Fourteen Novel Single Nucleotide Polymorphisms in the SLC22A2 Gene Encoding Human Organic Cation Transporter (OCT2)

2004 ◽  
Vol 19 (3) ◽  
pp. 239-244 ◽  
Author(s):  
Hiromi fukushima-Uesaka ◽  
Keiko Maekawa ◽  
Shogo Ozawa ◽  
Kazuo Komamura ◽  
Kazuyuki Ueno ◽  
...  
Keyword(s):  
Single Nucleotide Polymorphisms ◽  
Organic Cation ◽  
Organic Cation Transporter ◽  
Nucleotide Polymorphisms ◽  
Gene Encoding ◽  
Single Nucleotide

scholarly journals Single nucleotide polymorphisms in the intergenic region between metformin transporter OCT2 and OCT3 coding genes are associated with short-term response to metformin monotherapy in type 2 diabetes mellitus patients

2016 ◽  
Vol 175 (6) ◽  
pp. 531-540 ◽  
Author(s):  
Linda Zaharenko ◽  
Ineta Kalnina ◽  
Kristine Geldnere ◽  
Ilze Konrade ◽  
Solveiga Grinberga ◽  
...  
Keyword(s):  
Type 2 Diabetes ◽  
Single Nucleotide Polymorphisms ◽  
Pharmacokinetic Study ◽  
Organic Cation ◽  
Organic Cation Transporter ◽  
Nucleotide Polymorphisms ◽  
Short Term ◽  
Single Nucleotide ◽  
Flanking Region

Objective(s) High variability in clinical response to metformin is often observed in type 2 diabetes (T2D) patients, and it highlights the need for identification of genetic components affecting the efficiency of metformin therapy. Aim of this observational study is to evaluate the role of tagSNPs (tagging single nucleotide polymorphisms) from genomic regions coding for six metformin transporter genes with respect to the short-term efficiency. Design 102 tagSNPs in 6 genes coding for metformin transporters were genotyped in the group of 102 T2D patients treated with metformin for 3 months. Methods Most significant hits were analyzed in the group of 131 T2D patients from Slovakia. Pharmacokinetic study in 25 healthy nondiabetic volunteers was conducted to investigate the effects of identified polymorphisms. Results In the discovery group of 102 patients, minor alleles of rs3119309, rs7757336 and rs2481030 were significantly nominally associated with metformin inefficiency (P = 1.9 × 10−6 to 8.1 × 10−6). Effects of rs2481030 and rs7757336 did not replicate in the group of 131 T2DM patients from Slovakia alone, whereas rs7757336 was significantly associated with a reduced metformin response in combined group. In pharmacokinetic study, group of individuals harboring risk alleles of rs7757336 and rs2481030 displayed significantly reduced AUC∞ of metformin in plasma. Conclusions For the first time, we have identified an association between the lack of metformin response and SNPs rs3119309 and rs7757336 located in the 5′ flanking region of the genes coding for Organic cation transporter 2 and rs2481030 located in the 5′ flanking region of Organic cation transporter 3 that was supported by the results of a pharmacokinetic study on 25 healthy volunteers.

scholarly journals Association of Single-Nucleotide Polymorphisms in DC-SIGN with Nasopharyngeal Carcinoma Susceptibility

2017 ◽  
Vol 2017 ◽  
pp. 1-6
Author(s):  
Sisi Li ◽  
Zhifang Lu ◽  
Mengwei Yao ◽  
Sisi Ning ◽  
Yuan Wu ◽  
...  
Keyword(s):  
Dendritic Cell ◽  
Nasopharyngeal Carcinoma ◽  
Single Nucleotide Polymorphisms ◽  
Odds Ratio ◽  
Chinese Population ◽  
Smoking History ◽  
Intercellular Adhesion Molecule ◽  
Nucleotide Polymorphisms ◽  
Gene Encoding ◽  
Single Nucleotide

The aim of this study was to explore potential relationships of four single-nucleotide polymorphisms (SNPs) in the gene encoding dendritic cell-specific intercellular adhesion molecule 3-grabbing nonintegrin (DC-SIGN) with risk of nasopharyngeal carcinoma (NPC). The DC-SIGN SNPs rs7252229, rs4804803, rs2287886, and rs735240 were genotyped in 477 unrelated NPC patients and 561 cancer-free controls. At rs7252229, risk of NPC was significantly lower in individuals with GC (odds ratio [OR] 0.076, 95% confidence interval [CI] 0.008–0.690), GG (OR 0.056, 95%CI 0.006–0.487), or GC + GG (OR 0.059, 95%CI 0.007–0.515) than in individuals with the CC genotype, after adjusting for age, gender, smoking history, and EBV-VCA-IgA status. At rs4804803, risk of NPC was significantly higher in individuals with the genotype GG than in those with the genotype AA (adjusted OR 9.038, 95%CI 1.708–47.822). At rs735240, risk of NPC did not change significantly with genotypes AG, GG, or AG + GG after adjusting for age, gender, and smoking history. However, when data were also adjusted for EBV-VCA-IgA status, three genotypes emerged as associated with significantly higher risk of NPC than the AA genotype: AG (OR 2.976, 95%CI 1.123–7.888), GG (OR 3.314, 95%CI 1.274–8.622), or GG + AG (OR 3.191, 95%CI 1.237–8.230). Our results suggest that DC-SIGN SNPs rs7252229, rs4804803, and rs735240 may influence NPC risk in the Chinese population. The mechanisms mediating this risk require a further study.

Human multidrug and toxin extrusion 1 (MATE1/SLC47A1) transporter: functional characterization, interaction with OCT2 (SLC22A2), and single nucleotide polymorphisms

2010 ◽  
Vol 298 (4) ◽  
pp. F997-F1005 ◽  
Author(s):  
Henriette E. Meyer zu Schwabedissen ◽  
Celine Verstuyft ◽  
Heyo K. Kroemer ◽  
Laurent Becquemont ◽  
Richard B. Kim
Keyword(s):  
Single Nucleotide Polymorphisms ◽  
Organic Cation ◽  
Expression System ◽  
Renal Elimination ◽  
Nucleotide Polymorphisms ◽  
Single Nucleotide ◽  
Transfected Cells ◽  
Cellular Accumulation ◽  
Renal Tubular Cells ◽  
Toxin Extrusion

renal elimination of a number of cationic compounds is thought to be mediated by the organic cation transporter 2 (OCT2, SLC22A2), a drug uptake transporter expressed at the basolateral domain of renal tubular cells. Recently, the key efflux transporter for the secretion organic cations was identified as an electroneutral H+/organic cation exchanger termed the multidrug and toxin extrusion (MATE)-type transporter 1 (MATE1, SLC47A1). The key goals of this study were to assess the interplay between the renal cationic transporters OCT2 and MATE1 and the functional assessment of genetic variation in human MATE1. First, the ability of various agents to interact with OCT2- or MATE1-mediated transport was determined using a recombinant vaccinia expression system. We were able to identify several drugs in clinical use with a divergent inhibitory capacity for these transporters. Subsequently, we further assessed the effect of those compounds on the cellular accumulation of shared substrates using OCT2 and MATE1 double-transfected cells. Consistent with data obtained using single transporter transfected cells, compounds that exhibited preferential inhibition of MATE1 such as rapamycin and mitoxantrone induced significant cellular accumulation of cationic substrates. We next assessed the functional relevance of MATE1 genetic polymorphisms. Significant loss of transport activity for metformin and tetraethylammonium was noted for two nonsynonymous single nucleotide polymorphisms (SNPs), c.404T>C (p.159T>M) and c.1012G>A (p.338V>A). The c.404T>C was only seen in Asian subjects with an allele frequency of 1%, and the c.1012G>A SNP was much more common, especially among those of African descent. In conclusion, we show that coordinate function of MATE1 with OCT2 likely contributes to the vectorial renal elimination of organic cationic drugs and that altered activity of MATE1, whether by drugs or polymorphisms, should be considered as an important determinant of renal cationic drug elimination.

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