RAD51-G135C和XRCC3-C241T单核苷酸多态性与急性髓系白血病发病相关性研究

目的:探讨RAD51-G135C和XRCC3-C241T单核苷酸多态性与急性髓系白血病(AML)发病的相关性。方法:研究分为两组:AML患者组(545例AML患者的外周血样本)和对照组(1 034名与患者无血缘关系的正常人的外周血样本),分别抽提2组基因组DNA,通过Taq Man探针实时荧光定量PCR技术分析RAD51-G135C和XRCC3-C241T基因多态性,并分析两者多态性与急性髓系白血病发病相关性。结果:与对照组相比,RAD51-G135C纯合变异型(CC)可显著增加AML患者的发病风险(OR=3.07),而RAD51-G135C杂合变异型(GC)与AML发病无统计学相关性。XRCC3-C241T纯合变异型(TT)与AML发病尚无统计学相关性,而XRCC3-C241T杂合变异型(CT)却可增加AML患者的发病风险(OR=0.66)。结论:RAD51-G135C纯合变异型和XRCC3-C241T杂合变异型显著增高AML的发病风险,对AML的发病更有预测价值。     

RAD51G135C和XRCC3C241T多态性与急性髓系白血病和骨髓增生异常综合征的发生及其染色体异常相关性研究

目的探索同源重组修复基因RAD51和XRCC3多态性与急性髓系白血病（AML）、骨髓增生异常综合征（MDS）发生及染色体异常之间的关系。方法对306例AML患者、52例MDS患者和458名与患者无血缘关系的正常人，用聚合酶链反应-限制性内切酶片段长度多态性（PCR—RFLP）方法分析RAD51、XRCC3、NQ01基因型，用多重PCR方法检测GSTF1和GSTM1基因型。结果AML患者RAD51G135CG／C基因型比例（35．3％）与正常对照组（26．9％）比较差异有统计学意义（P=0．023），RAD51cmcG／C基因型患AML的相对风险性（OR值）为1．441（95％CI：1．052～1．973）。inV（16）和（或）t（16；16）／CBFB-MYH11（＋）患者，XRCC3G241T，杂合子基因型的比例（41．2％）明显高于正常对照组（10．0％）（P=0．000），XRCC3C241T，杂合子基因型患inv（16）和（或）t（16；16）AML的OR值为6．133（95％CI：2．227—16．887，P=0．000）；且不同基因之间有显著的协同效应，XRCC3C241T，和RAD51G135C同时为变异基因型，0R值增高至8．697，在此基础上同时GSTM1为缺失型，OR值增至12．656，同时NQ01C609-为变异基因型，0R值增至17．091。MDS患者RAD51cⅢc和XRCC3。㈨，各基因型比例与正常对照组比较差异无统计学意义。结论XRCC3C241T，基因型与inv（16）和（或）t（16；16）／CBFB—MYH11（＋）AML发生高度相关，此相关性与XRCC3C241T，和RAD51C135C之间，及与GSTM1和NQ01C509-基因之间存在显著的协同效应。RAD51G135C和XRCC3C241T基因型与MDS发生及MDS染色体异常之间未发现有相关性。     

IKZF3基因单核苷酸多态性与儿童急性淋巴细胞白血病的关系

目的:探讨IKAROS家族锌指蛋白3(IKZF3)基因单核苷酸多态性与儿童急性淋巴细胞白血病(ALL)发病风险的关系.方法:收集286例ALL患儿以及382例健康儿童的外周血样本,分别作为ALL组和对照组.采用TaqMan探针实时定量PCR技术检测IKZF3基因rs62066988 C＞T和rs12946510 C＞T...     

GSTT1、GSTM1、NQO1、RAD51和XRCC3基因多态性与慢性粒细胞白血病发生关系的研究

目的探讨GSTT1、GSTM1、NQO1、RAD51和XRCC3基因多态性与我国慢性粒细胞白血病(CML)发生遗传易感之间的关系。方法共120例CML患者和458名与患者无血缘关系的正常人,用多重PCR方法检测GSTT1和GSTM1基因型,用PCR-RFLP方法分析RAD51,XRCC3,NQO1基因型。结果CML患者GSTT1和GSTM1缺失型比例分别为50.8%和59.2%,与正常对照组无显著差异(分别为42.8%和53.1%)。CML患者NQO1C/T和T/T基因型的比例(60.0%)、RAD51G135CG/C基因型比例(26.9%)和XRCC3-241Met杂合子缺失型(Thr/Met)的比例(9.2%)均与正常对照组(分别为65.3%,12.4%和9.2%)无统计学差异。结论本研究结果提示GSTT1、GSTM1、NQO1、RAD51和XRCC3基因型与我国CML的发生无显著相关性。     

RAD51-G135C和XRCC3-C241T多态性与伴重现染色体易位急性髓系白血病发生的关系

目的 探讨DNA同源重组修复基因RAD51-G135C和XRCC3-C241T多态性与伴重现染色体易位急性髓系白血病(AML)发生的关系.方法 共收集625例初治原发性AML患者的骨髓、806名患者一级亲属和704名与患者无血缘关系正常人的外周血样本,常规提取基因组DNA.用聚合酶链反应-限制性片段长度多态性(PCR-RFLP)方法分析RAD51-G135C和XRCC3-C241T基因多态性.选取XRCC3-C241T不同基因型细胞系进行体外照射,用TaqMan实时定量PCR法检测CBFβ-MYH11融合基因mRNA的相对表达量.结果 同正常人和一级亲属比较,XRCC3-C241T变异基因型(C/T+T/T)能明显提高inv(16)/t(16;16)/CBFβ-MYH11(+)AML的发病风险,风险值分别提高了6.22倍(P<0.001)和6.99倍(P<0.001);同正常人和一级亲属比较,RAD51-G135C纯合变异基因型(C/C)亦能明显提高inv(16)/t(16;16)/CBFβ-MYH11(+)AML的发病风险,风险值分别提高了0.87倍(P=0.010)和1.15倍(P=0.001).经照射后,XRCC3-C241T纯合变异型HL-60细胞系CBFβ-MYH11融合基因mRNA表达量是野生型KG1a细胞系的59.49倍.RAD51-G135C和XRCC3-C241T多态性位点基因型与t(15;17)/PML-RARα(+)AML、t(8;21)/AMLI-ETO(+)AML和11q23异常AML发生风险无明显相关性.结论 XRCC3-C241T变异基因型和RAD51-G135C纯合变异基因型可显著增高inv(16)/t(16;16)/CBFβ-MYH11(+)AML发生的风险.

Abstract：

Objective To investigate the relationship between DNA homologous recombination (HR) repair genes RAD51-G135C/XRCC3-C241T polymorphisms and development of acute myeloid leukemia (AML) with recurrent chromosome translocation. Methods Genomic DNA was extracted from bone marrow cells of 625 de novo AML patients and peripheral blood cells of 806 patient family members and 704 unrelated volunteers. Genotypes of RAD51-G135C and XRCC3-C241T were analyzed by PCR-RFLP. Cell lines with genotypes differed from XRCC3-C241T were selected and irradiated in vitro. The CBFβ-MYH11 fusion gene was detected by TaqMan real-time PCR. Results The XRCC3-C241T variant (C/T + T/T)showed 6. 22-fold and 6.99-fold increase in the risk of developing the AML with inv( 16)/t( 16;16)/CBFβ-MYH11 as compared with the volunteer and family member controls respectively; the RAD51-G135C homozygote-type (C/C) variant showed 0. 87-fold( P =0. 010) and 1. 15-fold(P =0.001) respectively increase in the risk of this subtype AML. In the irradiated group, the CBFβ-MYH11 mRNA level in HL-60 cells was 59.49 times increased than that in KG1a cells. However, the RAD51-G135C and XRCC3-C241T variants had no correlations with the risk of development of t( 15; 17)/PML-RARα( + ) AML,t(8;21 )/AML1-ETO( + )AML and 11 q23 AML subtypes. Conclusion The XRCC3-C241T variant and the RAD51-G135C homozygote-type significantly increase the risk of the development of AML with inv( 16)/t( 16;16)/CBFβ-MYH11.     

XRCC3基因Thr241Met(rs861539)位点单核苷酸多态性与鼻咽癌的相关性

目的:研究XRCC3基因Thr241Met (C/T,rs861539)位点多态性与广东鼻咽癌的相关性.方法:应用PCR方法对127例广州鼻咽癌患者和117例健康对照人群的DNA标本rs861539位点进行扩增、纯化及测序,再结合人群临床资料进行统计学分析.结果:rs861539 C＞T,其中杂合型C/T基因型频率在对照组中分布较高(OR=0.473,95％ CI=0.244～ 0.917,P＜0.05);经年龄及性别分层分析,杂合子在年龄≤30岁(OR＝0.071,95％ CI=0.007～0.722,P＜0.05)以及男性(OR=0.469,95％ CI=0.232～0.947,P＜0.05)人群中在对照组分布较高;而在年龄＞ 30岁以及女性人群中两组间分布均无统计学差异.纯和突变型T/T基因型在两组间分布差异无显著性(OR=1e9,95％ CI=0～∞,P＞0.05),经年龄及性别分层分析,在两组间仍无统计学差异.结论:XRCC3基因Thr241Met (C/T,rs861539)基因多态性可能与鼻咽癌易感性无显著相关性.     

Cyclin D1基因多态性和儿童急性淋巴细胞性白血病相关性研究

目的 探讨细胞周期素 D1(Cyclin D1)基因A870G多态性和儿童急性淋巴细胞白血病之间的相关性.方法 应用聚合酶链反应-限制性片段长度多态性(PCR-RFLP)检测118例急性淋巴细胞白血病患儿(实验组)和160例健康儿童(对照组)的Cyclin D1 A870G基因型,比较两组基因型频率和等位基因频率.结果 实验组基因型频率为AA型30.51%、AG型50%、GG型19.49%,对照组基因型频率为AA型20.63%、Aa型47.5%、GG型31.67%,差异均有统计学意义(P<0.05).实验组等位基因A、G的分布频率依次为55.51%、44.49%,对照组等位基因A、G的分布频率依次为44.38%、55.62%,差异均有统计学意义(P<0.05).B细胞型患儿基因型频率为AA型50%、AG型41.67%、GG型8.33%,T细胞型患儿基因型频率为AA型25.53%、AG型52.13%、GG型22.34%,差异有统计学意义(P<0.05).结论 Cyclin D1基因A870G位点多态性与儿童急性淋巴细胞白血病发病的易感性存在相关性.     

RAD51-G135C和XRCC3-C241T多态性与inv(16)/t(16;16)/CBFβ-MYH11阳性急性髓系白血病预后的关系

目的 探讨DNA同源重组修复基因RAD51-G135C和XRCC3-C241T多态性与inv(16)/t(16;16)/CBβ-MYH11阳性急性髓系白血病(AML)患者预后之间的关系.方法 对染色体核型可供分析且随访资料完整的103例初治原发性inv(16)/t(16;16)/CBβ-MYH11阳性AML患者进行回顾性分析.用聚合酶链反应-限制性片段长度多态性(PCR-RFLP)方法检测患者RAD51-G135C、XRCC3-C241T基因多态性.采用单因素(包括性别、初诊时年龄、白细胞计数、血小板计数、血红蛋白含量、染色体核型、KIT基因突变、RAD51-G135C和XRCC3-C241T基因多态性)和多因素分析方法评估患者完全缓解(CR)率、总体生存(OS)率和无复发生存(RFS)率的影响因素.结果 全部患者中位随访时间为28(1-106)个月,总体CR率为92.2%,预期5年OS率和RFS率分别为43.6%(95%CI 37.7%-49.5%)和26.4%(95%CI 21.1%-31.7%),预期中位OS时间和RFS时间分别为53.0(95%CI 33.4～72.7)个月和27(95%CI 22.9-31.1)个月.多因素分析结果显示:高白细胞计数(P=0.004)和年龄＞30岁(P=0.035)是与CR率有关的独立不良预后因素,XRCC3-C241T变异基因型(P=0.007)和高白细胞计数(P=0.009)是与RFS率有关的独立不良预后因素,高白细胞计数(P=0.002)和伴有+8染色体核型异常(P=0.035)是与OS率有关的独立不良预后因素;而RAD51-G135C基因型对此类白血病的预后无明显影响.结论 XRCC3-C241T变异基因型是inv(16)/t(16;16)/CBFβ-MYH11阳性AML一个独立的不良预后因素.

Abstract：

Objective To investigate the impact of polymorphisms of DNA homologous recombination (HR) repair genes RAD51-G135C and XRCC3-C241T on the prognosis of acute myeloid leukemia(AML)with inv(16)/t(16;16)(CBFβ-MYH11).Methods One hundred and three de novo inv( 16)/t(16;16)(CBFβ-MYH11) AML patients were followed-up and retrospectively analyzed.Polymorphisms of RAD51-G135C and XRCC3-C241T were detected by PCR-RFLP.The prognostic factors,including sex, age, white blood cell count, platelet count, hemoglobin level, karyotype, KIT mutation, RAD51-G135C and XRCC3-C241T polymorphisms at diagnosis, for complete remission (CR) achievement, overall survival (OS) and relapse-free survival (RIPS) were analyzed by univariate and multivariate analyses.Results The median follow-up of all patients was 28 (1 - 106) months.The overall CR rate was 92.2%.The estimated 5-year OS and RFS rates were 43.6% (95 % CI 37.7 % - 49.5 % ) and 26.4% (95% CI 21.1% - 31.7% ), and the median OS and RFS were 53 (95%CI33.4 -72.7) and 27 (95%CI22.9 -31.1) months, respectively.In multivariate analysis, higher WBC ( P = 0.004) and older than 30 years of age ( P = 0.035 ) were independent poor factors for CR achievement, the XRCC3-241T variant (P =0.007) and higher WBC (P =0.009)were independent poor factors for 5-year RFS,and higher WBC(P=0.002)and trisomy 8(P=0.035)were independent poor factors for 5-year survival.Polymorphism of RAD5 1-G135C had no significant impact on the prognosis.Conclusion The XRCC3-241T variant is an independent poor prognostic factor for AML with inv(16)/t(16;16)/CBFβ-MYH11.     

IL-10基因单核苷酸多态性与急性淋巴细胞白血病易感性的相关性研究

目的 探讨IL-10基因单核苷酸多态性与ALL发病易感性的关系.方法 选取2007年1月至2009年12月北京大学第一医院、北京市道培医院115例ALL缓解患者,同时选取323名体检健康者作为对照组.采集ALL患者的骨髓以及健康对照者的外周血标本,提取DNA.设计IL-10启动子区-819C/T、-592A/C引物做PCR,应用限制性内切酶Msl Ⅰ、HpyCH4Ⅲ分析其限制性片段长度多态性,并测序验证;同时分析IL-10基因-819位点、-592位点各基因型构成及等位基因在ALL患者组和健康对照组间的差异.用实时定量PCR检测ALL患者EB病毒DNA和BCR/ABL融合基因,分析IL-10基因-819位点、-592位点各基因型构成及等位基因在EB病毒阳性和阴性组间、BCR/ABL融合基因阳性和阴性组间的差异.结果 ALL患者组IL-10基因-819位点的-819CC、-819TT、-819CT基因型比例分别为14.8%(17/115)、45.2%(52/115)、40.0%(46/115),-592位点的-592AA、-592CC、-592AC基因型比例分别为43.5%(50/115)、16.5%(19/115)、40.0%(46/115);健康对照组-819位点的-819CC、-819TT、-819CT基因型比例分别为9.9%(32/323)、16.4%(53/323)、73.7%(238/323),-592位点的-592AA、-592CC、-592AC基因型比例分别为11.8%(38/323)、15.5%(50/323)、72.8%(235/323),ALL患者组与健康对照组间-819和-592位点基因型构成差异均有统计学意义(x2值分别为46.000和54.550,P均＜0.05＝.ALL患者组-819T等位基因比例为65.2%(150/230),-592A等位基因比例为63.5%(146/230),而健康对照组分别为53.5%(344/646)和48.1%(311/646),差异均有统计学意义(x2值分别为9.877和15.986,P均＜0.05＝.ALL患者中42例检测了EB病毒DNA,其中EB病毒阳性22例,EB病毒阴性20例.EB病毒阳性组-819位点的-819CC、-819TT、-819CT基因型比例分别为9.1%(2/22)、40.9%(9/22)、50.0%(11/22),-592位点的-592AA、-592CC、-592AC基因型比例分别为31.8%(7/22)、13.6%(3/22)、54.5%(12/22),EB病毒阴性组分别为35.0%(7/20)、45.0%(9/20)、20.0%(4/20)和35.0%(7/20)、45.0%(9/20)、20.0%(4/20),2组基因型构成差异均无统计学意义(P均＞0.05).ALL患者中36例进行了BCR/ABL融合基因检测,其中阳性20例,阴性16例.BCR/ABL融合基因阳性组-819位点的-819CC、-819TT、-819CT基因型比例分别为0%(0/20)、45.0%(9/20)、55.0%(11/20),-592位点的-592AA、-592CC、-592AC基因型比例分别为45.0%(9/20)、5.0%(1/20)、50.0%(10/20),BCR/ABL融合基因阴性组分别为18.8%(3/16)、50.0%(8/16)、31.3%(5/16)和50.0%(8/16)、18.8%(3/16)、31.3%(5/16),2组基因型构成差异均无统计学意义(P均＞0.05).结论 IL-10基因-819位点TT基因型和-592位点AA基因型人群易患ALL.

Abstract：

Objective To observe the relationship of IL-10 gene single nucleotide polymorphism and the susceptibility to ALL. Methods The bone marrow and peripheral blood samples from 115 ALL patients and 323 healthy controls were collected in Peking University First Hospital and Beijing Dao-pei Hospital from January 2007 to December 2009. The DNA were extracted from all samples. The primers of -819C/T and -592A/C in the promoter region of IL-10 gene were designed for the PCR. The restrictive fragment length polymorphism of IL-10 gene was analyzed by using restrictive enzyme Msl Ⅰ and HpyCH4 Ⅲ.Sequencing was done in part of these samples to confirm the results of PCR. The differences of genotypes and allele ratio of -819 and -592 sites were analyzed between the ALL patients and healthy controls. Real-time quantitative PCR was performed to detect the EB virus (EBV) infection and the expression of BCR/ABL fusion gene. The differences of genotypes and allele ratio of -819 and -592 sites were analyzed between the positive and negative group. Results The genotype ratios of -819CC, -819TT, - 819CT, -592AA,- 592CC and - 592AC were 14. 8% ( 17/115 ), 45.2% ( 52/115 ), 40. 0% ( 46/115 ), 43.5% ( 50/115 ),16. 5% ( 19/115 ), 40. 0% ( 46/115 ) in ALL patients, and were 9. 9% ( 32/323 ), 16. 4% ( 53/323 ),73.7% ( 238/323 ), 11.8% ( 38/323 ), 15.5% ( 50/323 ), 72. 8% ( 235/323 ) in the healthy controls,respectively. The genotypes of -819 and -592 sites had statistically significant differences between the two groups(x2 values were 46.000 and 54.550, all P ＜ 0. 05 ). The allele ratio of -819T and -592A were (65.2%, 150/230) and (63.5%, 146/230) in ALL patients, while they were 53.5% (344/646) and 48. 1% (311/646)in the healthy controls. There were statistically significant differences between the two groups (x2 values were 9. 877 and 15.986, all P ＜ 0. 05 ). The EBV DNA were detected in 42 ALL patients,among which 22 were positive and 20 were negative. The genotype ratios of -819CC, -819TT, -819CT,-592AA, - 592CC, - 592AC in EBV positive group were 9. 1% ( 2/22 ), 40. 9% ( 9/22 ), 50. 0%(11/22) ,31.8% ( 7/22 ), 13.6% ( 3/22 ), 54. 5% ( 12/22 ), while they were 35.0% ( 7/20 ), 45.0%(9/20) ,20. 0% (4/20) ,35.0% (7/20) ,45.0% (9/20) ,20. 0% (4/20) in the EBV negative group. The genotypes of -819 and -592 sites showed no statistical differences between the two groups( all P ＞ 0. 05 ).The BCR/ABL fusion gene were detected in 36 ALL patients, among which 20 were positive and 16 were negative. The genotype ratios of - 819CC, - 819TT, - 819CT, - 592AA, - 592CC, - 592AC in BCR/ABL positive group were 0% (0/20) ,45.0% (9/20) ,55.0% ( 11/20), 45. 0% (9/20) ,5.0% (1/20) ,50. 0%( 10/20), while they were 18. 8% ( 3/16 ), 50. 0% ( 8/16), 31.3% ( 5/16 ), 50. 0% ( 8/16 ), 18. 8%(3/16), 31.3 % (5/16)in the BCR/ABL negative group. The genotypes of -819 and -592 sites showed no statistical differences between the two groups ( all P ＞ 0. 05 ). Conclusion The population with - 819TT and - 592AA genotype of IL-10 gene shows susceptibility to ALL.     

IL-10基因单核苷酸多态性与急性淋巴细胞白血病易感性的相关性研究

Objective To observe the relationship of IL-10 gene single nucleotide polymorphism and the susceptibility to ALL. Methods The bone marrow and peripheral blood samples from 115 ALL patients and 323 healthy controls were collected in Peking University First Hospital and Beijing Dao-pei Hospital from January 2007 to December 2009. The DNA were extracted from all samples. The primers of -819C/T and -592A/C in the promoter region of IL-10 gene were designed for the PCR. The restrictive fragment length polymorphism of IL-10 gene was analyzed by using restrictive enzyme Msl Ⅰ and HpyCH4 Ⅲ.Sequencing was done in part of these samples to confirm the results of PCR. The differences of genotypes and allele ratio of -819 and -592 sites were analyzed between the ALL patients and healthy controls. Real-time quantitative PCR was performed to detect the EB virus (EBV) infection and the expression of BCR/ABL fusion gene. The differences of genotypes and allele ratio of -819 and -592 sites were analyzed between the positive and negative group. Results The genotype ratios of -819CC, -819TT, - 819CT, -592AA,- 592CC and - 592AC were 14. 8% ( 17/115 ), 45.2% ( 52/115 ), 40. 0% ( 46/115 ), 43.5% ( 50/115 ),16. 5% ( 19/115 ), 40. 0% ( 46/115 ) in ALL patients, and were 9. 9% ( 32/323 ), 16. 4% ( 53/323 ),73.7% ( 238/323 ), 11.8% ( 38/323 ), 15.5% ( 50/323 ), 72. 8% ( 235/323 ) in the healthy controls,respectively. The genotypes of -819 and -592 sites had statistically significant differences between the two groups(x2 values were 46.000 and 54.550, all P ＜ 0. 05 ). The allele ratio of -819T and -592A were (65.2%, 150/230) and (63.5%, 146/230) in ALL patients, while they were 53.5% (344/646) and 48. 1% (311/646)in the healthy controls. There were statistically significant differences between the two groups (x2 values were 9. 877 and 15.986, all P ＜ 0. 05 ). The EBV DNA were detected in 42 ALL patients,among which 22 were positive and 20 were negative. The genotype ratios of -819CC, -819TT, -819CT,-592AA, - 592CC, - 592AC in EBV positive group were 9. 1% ( 2/22 ), 40. 9% ( 9/22 ), 50. 0%(11/22) ,31.8% ( 7/22 ), 13.6% ( 3/22 ), 54. 5% ( 12/22 ), while they were 35.0% ( 7/20 ), 45.0%(9/20) ,20. 0% (4/20) ,35.0% (7/20) ,45.0% (9/20) ,20. 0% (4/20) in the EBV negative group. The genotypes of -819 and -592 sites showed no statistical differences between the two groups( all P ＞ 0. 05 ).The BCR/ABL fusion gene were detected in 36 ALL patients, among which 20 were positive and 16 were negative. The genotype ratios of - 819CC, - 819TT, - 819CT, - 592AA, - 592CC, - 592AC in BCR/ABL positive group were 0% (0/20) ,45.0% (9/20) ,55.0% ( 11/20), 45. 0% (9/20) ,5.0% (1/20) ,50. 0%( 10/20), while they were 18. 8% ( 3/16 ), 50. 0% ( 8/16), 31.3% ( 5/16 ), 50. 0% ( 8/16 ), 18. 8%(3/16), 31.3 % (5/16)in the BCR/ABL negative group. The genotypes of -819 and -592 sites showed no statistical differences between the two groups ( all P ＞ 0. 05 ). Conclusion The population with - 819TT and - 592AA genotype of IL-10 gene shows susceptibility to ALL.     

MPO、NQO1基因多态性与急性白血病易感性的相关研究

本研究旨在探讨髓过氧化物酶（MPO）和醌氧化还原酶1（NQ01）基因多态性与中国甘肃人群急性白血病易感性的关系。用1：1配对病例一对照研究和连接酶检测反应（LDR）分型方法分析急性白血病病例组（150例）和对照组（150例无癌住院患者）MPO和NQ01的基因多态性,比较不同基因型与急性白血病易感性的关系。结果表明,病例组MPO-463A等位基因分布频率低于对照组,MPO（G-463A）各基因型在病例组与对照组中的分布差异显著（妒=11．828,P〈0．05,OR=0．368,95％CI=0．205-0．610）。病例组NQ01-609T等位基因分布频率高于对照组,NQ01（C-609T）各基因型在病例组与对照组中的分布差异显著（X^2=17．931,P〈0．05,OR=1．428,95％CI=1．237-3．339）。基因多态联合作用分析显示,MPO野生型兼具NQ01野生型者发生急性髓系白血病的风险降低至33．6％。结论：MPO、NQ01与急性白血病易感性相关,携带MPO（G-463A）突变基因型（GA／AA）可降低白血病的发病风险,携带NQ01（C-609T）突变基因型（TC／TY）可增加白血病的发病风险,MPO野生型与NQ01野生型者联合作用可进一步降低急性髓系白血病的发病风险。     

亚甲基四氢叶酸还原酶基因多态性与急性淋巴细胞白血病患者甲氨蝶呤化疗毒副反应的研究

本研究旨在观察mthfr基因多态性分布对急性淋巴细胞白血病患者使用大剂量MTX化疗后毒副反应的影响。收集44例ALL患者外周血，提取基因组DNA，用PCR—RFLP技术检测mthfr基因型；观察经大剂量甲氨蝶呤化疗后所有患者的药后毒副作用。结果表明：mthfrC677T和A1298C各基因型间毒副反应差异显著，携带T突变基因患者发生毒副反应是携带CC基因型的3．75倍；携带AC＋CC基因型发生毒副反应是AA基因型携带者的0．12倍。mthfr677TT基因型联合1298AA基因型与677CC基因型同时携带1298C等位基因变异患者在毒副反应上差异显著，前者发生毒副作用的可能性是后者的16．5倍。结论：mthfr基因多态性分布与ALL患者HDMTX化疗后的毒副反应有关。     

中国甘肃人群髓过氧化物酶基因多态性与急性白血病易感性的关系

本研究旨在探讨甘肃汉族人群髓过氧化物酶（myeloperoxidase,MPO）基因多态性和急性白血病易感性的关系。用1∶1配对病例-对照方法及LDR-PCR方法,对100例急性白血病（AL）患者和100例非血液病、非肿瘤者作为对照进行mpo基因G463A突变分析。结果发现,AL病例组mpo基因a等位基因频率（19%）和ga/aa基因型频率（31%）均低于对照组（28%和54%）。携带ga/aa基因型的个体发生AL的相对风险度为其野生型（gg）的0.383倍（95%CI=0.215-0.682）。进一步分层分析显示,急性髓系白血病（AML）病例组ga/aa基因型频率（28.2%）低于对照组（54%）（p〈0.01）。携带ga/aa基因型的个体发生AML的相对风险度为其野生型（gg）的0.346倍（95%CI=0.157-0.546）。急性淋巴细胞白血病（ALL）病例组mpo基因a等位基因频率和ga/aa基因型频率均与对照组无统计学差异（p〉0.05）。结论：本研究人群mpo基因多态性与AML遗传易感性相关,等位基因a对AML易感性有保护作用,但与ALL易感性无关联。     

急性T淋巴细胞白血病中SIL-TAL1融合基因与6q缺失的相关性研究

本研究旨在探讨SIL-TAL1融合基因在急性T淋巴细胞白血病（T-ALL）患者中的表达情况,分析伴有SILTAL1阳性的T-ALL患者的临床和细胞遗传学特征。运用巢式逆转录聚合酶链反应检测68例T-ALL患者骨髓标本中的SIL-TAL1的表达,以R显带核型分析和微阵列比较基因组杂交检测核型异常。结果表明：在12例T-ALL患者中检测到SIL-TAL1融合基因的表达,儿童检出率明显高于成人（38.5%vs 4.8%,P=0.001）,其中50%（6/12）SIL-TAL1阳性患者存在两种转录本;SIL-TAL1阳性组核型异常率为54.5%（6/11）,其中4例伴有6号染色体长臂大片段缺失;2例经array-CGH检测到1p32存在约90 kb的缺失,形成SIL-TAL1融合基因;6号染色体长臂共同缺失区域为6q14.1-q16.3,均为杂合性缺失;SIL-TAL1阳性组中位白细胞计数和乳酸脱氢酶水平均高于阴性组（P〈0.05）。结论：SIL-TAL1融合基因与6q杂合性缺失有一定相关性（P=0.005）,在儿童中SIL-TAL1的检出率明显高于成人,且常伴有白细胞计数升高、乳酸脱氢酶升高等不良预后因素。     

CYP3A5基因多态性及其在急性白血病患者化疗与预后中的意义

为了探讨急性白血病（AL）患者细胞色素P-4503A5（CYP3A5）基因多态性和蛋白表达对患者发病、治疗疗效和预后的影响,采用聚合酶链反应-限制性片段长度多态性分析（PCR-RFLP）的方法检测患者骨髓原代细胞的CYP3A5＊3基因型,采用免疫组织化学方法检测CYP3A5在骨髓组织中的表达水平。结果表明：88例样本中野生型纯合子（CYP3A5＊1/＊1）23例（26%）,杂合子（CYP3A5＊1/＊3）44例（50%）,突变型纯合子（CYP3A5＊3/＊3）21例（24%）。CYP3A5＊3基因型频率为74%,符合中国健康人群分布;CYP3A5＊1基因型与耐药显著相关。按基因型分组后,3组的临床资料差异无统计学意义;CYP3A5蛋白表达检测结果分别为：（36.6±19.2）%、（7.8±9.2）%、（0.5±0.9）%;总生存率分别为（11.6±2.1）月、（30.5±12.2）月、（52.3±8.5）月;无病生存期分别为（7.5±1.8）月、（27±15.8）月、（52.3±8.1）月,差异均有统计学意义。结论：CYP3A5基因多态性与急性白血病患者发病无关,与CYP3A5蛋白的表达水平密切相关,而CYP3A5的表达高低与白血病患者的化疗疗效、预后密切相关。对初治AL患者的CYP3A5基因分型检测可以作为预测AL患者疗效和预后的指标。     

DNA修复基因XRCC1单核苷酸多态性与SLE的相关性

目的 分析中国汉族人群SLE患者与健康对照人群中DNA修复基因X线修复交叉互补基因1(XRCC1)的单核苷酸多态性(SNP)分布,探讨其对SLE易感性的影响及与临床表现、实验室指标的关联程度。 方法 用等位基因特异性PCR(AS-PCR)检测39例中国汉族SLE患者和40例中国汉族健康人的XRCC1基因多态位点Arg194Trp、Arg280His和Arg399G1n的SNP型别。 结果 SLE组XRCC1多态位点Arg399G1n等位基因和基因型频率分布与健康人对照组比较具有显著性差异(P<0.05)。XRCC1多态位点Arg194Trp与SLE患者的血液系统损害及抗SS-A抗体的存在相关(P<0.05)。 结论 XRCC1基因SNP与SLE发生及临床表现和自身抗体可能相关。