OBJECTIVE To investigate homozygous deletions and mutations in the CDKN2A gene(p16 INK4a and p14 ARF gene)in hydatidiform moles. METHODS A total of 38 hydatidiform mole samples and 30 villi samples were examined for h...OBJECTIVE To investigate homozygous deletions and mutations in the CDKN2A gene(p16 INK4a and p14 ARF gene)in hydatidiform moles. METHODS A total of 38 hydatidiform mole samples and 30 villi samples were examined for homozygous deletions in the CDKN2A gene by PCR and for mutations by DHPLC. RESULTS i)Among 38 hydatidiform mole samples, homozygous deletions in the p16 INK4a exon 1 were identified in 5 cases(13.2%),while no homozygous deletions were found in the p16I NK4aexon 1 of 30 early-pregnancy samples.The rates of those deletions in hydatidiform compared to early-pregnancy villi samples was statistically significant(P=0.036).ii)No homozygous deletions in the p14 ARF exon 1 or p16 INK4a exon 2 were found in any of the hydatidiform moles or early-preganancy samples.iii) In all hydatidiform moles and early-pregnancy villi samples,no mutations were detected by DHPLC. CONCLUSION We suggest there may be a close correlation between homozygous deletions in the CDKN2A gene and occurrence of hydatidiform moles variation in the CDKN2A gene is mainly caused by homozygous deletions,while mutations may be not a major cause.展开更多
The case of a young female patient with metachronous primary melanomas, advanced breast and pancreatic cancers is reported. The 5 different tumors diagnosed within six years, were managed with curative intent. Genetic...The case of a young female patient with metachronous primary melanomas, advanced breast and pancreatic cancers is reported. The 5 different tumors diagnosed within six years, were managed with curative intent. Genetic analysis revealed the mutation of the R24P CDKN2A gene in a heterozygote form in both the patient and her father. Careful tertiary prevention during the follow-up of the patient is needed.展开更多
目的探讨细胞周期蛋白依赖激酶抑制剂2A(CDKN2A)在人非小细胞肺癌(NSCLC)中表达、生物学功能和患者预后的关系。方法应用生物信息分析技术探讨癌症基因组图谱数据库(TCGA)中CDKN2A在NSCLC患者肿瘤组织和正常肺组织中的表达情况。采用蛋...目的探讨细胞周期蛋白依赖激酶抑制剂2A(CDKN2A)在人非小细胞肺癌(NSCLC)中表达、生物学功能和患者预后的关系。方法应用生物信息分析技术探讨癌症基因组图谱数据库(TCGA)中CDKN2A在NSCLC患者肿瘤组织和正常肺组织中的表达情况。采用蛋白-蛋白相互作用(PPI)数据库STRING分析CDKN2A编码蛋白作用网络,并进行聚类分析。采用基因本体论(Gene Ontology,GO)和京都基因与基因组百科全书(Kyoto Encyclopedia of Genes and Genomes,KEEG)富集CDKN2A和相关蛋白的生物学功能和信号通路。同时分析CDKN2A高低表达与NSCLC患者的无疾病进展生存和总生存的关系。同时采用免疫组化检测62例NSCLC患者癌组织和癌旁组织中CDKN2A表达情况分析CDKN2A阳性和阴性表达组患者生存期是否存在差异。结果CDKN2A基因在多种实体肿瘤包括乳腺癌、食管癌、肠癌等中表达水平明显上调。在NSCLC患者癌组织中CDKN2A表达水平明显高于正常肺组织(P<0.05)。而CDKN2A表达水平与肿瘤分期无明显相关性(P>0.05)。CDKN2A相关蛋白PPI网络中,相互作用关系指数为24.8,区域聚类指数为0.74,相互作用蛋白呈现明显的聚类表达(P<0.05)。CDKN2A编码蛋白主要定位在细胞核、细胞膜和囊泡;分子功能主要为蛋白结合、核蛋白结合和铁结合。而生物学过程主要集中于代谢、细胞增殖及对刺激的反应。KEGG信号通路主要为细胞周期调控、DNA蛋白结合以及Wnt信号通路。CDKN2A高表达NSCLC患者总生存期明显低于低表达组,且差异有统计学意义(HR=1.3,P=0.02),而CDKN2A高低表达组间NSCLC患者无疾病进展生存无统计学差异(HR=0.94,P=0.59)。62例NSCLC患者癌组织中CDKN2A阳性表达11例(17.7)而对应癌旁组织中阳性表达49例(79.0%),癌组织中CDKN2A阳性标的率显著高于癌旁组织(P<0.05)。而CDKN2A阳性组与阴性组患者生存期差异无统计学意义(HR=0.99,P>0.05)。结论CDKN2A在NSCLC患者癌组织中表达升高,并与患者预后不良有关,有望成为NSCLC预后和治疗的靶点。展开更多
基金This work was supported by a grant from the National Natural Science Foundation of China(No.30772321)
文摘OBJECTIVE To investigate homozygous deletions and mutations in the CDKN2A gene(p16 INK4a and p14 ARF gene)in hydatidiform moles. METHODS A total of 38 hydatidiform mole samples and 30 villi samples were examined for homozygous deletions in the CDKN2A gene by PCR and for mutations by DHPLC. RESULTS i)Among 38 hydatidiform mole samples, homozygous deletions in the p16 INK4a exon 1 were identified in 5 cases(13.2%),while no homozygous deletions were found in the p16I NK4aexon 1 of 30 early-pregnancy samples.The rates of those deletions in hydatidiform compared to early-pregnancy villi samples was statistically significant(P=0.036).ii)No homozygous deletions in the p14 ARF exon 1 or p16 INK4a exon 2 were found in any of the hydatidiform moles or early-preganancy samples.iii) In all hydatidiform moles and early-pregnancy villi samples,no mutations were detected by DHPLC. CONCLUSION We suggest there may be a close correlation between homozygous deletions in the CDKN2A gene and occurrence of hydatidiform moles variation in the CDKN2A gene is mainly caused by homozygous deletions,while mutations may be not a major cause.
文摘The case of a young female patient with metachronous primary melanomas, advanced breast and pancreatic cancers is reported. The 5 different tumors diagnosed within six years, were managed with curative intent. Genetic analysis revealed the mutation of the R24P CDKN2A gene in a heterozygote form in both the patient and her father. Careful tertiary prevention during the follow-up of the patient is needed.
文摘目的探讨细胞周期蛋白依赖激酶抑制剂2A(CDKN2A)在人非小细胞肺癌(NSCLC)中表达、生物学功能和患者预后的关系。方法应用生物信息分析技术探讨癌症基因组图谱数据库(TCGA)中CDKN2A在NSCLC患者肿瘤组织和正常肺组织中的表达情况。采用蛋白-蛋白相互作用(PPI)数据库STRING分析CDKN2A编码蛋白作用网络,并进行聚类分析。采用基因本体论(Gene Ontology,GO)和京都基因与基因组百科全书(Kyoto Encyclopedia of Genes and Genomes,KEEG)富集CDKN2A和相关蛋白的生物学功能和信号通路。同时分析CDKN2A高低表达与NSCLC患者的无疾病进展生存和总生存的关系。同时采用免疫组化检测62例NSCLC患者癌组织和癌旁组织中CDKN2A表达情况分析CDKN2A阳性和阴性表达组患者生存期是否存在差异。结果CDKN2A基因在多种实体肿瘤包括乳腺癌、食管癌、肠癌等中表达水平明显上调。在NSCLC患者癌组织中CDKN2A表达水平明显高于正常肺组织(P<0.05)。而CDKN2A表达水平与肿瘤分期无明显相关性(P>0.05)。CDKN2A相关蛋白PPI网络中,相互作用关系指数为24.8,区域聚类指数为0.74,相互作用蛋白呈现明显的聚类表达(P<0.05)。CDKN2A编码蛋白主要定位在细胞核、细胞膜和囊泡;分子功能主要为蛋白结合、核蛋白结合和铁结合。而生物学过程主要集中于代谢、细胞增殖及对刺激的反应。KEGG信号通路主要为细胞周期调控、DNA蛋白结合以及Wnt信号通路。CDKN2A高表达NSCLC患者总生存期明显低于低表达组,且差异有统计学意义(HR=1.3,P=0.02),而CDKN2A高低表达组间NSCLC患者无疾病进展生存无统计学差异(HR=0.94,P=0.59)。62例NSCLC患者癌组织中CDKN2A阳性表达11例(17.7)而对应癌旁组织中阳性表达49例(79.0%),癌组织中CDKN2A阳性标的率显著高于癌旁组织(P<0.05)。而CDKN2A阳性组与阴性组患者生存期差异无统计学意义(HR=0.99,P>0.05)。结论CDKN2A在NSCLC患者癌组织中表达升高,并与患者预后不良有关,有望成为NSCLC预后和治疗的靶点。
