Demonstrates quantitative drug-specific predictions of transporter variant effects, highlighting enhanced identification of clinically relevant variants.
) with experimental uptake than commonly used substrate-agnostic predictors. Application of SSEP on UK Biobank data revealed that OCT1 (SLC22A1) variant burden weighted by metformin-specific SSEP scores was significantly associated with maintenance dose (β = 30 mg/day per unit increase in predicted functional burden; p = 0.033), whereas substrate-agnostic weights showed no association (p = 0.78). Together, these results show that SSEP enables quantitative, drug-specific prediction of transporter variant effects, thereby improving the identification of clinically relevant transporter variants in population-scale data.
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Park et al. (2026) studied this question.
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