人巨细胞病毒UL136基因在临床低传代分离株中多态性分析

目的 研究人巨细胞病毒(human cytomegalovirus，HCMV)UL136基因在临床低传代分离株中的多态性，探讨其多态性与HCMV先天性感染不同致病性之间的关系。方法 对48株经荧光定量PCR方法检测HCMV DNA为阳性的临床低传代分离株进行HCMV ULl36全序列PCR扩增，对于扩增阳性的12株PCR产物进行ULl36基因全序列测定及结果分析。结果 48株临床低传代分离株ULl36 PCR扩增，12株阳性，阳性率25％，以HCMV Toledo株作为参考株，进行序列比较分析表明，12株临床分离株ULl36开放阅读框架(open reading frame，ORF)长度均与Toledo株相同，为723bp，编码241个氨基酸的蛋白。DNA序列变异均为碱基替换，不同临床分离株ULl36基因与Toledo株进行同源性比较，结果在核苷酸水平为97．7％～99．3％，氨基酸水平为96．6％～99．1％。ULl36编码蛋白的氨基酸变异率为0．83％～3．3％。二级结构预测分为两种构象。大多数HCMV ULl36蛋白翻译后修饰位点在所有分离株中均高度保守，仅几个位点在一些分离株中存在缺失或新增。Toledo株及12株临床分离株核苷酸及氨基酸序列系统进化树分析表明：45J最接近Toledo株。结论 12株临床低传代分离株HCMV ULl36基因DNA及其编码产物的氨基酸序列比较保守，但仍存在一定多态性。未发现不同临床分离株ULl36基因多态性与HCMV先天性感染的表现关系。     

CYP1A1基因多态性与急性淋巴细胞白血病的关系

目的　探讨CYP1A1基因多态性与急性淋巴细胞白血病 (ALL)遗传易感性的关系。方法　应用PCR -RFLP、ASA技术 ,分析 78例ALL患者和 112例健康人CYP1A1基因多态性 ,比较ALL患者与对照组间频率差异。结果　ALL组CYP1A1MspI基因多态位点 ,各等位基因和基因型频率与对照组比较有显著性差异 (P <0 .0 5 ) ,其中等位基因m2使患ALL的危险度提高了 1.5 4倍 ,m1m2、m2m2基因型使患ALL的危险度分别提高了 2 .2 7倍和 2 .77倍 ;ALL组CYP1A1Ile-Val各等位基因和基因型频率与对照组比较无显著性差异 (P >0 .0 5 )。结论　CYP1A1MspI基因多态可能与ALL的发生有关。     

怀化籍汉族人群亚甲基四氢叶酸还原酶基因多态性研究

目的探讨湖南怀化汉族人亚甲基四氢叶酸还原酶(MTHFR)基因的分布特征,并与其它地区人群进行比较。方法采用限制性内切酶片段长度多态(RFLP)技术检测120例健康个体的MTHFR基因的分布情况,并结合文献进行了与其它地区与民族的MTHRF分析比较。结果怀化汉族人MTHFR基因中有三种基因型T/T、T/C和C/C,其频率分别是12.5%、34.2%和53.3%。MTHFR基因T频率是0.296,基因C频率是0.704。结论怀化汉族人与其它地区人种MTHFR基因的分布规律有差异。     

Support for the involvement of the ERBB4 gene in schizophrenia: A genetic association analysis

Cellular, animal and human studies support the involvement of aberrant NRG–ErbB signaling in the pathogenesis of schizophrenia. The aim of the present study was to examine whether genetic variation in the human ERBB4 gene is associated with susceptibility to schizophrenia. Two hundred and twenty-seven unrelated chronic inpatients with schizophrenia were enrolled in the study, and the genetic variation in the polymorphisms of the ERBB4 gene in the patients was compared with that of the control group, which consisted of 223 subjects free of psychiatric illness. The results showed that one coding-synonymous polymorphism (rs3748962, Val1065Val) was in genotypic (p = 0.0027) and allelic (p = 0.0007) association with schizophrenia. In comparison with subjects of the rs3748962-TT type, those of the rs3748962-CT and rs3748962-CC types were at 1.74- and 2.64-fold greater risk of schizophrenia (CT vs. TT: OR = 1.71 (95% CI = 1.15–2.53), p = 0.0014; CC vs. TT: OR = 2.64 (95% CI = 1.37–5.23), p = 0.0047), which supports the hypothesis of an additive model of transmission (p = 0.0006). Furthermore, the frequency of haplotype ATC of rs3791709–rs2289086–rs3748962 was found to be significantly higher in the patients with schizophrenia than in the controls (case vs. control = 36.0% vs. 24.4%, permutation p-value = 0.0002). The findings support the involvement of the ERBB4 gene in schizophrenia in Han Chinese.     

ACE和AT1R基因多态性与原发性高血压易感性及与替米沙坦降压疗效的关系

目的 研究ACE基因和AT1R基因A1166C多态性与湖南地区汉族原发性高血压(PH)的关系及与替米沙坦的降压疗效关系.方法 利用聚合酶链反应-限制性片断长度多态性(PCR-RFLJ))对湖南地区汉族285例健康对照者(CON组)和246例原发性高血压(PH)患者(PH组)ACE插入和(或)缺失(I/D)突变和AT1R A1166C等位基因突变进行检测,分析两组问基因型和等位基因的频率分布.给予PH组中替米沙坦治疗12周,观察服药前后的疗效.采用Logistic多元回归分析基因多态性与PH的相关性.结果 PH组ACE基因型分布为DD 25.2%(62/246)、ID 27.6%(68/246)、II47.2%(116/246);AT1R基因型分布为从61.4%(151/246)、AC 31.3%(77/246)、CC 7.3%(18/246),其中ID和AC基因型与CON组差异有统计学意义(P<0.05);D、I等位基因频率与CON组差异无统计学意义(P>0.05);A、C与CON组差异有统计学意义(P<0.05).替米沙坦治疗12周后,ACE基因DD型与ID型降压疗效显著优于II型,收缩压分别下降(26.31±9.16)mm Hg、(22.92±10.21)mm Hg和(15.67±8.94)mm Hg,mm Hg=0.133 kPa,P<0.05.AT1R基因AA型降压疗效优于AC+CC基因型,收缩压分别下降(15.00±8.64)mm Hg和(10.37±8.04)mn Hg,舒张压分别下降(14136±6.01)mm Hg和(8.83±5.93)mm Hg,均P<0.05.AT1R基因AC基因型是PH的独立危险因素.结论 ACE和AT1R基因多态性与湖南地区汉族人PH具有一定关系.携带ACE D和AT1R1622A等位基因的PH患者对替米沙坦的降压反应较好.     

雌激素受体α基因Pvu Ⅱ和Xba Ⅰ酶切多态性与冠心病相关性

目的 探讨中国人群中雌激素受体(ER)α基因Pvu Ⅱ和Xba Ⅰ酶切多态性与冠心病(CAD)的相关性.方法 将2004年4月至2006年12月在中山大学附属第五医院心内科住院的中国南方汉族CAD患者236例为病例组,117例选自健康体检者或同期在我院住院的非CAD患者为对照组,应用聚合酶链反应-限制片断长度多态性(PCR-RFLP)分析的方法,检测CAD组和对照组的ERα基因型,比较其与相关指标的关系.结果 ERα酶切多态性分析结果显示Pvu Ⅱ存在PP、Pp、pp 3种基因型;Xba Ⅰ酶切也可区分出XX、Xx、xx 3型.Pvu Ⅱ多态性中,CAD组P等位基因型频率也显著高于对照组[42.2%(199/472)比33.8%(79/234),P=0.032],pp基因型的高密度脂蛋白水平显著高于P等位基因携带者,两组之间基因型分布差异具有统计学意义(P=0.041),X等位基因在对照组和CAD组分别为16.5%(78/472)和16.2%(38/234),两组基因型和等位基因频率差异均无统计学意义.结论 中国南方汉族人群中ERαPvu Ⅱ酶切多态性与CAD有关,P等位基因可能是CAD独立遗传危险因素;ERα Xba Ⅰ酶切多态性与CAD未发现相关.     

Influence of Transforming Growth Factor-��1 Gene Polymorphism at Codon 10 on the Development of Cirrhosis in Chronic Hepatitis B Virus Carriers

Transforming growth factor (TGF)-β1 is a key cytokine producing extracellular matrix. We evaluated the effect of TGF-β1 gene polymorphism at codon 10 on the development of cirrhosis in patients with chronic hepatitis B. One hundred seventy eight patients with chronic hepatitis (CH, n=57) or liver cirrhosis (LC, n=121), who had HBsAg and were over 50 yr old, were enrolled. The genotypes were determined by single strand conformation polymorphism. There were no significant differences in age and sex ratio between CH and LC groups. HBeAg positivity and detection rate of HBV DNA were higher in LC than in CH groups (P=0.055 and P=0.003, respectively). There were three types of TGF-β1 gene polymorphism at codon 10: proline homozygous (P/P), proline/leucine heterozygous (P/L), and leucine homozygous (L/L) genotype. In CH group, the proportions of P/P, P/L, and L/L genotype were 32%, 51%, and 17%, respectively. In LC group, the proportions of those genotypes were 20%, 47%, and 33%, respectively. The L/L genotype was presented more frequently in LC than in CH groups (P=0.017). Multivariate logistic regression analysis confirms that detectable HBV DNA (odds ratio [OR]: 3.037, 95% confidence interval [CI]: 1.504-6.133, P=0.002) and L/L genotype (OR: 3.408, 95% CI: 1.279-9.085, P=0.014) are risk factors for cirrhosis.     

The Val66Met polymorphism of the brain-derived neurotrophic-factor gene is associated with geriatric depression

Brain-derived neurotrophic-factor (BDNF), the most abundant of the neurotrophins in the brain, has been implicated in both major depression and cognitive function. This study examines the association between the BDNF-gene Val66Met polymorphism and depression susceptibility and severity, age-of-onset, cognitive function and suicidal attempt history in an elderly Chinese sample population. We genotyped the BDNF-gene Val66Met polymorphism in 110 elderly inpatients diagnosed with major depression and 171 age- and sex-similar control subjects. All patients were assessed with the Hamilton Rating Scale for Depression (HAM-D) for depression severity and the Mini-Mental Status Examination (MMSE) for cognitive function after admission. Suicide attempt history and age-of-onset of depression were evaluated by interview and medical record. The BDNF Val66Met genotype distribution was significantly different between depressed patients and control subjects (P = 0.003) and there was a significant excess of Met allele in the depressed patients compared to the control group (P = 0.001). The BDNF polymorphism did not affect age-of-onset, depression severity, cognitive function or suicidal attempt history. The results suggest that the BDNF Val66Met polymorphism is a relevant risk factor for geriatric depression.     

Analysis of the monocyte chemoattractant protein 1 -2518 promoter polymorphism in Korean patients with alopecia areata

Monocyte chemoattractant protein-1 (MCP-1) levels are increased in scalp lesions of patients with alopecia areata (AA), suggesting a role in the development of AA. Recently, a biallelic A/G polymorphism in the MCP-1 promoter at position -2518 has been found, influencing the level of MCP-1 expression in response to an inflammatory stimulus. We investigated whether the presence of these polymorphisms were associated with AA in Korean population. 145 Korean patients with AA, 246 healthy subjects without clinical evidence of AA were screened for genotype with a PCR-based assay. In the AA patients the frequency of the A and G alleles was 40.3 and 59.7%, respectively and the distribution of the A/A, A/G and G/G genotypes was 19.3, 42.1 and 38.6%, respectively. Amongst the controls the frequency of the A and G alleles was 39.8 and 60.2%, and the distribution of the A/A, A/G, G/G genotypes in the same group was 17.5, 44.7 and 37.8%, respectively. There was no significant difference in the allele frequencies and genotype distributions between the patients and the controls (p=0.889, p=0.848, respectively). Our data indicates that no association exists between the -2518A/G polymorphism of the MCP-1 gene and susceptibility to alopecia areata.     

Association study of semaphorin 7a (sema7a) polymorphisms with bone mineral density and fracture risk in postmenopausal Korean women

Bone mineral density (BMD), the major factor determining bone strength, is closely related to osteoporotic fracture risk and is determined largely by multiple genetic factors. Semaphorin 7a (SEMA7A), a recently described member of the semaphorin family, has been shown to play a critical role in the activation of monocyte/macrophages that share progenitors with bone-resorbing osteoclasts and thus might contribute to osteoclast development. In the present study, we directly sequenced the SEMA7A gene in 24 Korean individuals, and identified 15 sequence variants. Five polymorphisms (+15667G>A, +15775C>G, +16285C>T, +19317C>T, +22331A>G) were selected and genotyped in postmenopausal Korean women (n=560) together with measurement of the areal BMD (g/cm²) of the anterior-posterior lumbar spine and the non-dominant proximal femur using dual-energy X-ray absorptiometry. We found that polymorphisms of the SEMA7A gene were associated with the BMD of the lumbar spine and femoral neck. SEMA7A+15775C>G and SEMA7A+22331A>G were associated with low BMD of the femoral neck (P=0.02) and lumbar spine (P=0.04) in a recessive model. SEMA7A-ht4 also showed an association with risk of vertebral fracture (OR=1.87–1.93, P=0.02–0.03). Our results suggest that variations in SEMA7A may play a role in decreased BMD and risk of vertebral fracture.Electronic Supplementary Material Supplementary material is available for this article at and is accessible for authorized usersJung-Min Koh and Bermseok Oh contributed equally to this work