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HLA-B27基因在云南傣族健康人群和云南汉族白血病的研究
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摘要
目的:①运用序列特异性引物聚合酶链反应(polymerase chain reaction-sequence specific primers,PCR-SSP)扩增方法检测HLA-B27基因在云南西双版纳傣族健康人群中的分布,以了解HLA-B27基因在云南西双版纳傣族人群中的分布特征,并为种族遗传学提供重要的参考资料。
     ②运用序列特异性引物聚合酶链反应(polymerase chain reaction-sequencespecific primers,PCR-SSP)扩增方法检测HLA-B27基因与云南汉族白血病患者的关联性,为白血病的发病机制提供一些遗传学参考依据,并为下一步进行HLA与云南不同民族白血病的相关性研究提供基础数据。
     方法:①根据“知情同意”的原则,在云南西双版纳傣族自治州景洪市傣族人群聚居地,选择3代以上相互之间无亲缘关系,均为本民族的健康个体61例。本研究首先合成扩增HLA-B基因的引物一对,扩增HLA-B27基因的引物两对,然后建立PCR-SSP方法。从EDTA抗凝的外周血提取基因组DNA,然后对HLA-B27基因进行PCR扩增。运用四格表X~2检验分析HLA-B27基因在云南傣族健康人群和云南汉族、纳西族、傈僳族、怒族、彝族、中国南、北方汉族及泰国健康人群中的分布差异。
     ②随机收集2007年5月-11月在昆明医学院第二附属医院血液科住院,确诊为白血病的患者26例作为病人组,健康对照组选取62例来自云南昆明汉族无血缘关系的健康者。本研究首先合成扩增HLA-B基因的引物一对,扩增HLA-B27基因的引物两对,然后建立PCR-SSP方法。从EDTA抗凝的外周血提取基因组DNA,然后对HLA-B27基因进行PCR扩增。按照病例-对照研究分析方法,分析HLA-B27基因在白血病组与健康对照组阳性率的差异及HLA-B27基因与疾病的相关性。
     结果:①在关于61例云南傣族健康人群的HLA-B27基因研究中,14例为阳性,占22.9%,明显高于云南汉族(4.8%)、纳西族(0.6%)、傈僳族(0.9%)、彝族(4.2%)、怒族(0),亦明显高于中国南方汉族(4.3%)、北方汉族(4.29%)、泰国人群(10%),经四格表X~2检验分析,HLA-B27基因在云南傣族健康人群与云南汉族、纳西族、傈僳族、怒族、彝族、中国南、北方汉族及泰国人群中基因阳性率具有显著性差异。
     ②在关于26例云南汉族白血病患者的HLA-B27基因研究中,发现1例为阳性,占3.8%。在62例云南汉族健康人群中,有3例为阳性,占4.8%。按照病例-对照研究分析方法,经四格表X~2检验分析,无统计学差异。
     结论:①在云南傣族健康人群的HLA-B27基因研究中,发现HLA-B27基因在云南傣族健康人群中的分布明显高于云南汉族、纳西族、傈僳族、怒族、彝族,亦明显高于中国南、北方汉族及泰国人群。本研究结果表明,西双版纳傣族是一个与汉族群体及其他群体不同的、具有HLA-B27基因高频率的群体。可能是由于不同区域、不同种族及人群HLA分布本身就存在很大的差异,也可能是由于不同人群的生存环境、生活习惯及实验方法不同等因素的影响,造成HLA-B27基因阳性率分布的不均衡,因此需要尽可能的排除影响因素,并进一步收集样本减少误差。
     ②在本组云南汉族白血病与HLA-B27基因的关联性研究中,没有发现HLA-B27基因与云南汉族白血病具有相关性,也没有发现HLA-B27基因在本组白血病患者与正常健康人中的分布有差异性,这可能与白血病的复杂的发病机制,分类较多及人群地理分布及样本量有关。需要进一步收集大量样本,对不同民族、不同类型的白血病进行与HLA关联性的研究。
Objective:①To understand the distribution of HLA-B27 gene in healthy population from Yunnan Dai Ethnic Group,by polymerase chain reaction-sequence specific primers(PCR-SSP),HLA-B27 gene was amplified from the healthy Dai inhabiting in Xishuangbanna Autonomous Prefecture in Yunnan Province,that will provide important references for racial genetics.
     ②Using polymerase chain reaction-sequence specific primers to amplify HLA-B27 gene in patients with leukemia in Yunnan Han people and study the association of HLA-B27 gene with these patients,that provide some reference in genetics for the pathogenesis of leukemia and provide the basic data for the relevance of HLA to different ethnic groups with leukemia in Yunnan for study of the next step.
     Methods:①A total of 61 healthy unrelated individuals from Dai ethnic groups lived in Xishuangbanna Autonomous Prefecture in yunnan province of southwestern China were enrolled in this study.The peripheral blood was collected after informed consents were obtained,and then the HLA-B27 gene was amplified by PCR -SSP.Using four-frame Table X~2 examination to analysis differences of HLA-B27 gene frequencies in healthy unrelated individuals from Yunnan Dai and Han、Naxi、Lisu、Nu、Yi、the South Han、the North Han in China and Thai people in Thailand.②26 patients with leukemia were diagnosised in the second hospital of Kunming Medical College,between in May 2007 and November 2007,who were selected randomly from the department of Hematology.62 Yunnan Han Who lived in Yunnan province of southwestern China were enrolled as the control.After extrating the genomic DNA from peripheral blood anticoagulanted by EDTA and then the HLA-27 gene was amplified by PCR-SSP.According to case-control study analysis,we analysised the difference of HLA-B27 gene frequencies between in the healthy control group and the Leukemia Group and studied the association of HLA-B27 gene with patients with leukemia.
     Result:①61 cases in Yunnan Dai healthy population for HLA-B27 gene,14 cases were positive,accounting for 22.9%,significantly higher than that of Yunnan Han(4.8%)、Naxi(0.6%)、Lisu(0.9%)、Nu(0%)、Yi(4.2%),China Southern Han(4.3%)、the North Han(4.29%)and Thai people(10%).Using the four-frame table X~2 test, studied the distribution of HLA-B27 gene frequencies among Yunnan Dai、Han、Naxi、Lisu、Nu、Yi、Southern Han、North Han in China and Thai people.There are significantly different to frequencies of HLA-B27 gene among these people.
     ②In 26 cases of patients with leukemia in Yunnan about HLA-B27gene research, we found one cases is positive,for 3.8 percent,and in 62 cases Han people,three cases is positive,accounting for 4.8%.According to case-control study on the analysis method,there was no statistically different between the patients with leukemia and the control subject.
     Conclusion:①In the study about,we found that frequence of HLA-B27 gene in healthy people from Yunnan Dai ethnic group was significantly higher than that of the Han、Naxi、Lisu、Nu、Yi、and also significantly higher than Southern Han、the North Han in China and Thai people in Thailand.The results of this study show that, Xishuangbanna Dai Han is a different group with a high frequency of HLA-B27 gene comparing with other groups.May be due to different regions,different ethnic groups and the distribution of HLA itself that there is a big difference,or be due to living environment where different groups of people lived,living habits of different groups of people and the different experimental methods,and so on,that result in the distribution of HLA-B27 gene frequency uneven.Hence need to exclude affecting factors as much as possible and need to collect a larger sample and go to further reduce the error.
     ②In the study of this group to the relevance of HLA-B27 gene and the patients with leukemia in Yunnan Han,we didn't find that there were the relevance of HLA-B27 gene and the patients with leukemia,and also didn't find that there were difference between in the patients with leukemia and in healthy people to the distribution of HLA-B27 gene frequencies.This may be related to the incidence of leukemia with complicated mechanism,more classification and geographical distribution of the samples,sample size,and so on.Need to collect large numbers of samples and study association of different types of leukemia from different nationalities with HLA.
引文
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