目的探讨宫颈癌染色体3p14区域D3S1300、D3S1600位点微卫星不稳定性(microsatellite instability,MSl)及等位基因杂合性缺失(loss of heterozygosity,LOH)频率,为准确定位宫颈癌相关肿瘤抑制基因位点提供实验依据,并探讨LOH及MSI与宫颈...目的探讨宫颈癌染色体3p14区域D3S1300、D3S1600位点微卫星不稳定性(microsatellite instability,MSl)及等位基因杂合性缺失(loss of heterozygosity,LOH)频率,为准确定位宫颈癌相关肿瘤抑制基因位点提供实验依据,并探讨LOH及MSI与宫颈癌临床分期、病理分级的相关性。方法选择3p14区域两个微卫星多态性位点,显微分离提取41例宫颈癌石蜡切片中的正常组织和肿瘤组织,经PCR扩增及聚丙烯酰胺凝胶电泳和硝酸银染色,进行LOH及MSI研究。结果41例样本中有25例至少存在一个位点的LOH,D3S1300位点LOH的频率为35%,D3S1600位点LOH的频率为28%。MSI发生频率相对较低,D3S1300的MSI频率为7.5%,D3S1600的MSI频率为12.8%。D3S1300、D3S1600位点LOH的发生率与临床分期、病理分级相关性有显著意义(P<0.05),而MSI与之无显著的差别(P>0.05)。结论3p14区域内D3S1300、D3S1600位点具有较高的LOH,提示这两个微卫星位点附近可能存在尚未克隆的与宫颈癌发生、发展相关的肿瘤抑制基因。宫颈癌染色体3p14区域LOH与临床分期、病理分级成正相关,提示检测该区域的LOH可作为病程进展及预后的重要参考指标。MSI在本研究中与宫颈癌临床分期、病理分级无明显相关。展开更多
Herpesviruses account for most of the known virus-encoded miRNAs. Herpesvirus of turkey (HVT), a non-pathogenic avian herpesvirus used as an avian vaccine and viral vector, encodes 28 mature miRNAs. This included HVT-...Herpesviruses account for most of the known virus-encoded miRNAs. Herpesvirus of turkey (HVT), a non-pathogenic avian herpesvirus used as an avian vaccine and viral vector, encodes 28 mature miRNAs. This included HVT-miR-H14-3p that showed almost identical sequence to gga-miR-221, suggesting that it is pirated from the avian host. Although the functional homolog between the two miRNAs has been proposed based on the sequence similarity, the direct experimental evidence is still lacking. In this report, we provide the evidence for the first time that HVT-miR-H14-3p is indeed a gga-miR-221 homolog through modulating the expression of p27Kip1, a known target of miR-221 by binding to its 3’UTR. We also created an HVT-miR-H14-3p deletion virus and show that this miRNA is not essential for in vitro replication.展开更多
文摘目的探讨宫颈癌染色体3p14区域D3S1300、D3S1600位点微卫星不稳定性(microsatellite instability,MSl)及等位基因杂合性缺失(loss of heterozygosity,LOH)频率,为准确定位宫颈癌相关肿瘤抑制基因位点提供实验依据,并探讨LOH及MSI与宫颈癌临床分期、病理分级的相关性。方法选择3p14区域两个微卫星多态性位点,显微分离提取41例宫颈癌石蜡切片中的正常组织和肿瘤组织,经PCR扩增及聚丙烯酰胺凝胶电泳和硝酸银染色,进行LOH及MSI研究。结果41例样本中有25例至少存在一个位点的LOH,D3S1300位点LOH的频率为35%,D3S1600位点LOH的频率为28%。MSI发生频率相对较低,D3S1300的MSI频率为7.5%,D3S1600的MSI频率为12.8%。D3S1300、D3S1600位点LOH的发生率与临床分期、病理分级相关性有显著意义(P<0.05),而MSI与之无显著的差别(P>0.05)。结论3p14区域内D3S1300、D3S1600位点具有较高的LOH,提示这两个微卫星位点附近可能存在尚未克隆的与宫颈癌发生、发展相关的肿瘤抑制基因。宫颈癌染色体3p14区域LOH与临床分期、病理分级成正相关,提示检测该区域的LOH可作为病程进展及预后的重要参考指标。MSI在本研究中与宫颈癌临床分期、病理分级无明显相关。
文摘Herpesviruses account for most of the known virus-encoded miRNAs. Herpesvirus of turkey (HVT), a non-pathogenic avian herpesvirus used as an avian vaccine and viral vector, encodes 28 mature miRNAs. This included HVT-miR-H14-3p that showed almost identical sequence to gga-miR-221, suggesting that it is pirated from the avian host. Although the functional homolog between the two miRNAs has been proposed based on the sequence similarity, the direct experimental evidence is still lacking. In this report, we provide the evidence for the first time that HVT-miR-H14-3p is indeed a gga-miR-221 homolog through modulating the expression of p27Kip1, a known target of miR-221 by binding to its 3’UTR. We also created an HVT-miR-H14-3p deletion virus and show that this miRNA is not essential for in vitro replication.
