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Browsing by Author "Wheeler, Caitlin"

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    Impact of donor CYP3A5 genotype on pharmacokinetics of tacrolimus in South African paediatric liver transplant patients
    (2024) Wheeler, Caitlin
    Tacrolimus is characterised by a narrow therapeutic target range and wide interpatient variability. Pharmacogenetic research attributes CYP3A5 single nucleotide polymorphisms to the variable inter-patient tacrolimus concentration dose ratios (CDR). In this study, we compared the mean tacrolimus CDR in paediatric liver transplant recipients and their living liver donors’ CYP3A5 rs776746 T>C genotypes(*1/*1, *1/*3 and *3/*3), accounting for donor and recipient characteristics. The graft-to-recipient weight ratio and the CYP3A5 donor genotypes were found to be independent factors significantly impacting the mean tacrolimus CDR. Donor CYP3A5 expressors (*1/*1 and *1/*3) were shown to have significantly lower recipient tacrolimus CDRs, therefore, higher dosages would be required in comparison to CYP3A5 non-expressors to reach the same therapeutic target range. The potential implementation of a stratified medicine dosage algorithm, combining living liver donor CYP3A5 genotyping with the calculation of the graft-to-recipient weight ratio, may predict the optimal tacrolimus dosage schedules for liver transplant recipients.

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