TY - JOUR T1 - Dairy consumption, systolic blood pressure, and risk of hypertension: Mendelian randomization study. JF - BMJ Y1 - 2017 A1 - Ding, Ming A1 - Huang, Tao A1 - Bergholdt, Helle Km A1 - Nordestgaard, Børge G A1 - Ellervik, Christina A1 - Qi, Lu KW - Blood Pressure KW - Dairy Products KW - Feeding Behavior KW - Genetic Predisposition to Disease KW - Humans KW - Hypertension KW - Lactase KW - Mendelian Randomization Analysis KW - Observational Studies as Topic KW - Polymorphism, Single Nucleotide KW - Randomized Controlled Trials as Topic AB -

Objective To examine whether previous observed inverse associations of dairy intake with systolic blood pressure and risk of hypertension were causal.Design Mendelian randomization study using the single nucleotide polymorphism rs4988235 related to lactase persistence as an instrumental variable.Setting CHARGE (Cohorts for Heart and Aging Research in Genomic Epidemiology) Consortium.Participants Data from 22 studies with 171 213 participants, and an additional 10 published prospective studies with 26 119 participants included in the observational analysis.Main outcome measures The instrumental variable estimation was conducted using the ratio of coefficients approach. Using meta-analysis, an additional eight published randomized clinical trials on the association of dairy consumption with systolic blood pressure were summarized.Results Compared with the CC genotype (CC is associated with complete lactase deficiency), the CT/TT genotype (TT is associated with lactose persistence, and CT is associated with certain lactase deficiency) of LCT-13910 (lactase persistence gene) rs4988235 was associated with higher dairy consumption (0.23 (about 55 g/day), 95% confidence interval 0.17 to 0.29) serving/day; P<0.001) and was not associated with systolic blood pressure (0.31, 95% confidence interval -0.05 to 0.68 mm Hg; P=0.09) or risk of hypertension (odds ratio 1.01, 95% confidence interval 0.97 to 1.05; P=0.27). Using LCT-13910 rs4988235 as the instrumental variable, genetically determined dairy consumption was not associated with systolic blood pressure (β=1.35, 95% confidence interval -0.28 to 2.97 mm Hg for each serving/day) or risk of hypertension (odds ratio 1.04, 0.88 to 1.24). Moreover, meta-analysis of the published clinical trials showed that higher dairy intake has no significant effect on change in systolic blood pressure for interventions over one month to 12 months (intervention compared with control groups: β=-0.21, 95% confidence interval -0.98 to 0.57 mm Hg). In observational analysis, each serving/day increase in dairy consumption was associated with -0.11 (95% confidence interval -0.20 to -0.02 mm Hg; P=0.02) lower systolic blood pressure but not risk of hypertension (odds ratio 0.98, 0.97 to 1.00; P=0.11).Conclusion The weak inverse association between dairy intake and systolic blood pressure in observational studies was not supported by a comprehensive instrumental variable analysis and systematic review of existing clinical trials.

VL - 356 ER - TY - JOUR T1 - Assessment of the Relationship Between Genetic Determinants of Thyroid Function and Atrial Fibrillation: A Mendelian Randomization Study. JF - JAMA Cardiol Y1 - 2019 A1 - Ellervik, Christina A1 - Roselli, Carolina A1 - Christophersen, Ingrid E A1 - Alonso, Alvaro A1 - Pietzner, Maik A1 - Sitlani, Collen M A1 - Trompet, Stella A1 - Arking, Dan E A1 - Geelhoed, Bastiaan A1 - Guo, Xiuqing A1 - Kleber, Marcus E A1 - Lin, Henry J A1 - Lin, Honghuang A1 - Macfarlane, Peter A1 - Selvin, Elizabeth A1 - Shaffer, Christian A1 - Smith, Albert V A1 - Verweij, Niek A1 - Weiss, Stefan A1 - Cappola, Anne R A1 - Dörr, Marcus A1 - Gudnason, Vilmundur A1 - Heckbert, Susan A1 - Mooijaart, Simon A1 - März, Winfried A1 - Psaty, Bruce M A1 - Ridker, Paul M A1 - Roden, Dan A1 - Stott, David J A1 - Völzke, Henry A1 - Benjamin, Emelia J A1 - Delgado, Graciela A1 - Ellinor, Patrick A1 - Homuth, Georg A1 - Köttgen, Anna A1 - Jukema, Johan W A1 - Lubitz, Steven A A1 - Mora, Samia A1 - Rienstra, Michiel A1 - Rotter, Jerome I A1 - Shoemaker, M Benjamin A1 - Sotoodehnia, Nona A1 - Taylor, Kent D A1 - van der Harst, Pim A1 - Albert, Christine M A1 - Chasman, Daniel I AB -

Importance: Increased free thyroxine (FT4) and decreased thyrotropin are associated with increased risk of atrial fibrillation (AF) in observational studies, but direct involvement is unclear.

Objective: To evaluate the potential direct involvement of thyroid traits on AF.

Design, Setting, and Participants: Study-level mendelian randomization (MR) included 11 studies, and summary-level MR included 55 114 AF cases and 482 295 referents, all of European ancestry.

Exposures: Genomewide significant variants were used as instruments for standardized FT4 and thyrotropin levels within the reference range, standardized triiodothyronine (FT3):FT4 ratio, hypothyroidism, standardized thyroid peroxidase antibody levels, and hyperthyroidism. Mendelian randomization used genetic risk scores in study-level analysis or individual single-nucleotide polymorphisms in 2-sample MR for the summary-level data.

Main Outcomes and Measures: Prevalent and incident AF.

Results: The study-level analysis included 7679 individuals with AF and 49 233 referents (mean age [standard error], 62 [3] years; 15 859 men [29.7%]). In study-level random-effects meta-analysis, the pooled hazard ratio of FT4 levels (nanograms per deciliter) for incident AF was 1.55 (95% CI, 1.09-2.20; P = .02; I2 = 76%) and the pooled odds ratio (OR) for prevalent AF was 2.80 (95% CI, 1.41-5.54; P = .003; I2 = 64%) in multivariable-adjusted analyses. The FT4 genetic risk score was associated with an increase in FT4 by 0.082 SD (standard error, 0.007; P < .001) but not with incident AF (risk ratio, 0.84; 95% CI, 0.62-1.14; P = .27) or prevalent AF (OR, 1.32; 95% CI, 0.64-2.73; P = .46). Similarly, in summary-level inverse-variance weighted random-effects MR, gene-based FT4 within the reference range was not associated with AF (OR, 1.01; 95% CI, 0.89-1.14; P = .88). However, gene-based increased FT3:FT4 ratio, increased thyrotropin within the reference range, and hypothyroidism were associated with AF with inverse-variance weighted random-effects OR of 1.33 (95% CI, 1.08-1.63; P = .006), 0.88 (95% CI, 0.84-0.92; P < .001), and 0.94 (95% CI, 0.90-0.99; P = .009), respectively, and robust to tests of horizontal pleiotropy. However, the subset of hypothyroidism single-nucleotide polymorphisms involved in autoimmunity and thyroid peroxidase antibodies levels were not associated with AF. Gene-based hyperthyroidism was associated with AF with MR-Egger OR of 1.31 (95% CI, 1.05-1.63; P = .02) with evidence of horizontal pleiotropy (P = .045).

Conclusions and Relevance: Genetically increased FT3:FT4 ratio and hyperthyroidism, but not FT4 within the reference range, were associated with increased AF, and increased thyrotropin within the reference range and hypothyroidism were associated with decreased AF, supporting a pathway involving the pituitary-thyroid-cardiac axis.

ER - TY - JOUR T1 - Mendelian randomization analysis does not support causal associations of birth weight with hypertension risk and blood pressure in adulthood. JF - Eur J Epidemiol Y1 - 2020 A1 - Zheng, Yan A1 - Huang, Tao A1 - Wang, Tiange A1 - Mei, Zhendong A1 - Sun, Zhonghan A1 - Zhang, Tao A1 - Ellervik, Christina A1 - Chai, Jin-Fang A1 - Sim, Xueling A1 - van Dam, Rob M A1 - Tai, E-Shyong A1 - Koh, Woon-Puay A1 - Dorajoo, Rajkumar A1 - Saw, Seang-Mei A1 - Sabanayagam, Charumathi A1 - Wong, Tien Yin A1 - Gupta, Preeti A1 - Rossing, Peter A1 - Ahluwalia, Tarunveer S A1 - Vinding, Rebecca K A1 - Bisgaard, Hans A1 - Bønnelykke, Klaus A1 - Wang, Yujie A1 - Graff, Mariaelisa A1 - Voortman, Trudy A1 - van Rooij, Frank J A A1 - Hofman, Albert A1 - van Heemst, Diana A1 - Noordam, Raymond A1 - Estampador, Angela C A1 - Varga, Tibor V A1 - Enzenbach, Cornelia A1 - Scholz, Markus A1 - Thiery, Joachim A1 - Burkhardt, Ralph A1 - Orho-Melander, Marju A1 - Schulz, Christina-Alexandra A1 - Ericson, Ulrika A1 - Sonestedt, Emily A1 - Kubo, Michiaki A1 - Akiyama, Masato A1 - Zhou, Ang A1 - Kilpeläinen, Tuomas O A1 - Hansen, Torben A1 - Kleber, Marcus E A1 - Delgado, Graciela A1 - McCarthy, Mark A1 - Lemaitre, Rozenn N A1 - Felix, Janine F A1 - Jaddoe, Vincent W V A1 - Wu, Ying A1 - Mohlke, Karen L A1 - Lehtimäki, Terho A1 - Wang, Carol A A1 - Pennell, Craig E A1 - Schunkert, Heribert A1 - Kessler, Thorsten A1 - Zeng, Lingyao A1 - Willenborg, Christina A1 - Peters, Annette A1 - Lieb, Wolfgang A1 - Grote, Veit A1 - Rzehak, Peter A1 - Koletzko, Berthold A1 - Erdmann, Jeanette A1 - Munz, Matthias A1 - Wu, Tangchun A1 - He, Meian A1 - Yu, Caizheng A1 - Lecoeur, Cécile A1 - Froguel, Philippe A1 - Corella, Dolores A1 - Moreno, Luis A A1 - Lai, Chao-Qiang A1 - Pitkänen, Niina A1 - Boreham, Colin A A1 - Ridker, Paul M A1 - Rosendaal, Frits R A1 - de Mutsert, Renée A1 - Power, Chris A1 - Paternoster, Lavinia A1 - Sørensen, Thorkild I A A1 - Tjønneland, Anne A1 - Overvad, Kim A1 - Djoussé, Luc A1 - Rivadeneira, Fernando A1 - Lee, Nanette R A1 - Raitakari, Olli T A1 - Kähönen, Mika A1 - Viikari, Jorma A1 - Langhendries, Jean-Paul A1 - Escribano, Joaquin A1 - Verduci, Elvira A1 - Dedoussis, George A1 - König, Inke A1 - Balkau, Beverley A1 - Coltell, Oscar A1 - Dallongeville, Jean A1 - Meirhaeghe, Aline A1 - Amouyel, Philippe A1 - Gottrand, Frédéric A1 - Pahkala, Katja A1 - Niinikoski, Harri A1 - Hyppönen, Elina A1 - März, Winfried A1 - Mackey, David A A1 - Gruszfeld, Dariusz A1 - Tucker, Katherine L A1 - Fumeron, Frédéric A1 - Estruch, Ramon A1 - Ordovas, Jose M A1 - Arnett, Donna K A1 - Mook-Kanamori, Dennis O A1 - Mozaffarian, Dariush A1 - Psaty, Bruce M A1 - North, Kari E A1 - Chasman, Daniel I A1 - Qi, Lu AB -

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.

VL - 35 IS - 7 ER - TY - JOUR T1 - Genetic architecture of spatial electrical biomarkers for cardiac arrhythmia and relationship with cardiovascular disease. JF - Nat Commun Y1 - 2023 A1 - Young, William J A1 - Haessler, Jeffrey A1 - Benjamins, Jan-Walter A1 - Repetto, Linda A1 - Yao, Jie A1 - Isaacs, Aaron A1 - Harper, Andrew R A1 - Ramirez, Julia A1 - Garnier, Sophie A1 - Van Duijvenboden, Stefan A1 - Baldassari, Antoine R A1 - Concas, Maria Pina A1 - Duong, ThuyVy A1 - Foco, Luisa A1 - Isaksen, Jonas L A1 - Mei, Hao A1 - Noordam, Raymond A1 - Nursyifa, Casia A1 - Richmond, Anne A1 - Santolalla, Meddly L A1 - Sitlani, Colleen M A1 - Soroush, Negin A1 - Thériault, Sébastien A1 - Trompet, Stella A1 - Aeschbacher, Stefanie A1 - Ahmadizar, Fariba A1 - Alonso, Alvaro A1 - Brody, Jennifer A A1 - Campbell, Archie A1 - Correa, Adolfo A1 - Darbar, Dawood A1 - De Luca, Antonio A1 - Deleuze, Jean-Francois A1 - Ellervik, Christina A1 - Fuchsberger, Christian A1 - Goel, Anuj A1 - Grace, Christopher A1 - Guo, Xiuqing A1 - Hansen, Torben A1 - Heckbert, Susan R A1 - Jackson, Rebecca D A1 - Kors, Jan A A1 - Lima-Costa, Maria Fernanda A1 - Linneberg, Allan A1 - Macfarlane, Peter W A1 - Morrison, Alanna C A1 - Navarro, Pau A1 - Porteous, David J A1 - Pramstaller, Peter P A1 - Reiner, Alexander P A1 - Risch, Lorenz A1 - Schotten, Ulrich A1 - Shen, Xia A1 - Sinagra, Gianfranco A1 - Soliman, Elsayed Z A1 - Stoll, Monika A1 - Tarazona-Santos, Eduardo A1 - Tinker, Andrew A1 - Trajanoska, Katerina A1 - Villard, Eric A1 - Warren, Helen R A1 - Whitsel, Eric A A1 - Wiggins, Kerri L A1 - Arking, Dan E A1 - Avery, Christy L A1 - Conen, David A1 - Girotto, Giorgia A1 - Grarup, Niels A1 - Hayward, Caroline A1 - Jukema, J Wouter A1 - Mook-Kanamori, Dennis O A1 - Olesen, Morten Salling A1 - Padmanabhan, Sandosh A1 - Psaty, Bruce M A1 - Pattaro, Cristian A1 - Ribeiro, Antonio Luiz P A1 - Rotter, Jerome I A1 - Stricker, Bruno H A1 - van der Harst, Pim A1 - van Duijn, Cornelia M A1 - Verweij, Niek A1 - Wilson, James G A1 - Orini, Michele A1 - Charron, Philippe A1 - Watkins, Hugh A1 - Kooperberg, Charles A1 - Lin, Henry J A1 - Wilson, James F A1 - Kanters, Jørgen K A1 - Sotoodehnia, Nona A1 - Mifsud, Borbala A1 - Lambiase, Pier D A1 - Tereshchenko, Larisa G A1 - Munroe, Patricia B KW - Arrhythmias, Cardiac KW - Atrioventricular Block KW - Biomarkers KW - Cardiovascular Diseases KW - Electrocardiography KW - Genome-Wide Association Study KW - Humans KW - Risk Factors AB -

The 3-dimensional spatial and 2-dimensional frontal QRS-T angles are measures derived from the vectorcardiogram. They are independent risk predictors for arrhythmia, but the underlying biology is unknown. Using multi-ancestry genome-wide association studies we identify 61 (58 previously unreported) loci for the spatial QRS-T angle (N = 118,780) and 11 for the frontal QRS-T angle (N = 159,715). Seven out of the 61 spatial QRS-T angle loci have not been reported for other electrocardiographic measures. Enrichments are observed in pathways related to cardiac and vascular development, muscle contraction, and hypertrophy. Pairwise genome-wide association studies with classical ECG traits identify shared genetic influences with PR interval and QRS duration. Phenome-wide scanning indicate associations with atrial fibrillation, atrioventricular block and arterial embolism and genetically determined QRS-T angle measures are associated with fascicular and bundle branch block (and also atrioventricular block for the frontal QRS-T angle). We identify potential biology involved in the QRS-T angle and their genetic relationships with cardiovascular traits and diseases, may inform future research and risk prediction.

VL - 14 IS - 1 ER -