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PubMed2003

Sequence variations in the UDP-glucuronosyltransferase 2B7 (UGT2B7) gene: identification of 10 novel single nucleotide polymorphisms (SNPs) and analysis of their relevance to morphine glucuronidation in cancer patients.

We have screened a cohort of 239 Norwegian cancer patients for sequence variation in the coding and regulatory regions of the UDP-glucuronosyltransferase 2B7 gene (UGT2B7) and analyzed the impact of gene variants on morphine glucuronidation in vivo. In all, 12 single nucleotide polymorphisms (SNPs) were identified, 10 of which have not been previously described. Only one SNP causes a change in amino acid sequence (H268Y). Seven UGT2B7 genotypes were observed and three main haplotypes predicted. There was no correlation between UGT2B7 genotype or haplotype and morphine glucuronide to morphine serum ratios among 175 patients who received chronic oral morphine therapy, and who had normal renal and hepatic function. The apparent lack of functional polymorphisms fits well with the near unimodal, but broad, distributions of the ratios (morphine 3-glucuronide/morphine: 6.4-309.2; morphine 6-glucuronide/morphine: 0.5-72.8). Our results suggest that factors other than UGT2B7 polymorphism may be more deciding for the variability in morphine glucuronide to morphine serum ratios.

Adult↗
PubMed2004

Large-scale single-nucleotide polymorphism (SNP) and haplotype analyses, using dense SNP Maps, of 199 drug-related genes in 752 subjects: the analysis of the association between uncommon SNPs within haplotype blocks and the haplotypes constructed with haplotype-tagging SNPs.

To optimize the strategies for population-based pharmacogenetic studies, we extensively analyzed single-nucleotide polymorphisms (SNPs) and haplotypes in 199 drug-related genes, through use of 4,190 SNPs in 752 control subjects. Drug-related genes, like other genes, have a haplotype-block structure, and a few haplotype-tagging SNPs (htSNPs) could represent most of the major haplotypes constructed with common SNPs in a block. Because our data included 860 uncommon (frequency <0.1) SNPs with frequencies that were accurately estimated, we analyzed the relationship between haplotypes and uncommon SNPs within the blocks (549 SNPs). We inferred haplotype frequencies through use of the data from all htSNPs and one of the uncommon SNPs within a block and calculated four joint probabilities for the haplotypes. We show that, irrespective of the minor-allele frequency of an uncommon SNP, the majority (mean +/- SD frequency 0.943+/-0.117) of the minor alleles were assigned to a single haplotype tagged by htSNPs if the uncommon SNP was within the block. These results support the hypothesis that recombinations occur only infrequently within blocks. The proportion of a single haplotype tagged by htSNPs to which the minor alleles of an uncommon SNP were assigned was positively correlated with the minor-allele frequency when the frequency was <0.03 (P<.000001; n=233 [Spearman's rank correlation coefficient]). The results of simulation studies suggested that haplotype analysis using htSNPs may be useful in the detection of uncommon SNPs associated with phenotypes if the frequencies of the SNPs are higher in affected than in control populations, the SNPs are within the blocks, and the frequencies of the SNPs are >0.03.

Computational Biology↗
PubMed2004

Analysis of the type 2 diabetes-associated single nucleotide polymorphisms in the genes IRS1, KCNJ11, and PPARG2 in type 1 diabetes.

It has been proposed that type 1 and 2 diabetes might share common pathophysiological pathways and, to some extent, genetic background. However, to date there has been no convincing data to establish a molecular genetic link between them. We have genotyped three single nucleotide polymorphisms associated with type 2 diabetes in a large type 1 diabetic family collection of European descent: Gly972Arg in the insulin receptor substrate 1 (IRS1) gene, Glu23Lys in the potassium inwardly-rectifying channel gene (KCNJ11), and Pro12Ala in the peroxisome proliferative-activated receptor gamma2 gene (PPARG2). We were unable to confirm a recently published association of the IRS1 Gly972Arg variant with type 1 diabetes. Moreover, KCNJ11 Glu23Lys showed no association with type 1 diabetes (P > 0.05). However, the PPARG2 Pro12Ala variant showed evidence of association (RR 1.15, 95% CI 1.04-1.28, P = 0.008). Additional studies need to be conducted to confirm this result.

Adult↗
PubMed2006

Single nucleotide polymorphisms of PPARD in combination with the Gly482Ser substitution of PGC-1A and the Pro12Ala substitution of PPARG2 predict the conversion from impaired glucose tolerance to type 2 diabetes: the STOP-NIDDM trial.

Peroxisome proliferator-activated receptor (PPAR)-delta regulates fatty acid oxidation and improves insulin sensitivity. We screened six single nucleotide polymorphisms (SNPs) of the PPAR-delta gene (PPARD) for an association with the conversion from impaired glucose tolerance (IGT) to type 2 diabetes in 769 subjects participating in the STOP-NIDDM trial. A 2.7-fold increase in the risk of diabetes was observed in female carriers of the C allele of rs6902123 (95% CI 1.44-5.30; adjusted P = 0.002). In the placebo group, subjects possessing both the 482Ser allele of the PPAR-gamma coactivator-1alpha gene (PGC-1A) and the rare allele of two SNPs of PPARD (rs6902123 and rs3734254) had up to 2.5-fold increased risk for diabetes. Furthermore, women carrying the C allele of rs6902123 of PPARD and the Pro12Pro genotype of the PPAR-gamma2 gene (PPARG2) had a 3.9-fold (95% CI 1.79-8.63; P = 0.001)-higher risk for diabetes than women with protective genotypes. Expression levels of PPAR-delta in subcutaneous adipose tissue of 87 offspring of Finnish patients with type 2 diabetes did not differ among the genotype groups of SNPs of PPARD. We conclude that SNPs in PPARD modify the conversion from IGT to type 2 diabetes, particularly in combination with the SNPs of PGC-1A and PPARG2.

Amino Acid Substitution↗
PubMed2005

Single nucleotide polymorphism at codon 133 of the RASSF1 gene is preferentially associated with human lung adenocarcinoma risk.

The RASSF1 gene, a putative tumor suppressor gene located on human chromosome 3p21, garners much attention for the frequent allelic loss and gene silencing via promoter hypermethylation in a variety of human malignancies. An association between a single nucleotide polymorphism (SNP) at codon 133 of the RASSF1 gene, encoding either alanine (GCT) or serine (TCT), and human cancer risk remains undefined. We therefore, investigated the distribution of the Ala133Ser SNP in 101 patients with lung cancer, 63 with head and neck cancer, 72 with colorectal cancer, 56 with esophageal cancer and 110 healthy controls by polymerase chain reaction and restriction enzyme-digestion assay. The heterozygous Ala/Ser genotype was significantly more frequent in lung cancer patients than in healthy controls (P=0.028). The adjusted odds ratio (OR) for the patients with heterozygous Ala/Ser genotype as compared with the controls with the Ala/Ala genotype was 2.59 (95% confidence interval (CI); 1.11-6.04). The increased risk of the Ala/Ser genotype was found in lung cancer patients but not in other cancer patients we examined. The association was particularly strong in those lung cancer patients of male (adjusted OR; 3.33, 95% CI; 1.37-8.12), with adenocarcinoma (adjusted OR; 3.33, 95% CI; 1.36-8.15), early stages (adjusted OR; 3.42, 95% CI; 1.33-8.75) and with smoking habit (adjusted OR; 2.70, 95% CI; 1.06-6.83). These results suggest that the RASSF1 Ala133Ser SNP is associated with development of lung cancer, especially of lung adenocarcinoma. The increased risk of the heterozygous genotype is intriguing, implying a close relation with the dimerization feature of RASSF1 proteins.

Adenocarcinoma↗
PubMed2001

High-density single-nucleotide polymorphism (SNP) map of the 150-kb region corresponding to the human ATP-binding cassette transporter A1 (ABCA1) gene.

Highly dense catalogs of human genetic variations, in combination with high-throughput genotyping technologies, are expected to clarify individual genetic differences in pharmacological responsiveness and predispositions to common diseases. Here we report single-nucleotide polymorphisms (SNPs) present among 48 Japanese individuals at the locus for the human ATP-binding cassette transporter A1 (ABCA1) gene. ABCA1 plays a key role in apolipoprotein-mediated cholesterol transport, and mutations in this gene are responsible for Tangier disease and familial high-density lipoprotein deficiency associated with reduced cholesterol efflux. We identified a total of 162 SNPs, 149 of which were novel, within the 150-kb region encompassing the entire ABCA1 gene. Eight of the SNPs lie within coding elements, two in 5' flanking regions, 147 in introns, and five in 3' untranslated regions, but none were found in 5' untranslated or 3' flanking regions. The ratio of transitions to transversions was approximately 2.37 to 1. Our dense SNP map of this region could serve as a powerful resource for studies of complex genetic diseases that may be associated with ABCA1 and of individual responses to drug therapy.

ATP Binding Cassette Transporter 1↗
PubMed2002

Single nucleotide polymorphism of the human high affinity choline transporter alters transport rate.

High affinity choline uptake plays a critical role in the regulation of acetylcholine synthesis in cholinergic neurons. Recently, we succeeded in molecular cloning of the high affinity choline transporter (CHT1), which is specifically expressed in cholinergic neurons. Here we demonstrate the presence of functionally relevant, nonsynonymous single nucleotide polymorphism in the human CHT1 gene by comprehensive sequence analysis of the exons and the intron/exon boundaries including the transcription start site. The deduced amino acid change for the polymorphism is isoleucine to valine at amino acid 89 (I89V) located within the third transmembrane domain of the protein. The allele frequency of I89V was 6% for Ashkenazi Jews. Functional assessment of the I89V transporter in mammalian cell lines revealed a 40-50% decrease in V(max) for choline uptake rate compared with the wild type, whereas there was no alteration in the apparent affinities for choline, sodium, chloride, and the specific inhibitor hemicholinum-3. There also was no change in the specific hemicholinum-3 binding activity. The decreased choline uptake was not associated with the surface expression level of the protein as assessed by biotinylation assay. These results suggest an impaired substrate translocation in the I89V transporter. The Caenorhabditis elegans ortholog of CHT1 has a valine residue at the corresponding position and a single replacement from valine to isoleucine caused a decrease in the choline uptake rate by 40%, suggesting that this hydrophobic residue is generally critical in the choline transport rate in CHT1. This polymorphism in the allelic CHT1 gene may represent a predisposing factor for cholinergic dysfunction.

Acetylcholine↗
PubMed1999

Genotyping single nucleotide polymorphisms by primer extension and high performance liquid chromatography.

We have investigated the possibility of genotyping single nucleotide polymorphisms (SNPs) by primer extension and high performance liquid chromatography (HPLC). Using three polymorphisms of current interest to our group (an A/G polymorphism in the proneurotensin gene and A/G and T/C polymorphisms in the 5HT2a receptor gene), we show that robust signal is obtained using this simple analytic method which has the added advantages that sample loading and analysis are essentially automated, analytic time is brief, and no further purification step after primer extension is required. We also show that all stages of the HPLC-primer extension genotyping can be multiplexed which, together with automation, suggests that this system may be suitable for linkage studies based upon emerging SNP maps.

Base Sequence↗
PubMed2002

Thirteen single-nucleotide polymorphisms (SNPs) in the alcohol dehydrogenase 4 (ADH4) gene locus.

The human alcohol dehydrogenase 4 (ADH4) gene encodes the class II ADH4 pi subunit, which contributes to the metabolization of a wide variety of substrates, including ethanol, retinol, other aliphatic alcohols, hydroxysteroids, and lipid peroxidation products. Here we report the results of systematic screening for single-nucleotide polymorphisms (SNPs) in the ADH4 gene by means of direct sequencing combined with a polymerase chain reaction method. A total of 16 genetic variations including 13 SNPs were found; 4 in the 5' flanking region, 4 in the 5' untranslated region, and 8 within introns. No variation was found in coding, 3' untranslated, or 3' flanking regions. Eight of the 13 SNPs were not reported in the NCBI dbSNP database or any previous publications. Our SNP map presented here should provide tools to evaluate the role of ADH4 in complex genetic diseases and a variety of pharmacogenetic effects.

Alcohol Dehydrogenase↗
PubMed2004

Three-dimensional microarray platform applied to single nucleotide polymorphism analysis.

Bio-Strand, Inc., has developed a novel DNA microarray platform utilizing a three-dimensional (3D) DNA format. DNA probes or polymerase chain reaction (PCR) products are spotted onto a thread-like scaffold, which is then wound onto a cylindrical core. By wrapping the thread around the core, high efficiencies are achieved in sample analysis. Using allele-specific oligo (ASO) competitive hybridization (with Cy5 fluorescently labeled sequences), hybridized arrays are visualized using a helium-neon (HeNe) laser and quantitated/scored. The method can readily detect single nucleotide differences. We demonstrate the use of this Bio-Strand 3D array in the analysis of a single nucleotide polymorphism (SNP).

Carbocyanines↗
PubMed2003

Association of single nucleotide polymorphisms of the bile salt export pump gene with intrahepatic cholestasis of pregnancy.

BACKGROUND: We determined whether genetic variability in the gene encoding the bile salt export pump (BSEP) contributes to individual differences in susceptibility to the development of intrahepatic cholestasis of pregnancy (ICP). METHODS: The study involved 57 affected and 115 healthy control pregnant women who were genotyped for two single nucleotide polymorphisms (SNPs) in the BSEP gene. Chi-square analysis was used to assess genotype and allele frequency differences between the cholestatic and control groups. In addition, single locus analysis was expanded to pair of loci haplotype analysis to examine the estimated haplotype frequencies of the two SNPs, of unknown phase, among the cholestatic and control groups. Estimated haplotype frequencies were assessed using the maximum-likelihood method, employing an expectation-maximization (EM) algorithm. RESULTS: The genotype and allele frequency distribution of the two intragenic SNPs in the ICP and control groups revealed significant evidence of association with the exon 28 SNP (P=0.04 and P=0.02, respectively). In addition, a borderline allele association was noted with the intron 19 SNP (P=0.08). Although the overall distribution of estimated haplotypes of intron 19 and exon 28 SNPs did not differ between the ICP and control groups, the most common haplotype, A-G, was significantly overrepresented in the ICP group (P=0.02), at an odds ratio of 1.73 (95% CI: 1.08-2.74). CONCLUSIONS: The use of two intragenic SNPs in both single locus and haplotype analyses of association suggests that the BSEP gene is a susceptibility gene in intrahepatic cholestasis of pregnancy.

ATP Binding Cassette Transporter, Subfamily B, Mem↗
PubMed2001

Systematic search for single nucleotide polymorphisms in the insulin gene: evidence for a high frequency of -23T-->A in Japanese subjects.

It has recently been shown that the A/A genotype at g.-23 of the insulin gene correlates with impaired insulin secretion in response to body weight gain in subjects of European descent. To examine whether there are single nucleotide polymorphisms (SNPs) in the insulin gene associated with type 2 diabetes, all exons with their flanking sequences for 113 Japanese type 2 diabetic patients and 99 nondiabetic control subjects were analyzed using PCR direct sequencing. We have only found g.-23T --> A, 806G --> C, 1128T --> C, and 1141A --> C, which have previously been reported in alpha (A-C-C-C) and beta (T-G-T-A) alleles. The allele frequency of -23T --> A in control Japanese subjects was 97.4%, whereas that in Europeans is about 30%. The A/A genotype was found in 94 of 99 Japanese subjects (94.9%) and the allele frequencies of 806G --> C, 1128T --> C, and 1141A --> C were all 96.5%. The estimated haplotype frequencies were (A-C-C-C) (96.0%), (T-G-T-A) (2.0%), (A-G-T-A) (1.5%), and (T-C-C-C) (0.5%). No association of these SNPs or haplotypes with type 2 diabetes was evident. Thus, the A/A genotype at the g.-23 of insulin gene was generally high in Japanese subjects, which could account for the fact that they typically secrete lower levels of insulin.

Adult↗
PubMed2003

Quantification of donor and recipient hemopoietic cells by real-time PCR of single nucleotide polymorphisms.

Analysis of changes in recipient and donor hemopoietic cell origin is extremely useful to monitor the effect of stem cell transplantation (SCT) and sequential adoptive immunotherapy by donor lymphocyte infusions (DLI). We developed a sensitive and accurate method to quantify the percentage of recipient and donor cells by real-time PCR using single nucleotide polymorphisms (SNPs) as markers. Allele-specific PCR of seven SNPs resulted in specific markers for donor or recipient in 97% of HLA-identical sibling pairs. Both, recipient- and donor-derived hemopoietic cells can be simultaneously analyzed in 67% sibling pairs. We expect this can be increased to approximately 99% by developing three additional SNP-PCR. Serial dilution of SNP-positive DNA into either SNP-negative DNA or water revealed a detection limit of 0.1-0.01% depending on the amount of input DNA and start C(t) of the used SNP-PCR. Application of our real-time SNP-PCR method for a CML patient treated by allogeneic SCT and DLI demonstrated its feasibility to follow donor T-cell chimerism and early detection of residual and recurrent autologous hemopoiesis in response to treatment. This detailed monitoring of the genetic origin of hemopoietic cells, in particular immune effector cells and target cells after SCT and DLI, may substantially contribute to understanding of the mechanisms that play a role in the success of treatment.

Alleles↗
PubMed2004

In silico search for single nucleotide polymorphisms in genes important in vitamin E homeostasis.

Large inter-individual variation exists in the response to vitamin E supplementation, and this may influence the outcome of human studies. It is our hypothesis that genetic heterogeneity is an important determinant of vitamin E homeostasis. Therefore we have performed an in silico search for single nucleotide polymorphisms (SNPs) associated with genes involved in vitamin E homeostasis. Based on function, the following genes were considered as candidates for vitamin E heterogeneity: c-tocopherol transfer protein (TTPA), tocopherol associated protein (TAP), lipoprotein lipase (LPL), multidrug resistance protein 2 (MDR-2), pregnane X receptor (PXR) and members of the cytochrome P450 family (CYP). Searches for coding SNPs were initiated from web based programs of the National Center for Biotechnology Information (NCBI). SNP frequencies were calculated by dividing the number of annotated coding SNPs by the number of base pairs in the open reading frame. Genes for TTPA, TAP and CYP3A5 had calculated SNP frequencies between 503 and 837 base pairs per coding SNP (bp/cSNP) and so are not highly polymorphic. In contrast, cSNP frequencies in LPL, MRP2, PXR, CYP3A4 and CYP4F2 were in the range of 100 bp/cSNP and so are highly polymorphic. Thus proteins involved in specific vitamin E binding are not highly polymorphic, may not influence inter-individual variation and so may not be good candidates for population studies. Proteins involved in drug/lipid metabolism which indirectly influence vitamin E status are highly polymorphic, are likely to influence inter-individual variation and so are good candidates for population studies. We suggest that future studies are aimed at addressing the role of such SNPs in vitamin E homeostasis.

ATP Binding Cassette Transporter, Subfamily B↗
PubMed1999

Single-nucleotide polymorphisms, haplotypes, and their relevance to pharmacogenetics.

Recognition that there is a vast quantity of human genetic variation has had a pervasive impact on modern medicine, facilitating the identification of scores of genes that underlie monogenic clinical disorders, as well as genes involved in complex disease processes. The next logical step for human genetics is the exploration and elucidation of genes involved in differential pharmacological response: responders, nonresponders, and those with adverse side effects. An understanding of the role that genes have in pharmacological response is the cornerstone of personalized medicine. Pharmacogenetic activities have swiftly embraced these tenets, leading to a proliferation of resources and approaches meant to enable and expedite targeted drug discovery and development. To realize the potential of these efforts, it will be necessary to incorporate a better understanding of the population genetic and evolutionary processes that have shaped genetic variation in modern humans. This article introduces these concepts to provide context and guidelines for the use of this variation (primarily single-nucleotide polymorphisms and haplotypes) in pharmacogenetics.

Genetics, Population↗
PubMed2006

Positive association of obesity with single nucleotide polymorphisms of syndecan 3 in the Korean population.

CONTEXT: Very recently the unforeseen role of syndecan 3 (SDC3), a family of membrane-bound heparin sulfate proteoglycans, in the regulation of energy balance has been discovered in the Sdc3 null female mice. OBJECTIVE: The objective of the study was to test the hypothesis that single nucleotide polymorphisms (SNPs) in SDC3 are associated with obesity in the Korean population. DESIGN/SETTING/SUBJECTS: We conducted a population-based cohort study consisting of 229 control and 245 study subjects and a second independent study consisting of 192 control and 115 study subjects. MAIN OUTCOME MEASUREMENT: Body mass index (BMI) was measured. RESULTS: First, Sdc3 mRNA expression in the brain of ob/ob mice was profoundly increased, compared with control mice. Next, all three nonsynonymous SNPs [T271I (rs2282440, C>T), D245N (rs4949184, C>T), and V150I (rs2491132, C>T)] in the SDC3 gene in control female subjects (BMI < 23, n = 229) and obese female subjects (BMI > 30, n = 245) were genotyped. We demonstrated the presence of clear ethnic differences in three nonsynonymous SDC3 SNPs among African-Americans, Chinese, Europeans, and Koreans. Of three SNPs in SDC3, rs4949184 was not associated with obesity and the other two SNPs (rs2282440 and rs2491132) were strongly associated with obesity (P < 0.0001), and the results were confirmed in the second independent study group. Haplotype analysis also revealed strong association with obesity (chi2 = 76.92, P < 0.000001). CONCLUSIONS: There are ethnic differences in the SDC3 polymorphisms, and the polymorphisms are strongly associated with obesity.

Adult↗
PubMed2001

Positive associations between single nucleotide polymorphisms in the IGF2 gene region and body mass index in adult males.

We previously demonstrated an association between the insulin-like growth factor 2 (IGF2) gene 3'-untranslated region (3'-UTR) ApaI polymorphism and body mass index (BMI) in over 2500 middle-aged Caucasoid males. In the same cohort, we have now tested association with 11 more markers, including seven novel single nucleotide polymorphisms (SNPs), spanning >30 kb across the IGF2 gene. Three SNPs showed significant positive associations with BMI: 6815 A/T in the IGF2 P1 promoter (P = 0.00012, n = 2394) and the newly identified SNPs 1156 C/T in intron 2 (P = 0.017, n = 1567) and 1926 C/G in the 3'-UTR (P = 0.0062, n = 1872). There was strong pairwise linkage disequilibrium (LD) between the ApaI and 1926 C/G sites, whereas LD between ApaI and 6815 A/T, and between ApaI and 1156 T/C, was minimal. Univariately 6815 A/T, 1156 T/C and ApaI explained 1.03, 1.02 and 0.67% of the variation in BMI. Multi-way analysis of variance (ANOVA) models showed that 6815 A/T and 1156 T/C explained a further 0.4 and 0.8% of the variation beyond that accounted for by ApaI and the association of 1926 C/G with BMI disappeared after adjustment. The 6815 A/T, 1156 T/C and ApaI markers in effect constitute independent affirmations of our original hypothesized candidate gene region. In a stepwise multi-way ANOVA model, all three terms were significantly independently associated with BMI. The total proportion of BMI variance explained by this model was 2.25%, strongly suggesting that IGF2 genetic variation is a significant determinant of body weight in middle-aged males.

3' Untranslated Regions↗
PubMed2002

Association between single-nucleotide polymorphisms in selectin genes and immunoglobulin A nephropathy.

Although intensive efforts have been undertaken to elucidate the genetic background of immunoglobulin A nephropathy (IgAN), genetic factors associated with the pathogenesis of this disease are still not well understood. We designed a case-control association study that was based on linkage disequilibrium among single-nucleotide polymorphisms (SNPs) in the selectin gene cluster on chromosome 1q24-25, and we found two SNPs in the E-selectin gene (SELE8 and SELE13) and six SNPs in the L-selectin gene (SELL1, SELL4, SELL5, SELL6, SELL10, and SELL11) that were significantly associated with IgAN in Japanese patients. All eight SNPs were in almost complete linkage disequilibrium. SELE8 and SELL10 caused amino acid substitutions from His to Tyr and from Pro to Ser (chi2=9.02, P=.0026, odds ratio = 2.73 [95% confidence interval [CI] 1.38--5.38] for His-to-Tyr substitutions; chi2=17.4, P=.000031, odds ratio = 3.61 [95% CI 1.91--6.83] for Pro-to-Ser substitutions), and SELL1 could affect promoter activity of the L-selectin gene (chi2=19.5, P=.000010, odds ratio = 3.77 [95% CI 2.02--7.05]). The TGT haplotype at these three loci was associated significantly with IgAN (chi2=18.67, P=.000016, odds ratio = 1.88 [95% CI 1.41--2.51]). Our results suggest that these eight SNPs in selectin genes may be useful for screening populations susceptible to the IgAN phenotype that involves interstitial infiltration.

Case-Control Studies↗