Association between a microRNA binding site polymorphism in SLCO1A2 and the risk of delayed methotrexate elimination in Chinese children with acute lymphoblastic leukemia.
Organic anion-transporting polypeptide 1A2 (OATP1A2) is involved in the cellular uptake of methotrexate (MTX). Genetic variation in solute carrier organic anion transporter family member 1A2 (SLCO1A2, the coding gene of OATP1A2) has important implications for the elimination of MTX. We investigated the association between a microRNA (miRNA) binding site polymorphism (rs4149009 G > A) in the 3'-untranslated region (3'-UTR) of SLCO1A2 with the serum MTX concentrations in Chinese children with acute lymphoblastic leukemia (ALL). Genotyping for SLCO1A2 rs4149009 G > A in 141 children with ALL was performed using the Sequenom MassARRAY system. Serum MTX concentrations were determined by fluorescence polarization immunoassay. The percentages of MTX level ≥1 μmol/L at 42 h were compared among the AA, GA, and GG genotypes. The minor allele frequency observed in this study (33.0%) was significantly lower than that in the African samples reported in the 1000 Genomes Project (57.4%, P = 0.00). The incidence rate of delayed MTX elimination was significantly higher in patients with the GG genotype (23.1%) compared with the AA genotype (0.0%, P = 0.03). Bioinformatics tools predicted that the rs4149009 A allele would disrupt the putative binding sites of hsa-miR-324-3p and hsa-miR-1913. These results indicate that the rs4149009 G > A polymorphism might affect MTX pharmacokinetics by interfering with the function of miRNAs.
['Wang|Shu-Mei|SM|', 'Zeng|Wei-Xin|WX|', 'Wu|Wan-Shui|WS|', 'Sun|Lu-Lu|LL|', 'Yan|Dan|D|']
D020413:3' Untranslated Regions D000293:Adolescent D000483:Alleles D000964:Antimetabolites, Antineoplastic D044466:Asians D001665:Binding Sites D002648:Child D002675:Child, Preschool D002681:China D005260:Female D016231:Fluorescence Polarization Immunoassay D006801:Humans D008297:Male D008727:Methotrexate D035683:MicroRNAs D027361:Organic Anion Transporters D020641:Polymorphism, Single Nucleotide D054198:Precursor Cell Lymphoblastic Leukemia-Lymphoma D012189:Retrospective Studies D000075462:Serum Albumin, Human
MicroRNA Methotrexate Acute lymphoblastic leukemia Solute carrier organic anion transporter family member 1A2 Genetic polymorphism