Abstract:
:Clozapine is the drug of choice for treatment-resistant schizophrenia. However, its use is associated with variable clinical responses and serious adverse effects. Polymorphisms in genes encoding proteins involved in synaptic neurotransmission may account for such variability. Here, we studied independent and epistatic genetic associations of polymorphisms in DRD4 (120-bp duplication) and COMT (Val158Met) with clinical response to clozapine in people with treatment-resistant schizophrenia. We studied 93 participants who were on stable doses of clozapine for at least 12 weeks. A total score of less than or equal to 35 on the Brief Psychiatric Rating Scale was defined as a clinical response. The genetic associations were tested using logistic regression analyses. Neither polymorphism studied was found to be independently associated with response to clozapine. However, a statistically significant gene-gene interaction was observed between the polymorphisms. Participants with the COMT Val/Met or Met/Met genotype, who also had one or two DRD4 120-bp alleles (120/240 and 120/120), showed significantly better clinical response to clozapine. Our results highlight the importance of investigating gene-gene interactions, while studying the pharmacogenetics of clozapine.
journal_name
Pharmacogenet Genomicsjournal_title
Pharmacogenetics and genomicsauthors
Rajagopal VM,Rajkumar AP,Jacob KS,Jacob Mdoi
10.1097/FPC.0000000000000314subject
Has Abstractpub_date
2018-01-01 00:00:00pages
31-35issue
1eissn
1744-6872issn
1744-6880journal_volume
28pub_type
杂志文章abstract:OBJECTIVES:We tested the effect of kidney-specific multidrug resistance-related protein (MRP2, ABCC2) deficiency on renal organic solute disposition as well as on renal protein and gene expression. Furthermore, we investigated whether a particular kidney donor ABCC2 genotype is associated with delayed graft function in...
journal_title:Pharmacogenetics and genomics
pub_type: 杂志文章
doi:10.1097/FPC.0b013e328328d4e9
更新日期:2009-04-01 00:00:00
abstract:OBJECTIVE:To examine the relationship between types and locations of mutations of the enzyme alpha-galactosidase (Gal) A in Fabry disease and the response to the pharmacological chaperone 1-deoxygalactonojirimycin (DGJ). METHODS:T cells grown from normal individuals or from patients with Fabry disease were tested for ...
journal_title:Pharmacogenetics and genomics
pub_type: 杂志文章
doi:10.1097/FPC.0b013e32830500f4
更新日期:2008-09-01 00:00:00
abstract:OBJECTIVE:To investigate if polymorphisms of some genes involved in folliculogenesis predict ovarian response. METHODS:This prospective randomized study includes 124 egg donors genotyped for six SNPs ESR1 (rs2234693), AMHR2 (rs2002555), GDF-9 (rs10491279 and rs254286), AMH (rs10407022) and LHCBR (rs229327) genes and f...
journal_title:Pharmacogenetics and genomics
pub_type: 杂志文章
doi:10.1097/FPC.0000000000000386
更新日期:2019-11-01 00:00:00
abstract:OBJECTIVE:We evaluated whether percent time in target range (PTTR), risk of over-anticoagulation [international normalized ratio (INR)>4], and risk of hemorrhage differ by race. As PTTR is a strong predictor of hemorrhage risk, we also determined the influence of PTTR on the risk of hemorrhage by race. PARTICIPANTS AN...
journal_title:Pharmacogenetics and genomics
pub_type: 杂志文章
doi:10.1097/FPC.0000000000000298
更新日期:2017-10-01 00:00:00
abstract:BACKGROUND/AIM:MicroRNAs (miRNAs) are small noncoding RNAs that have been implicated in mechanisms underlying various types of cancers including hepatocellular carcinoma (HCC). Reports have indicated that single nucleotide polymorphisms in miRNA-196A2 and miRNA-146A genes may contribute to the risk of progression of he...
journal_title:Pharmacogenetics and genomics
pub_type: 杂志文章
doi:10.1097/FPC.0000000000000187
更新日期:2016-02-01 00:00:00
abstract:BACKGROUND AND AIM:Genetic variants in the mammalian target of rapamycin (mTOR) gene have become an interesting topic for the study of genetic susceptibility to cancer, but their associations with the risk of gastric cancer have not been fully investigated. MATERIALS AND METHODS:In a hospital-based case-control study ...
journal_title:Pharmacogenetics and genomics
pub_type: 杂志文章
doi:10.1097/FPC.0000000000000163
更新日期:2015-11-01 00:00:00
abstract:OBJECTIVES:We have earlier shown that diet and xenobiotic metabolizing enzyme genotypes influence colorectal cancer risk, and now investigate whether similar associations are seen in patients with premalignant colorectal adenomas (CRA), recruited during the pilot phase of the Scottish Bowel Screening Programme. METHOD...
journal_title:Pharmacogenetics and genomics
pub_type: 杂志文章
doi:10.1097/FPC.0b013e3283395c6a
更新日期:2010-05-01 00:00:00
abstract::Rapid development in the annotation of human genetic variation has increased the numbers of single nucleotide polymorphisms (SNPs) in candidate genes by several orders of magnitude. The selection of both useful target SNPs for disease-gene association studies and SNPs associated with the treatment response is therefor...
journal_title:Pharmacogenetics and genomics
pub_type: 杂志文章
doi:10.1097/01.fpc.0000194422.12770.fb
更新日期:2006-03-01 00:00:00
abstract::Endocrine disrupters, such as persistent organohalogen pollutants (POPs) may cause hypospadias, which is a common congenital anomaly in males, affecting 0.2-0.7%. We hypothesized that hypospadias incidence would be high among Greenlanders, who are one of the most POP exposed populations on earth through consumption of...
journal_title:Pharmacogenetics and genomics
pub_type: 杂志文章
doi:10.1097/01.fpc.0000199497.01101.93
更新日期:2006-05-01 00:00:00
abstract::Heterotrimeric guanine-binding proteins (G proteins) transmit signals from the cell surface to intracellular signal cascades. The β3-subunit encoded by the gene GNB3 is widely expressed and, therefore, involved in various physiological and pathophysiological processes. A C825T polymorphism located in exon 10 of GNB3 w...
journal_title:Pharmacogenetics and genomics
pub_type: 杂志文章,评审
doi:10.1097/FPC.0b013e3283491153
更新日期:2011-09-01 00:00:00
abstract:OBJECTIVE:Alcohol is detoxified in the liver by oxidizing enzymes that require nicotinamide adenine dinucleotide (NAD+) such that, in the rat, the availability of NAD+ contributes to control voluntary ethanol intake. The UChA and UChB lines of Wistar rats drink low and high amounts of ethanol respectively and differ in...
journal_title:Pharmacogenetics and genomics
pub_type: 杂志文章
doi:10.1097/FPC.0b013e32832dc12a
更新日期:2009-07-01 00:00:00
abstract::Lipid changes with statin treatments vary greatly between individuals for reasons which are largely unknown. This study was performed to examine the genetic determinants of lipid responses to rosuvastatin in Chinese patients. A total of 125 polymorphisms in 61 candidate genes from 386 Chinese patients were analyzed fo...
journal_title:Pharmacogenetics and genomics
pub_type: 杂志文章
doi:10.1097/FPC.0b013e32833de489
更新日期:2010-10-01 00:00:00
abstract:OBJECTIVES:It has been shown that acetaldehyde is an active metabolite of ethanol with central actions that modulate behavior. Catalase has been proposed as the main enzyme responsible for the synthesis of acetaldehyde from ethanol in the brain. Recent studies, however, suggest that cytochrome, in particular the isofor...
journal_title:Pharmacogenetics and genomics
pub_type: 杂志文章
doi:10.1097/FPC.0b013e328324e726
更新日期:2009-03-01 00:00:00
abstract:OBJECTIVES:Among serotonin (5-HT) receptors, the 5-HT3 receptor is the only ligand-gated ion channel. 5-HT3 antagonists such as ondansetron and tropisetron may improve auditory gating and neurocognitive deficits in schizophrenic patients. Moreover, many antipsychotic drugs are antagonists at 5-HT3 receptors. However, t...
journal_title:Pharmacogenetics and genomics
pub_type: 杂志文章,随机对照试验
doi:10.1097/FPC.0b013e3283313296
更新日期:2009-11-01 00:00:00
abstract:BACKGROUND:GW320659, a highly selective neuronal norepinephrine and dopamine re-uptake inhibitor, has been evaluated for the treatment of obesity. Scrutiny of the weight loss data from a phase II study (GlaxoSmithKline study OBS20001) showed a wide variation in weight loss response following GW320659 treatment and the ...
journal_title:Pharmacogenetics and genomics
pub_type: 杂志文章,多中心研究,随机对照试验
doi:10.1097/01213011-200512000-00006
更新日期:2005-12-01 00:00:00
abstract:OBJECTIVE:Genetic polymorphisms are associated with lipid-lowering response to statins, but generalizeability to disease endpoints is unclear. The association between 82 common single nucleotide polymorphisms (SNPs) in six lipid-related or statin-related genes (ABCB1, CETP, HMGCR, LDLR, LIPC, NOS3) and incident nonfata...
journal_title:Pharmacogenetics and genomics
pub_type: 杂志文章
doi:10.1097/FPC.0b013e3283033528
更新日期:2008-08-01 00:00:00
abstract:OBJECTIVE:Recently, the minor allele of the rs13064411A>G polymorphism in the WD repeat domain 52 (WDR52) gene was associated with increased statin-induced proprotein convertase subtilisin/kexin type 9 (PCSK9) levels and with LDL cholesterol response to statins. PCSK9 promotes LDL receptor degradation, leading to incre...
journal_title:Pharmacogenetics and genomics
pub_type: 杂志文章
doi:10.1097/FPC.0000000000000120
更新日期:2015-03-01 00:00:00
abstract:OBJECTIVES:Nine different functional UGT1A enzymes are generated from a single UGT1A gene by alternative splicing, with each enzyme having a unique exon 1. SN-38, the active metabolite of the anticancer agent irinotecan, is metabolized by both UGT1A1 and UGT1A9. We aim to characterize the UGT1A9-UGT1A1 haplotypes in As...
journal_title:Pharmacogenetics and genomics
pub_type: 杂志文章
doi:10.1097/01213011-200505000-00004
更新日期:2005-05-01 00:00:00
abstract::The 1976C>T polymorphism in the adenosine A2A receptor gene (ADORA2A) modulates the psychological response to administration of the adenosine receptor antagonist caffeine. We quantified the vascular response to adenosine and caffeine to determine the relevance of this variant allele in the physiological response to th...
journal_title:Pharmacogenetics and genomics
pub_type: 杂志文章
doi:10.1097/FPC.0b013e32803fb78f
更新日期:2007-07-01 00:00:00
abstract:OBJECTIVE:Compared with genetic factors, drug interactions are largely unexplored in pharmacogenetic studies. This study sought to systematically investigate the effects of VKORC1, STX4A, CYP2C9, CYP4F2, CYP3A4, and GGCX gene polymorphisms and interacting drugs on warfarin maintenance dose. METHODS:A retrospective stu...
journal_title:Pharmacogenetics and genomics
pub_type: 杂志文章
doi:10.1097/FPC.0b013e32834f45f9
更新日期:2012-03-01 00:00:00
abstract::The genetically polymorphic cytochrome P450 2C9 (CYP2C9) metabolizes many important drugs. Among them, phenytoin has been used as a probe to determine CYP2C9 phenotype by measuring the urinary excretion of its major metabolite, S-enantiomer of 5-(4-hydroxyphenyl)-5-phenylhydantoin (p-HPPH). Phenytoin pharmacokinetic i...
journal_title:Pharmacogenetics and genomics
pub_type: 杂志文章
doi:10.1097/01.fpc.0000174787.92861.91
更新日期:2005-11-01 00:00:00
abstract:OBJECTIVES:Flavin-containing monooxygenase 3 (FMO3) is involved in the metabolism of foreign chemicals, including therapeutic drugs, and thus mediates interactions between humans and their chemical environment. Loss-of-function mutations in the gene cause the inherited disorder trimethylaminuria, or fish-odour syndrome...
journal_title:Pharmacogenetics and genomics
pub_type: 杂志文章
doi:10.1097/FPC.0b013e328256b198
更新日期:2007-10-01 00:00:00
abstract:BACKGROUND:Despite the enormous success of imatinib in chronic myeloid leukemia (CML), therapy resistance has emerged in a significant proportion of patients, partly because of the overexpression of ABC efflux transporters. METHODS:Using an array comprising 667 miRNAs, we investigated whether the expression of microRN...
journal_title:Pharmacogenetics and genomics
pub_type: 杂志文章
doi:10.1097/FPC.0b013e328350012b
更新日期:2012-03-01 00:00:00
abstract:OBJECTIVE:Corticotropin-releasing hormone receptor (CRHR)-2 participates in smooth muscle relaxation response and may influence acute airway bronchodilator response to short-acting beta2-agonist treatment of asthma. We aim to assess associations between genetic variants of CRHR2 and acute bronchodilator response in ast...
journal_title:Pharmacogenetics and genomics
pub_type: 杂志文章,多中心研究,随机对照试验
doi:10.1097/FPC.0b013e3282fa760a
更新日期:2008-05-01 00:00:00
abstract:OBJECTIVE:Vitamin K is an essential cofactor for the synthesis of several blood coagulation factors. It has been suggested that the apolipoprotein E (ApoE) genotype has profound effects on vitamin K status. Therefore, we investigated whether this common genetic polymorphism influenced dose requirements and effects of c...
journal_title:Pharmacogenetics and genomics
pub_type: 杂志文章
doi:10.1097/01213011-200502000-00002
更新日期:2005-02-01 00:00:00
abstract::We recently showed an association between the FCGR3A V/F polymorphism and the biological response [assessed on the basis of a C-reactive protein (CRP) concentration decrease] to infliximab in Crohn's disease. The CRP and FCGR3A genes are located on the same 1q23 locus. The present study aimed: (i) to exclude a linkage...
journal_title:Pharmacogenetics and genomics
pub_type: 杂志文章
doi:10.1097/01.fpc.0000182776.57437.d8
更新日期:2006-01-01 00:00:00
abstract:OBJECTIVE:A meta-analysis was carried out of published studies on the effect of the CYP3A5 6986A>G polymorphism in liver donors and transplant recipients on tacrolimus pharmacokinetics. METHODS:Cohort studies that evaluated the relationship between the CYP3A5 polymorphism in liver donors and transplant recipients and ...
journal_title:Pharmacogenetics and genomics
pub_type: 杂志文章,meta分析,评审
doi:10.1097/FPC.0b013e3283642fb3
更新日期:2013-10-01 00:00:00
abstract:OBJECTIVES:Epidemiological studies documented associations between single nucleotide polymorphisms (SNPs) in the nucleotide excision repair gene XPD/ERCC2 and cancer risk. Little is known, however, about the underlying mechanisms for these associations. We explored a novel mechanism that could further explain the repor...
journal_title:Pharmacogenetics and genomics
pub_type: 杂志文章
doi:10.1097/FPC.0b013e3280115e63
更新日期:2007-11-01 00:00:00
abstract:OBJECTIVE:Niacin has been used for seven decades to modulate plasma lipids, but its mechanism of action is still unclear. We sought to determine whether variants in the niacin receptor gene, hydroxyl-carboxylic receptor 2 (HCAR2), are associated with lipid response to treatment. PARTICIPANTS AND METHODS:Coding variant...
journal_title:Pharmacogenetics and genomics
pub_type: 杂志文章,随机对照试验
doi:10.1097/FPC.0000000000000289
更新日期:2017-08-01 00:00:00
abstract:OBJECTIVE:Methotrexate (MTX) is an important drug in the treatment of pediatric acute lymphoblastic leukemia (ALL). MTX is cytotoxic as it impairs DNA and RNA synthesis by inhibiting the enzymes dihydrofolate reductase (DHFR) and thymidylate synthase (TYMS). The association between genetic variants within the TYMS gene...
journal_title:Pharmacogenetics and genomics
pub_type: 杂志文章,meta分析
doi:10.1097/FPC.0000000000000352
更新日期:2018-10-01 00:00:00