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Interaction between polymorphisms in the OCT1 and MATE1 transporter and metformin response
Matthijs L Becker1, Loes E Visser, Ron H N van Schaik
1Department of Epidemiology, Erasmus MC, Rotterdam, The Netherlands.
Genetic variations in organic cation transporter 1 (OCT1) and multidrug and toxin extrusion 1 (MATE1) influence metformin's glucose-lowering effects. An interaction between OCT1 rs622342 and MATE1 rs2289669 polymorphisms significantly impacts metformin efficacy.
Area of Science:
- Pharmacogenomics
- Metabolic Diseases
- Drug Transporter Research
Background:
- Metformin, a first-line diabetes drug, is transported by OCT1 into and MATE1 out of hepatocytes.
- Genetic variations in SLC22A1 (OCT1) and SLC47A1 (MATE1) genes are linked to metformin's glucose-lowering efficacy.
Purpose of the Study:
- To investigate the interaction between OCT1 rs622342 and MATE1 rs2289669 polymorphisms.
- To determine if combined genotypes modify the glucose-lowering effect of metformin.
Main Methods:
- Analysis of incident metformin users from the population-based Rotterdam Study.
- Assessment of multiplicative interaction between OCT1 and MATE1 polymorphisms and changes in HbA1c levels in 98 participants.
Main Results:
- No association between MATE1 rs2289669 and HbA1c change in OCT1 rs622342 AA genotype carriers.
- A tendency towards association in AC genotype carriers and a significant association in CC genotype carriers.
- Statistically significant multiplicative interaction between the two polymorphisms (P=0.015).
Conclusions:
- The glucose-lowering effect of the MATE1 rs2289669 polymorphism is modulated by the OCT1 rs622342 genotype.
- Metformin efficacy is influenced by the combined genetic variations in OCT1 and MATE1.
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