采用基于液相色谱-高分辨质谱的转录因子结合序列串联多拷贝双联DNA结合元件(Concatenated tandem array of transcription factor response elements,catTFRE)Pull down蛋白质组学技术,研究了曲妥珠单抗耐药胃癌细胞的转录因子及其调...采用基于液相色谱-高分辨质谱的转录因子结合序列串联多拷贝双联DNA结合元件(Concatenated tandem array of transcription factor response elements,catTFRE)Pull down蛋白质组学技术,研究了曲妥珠单抗耐药胃癌细胞的转录因子及其调控作用。以合成的串联转录因子结合序列DNA片段为亲和试剂,用生物素标记,作为"DNA诱饵",通过Pull down富集后,采用液相色谱-高分辨质谱检测捕获的转录因子,基于强度定量法(Intensity based absolute quantification,iBAQ)定量,筛选出与DNA结合活性显著变化的转录因子。利用WebGestalt(2017)数据库对激活转录因子调控的信号通路、家族分类、调控网络及转录因子-靶基因(TFs-targets)进行分析。结果表明,359个转录因子被定量检测,与亲本细胞相比,61个转录因子在曲妥珠单抗耐药胃癌细胞中与DNA结合活性显著变化,其中结合活性增强48个,活性降低13个。激活转录因子属于bZIP、bHLH、homebox、HMG box、Zine finger等家族。KEGG通路富集显示,癌症、MAPK、Wnt、TGF-β、凋亡等多条通路在耐药细胞中显著改变。TFs-targets分析表明,TCF7L2、TCF7、FOXC1、JUN、CYC、FOS、ELK4、NFκB2、DDIT3和ATF2在上皮-间质转化(Epithelial-mesenchymal transformation,EMT)、Wnt、MAPK信号通路促使胃癌曲妥珠单抗耐药过程中发挥重要调控作用,提示靶向这些转录因子所调控的信号通路可能是逆转胃癌曲妥珠单抗耐药的重要途径。展开更多
[Objective] Taqman Quantitative PCR technique was adopted to detect the copies of exogenous nos terminator in transgenic hybrid soybean.[Method] With soybean Lectin as the endogenous reference gene,and gene complex DN...[Objective] Taqman Quantitative PCR technique was adopted to detect the copies of exogenous nos terminator in transgenic hybrid soybean.[Method] With soybean Lectin as the endogenous reference gene,and gene complex DNA in non-GMO soybeans as the endogenous reference standard,the method of gradient dilution was used for separately calculate Ct value of endogenous reference gene and plasmid DNA and correlation standard curve equation of logarithm of copies,and then to calculate the copies of samples through substituting thus-obtained Ct into the standard curve equation.[Result] The standard curve equation of endogenous reference gene is y=-3.422x＋35.201,R2=0.998;and the standard curve equation of exogenous gene is y=-3.348x＋34.890,R2=0.999.Nos terminator and its lower boundary sequences in transgenic soybean is of single copy.[Conclusion] The study has provided a theoretical basis for determining exogenous gene copies in transgenic soybean.展开更多
AIM: To investigate the copy number variation of NACO3 gene in colorectal cancer (CRC) and its correlation with tumor progression. METHODS: A total of 142 samples of case-matched CRC tissues and adjacent normal tissue...AIM: To investigate the copy number variation of NACO3 gene in colorectal cancer (CRC) and its correlation with tumor progression. METHODS: A total of 142 samples of case-matched CRC tissues and adjacent normal tissues were obtained from patients undergoing bowel resection. Quantitative real-time polymerase chain reaction method was used to investigate the copy number variations of NCOA3 as well as gene expression in the collected tissues. RESULTS: Copy number gains of NCOA3 were detected in 39 CRC samples (27.5%) and were correlatedwith tumor progression (χ2 = 6.42, P = 0.0112). Moreover, there was a positive correlation between copy number gain and mRNA over-expression of NCOA3 in CRCs (P = 0.0023). Expression level of NCOA3 mRNA was also enhanced in the CRC samples with unaltered copy numbers (3.85 ± 1.23 vs 2.71 ± 0.64, P < 0.01). CONCLUSION: Sporadic colorectal cancers exhibit different mechanisms of NCOA3 regulation.展开更多
基金Funded by Program of Technology Bureau of Harbin(2010RFQXN101)Sub-project of Transgenic Significant Specific Project(2008ZX08012-001)~~
文摘[Objective] Taqman Quantitative PCR technique was adopted to detect the copies of exogenous nos terminator in transgenic hybrid soybean.[Method] With soybean Lectin as the endogenous reference gene,and gene complex DNA in non-GMO soybeans as the endogenous reference standard,the method of gradient dilution was used for separately calculate Ct value of endogenous reference gene and plasmid DNA and correlation standard curve equation of logarithm of copies,and then to calculate the copies of samples through substituting thus-obtained Ct into the standard curve equation.[Result] The standard curve equation of endogenous reference gene is y=-3.422x＋35.201,R2=0.998;and the standard curve equation of exogenous gene is y=-3.348x＋34.890,R2=0.999.Nos terminator and its lower boundary sequences in transgenic soybean is of single copy.[Conclusion] The study has provided a theoretical basis for determining exogenous gene copies in transgenic soybean.
基金Supported by Fundamental Research Plan of Shenzhen City, No. JC201005260215A
文摘AIM: To investigate the copy number variation of NACO3 gene in colorectal cancer (CRC) and its correlation with tumor progression. METHODS: A total of 142 samples of case-matched CRC tissues and adjacent normal tissues were obtained from patients undergoing bowel resection. Quantitative real-time polymerase chain reaction method was used to investigate the copy number variations of NCOA3 as well as gene expression in the collected tissues. RESULTS: Copy number gains of NCOA3 were detected in 39 CRC samples (27.5%) and were correlatedwith tumor progression (χ2 = 6.42, P = 0.0112). Moreover, there was a positive correlation between copy number gain and mRNA over-expression of NCOA3 in CRCs (P = 0.0023). Expression level of NCOA3 mRNA was also enhanced in the CRC samples with unaltered copy numbers (3.85 ± 1.23 vs 2.71 ± 0.64, P < 0.01). CONCLUSION: Sporadic colorectal cancers exhibit different mechanisms of NCOA3 regulation.
