从2001年WHO/IUATLD全球抗结核药物耐药监测之内蒙古耐药监测结核菌1 114株中,选取经比例法药敏结果得到的耐多药(MDR)结核菌188株,利用Geno Type MTBDRplus方法检测该批菌株的RIF、INH耐药情况及其耐药基因突变形式。最终得到MDR菌株10...从2001年WHO/IUATLD全球抗结核药物耐药监测之内蒙古耐药监测结核菌1 114株中,选取经比例法药敏结果得到的耐多药(MDR)结核菌188株,利用Geno Type MTBDRplus方法检测该批菌株的RIF、INH耐药情况及其耐药基因突变形式。最终得到MDR菌株103(54.79%)株,单耐RIF菌株52(27.66%)株,单耐INH菌株10(5.32%)株,全敏感菌株20株,TUB条带缺失1株,kat G质控带缺失2株。RIF耐药菌株检测的是rpo B基因区,该基因突变菌株有155株;rpo B S531L突变菌株为49.68%(77/155)。INH耐药菌株检测的是kat G基因区和inh A基因启动子区,共113株,其中kat G基因突变菌株占79.65%(90/113),主要是S3-15T1突变;inh A基因突变菌株占22.12%(25/113)。因此,Geno Type MTBDRplus可用于内蒙古地区MDR结核菌的快速检测。其中rpo BS531L突变形式在RIF耐药菌株中最常见;在INH耐药菌株中,kat G基因突变较inh A基因突变常见,S315T1突变是INH耐药菌中常见的突变形式。展开更多
Chronic active hepatitis(CAH) is acknowledged as an imperative risk factor for the development of liver injury and hepatocellular carcinoma.The histological end points of CAH are chronic inflammation,fibrosis and cirr...Chronic active hepatitis(CAH) is acknowledged as an imperative risk factor for the development of liver injury and hepatocellular carcinoma.The histological end points of CAH are chronic inflammation,fibrosis and cirrhosis which are coupled with increased DNA synthesis in cirrhotic vs healthy normal livers.The potential mechanism involved in CAH includes a combination of processes leading to liver cell necrosis,inflammation and cytokine production and liver scaring(fibrosis).The severity of liver damage is regulated by Hepatitis B virus genotypes and viral components.The viral and cellular factors that contribute to liver injury are discussed in this article.Liver injury caused by the viral infection affects many cellular processes such as cell signaling,apoptosis,transcription,DNA repair which in turn induce radical effects on cell survival,growth,transformation and maintenance.The consequence of such perturbations is resulted in the alteration of bile secretion,gluconeogenesis,glycolysis,detoxification and metabolism of carbohydrates,proteins,fat and balance of nutrients.The identification and elucidation of the molecular pathways perturbed by the viral proteins are important in order to design effective strategy to minimize and/or restore the hepatocytes injury.展开更多
目的用生物信息学分析新基因TSC21并进行蛋白表达及纯化。方法将不同发育阶段的小鼠睾丸组织cDNA探针与Affymetrix全基因组芯片进行杂交并筛选出差异表达的基因。用生物学信息软件对该基因进行生物学信息分析。运用RT-PCR分析该基因小...目的用生物信息学分析新基因TSC21并进行蛋白表达及纯化。方法将不同发育阶段的小鼠睾丸组织cDNA探针与Affymetrix全基因组芯片进行杂交并筛选出差异表达的基因。用生物学信息软件对该基因进行生物学信息分析。运用RT-PCR分析该基因小鼠不同组织及人不同组织中的表达。对人的TSC21基因进行cDNA克隆、蛋白表达及纯化。结果通过不同日龄小鼠睾丸的芯片信号比较筛选出一个差异表达基因(GenBank登录号:NM-028825),全长有810bp,含有543bp的完整ORF,编码一个有180个氨基酸、分子量为21.040kDa的蛋白质,我们将其命名为TSC21。亚细胞定位预测显示TSC21基因可能在细胞核中表达。基因功能域预测表明在氨基酸34-40处有CK1和CK2磷酸化位点,在氨基酸100-106处有PKA(cAMP-dependent protein kinase A)磷酸化位点。RT-PCR分析表明TSC21基因特异性表达于小鼠睾丸组织。TSC21蛋白在人的同源基因GenBank登录号为NM-152670,在180个氨基酸区域内有82%的同源性,人TSC21(hTSC21)基因特异性地表达于人睾丸组织中。成功构建PET-28a2c(+)vector/hTSC21表达载体,并转化BL21,以IPTG诱导蛋白表达,对诱导剂浓度、诱导时间进行优化后以镍离子亲和层析纯化目的蛋白。结论TSC21基因在小鼠及人的睾丸组织中特异性表达并具有高度同源性,显示其可能在精子发生中起着重要作用。所得人TSC21蛋白可进行其蛋白结构活性、睾丸组织中的定位分布及在男性不育等疾病检测的研究。展开更多
文摘Chronic active hepatitis(CAH) is acknowledged as an imperative risk factor for the development of liver injury and hepatocellular carcinoma.The histological end points of CAH are chronic inflammation,fibrosis and cirrhosis which are coupled with increased DNA synthesis in cirrhotic vs healthy normal livers.The potential mechanism involved in CAH includes a combination of processes leading to liver cell necrosis,inflammation and cytokine production and liver scaring(fibrosis).The severity of liver damage is regulated by Hepatitis B virus genotypes and viral components.The viral and cellular factors that contribute to liver injury are discussed in this article.Liver injury caused by the viral infection affects many cellular processes such as cell signaling,apoptosis,transcription,DNA repair which in turn induce radical effects on cell survival,growth,transformation and maintenance.The consequence of such perturbations is resulted in the alteration of bile secretion,gluconeogenesis,glycolysis,detoxification and metabolism of carbohydrates,proteins,fat and balance of nutrients.The identification and elucidation of the molecular pathways perturbed by the viral proteins are important in order to design effective strategy to minimize and/or restore the hepatocytes injury.
文摘目的用生物信息学分析新基因TSC21并进行蛋白表达及纯化。方法将不同发育阶段的小鼠睾丸组织cDNA探针与Affymetrix全基因组芯片进行杂交并筛选出差异表达的基因。用生物学信息软件对该基因进行生物学信息分析。运用RT-PCR分析该基因小鼠不同组织及人不同组织中的表达。对人的TSC21基因进行cDNA克隆、蛋白表达及纯化。结果通过不同日龄小鼠睾丸的芯片信号比较筛选出一个差异表达基因(GenBank登录号:NM-028825),全长有810bp,含有543bp的完整ORF,编码一个有180个氨基酸、分子量为21.040kDa的蛋白质,我们将其命名为TSC21。亚细胞定位预测显示TSC21基因可能在细胞核中表达。基因功能域预测表明在氨基酸34-40处有CK1和CK2磷酸化位点,在氨基酸100-106处有PKA(cAMP-dependent protein kinase A)磷酸化位点。RT-PCR分析表明TSC21基因特异性表达于小鼠睾丸组织。TSC21蛋白在人的同源基因GenBank登录号为NM-152670,在180个氨基酸区域内有82%的同源性,人TSC21(hTSC21)基因特异性地表达于人睾丸组织中。成功构建PET-28a2c(+)vector/hTSC21表达载体,并转化BL21,以IPTG诱导蛋白表达,对诱导剂浓度、诱导时间进行优化后以镍离子亲和层析纯化目的蛋白。结论TSC21基因在小鼠及人的睾丸组织中特异性表达并具有高度同源性,显示其可能在精子发生中起着重要作用。所得人TSC21蛋白可进行其蛋白结构活性、睾丸组织中的定位分布及在男性不育等疾病检测的研究。
