Abstract
Genome-wide association studies (GWAS) in adults have identified single nucleotide polymorphisms (SNPs) associated with systolic blood pressure (SBP), but it is unclear whether the findings apply in youth. Further, the role of body mass index (BMI) in these associations is understudied. Our objective was to determine whether BMI modifies genetic susceptibility to high SBP in young people. The sample comprised 714 participants of European ancestry recruited in 1999–2000 from 10 Montreal-area high schools for a longitudinal study. SBP was measured at ages 12, 15, 17, 24, and 30. Blood and saliva samples were collected at ages 14, 20, and 25. Two evidence-based genetic risk scores (GRS) were constructed based on GWAS results in adults: GRS22 used 22 SNPs and GRS182 added 160 additional SNPs to GRS22. Sex-specific associations between each GRS and repeated measures of SBP were estimated using linear mixed models including BMI and a GRS*BMI product term. GRS182 explained a greater proportion of SBP variance than GRS22, and a greater proportion in females than males. The associations increased monotonically with BMI values between 22 kg/m2 and 35 kg/m2. Results indicate that BMI modifies the association between a GRS and SBP levels from adolescence to adulthood.
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Data availability
The datasets generated during and/or analyzed during the current study are available from the corresponding author upon reasonable request. Access to NDIT data is open to any university-appointed or affiliated investigator upon successful completion of the application process. Masters, doctoral and postdoctoral students may apply through their primary supervisor. To gain access, applicants must complete a data access form available on our website (www.celphie.ca) and return it to the principal investigator (jennifer.oloughlin@umontreal.ca). The procedure to obtain access to NDIT data is described in O’Loughlin, J., Dugas, E. N., Brunet, J., DiFranza, J., Engert, J. C., Gervais, A., Gray-Donald, K., Karp, I., Low, N. C., Sabiston, C., Sylvestre, M. P., Tyndale, R. F., Auger, N., Belanger, M., Barnett, T., Chaiton, M., Chenoweth, M. J., Constantin, E., Contreras, G., Kakinami, L., Labbe, A., Maximova, K., McMillan, E., O’Loughlin, E. K., Pabayo, R., Roy-Gagnon, M. H., Tremblay, M., Wellman, R. J., Hulst, A., Paradis, G., 2015. Cohort Profile: The Nicotine Dependence in Teens (NDIT) Study. Int J Epidemiol. 44(5), 1537–1546. doi: 10.1093/ije/dyu135.
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Acknowledgements
The NDIT study was supported by the Canadian Cancer Society (grant numbers 010271, 017435, 704031) and the Canadian Institutes of Health Research (grant number 364471). MPS is supported by aa salary award from the Fonds de recherche du Québec-Santé. JOL held a Tier 1 Canada Research Chair from 2004–2021. TR is supported by the Fonds de recherche du Québec-Santé and Bureau de la Coopération Interuniversitaire doctoral scholarships. The authors thank the NDIT participants, their parents, and the schools that participated in the NDIT study.
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TR and TD are co-first authors and prepared the first draft of the manuscript under the supervision of MPS. TR conducted the literature review. TD performed the statistical analysis. JOL acquired the funding for the NDIT study, and JOL, MPS, SMW and JCE acquired the funding for the genetic data collection and analysis. TR, TD, JK, DG, FINM, SMW, JCE, HYC, JOL, and MPS contributed to the interpretation of the results and critically reviewed the manuscript. All authors have read and approved the submission of the manuscript.
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Riglea, T., Dessy, T., Kalubi, J. et al. Body mass index modifies genetic susceptibility to high systolic blood pressure in adolescents and young adults: results from an 18-year longitudinal study. J Hum Hypertens 39, 334–342 (2025). https://doi.org/10.1038/s41371-025-01003-x
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DOI: https://doi.org/10.1038/s41371-025-01003-x