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Mendelian randomization analysis does not support causal associations of birth weight with hypertension risk and blood pressure in adulthood.

Abstract：

:Epidemiology studies suggested that low birthweight was associated with a higher risk of hypertension in later life. However, little is known about the causality of such associations. In our study, we evaluated the causal association of low birthweight with adulthood hypertension following a standard analytic protocol using the study-level data of 183,433 participants from 60 studies (CHARGE-BIG consortium), as well as that with blood pressure using publicly available summary-level genome-wide association data from EGG consortium of 153,781 participants, ICBP consortium and UK Biobank cohort together of 757,601 participants. We used seven SNPs as the instrumental variable in the study-level analysis and 47 SNPs in the summary-level analysis. In the study-level analyses, decreased birthweight was associated with a higher risk of hypertension in adults (the odds ratio per 1 standard deviation (SD) lower birthweight, 1.22; 95% CI 1.16 to 1.28), while no association was found between genetically instrumented birthweight and hypertension risk (instrumental odds ratio for causal effect per 1 SD lower birthweight, 0.97; 95% CI 0.68 to 1.41). Such results were consistent with that from the summary-level analyses, where the genetically determined low birthweight was not associated with blood pressure measurements either. One SD lower genetically determined birthweight was not associated with systolic blood pressure (β = - 0.76, 95% CI - 2.45 to 1.08 mmHg), 0.06 mmHg lower diastolic blood pressure (β = - 0.06, 95% CI - 0.93 to 0.87 mmHg), or pulse pressure (β = - 0.65, 95% CI - 1.38 to 0.69 mmHg, all p > 0.05). Our findings suggest that the inverse association of birthweight with hypertension risk from observational studies was not supported by large Mendelian randomization analyses.

journal_name

Eur J Epidemiol

journal_title

European journal of epidemiology

authors

Zheng Y,Huang T,Wang T,Mei Z,Sun Z,Zhang T,Ellervik C,Chai JF,Sim X,van Dam RM,Tai ES,Koh WP,Dorajoo R,Saw SM,Sabanayagam C,Wong TY,Gupta P,Rossing P,Ahluwalia TS,Vinding RK,Bisgaard H,Bønnelykke K,Wang Y,Gr

doi

10.1007/s10654-020-00638-z

subject

Has Abstract

pub_date

2020-07-01 00:00:00

pages

685-697

issue

eissn

0393-2990

issn

1573-7284

pii

10.1007/s10654-020-00638-z

journal_volume

pub_type

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Mendelian randomization analysis does not support causal associations of birth weight with hypertension risk and blood pressure in adulthood.