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. 2022 Apr;81(4):556-563.
doi: 10.1136/annrheumdis-2021-221635. Epub 2021 Dec 2.

Impact of adiposity on risk of female gout among those genetically predisposed: sex-specific prospective cohort study findings over >32 years

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Impact of adiposity on risk of female gout among those genetically predisposed: sex-specific prospective cohort study findings over >32 years

Natalie McCormick et al. Ann Rheum Dis. 2022 Apr.

Abstract

Objectives: To evaluate the joint (combined) association of excess adiposity and genetic predisposition with the risk of incident female gout, and compare to their male counterparts; and determine the proportion attributable to body mass index (BMI) only, genetic risk score (GRS) only, and to their interaction.

Methods: We prospectively investigated potential gene-BMI interactions in 18 244 women from the Nurses' Health Study and compared with 10 888 men from the Health Professionals Follow-Up Study. GRS for hyperuricaemia was derived from 114 common urate-associated single nucleotide polymorphisms.

Results: Multivariable relative risk (RR) for female gout was 1.49 (95% CI 1.42 to 1.56) per 5 kg/m2 increment of BMI and 1.43 (1.35 to 1.52) per SD increment in the GRS. For their joint association of BMI and GRS, RR was 2.18 (2.03 to 2.36), more than the sum of each individual factor, indicating significant interaction on an additive scale (p for interaction <0.001). The attributable proportions of joint effect for female gout were 42% (37% to 46%) to adiposity, 37% (32% to 42%) to genetic predisposition and 22% (16% to 28%) to their interaction. Additive interaction among men was smaller although still significant (p interaction 0.002, p for heterogeneity 0.04 between women and men), and attributable proportion of joint effect was 14% (6% to 22%).

Conclusions: While excess adiposity and genetic predisposition both are strongly associated with a higher risk of gout, the excess risk of both combined was higher than the sum of each, particularly among women.

Keywords: crystal arthropathies; epidemiology; gout.

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Conflict of interest statement

Competing interests: All authors have completed the ICMJE form for competing interests disclosure. NM, CY, NL and ADJ have no competing interests to declare. HC reports research support from Ironwood and Horizon, and consulting fees from Ironwood, Selecta, Horizon, Takeda, Kowa and Vaxart. GC reports research support from Decibel Therapeutics, consulting fees from AstraZeneca, Allena Pharmaceuticals, Shire/Takeda, Dicerna and Orfan, and is the Chief Medical Officer at OM1.

Figures

1.
1.. Joint Association of Body Mass Index (BMI) and Genetic Predisposition on the Risk of Incident Gout.
GRS=genetic risk score; HPFS=Health Professionals Follow-Up Study; NHS=Nurses Health Study; NHS II=Nurses Health Study II. Normal weight = BMI <25 kg/m2; Overweight = 30<BMI ≥ 25 kg/m2; Obese = BMI ≥30 kg/m2
2.
2.. Joint Association of Body Mass Index (BMI) and Genetic Risk Score (GRS) on the Risk of Incident Gout.
HPFS=Health Professionals Follow-Up Study; NHS=Nurses Health Study; NHS II=Nurses Health Study II; SD=standard deviation. The area of each coloured bar represents the proportion of the excess risk of incident gout attributable to each individual exposure (BMI and GRS) and to their joint effects.

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