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作 者:邓建华[1] 李汉忠[1] 纪志刚[1] 徐维锋[1] 张玉石[1] 谢燚[1]
机构地区:[1]中国医学科学院北京协和医学院北京协和医院泌尿外科,100730
出 处:《中华泌尿外科杂志》2014年第8期616-620,共5页Chinese Journal of Urology
摘 要:目的 检测家族性嗜铬细胞瘤/副神经节瘤(PHEO/PGL)中编码琥珀酸脱氢酶(succinate dehydrogenase,SDH)复合体亚单位的核基因以及RET、VHL基因突变和SDHB的DNA甲基化程度,探讨家族性PHEO/PGL基因突变和DNA甲基化与其发病机制的关系.方法 对2008年10月至2011年4月97例PHEO/PGL患者进行了SDHB、SDHC、SDHD、SDHAF2、VHL和RET等胚系突变基因的分析.对SDHB基因(1q36.1~1q35,外显子1~8),SDHC基因(1q21,外显子1~5),SDHD基因(11q23,外显子1~4),SDHAF2基因(11q12.2,外显子1~4),RET原癌基因(10q11.2,外显子10、11、13、14及15、16)和VHL基因 (3p25.3,外显子1~3)等进行DNA序列分析.同时检测PHEO/PGL患者外周血样本SDHB启动子区的甲基化程度,与临床特点包括年龄、肿瘤直径、多发病变和内分泌检查等结果行相关分析.结果 97例患者中基因突变17例(17.5%),其中SDHB基因突变7例(7.2%),均位于腹膜后,恶变者4例;RET原癌基因突变8例(8.2%);VHL基因突变2例(2.1%).检测到7例PHEO/ PGL的外周血样本SDHB启动子区的DNA甲基化,有或无甲基化两组的良/恶性、单/多发和肿瘤直径比较差异有统计学意义(P<0.01).结论 SDHB突变多见于腹膜后的PGL和恶变的PGL; SDHB基因DNA甲基化程度较高,可能是其恶变的机制之一.推荐对PHEO/PGL患者进行基因筛查.Objective To detect the genetic mutations of succinate dehydrogenase B (SDHB),SDHC,SDHD,SDHAF2 and RET,VHL in hereditary pheochromocytoma (PHEO) paraganglioma (PGL) syndrome in order to analyze the relationship between the pathogenesis and SDHx mutations and DNA methylation.Methods SDH genes,VHL and RET were analyzed for germline mutations in 97 PHEOs/PGLs patients.Correlations were analyzed between the results and the clinical characteristics including age,tumor localization,multifocality,24 h urine CA,IGF and NSE.Direct DNA sequence analysis was carried out for SDHB (1q36.1-1q35,exons1-8),SDHC (1q21,exons 1-5),SDHD (11q23,exons 1-4),SDHAF2 (11q12.2,exons 1-4),RET (10q11.2,exons10,11,13,14&15,and 16) and VHL (3p25.3,exons 1-3) genes,and promoter region methylation of SDHB was detected in PHEO/PGL peripheral blood samples.Results Germinal mutations were found in 17 patients (17.5%),with 8 cases in RET proto-oncogene (8.2%),7 cases in SDHB genes (7.2%) and 2 cases in VHL gene (2.1%).The comparison of some of the clinical features in two groups (with and without promoter region methylation of SDHB) showed significant differences (P<0.01).Conclusions Genetic predisposition is frequent in chromaffin tissue tumors,indicating that DNA analysis is necessary.The mutation of SDHB is highly associated with abdominal PGL and the following distant metastasis (malignant PGL).
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