Evidence map›Paper›PMID 33639933›Full record

ArticleBMC medical genomics2021

Methylenetetrahydrofolate reductase gene polymorphism, global DNA methylation and blood pressure: a population based study from North India.

Suniti Yadav, Imnameren Longkumer, Shipra Joshi, Kallur Nava Saraswathy

Open access · goldAbstract read
In one paragraph

Article in BMC medical genomics, 2021. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 13 papers, 1 of them a synthesis that pooled it.

0numbers the graph read from it
0cells of the map it votes in
13citing papers in PubMed, 1 pooled it
2.7field-weighted citation impact, top 10% of its field
1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

The trial behind it

Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.

Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.

3 · Its place in the literature

Who cites it

13 citing papers in PubMed, 1 synthesis or guideline pooled it, 19 citations in OpenAlex.

  1. Accelerated epigenetic age in hypertension: a systematic review and meta-analysis.Hypertension research : official journal of the Japanese Society of Hypertension · 2026
    Pooled it
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  11. Medical foods for lowering homocysteine in hypertensive patients.Journal of clinical hypertension (Greenwich, Conn.) · 2023
    Article
  12. [Association betweenZhongguo dang dai er ke za zhi = Chinese journal of contemporary pediatrics · 2022
    Article
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4 · The record

Corrections and comments

PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.

5 · Who and what money

Authors and funding

4 authors at 2 institutions in 1 country.

Suniti YadavIndian Council of Medical Research, New Delhi, 110029, India.
Imnameren LongkumerDepartment of Anthropology, University of Delhi, Delhi, 110007, India.
Shipra JoshiManbhum Ananda Ashram Nityananda Trust-MANT, Kolkata, West Bengal, 700078, India.
Kallur Nava SaraswathyDepartment of Anthropology, University of Delhi, Delhi, 110007, India. knsaraswathy@yahoo.com.
University of Delhi · INIndian Council of Medical Research · IN

Funding

Department of Biotechnology, Government of India BT/PR14378/MED/30/535/2010
6 · The paper itself

Abstract

backgroundHypertension is a complex disorder affected by gene-environment interactions. Methylenetetrahydrofolate reductase (MTHFR) gene is one of the genes in One Carbon Metabolic (OCM) pathway that affects both blood pressure and epigenetic phenomenon. MTHFR C677T gene polymorphism leads to reduced methylation capacity via increased homocysteine concentrations. Global DNA methylation (5mC%) also gets affected in conditions such as hypertension. However, no study is found to understand hypertension in terms of both genetics and epigenetics. The present study aims to understand the relation between methylation, MTHFR C677T gene polymorphism and hypertension. It also tries to understand relation (if any) between methylation and anti-hypertensive drugs.

methodsThis is a cross-sectional study where data were collected from a total of 1634 individuals of either sex in age group 35-65 years. Hypertensives (SBP ≥ 140 mm Hg and DBP ≥ 90 mm Hg) (on treatment/not on treatment) and absolute controls were 236 (cases) and 307 (controls), respectively. All the samples were subjected to MTHFR C677T gene polymorphism screening (PCR-RFLP) and global DNA methylation assay (ELISA based colorimetric assay). Results of both the analyses were obtained on 218 cases, 263 controls.

resultsMedian 5mC% was relatively lower among cases (p > 0.05) compared to controls, despite controlling for confounders (age, sex, smoking, alcohol, diet) (r

conclusionGlobal DNA hypomethylation seems to be associated with hypertension and antihypertensive drugs seem to improve methylation. Hypertensive individuals with TT genotype but not on medication are more likely to be prone to global DNA hypomethylation. Important precursors in OCM pathway include micronutrients such as vitamin B-12, B-9 and B-6; their nutritional interventions (either dietary or supplement) may serve as strategies to prevent hypertension at population level. However, more epidemiological-longitudinal studies are needed for further validation.

Indexed as

Blood PressureDNA MethylationHypertensionMethylenetetrahydrofolate Reductase (NADPH2)AdultAgedAntihypertensive AgentsCase-Control StudiesCross-Sectional StudiesFemaleHumansIndiaMaleMiddle AgedPolymorphism, Single NucleotideAntihypertensive AgentsMethylenetetrahydrofolate Reductase (NADPH2)MTHFR protein, humanEpigeneticsGlobal DNA methylationHypertensionMendelian populationMTHFR C677T gene polymorphism

Identifiers

PMID33639933
PMCPMC7912464
OpenAlexW3134421668

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Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.