Genotype and allele frequency of human multidrug resistance (MDR1) gene C3435T polymorphism in Denizli province of Turkey

Human p-glycoprotein encoded by human multidrug resistance (MDR1) gene, is a transmembrane protein that serves as efflux pump for a wide variety of lipophilic compounds possessing a physiological role in protecting cells against the DNA damaging of certain xenobiotics. According to the published data, the frequency of C3435T polymorphism differs depending on the different ethnical populations such as Asian, African, and Caucasians populations. In our study, we identified the MDR1 C3435T polymorphism in 150 healthy volunteers in Denizli province of Turkey. DNA was extracted from peripheral blood samples by standard phenol/chloroform extraction method. Polymerase chain reaction–restriction fragment length polymorphism was used for the detection of C3435T single nucleotide polymorphism. We obtained CC, CT and TT genotype frequencies as 20, 53 and 27%, respectively. According to our results, the C allele in Turkish population (Denizli province, west of Turkey) is found 47% and this data shows similarity with Caucasian (UK and German) populations and significantly lower than African populations (p < 0.001). Our study is the first data on the genotype and allele frequency of the human multidrug resistance (MDR1) Gene C3435T Polymorphism in Denizli Province at regional basis in Turkey. Our results could serve as a basis for large-scale correlation studies on the relevance of C3435T genotype in cancer therapy and other diseases in Turkish population. Investigation of genotype frequencies related with p-glycoprotein substrates should be investigated in large scale at regional bases in Turkish population. The scaled-up data might help either to the use of p-glycoprotein substrates to be used for therapeutic applications and population genetics considering the genotype frequencies possibly occurring throughout the history in Anatolian basin.     

MDR1 single nucleotide polymorphism C3435T in Turkish patients with non-small-cell lung cancer

We assessed whether single nucleotide polymorphisms (SNPs) in MDR1 gene C3435T predicted the outcome of platinum-based chemotherapies and survival in our non small cell lung cancer (NSCLC) patients. A total of 79 non-small cell lung cancer patients were enrolled to study. We determined the MDR1 C3435T single nucleotide gene polymorphisms. Median age was 60years: 91.7% male, 8.9% female. We found that CC, CT, TT genotype and T, C allele frequencies in lung cancer patients as 24.1%, 62%, 13.9% and 44.3%, 55.7%, respectively. Patients with CT genotype had a higher response rate (11.4%) than the other genotypes. However, this difference is not statistically significant (p=0.743). Cox regression analysis for overall survival showed that ECOG PS status 0 (HR PS 1 vs. 0, 5.68 p=0.002; HR of PS 2 vs. 0 is 21.579, p=0.001; HR of PS 3 vs. 0 is 35.35, p=0.001), stage ≤II (HR of stage III vs. I+II is 17.77; p=0.016, HR of stage IV vs. I+II is 26.97, p=0.006), and albumin level ≥3g/dl (HR of albumin <3g/dl vs. ≥3g/dl is 2.46, p=0.044) were the most important prognostic factors (also, time to progression was related to these factors). There was no significant association between the genotypes and clinicopathologic parameters; however, good performance status, early stage and ≥3g/dl albumin level were found to be the most important prognostic factors for overall survival and progression-free survival.     

Polymorphism C3435T of the MDR1 gene in Central Americans and Spaniards

The human multidrug resistance gene (MDR1) encodes for P-glycoprotein (P-gp) which is a transmembrane transporter protein that acts as an efflux pump for a number of lypophilic compounds. It plays a protective role for cells against DNA damage. The wobble C3435T polymorphism at exon 26 has been associated with different expression levels and activity. Differences in allele frequency of the C3435T polymorphism have been demonstrated between distinct ethnic groups. In our study we examined these polymorphisms in 433 healthy individuals. From these, 229 were Central American mestizos from Nicaragua (n = 117) and El Salvador (n = 112) to be compared with a group of 204 North Spaniards, with the aim of detecting potential genotypic differences between these populations. The genotypes were determined by PCR-RFLP. The frequencies of the C allele were very similar among Central Americans (0.53) and Spaniards (0.52), which is consistent with the ethnic origin of Central American individuals (Amerindians and European Caucasians). In comparison to other previously studied populations, the C allele frequency in Central Americans was significantly lower than that found in African populations and higher than that observed in the Indian and Southwest Asian populations. These data may be relevant for dose recommendation of P-gp substrate drugs and also for studies of allele disease association in the Central American population.     

Association between MDR1 C3435T polymorphism and risk of breast cancer

The C3435T (rs1045642) polymorphism, located in multi-drug resistance gene 1 (MDR1), has demonstrated its role in decreasing the P-gp activity level which is related to the carcinogenesis. Many published studies have evaluated the association between the MDR1 C3435T polymorphism and breast cancer risk. However, the results remain conflicting rather than conclusive. To derive a more precise estimation of the association between MDR1 C3435T polymorphism and risk of breast cancer, we performed a meta-analysis comprised of 10 case–control studies, including 5282 breast cancer cases and 7703 controls. Odds ratios (ORs) and 95% confidence intervals (CIs) were used to evaluate the strength of the association. The overall results indicated that the variant genotypes were associated with a significantly increased risk of breast cancer (TT versus CC: OR = 1.45, 95% CI = 1.14–1.30, TT versus CT/CC: OR = 1.13, 95% CI = 1.04–1.23, TT/CT versus CC: OR = 1.22, 95% CI = 1.02–1.46). Our results suggest that the MDR1 C3435T polymorphism may contribute to individual susceptibility to breast cancer.     

No association of Disrupted-in-Schizophrenia-1 variation with prefrontal function in patients with schizophrenia and bipolar disorder

The Disrupted-in-Schizophrenia-1 (DISC1) gene has been implicated in both schizophrenia and bipolar disorder by linkage and genetic association studies. Altered prefrontal cortical function is a pathophysiological feature of both disorders, and we have recently shown that variation in DISC1 modulates prefrontal activation in healthy volunteers. Our goal was to examine the influence of the DISC1 polymorphism Cys704Ser on prefrontal function in schizophrenia and bipolar disorder. From 2004 to 2008, patients with schizophrenia (N = 44), patients with bipolar disorder (N = 35) and healthy volunteers (N = 53) were studied using functional magnetic resonance imaging while performing a verbal fluency task. The effect of Cys704Ser on cortical activation was compared between groups as Cys704 carriers vs. Ser704 homozygotes. In contrast to the significant effect on prefrontal activation we had previously found in healthy subjects, no significant effect of Cys704Ser was detected in this or any other region in either the schizophrenia or bipolar groups. When controls were compared with patients with schizophrenia, there was a diagnosis by genotype interaction in the left middle/superior frontal gyrus [family-wise error (FWE) P = 0.002]. In this region, Ser704/ser704 controls activated more than Cys704 carriers, and there was a trend in the opposite direction in schizophrenia patients. In contrast to its effect in healthy subjects, variation in DISC1 Cys704Ser704 genotype was not associated with altered prefrontal activation in patients with schizophrenia or bipolar disorder. The absence of an effect in patients may reflect interactions of the effects of DISC1 genotype with the effects of other genes associated with these disorders, and/or with the effects of the disorders on brain function.     

Association between trace elements in serum from bipolar disorder and schizophrenia patients considering treatment effects

BackgroundImbalances in metal concentrations have been suggested to contribute to the pathophysiology of different brain disorders, such as bipolar disorder (BD) and schizophrenia (SCZ).ObjectivesThe aim of this exploratory study is to evaluate the association between the concentrations of macro/trace elements in serum from BD and SCZ patients considering the effects from different treatments.MethodsEleven subjects with SCZ, seven with BD treated with lithium (BDL) and eight subjects with BD treated with other medications except lithium (BDN) were recruited for the study, as well as eleven healthy controls (HC). Serum concentrations of eleven macro/trace elements (Se, Zn, Fe, K, Ca, Mg, P, Al, Cu, Mn, and Ni) were determined using inductively coupled plasma mass spectrometry (ICP-MS).ResultsSe and Zn concentrations were significantly lower for patients with SCZ and BD in comparison to HC by one-way ANOVA test. Moreover, serum concentrations for Fe were significantly higher (p < 0.05) in BDN (548 ± 92 μg L⁻¹) and SCZ (632 ± 279 μg L⁻¹) in comparison to HC (421 ± 121 μg L⁻¹). A significant negative correlation was reported between Se and Fe in BDL group (r = −0.935, p < 0.05). In addition, a significantly higher Cu/Zn ratio was determined in SCZ group against HC (ratio = 2.4, p = 0.028).ConclusionsThe obtained results suggest that the imbalance in Fe concentrations is an effect of BD treatment. Lithium is supposed to have an antagonist effect for Se in BDL patients. A negative correlation reported between Fe and BMI in SCZ group could be related to antipsychotic treatment and the Cu/Zn ratio reported could be considered as a suggesting parameter to relate oxidative stress to SCZ. Future studies including larger number of patients with SCZ and BD before and after treatment are necessary to confirm the investigative results presented herein.     

Valproyl-CoA and esterified valproic acid are not found in brains of rats treated with valproic acid,but the brain concentrations of CoA and acetyl-CoA are altered

Sodium valproate and lithium are used to treat bipolar disorder. In rats, both reduce the turnover of arachidonic acid in several brain phospholipids, suggesting that arachidonate turnover is a common target of action of these mood stabilizers. However, the mechanisms by which these drugs reduce arachidonate turnover in brain are not the same. Lithium decreases turnover by reducing the activity and expression of the 85-kDa type IVA cytosolic phospholipase A₂ (cPLA₂); valproate does not affect cPLA₂ activity or expression. To test whether valproate alters neural membrane order by direct esterification into phospholipid or by interrupting intermediary CoA metabolism, we measured valproyl-CoA, esterified valproate, and short chain acyl-CoAs in brains from control rats and rats treated chronically with sodium valproate. Valproyl-CoA and esterified forms of valproate were not found in brain with detection limits of 25 and 37.5 pmol/g brain^–1, respectively. Valproate treatment did result in a 1.4-fold decrease and 1.5-fold increase in the brain concentrations of free CoA and acetyl-CoA when compared to control. Therefore the reduction of brain arachidonic acid turnover by chronic valproate in rats is not related to the formation of valproyl-CoA or esterified valproate, but may involve changes in the intermediary metabolism of CoA and short chain acyl-CoA.     

Association of BDNF gene polymorphism with bipolar disorders in Han Chinese population

Recent data suggest that brain‐derived neurotrophic factor (BDNF) plays an essential role in neuronal plasticity and etiology of bipolar disorders (BPD). However, results from different studies have been inconsistent. In present study, 342 patients who met DSM‐IV (Diagnostic and Statistical Manual of Mental Disorders, 4th Edition) criteria for bipolar disorders type I (BPD‐I) or type II (BPD‐II) and 386 matched health controls were enrolled, and TaqMan® SNP Genotyping Assays (Applied Biosystems, Foster City, CA, USA) were applied to detect the functional polymorphism rs6265 (Val66Met) of BDNF gene. Treatment response to lithium and valproate was retrospectively determined. The association between Val66Met polymorphism and BPD, treatment response to mood stabilizers, was estimated. The genotype and allele distribution of Val66Met polymorphism between BPD patients and control subjects showed significant difference (genotype: χ² = 6.18, df = 2, P = 0.046; allele: χ² = 5.01, df = 1, P = 0.025) with Met allele as risk factor for disease susceptibility (OR = 0.79, 95%CI as 0.64–0.97). The post hoc analysis interestingly showed that Met allele had opposite effect on the treatment response for BPD‐I and BPD‐II separately. For BPD‐I patients, the response score in Val/Val group was significantly lower than that in Met allele carriers (t = ?2.27, df = 144, P = 0.025); for BPD‐II patients, the response score in Val/Val group was significantly higher than that in Met allele carriers (t = 2.33, df = 26, P = 0.028). Although these results should be interpreted with caution because of the limited sample for Val/Val genotype in BPD‐II patients (N = 5), these findings strengthen the hypothesis that BDNF pathway gets involved in the etiology and pharmacology of BPD and suggest the differences between BPD‐I and BPD‐II.     

Proteomic analysis of MOLT-4 cells treated by valproic acid

The effect of valproic acid (VA) on protein expression in human T-lymphocytic leukemia cells MOLT-4 was studied. VA is an inhibitor of histonedeacetylases and has a potential use as antitumor agent in leukemia treatment. The authors in this work prove that 4 h long incubation with 2 mmol/l VA causes phosphorylation of histone H2A.X and its colocalization with 53BP1 in nuclear foci. Their co-localization is typical for DSB signaling machinery. These foci were detected in cells after 4 h exposure without increase of Annexin V positive apoptotic cells. Slight increase in apoptosis (Annexin V positivity) after 24 h is accompanied by more intensive increase in phosphorylation of H2A.X and also by formation of nuclear foci containing γH2A.X and 53BP1. Treatment of cells with 2 mmol/l VA resulted in induction of apoptosis affecting about 30% of cells after incubation for 72 h. The changes in protein expression were examined after cell incubation with 2 mmol/l VA for 4 h. Proteins were separated by two-dimensional electrophoresis and quantified using image evaluation system. Those exhibiting significant VA-induced abundance alterations were identified by mass spectrometry. Changes in expression of 22 proteins were detected, of which 15 proteins were down-regulated. Proteomic analysis resulted in successful identification of three proteins involving alfa-tubulin 3, tubulin-specific chaperone and heterogeneous nuclear ribonucloprotein F. Expression of seven proteins was up-regulated, including heterogeneous nuclear ribonucloprotein A/B. Identified proteins are related to microtubular system and hnRNP family. Suppression of microtubular proteins and changes of balance among hnRNPs can contribute to proliferation arrest and apoptosis induction.     

双相情感障碍患者健康状况与肠道菌群的相关性分析

探讨双相情感障碍（BD）患者健康状况与肠道菌群的相关性,为该类患者的治疗提供参考。

收集我院BD患者（BD组）和健康人群（健康对照组）的粪便样本,使用QIAamp^® DNA粪便抽提试剂盒进行粪便样本的总DNA提取,随后进行16S rRNA基因测序,使用主成分分析（PCoA）探究健康对照组和BD组患者肠道菌群多样性情况。采用BD患者自我报告健康问卷评估患者的健康状况。

BD患者肠道菌群Shannon指数（P = 0.020 5）、Chao指数（P = 0.025 1）和Simpson指数（P = 0.020 8）显著低于健康对照组（均P＜0.05）。加权的Unifrac PCoA分析表明,BD组患者肠道菌群相似性低于健康对照组。两组对象肠道菌群门水平上有差异的菌群为放线菌门和厚壁菌门;属、种水平上的差异菌群有普氏粪杆菌、梭状芽胞杆菌和瘤胃球菌属。两组对象在功能性身体健康（PCS）、心理健康（MCS）、睡眠质量（PSQI）、抑郁（PHQ-9）、焦虑（GAD-7）和狂躁（ASRM）的平均总成绩上差异均有统计学意义（均P＜0.05）。BD患者的功能性身体健康得分与肠道放线菌门、厚壁菌门、拟杆菌属、梭状芽胞杆菌呈负相关,与普氏粪杆菌以及瘤胃球菌属呈正相关。

健康对照组和BD组患者的肠道菌群结构大致相似,BD患者的肠道菌群多样性低于健康对照组,BD患者健康状况与肠道菌群存在一定的相关性。

     

Analysis of common MDR1 (ABCB1) gene C1236T and C3435T polymorphisms in Turkish patients with familial Mediterranean fever

The multidrug resistance (MDR1) gene encodes a P-glycoprotein that plays a key role in drug bioavailability and response to drugs in different human populations. More than 50 SNPs have been described for the MDR1 gene. Familial Mediterranean fever (FMF) is considered an autosomal recessive hereditary disease, associated with a single gene named the Mediterranean fever gene (MEFV). However, about one-third of FMF patients have only one mutated allele, suggesting that this disease is expressed as an autosomal dominant trait with partial penetration or an additional gene might be responsible for the disease. We made genotype and haplotype analyses of the MDR1 gene in 142 FMF patients and 130 unrelated Turkish subjects; two MDR-1 genetic markers (C1236T and C3435T) were analyzed by PCR-RFLP analysis. FMF patients had a significantly higher frequency of the 3435 CT genotype compared with the control group (59.9% in FMF patients versus 44.6% in controls; odds ratio [OR] = 1.85; 95% confidence interval [CI] = 1.14-3.00). Based on haplotype analysis, the T-C shift was significantly more frequent in controls (14.4% versus 7.1% in FMF patients). This haplotype could be protective for FMF disease (OR = 0.45; 95%CI = 0.25-0.84). The frequency of CC-CT (1236-3435) binary genotype was significantly higher in FMF patients (14.79% versus 4.61% in controls; OR = 3.59; 95%CI = 1.40-9.20).     

Continuum of depressive and manic mixed states in patients with bipolar disorder: quantitative measurement and clinical features

Bipolar mixed states combine depressive and manic features, presenting diagnostic and treatment challenges and reflecting a severe form of the illness. DSM-IV criteria for a mixed state require combined depressive and manic syndromes, but a range of mixed states has been described clinically. A unified definition of mixed states would be valuable in understanding their diagnosis, mechanism and treatment implications. We investigated the manner in which depressive and manic features combine to produce a continuum of mixed states. In 88 subjects with bipolar disorder (DSM-IV), we evaluated symptoms and clinical characteristics, and compared depression-based, mania-based, and other published definitions of mixed states. We developed an index of the extent to which symptoms were mixed (Mixed State Index, MSI) and characterized its relationship to clinical state. Predominately manic and depressive mixed states using criteria from recent literature, as well as Kraepelinian mixed states, had similar symptoms and MSI scores. Anxiety correlated significantly with depression scores in manic subjects and with mania scores in depressed subjects. Discriminant function analysis associated mixed states with symptoms of hyperactivity and negative cognitions, but not subjective depressive or elevated mood. High MSI scores were associated with severe course of illness. For depressive or manic episodes, characteristics of mixed states emerged with two symptoms of the opposite polarity. This was a cross-sectional study. Mixed states appear to be a continuum. An index of the degree to which depressive and manic symptoms combine appears useful in identifying and characterizing mixed states. We propose a depressive or manic episode with three or more symptoms of the opposite polarity as a parsimonious definition of a mixed state.     

Genome-wide association study on bipolar disorder in the Bulgarian population

Bipolar disorder is a severe psychiatric disorder influenced by environmental and genetic factors. Genetic studies have implicated many variants in the disease's etiology but only few have been successfully replicated. We conducted a genome-wide association study (GWAS) on bipolar disorder in the Bulgarian population followed by a replication study of the top 100 single nucleotide polymorphisms (SNPs) showing the smallest P values. The GWAS was performed on 188 bipolar disorder patients and 376 control subjects genotyped on the Illumina 550 platform. The replication study was conducted on 122 patients and 328 controls. Although our study did not show any association P value that achieved genome-wide significance, and none of the top 100 SNPs reached the Bonferroni-corrected P value in the replication study, the plausible involvement of some variants cannot be entirely discarded. Three polymorphisms, rs8099939 [P = 2.12 × 10(-6), odds ratio (OR) = 1.95, 95% confidence interval (CI) = 1.43-2.67] in GRIK5, rs6122972 (P = 3.11 × 10(-6), OR = 2.02, 95% CI = 1.46-2.80) in PARD6B and rs2289700 (P = 9.14 × 10(-6), OR = 2.13, 95% CI = 1.53-2.95) in CTSH remained associated at a similar level after Mantel-Haenszel test for combining the results from the genome-wide and replication studies. A modest association was also detected for SNP rs1012053 (GWAS P = 4.50 × 10(-2)) in DGKH, which has already been reported as the most significant variant in a previous genome-wide scan on bipolar disorder. However, further studies using larger datasets are needed to identify variants with smaller effects that contribute to the risk of bipolar disorder.     

Mitochondrial DNA 3644T-->C mutation associated with bipolar disorder

Mitochondrial dysfunction associated with mutant mitochondrial DNA (mtDNA) has been suggested in bipolar disorder, and comorbidity with neurodegenerative diseases was often noted. We examined the entire sequence of mtDNA in six subjects with bipolar disorder having comorbid somatic symptoms suggestive of mitochondrial disorders and found several uncharacterized homoplasmic nonsynonymous nucleotide substitutions of mtDNA. Of these, 3644C was found in 5 of 199 patients with bipolar disorder but in none of 258 controls (p = 0.015). The association was significant in the extended samples [bipolar disorder, 9/630 (1.43%); controls, 1/734 (0.14%); p = 0.007]. On the other hand, only 5 of 25 family members with this mutation developed bipolar disorder, of which 4 patients with 3644C had comorbid physical symptoms. The 3644T-->C mutation converts amino acid 113, valine, to alanine in the NADH-ubiquinone dehydrogenase subunit I, a subunit of complex I, and 113 valine is well conserved from Drosophila to 61 mammalian species. Using transmitochondrial cybrids, 3644T-->C was shown to decrease mitochondrial membrane potential and complex I activity compared with haplogroup-matched controls. According to human mitochondrial genome polymorphism databases, 3644C was not found in centenarians but was found in 3% of patients with Alzheimer disease and 2% with Parkinson disease. The result of modest functional impairment caused by 3644T-->C suggests that this mutation could increase the risk for bipolar disorder.     

Association of adhesion molecule PECAM-1/CD31 polymorphism with susceptibility to cerebral malaria in Thais

Adhesion molecules on endothelial cells are known to be important ligands for malaria infected red blood cells (PRBC) [Mol Biochem Parasitol, 76, (1996) 1], and may be involved in the pathogenic process of cerebral malaria (CM) which is the most serious complication of falciparum malaria, through enhancing micro embolism or sequestration in the capillaries of the brain. PECAM-1/CD31 is one of these candidate ligands and is coded by a polymorphic gene. Two hundred and ten Thai malaria patients (43 cerebral, 89 severe and 78 uncomplicated) were analyzed for their genetic polymorphism of CD31 to examine the clinical relationship between the disease and specific genotypes. Four alleles were defined 125 valine (V)-563 asparagine (N); 125V-563 serine (S); 125 leucine (L)-563N; and 125L-563S. We found that the frequency of the 125 V/V 563 N/N genotype was significantly high in CM patients as compared with severe cases without CM (P<0.01, OR=2.92), suggesting that this genotype is one of the risk factors for CM.     

Lateralization of hand skill in bipolar affective disorder

Diverse strands of evidence suggest that schizophrenia is associated with an excess of left and mixed handedness, reflecting anomalous cerebral lateralization. Genetic studies have indicated a degree of overlap between bipolar disorder (BPD) and schizophrenia. Nevertheless, pattern of handedness and degree of lateralization have not been explicitly tested in BPD. We measured handedness, footedness and relative manual dexterity in a sample of 47 families comprising BPD probands and their bipolar-spectrum and unaffected relatives (N = 240). The BPD I sample (N = 55) was significantly more lateralized on handedness, footedness and relative manual dexterity than their unaffected relatives (N = 66). They were also more lateralized than their relatives with other psychiatric diagnoses. No evidence of excess mixed handedness or footedness was observed in the BPD I sample. We raise the possibility that schizophrenia and BPD I differ in that disproportionate left-hemisphere dominance in BPD I is associated with right-hemisphere dysfunction leading to deficits in emotional regulation. Given our results, we hypothesized that degree of lateralization may be a phenotypic marker or endophenotype for BPD I. We therefore conducted a family-based genetic association analysis with this quantitative trait. Relative hand skill was significantly associated with a functional variant in the catechol-O-methyltransferase gene. We speculate that this polymorphism may influence brain lateralization.     

多药耐药基因1 C3435T 多态性与癫痫耐药的关联性研究

目的:探讨我国癫痫患者P-糖蛋白基因多态性(C3435T)与抗癫痫药物反应性的关联性.方法:采用PCR-RFLP(聚合酶链反应-限制性片段长度多态性分析)的方法对156例癫痫患者外周血进行分型.其中,耐药组癫痫患者85例,有效组癫痫患者71例.结果:耐药组癫痫患者CC基因型21例,占24.70%;有效组癫痫患者CC基因型19例,占26.76%.两组比较无显著差异性.结论:本研究未发现P-gpC3435T基因型与癫痫耐药的关联性.     

SIRT1 gene, schizophrenia and bipolar disorder in the Japanese population: an association study

Several lines of evidence suggest that alterations in circadian rhythms might be associated with the pathophysiology of psychiatric disorders such as schizophrenia and bipolar disorder (BP). A recent study reported that SIRT1 is a molecule that plays an important role in the circadian clock system. Therefore, to evaluate the association among the SIRT1 gene, schizophrenia and BP, we conducted a case-control study of Japanese population samples (1158 schizophrenia patients, 1008 BP patients and 2127 controls) with four tagging SNPs (rs12778366, rs2273773, rs4746720 and rs10997875) in the SIRT1 gene. Marker-trait association analysis was used to evaluate the allele and the genotype association with the χ(2) test, and haplotype association analysis was evaluated with a likelihood ratio test. We showed an association between rs4746720 in the SIRT1 gene and schizophrenia in the allele and the genotype analysis. However, the significance of these associations did not survive after Bonferroni's correction for multiple testing. On the other hand, the SIRT1 gene was associated with Japanese schizophrenia in a haplotype-wise analysis (global P(all markers) = 4.89 × 10(-15)). Also, four tagging SNPs in the SIRT1 gene were not associated with BP. In conclusion, the SIRT1 gene may play an important role in the pathophysiology of schizophrenia in the Japanese population.     

多药耐药基因1C3435T多态性与癫痫耐药的关联性研究

目的：探讨我国癫痫患者P-糖蛋白基因多态性（C3435T）与抗癫痫药物反应性的关联性。方法：采用PCR--RFLP（聚合酶链反应--限制性片段长度多态性分析）的方法对156例癫痫患者外周血进行分型。其中,耐药组癫痫患者85例,有效组癫痫患者71例。结果：耐药组癫痫患者CC基因型21例,占24.70%;有效组癫痫患者CC基因型19例,占26.76%。两组比较无显著差异性。结论：本研究未发现P-gp C3435T基因型与癫痫耐药的关联性。     

P-glycoprotein polymorphism in hypo- and hyper-thyroidism patients

P-glycoprotein (Pgp) is encoded by the multidrug resistance gene (MDR1) in humans and is the product of MDR1. It is expressed in various tissues and is related to drug distribution in intestinal erythrocytes, capillary endotel of brain, proximal tubules cells of kidneys and liver canalicular cells. Expression of Pgp is affected by Pgp polymorphism, and exon 26 C3435T polymorphism is the most common one. It has been thought that expression of Pgp is high in C-allele subjects and this situation is responsible for the resistance against some drugs and substances. Pgp may have a role in the distribution of thyroid hormones, drugs used for hypo- and hyperthyroidism and the resistance occurred. For this purpose possible relationship between T and C alleles and frequency of Pgp polymorphism as well as thyroid hormone distribution in patients with hypo- and hyperthyroidism was investigated. Thirty five hyperthyroidism patients diagnosed as Graves’ disease, 78 hypothyroidism patients diagnosed as Hashimoto’s thyroiditis and 100 healthy volunteers were included in the study. According to the results obtained no statistically significant difference was found in Pgp C3435T polymorphism between hypo- and hyperthyroidism patients. In addition, the serum free T3 levels of hyperthyroidism patients with C alleles was higher than those of subjects with T alleles. No statistically significant difference was seen in the CC, CT and TT genotype frequencies between the patients and control groups. In conclusion, it seems that Pgp polymorphism is not a predictor factor for the occurrence of hypo- and hyperthyroidism. There is a significant relationship between Pgp and the elevated serum free T3 levels of hyperthyroidism patients, and further research will help understand this situation.