sequences from the species Faecalibacillus intestinalis and Faecalibacillus faecis.
In this large-scale human study investigating the association between gut microbiome composition and hypertension with an independent replication, we report that gut microbiome diversity is inversely associated with hypertension in women (Fig. 1, Figure S1, https://links.lww.com/HJH/B646). We also identify two genera, an uncultured genus of the Erysipelotrichaceae family, whose relative abundance is higher in hypertensive cases and that of Ruminiclostridium 6, whereby abundance was lower in hypertensive individuals (Fig. 2).
Functional annotation of Ruminiclostridium suggests its involvement in 84 pathways (Fig. 3), almost all of which related to pathways in metabolism. Moreover, the majority of the metabolic pathways were present in all genomic sequences (Fig. 3), implying a high homogeneity in the metabolic functional capabilities among the different species of Ruminiclostridium. A number of these pathways have been previously implicated in BP regulation. For instance, tryptophan biosynthesis and metabolism has been linked to SBP , while thiamine metabolism has also been correlated to hypotension in murine models  and thiamine supplement studies  (Fig. 3).
Through evolutionary analysis of the uncultured Erysipelotrichaceae genus, we identify a close relationship, and shared MRCA with F. sp. H12, F. faecis and F. intestinalis, species of Faecalibacillus (Fig. 4). Implying that Erysipelotrichaceae UCG-003 belongs to or has evolved from Faecalibacillus. Subsequent results obtained from the RDP classifier and BLASTn search support that Erysipelotrichaceae UCG-003 does in fact belong to Faecalibacillus with a 100% identity match and E-value of 2 × 10−117.
Faecalibacillus is a Gram-positive genus , first isolated from healthy South Korean subjects . Due to the novelty of this genus and lack of phenotypic characterization, it was not included in the latest SILVA database, from which we assigned taxonomic ranks [45,46].
Animal models and case studies of patients have shown that members of the Erysipelotrichaceae family are significantly increased in a number of inflammatory conditions , such as irritable bowel syndrome , colorectal cancer  and rheumatoid arthritis with anticitrullinated protein autoantibodies , suggesting a pro-inflammatory effect of this bacterial family on the host. Previous studies report an association between abundance of Erysipelotrichaceae family members and host lipidemic profile, particularly relating to cholesterol levels . However, after adjusting our analysis for levels of total cholesterol, the association between hypertension and Faecalibacillus remained statistically significant.
Our study has some limitations. Firstly, the study was based on middle-aged white female twins and hence may not be generalizable to other ethnic groups or to men. Although the characteristics of these women are representative of the general UK female population , clearly, studies in men and in other ethnic groups are needed. Secondly, the cross-sectional nature of our data does not allow us to infer causality. Third, although our genomic analysis highlights the functional capabilities of Ruminiclostridium, it does not provide information on which pathways are actually active. Therefore, more research is required to comprehensively understand the mechanisms by which Ruminiclostridium can influence hypertension. However, our study does benefits from our large sample size, facilitating the analysis of numerous microbes with sufficient power and an independent replication.
In conclusion, we find that gut microbiome diversity and composition are associated with hypertension. Our results suggest that targeting the microbiome may be a novel way to prevent or treat hypertension. Foremost, more research is necessary to further corroborate correlations between the gut microbiome and hypertension and provide insights into mechanistic capacity of the gut microbiome to control BP.
We thank all the participants of TwinsUK and PREDICT 1 for contributing and supporting our research.
The Department of Twin Research receives support from grants from the Wellcome Trust (212904/Z/18/Z) and the Medical Research Council (MRC)/British Heart Foundation (BHF) Ancestry and Biological Informative Markers for Stratification of Hypertension (AIM-HY; MR/M016560/1), European Union, Chronic Disease Research Foundation (CDRF), Zoe Global Ltd., the NIHR Clinical Research Facility and Biomedical Research Centre (based at Guy's and St Thomas’ NHS Foundation Trust in partnership with King's College London). C.M. is funded by the Chronic Disease Research Foundation and by the MRC AIM-HY project grant. P.L. and A.N. are funded by the Chronic Disease Research Foundation. AMV is funded by the Nottingham NIHR Biomedical Research Centre.
Funding for this study was provided by Chronic disease research foundation, ZOE global, Wellcome Trust, Medical Research Council, NIH, NIHR.
Conflicts of interest
T.D.S is co-founder of Zoe Global. A.M.V., F.A and N.S are consultants to Zoe Global. All other authors declare no competing financial interests.
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