Relationship between MTHFR, MTRR gene polymorphisms and H-type hypertension: a systematic review and meta-analysis

The relationship between methylenetetrahydrofolate reductase (MTHFR) and methionine synthase reductase (MTRR) gene polymorphisms and H-type hypertension susceptibility has been deeply analysed, but the conclusions are not consistent. Therefore, we carried out a meta-analysis aimed at assessing the relationship exactly. Six English databases (PubMed, Embase, EBSCO, ScienceDirect, Cochrane Library, and Web of Science) and four Chinese databases (China Biological Medicine, WanFang, China Science and Technology Journal, and China National Knowledge Infrastructure) were used for searching studies from inception to August 2023. MTHFR C677T/A1298C and MTRR A66G genetic polymorphisms were evaluated. A total of 24 papers were included in our research, including 3649 H-type hyperpietics, 2772 non-H-type hyperpietics, and 2149 healthy controls. Our analysis shows that MTHFR C677T polymorphism showed significant association with H-type hypertension in both healthy individuals and non-H-type hyperpietics (TT vs. CC: OR = 3.43, 95% CI = 2.48–4.75). Further subgroup analysis based on geography revealed that homocysteine levels in the southern Chinese population were more susceptible to MTHFR C677T polymorphism (<i>p</i> &lt; 0.05). However, there was no significant association in all genetic models for the polymorphisms of MTHFR A1298C and MTRR A66G. MTHFR C677T polymorphisms are associated with H-type hypertension in non-H-type hyperpietics and healthy individuals.