Summary
This genome-wide association meta-analysis of 271,040 European-ancestry individuals identified 259 novel genetic associations with TSH, 85 with FT4, and 62 with T3-related traits, substantially expanding knowledge of thyroid function genetics. Genetic correlation analyses distinguished between TSH-associated loci reflecting free T3-determined thyroid function and FT4 associations representing thyroid hormone metabolism. Mendelian randomization and polygenic risk score analyses revealed pleiotropic effects of genetically determined thyroid function variation on cardiovascular risk factors, autoimmune diseases, and cancer risk.
UK applicability
The study used European-ancestry populations and findings are directly applicable to the UK clinical and epidemiological context. Results may inform risk stratification and understanding of thyroid-related comorbidities in UK healthcare, though implementation would depend on validation in healthcare settings and consideration of ethnicity-specific effects.
Key measures
Genome-wide association signals for thyrotropin (TSH), free thyroxine (FT4), free and total triiodothyronine (T3), T3/FT4 ratio; heritability explained (TSH 14.1%, FT4 6.0%, total T3 9.5%, free T3 1.1%); polygenic risk scores; Mendelian randomization estimates
Outcomes reported
The study identified 259 novel genetic associations with TSH, 85 with FT4, and 62 with T3-related traits through genome-wide association meta-analysis in 271,040 individuals. It examined causal relationships between genetically determined thyroid function variation and clinical outcomes including cardiovascular disease, autoimmune conditions, and cancer.
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