HMG proteins are abundant chromosomal non-histone proteins. It has been suggested that the HMG proteins may play an important role in the structure and function of chromatin. In the present study, the binding of HMG p...HMG proteins are abundant chromosomal non-histone proteins. It has been suggested that the HMG proteins may play an important role in the structure and function of chromatin. In the present study, the binding of HMG proteins (HMG1/2 and HMG14/17) to the core DNA sequence of DNasel hypersensitive site 2 (HS2core DNA sequence, -10681-10970 bp) in the locus control region (LCR) of the human β-like globin gene cluster has been examined by using both the in vitro nucleosome reconstitution and the gel mobility shift assays. Here we show that HMG1/2 can bind to the naked HS2core DNA sequence, however, HMG 14/17 cannot. Using the in vitro nucleosome reconstitution we demonstrate that HMG14/17 can bind to the HS2core DNA sequence which is assembled into nucleosomes with the core histone octamer transferred from chicken erythrocytes. In contrast, HMG 1/2 cannot bind to the nucleosomes reconstituted in vitro with the HS2core DNA sequence. These results indicate that the binding patterns between HMG proteins and the HS2core DNA sequence which exists in different states (the naked DNA or the in vitro reconstituted nucleosomal DNA) are quite different. We speculate that HMG proteins might play a critical role in the regulation of the human β-like globin gene's expression.展开更多
采用DNase Ⅰ超敏感性分析和限制性内切酶介导的原位切口平移技术(Restriction Enzyme Nick Translation,RE-NT)对黄鳝二价体基因组结构进行了分析研究。已知DNaseⅠ超敏感性与潜在活性基因分布密切相关。结果表明,经DNaseⅠ介导的原位...采用DNase Ⅰ超敏感性分析和限制性内切酶介导的原位切口平移技术(Restriction Enzyme Nick Translation,RE-NT)对黄鳝二价体基因组结构进行了分析研究。已知DNaseⅠ超敏感性与潜在活性基因分布密切相关。结果表明,经DNaseⅠ介导的原位切口平移处理,在黄鳍二价体上可展现类D带带型,而由限制性内切酶介导的原位切口平移结果显示,AluⅠ和MspⅠ均在黄鳝二价体上诱导产生类G带带型,HpaⅡ和HaeⅢ则优先切割5号二价体上一特定区域,诱导出一段由标记信号所构成的类C带,对上述结果进行了分析和讨论。展开更多
目的探讨脱氧核糖核酸酶1类似物3(deoxyribonuclease 1 like 3,DNASE1L3)基因表达与肝癌临床病理特征及预后的相关性。方法收集NCBI(National Center for Biotechnology Information)GEO(Gene Expression Omnibus)公共数据库的225份肝...目的探讨脱氧核糖核酸酶1类似物3(deoxyribonuclease 1 like 3,DNASE1L3)基因表达与肝癌临床病理特征及预后的相关性。方法收集NCBI(National Center for Biotechnology Information)GEO(Gene Expression Omnibus)公共数据库的225份肝癌组织样本基因表达谱数据集,将探针信号强度以2为底的对数值作为DNASE1L3的相对表达量,≥5为高表达组,<5为低表达组。对样本的基因表达谱数据及对应的患者临床数据进行病理指标的回顾性分析和预后情况分析;通过基因集富集方法分析DNASE1L3表达相关的肿瘤基因集。结果与DNASE1L3高表达组比较,低表达组样本中甲胎蛋白(AFP)含量较高(P=0.001),肿瘤体积较大(P=0.009),美国癌症联合委员会(AJCC)和国际抗癌联盟(UICC)共同建立的肿瘤分期体系(TNM)分期(P<0.001)、巴塞罗那临床肝癌评分系统(BCLC)分期(P=0.043)、意大利肝癌小组评分体系(CLIP)分期(P=0.010)均较差,且更易发生转移(P<0.001);DNASE1L3低表达组患者的预后明显差于高表达组(P=0.007,HR:1.807,95%CI:1.175~2.779);DNASE1L3低表达组可富集到组蛋白结合、微管运动、组蛋白激酶活性等多个肿瘤相关基因集,但高表达组未富集到肿瘤相关基因集。结论 DNASE1L3基因表达与肝癌临床病理特征及预后相关,其低表达是肝癌的危险因素之一。展开更多
文摘HMG proteins are abundant chromosomal non-histone proteins. It has been suggested that the HMG proteins may play an important role in the structure and function of chromatin. In the present study, the binding of HMG proteins (HMG1/2 and HMG14/17) to the core DNA sequence of DNasel hypersensitive site 2 (HS2core DNA sequence, -10681-10970 bp) in the locus control region (LCR) of the human β-like globin gene cluster has been examined by using both the in vitro nucleosome reconstitution and the gel mobility shift assays. Here we show that HMG1/2 can bind to the naked HS2core DNA sequence, however, HMG 14/17 cannot. Using the in vitro nucleosome reconstitution we demonstrate that HMG14/17 can bind to the HS2core DNA sequence which is assembled into nucleosomes with the core histone octamer transferred from chicken erythrocytes. In contrast, HMG 1/2 cannot bind to the nucleosomes reconstituted in vitro with the HS2core DNA sequence. These results indicate that the binding patterns between HMG proteins and the HS2core DNA sequence which exists in different states (the naked DNA or the in vitro reconstituted nucleosomal DNA) are quite different. We speculate that HMG proteins might play a critical role in the regulation of the human β-like globin gene's expression.
文摘采用DNase Ⅰ超敏感性分析和限制性内切酶介导的原位切口平移技术(Restriction Enzyme Nick Translation,RE-NT)对黄鳝二价体基因组结构进行了分析研究。已知DNaseⅠ超敏感性与潜在活性基因分布密切相关。结果表明,经DNaseⅠ介导的原位切口平移处理,在黄鳍二价体上可展现类D带带型,而由限制性内切酶介导的原位切口平移结果显示,AluⅠ和MspⅠ均在黄鳝二价体上诱导产生类G带带型,HpaⅡ和HaeⅢ则优先切割5号二价体上一特定区域,诱导出一段由标记信号所构成的类C带,对上述结果进行了分析和讨论。
文摘目的探讨脱氧核糖核酸酶1类似物3(deoxyribonuclease 1 like 3,DNASE1L3)基因表达与肝癌临床病理特征及预后的相关性。方法收集NCBI(National Center for Biotechnology Information)GEO(Gene Expression Omnibus)公共数据库的225份肝癌组织样本基因表达谱数据集,将探针信号强度以2为底的对数值作为DNASE1L3的相对表达量,≥5为高表达组,<5为低表达组。对样本的基因表达谱数据及对应的患者临床数据进行病理指标的回顾性分析和预后情况分析;通过基因集富集方法分析DNASE1L3表达相关的肿瘤基因集。结果与DNASE1L3高表达组比较,低表达组样本中甲胎蛋白(AFP)含量较高(P=0.001),肿瘤体积较大(P=0.009),美国癌症联合委员会(AJCC)和国际抗癌联盟(UICC)共同建立的肿瘤分期体系(TNM)分期(P<0.001)、巴塞罗那临床肝癌评分系统(BCLC)分期(P=0.043)、意大利肝癌小组评分体系(CLIP)分期(P=0.010)均较差,且更易发生转移(P<0.001);DNASE1L3低表达组患者的预后明显差于高表达组(P=0.007,HR:1.807,95%CI:1.175~2.779);DNASE1L3低表达组可富集到组蛋白结合、微管运动、组蛋白激酶活性等多个肿瘤相关基因集,但高表达组未富集到肿瘤相关基因集。结论 DNASE1L3基因表达与肝癌临床病理特征及预后相关,其低表达是肝癌的危险因素之一。
