△^12 fatty acid desaturase gene has been targeted as a logical candidate controlling the high oleate trait in peanut seeds. By RT-PCR method, the full-length cDNAs of △^12 fatty acid desaturase gene were isolated fr...△^12 fatty acid desaturase gene has been targeted as a logical candidate controlling the high oleate trait in peanut seeds. By RT-PCR method, the full-length cDNAs of △^12 fatty acid desaturase gene were isolated from peanut （Arachis hypogaea L.） genotypes with normal and high ratio of oleic to linoleic acid, which were designated AhFAD2B and AhFAD2B＇, respectively. Sequence alignment of their coding regions revealed that an extra A was inserted at the position ＋442 bp of AhFAD2B＇ sequence of high oleic acid genotypes, which resulted in the shift of open reading frame and a truncated protein AhFAD2B＇, with the loss of one histidine box involved in metal ion complex required for the reduction of oxygen. Analysis of transcript level showed that the expression of △^12 fatty acid desaturase gene in high oleic acid genotype was slightly lower than that in normal genotype. The enzyme activity experiment of yeast （Saccharomyces cerevisiae） cell transformed with AhFAD2B or AhFAD2B＇ proved that only AhFAD2B gene product showed significant △^12 fatty acid desaturase activity, but AhFAD2B＇ gene product did not. These results suggested that the change of AhFAD2B＇ gene sequence resulted in lower activity or deactivation of △^12 fatty acid desaturase in high oleic acid genotype.展开更多
Virus-induced gene silencing is regarded as a powerful and efficient tool for the analysis of gene function in plants because it is simple, rapid and transformation-free. It has been used to perform both forward and r...Virus-induced gene silencing is regarded as a powerful and efficient tool for the analysis of gene function in plants because it is simple, rapid and transformation-free. It has been used to perform both forward and reverse genetics to identify plant functional genes. Many viruses have been developed into virus-induced gene silencing vectors and gene functions involved in development, biotic and abiotic stresses, metabolism, and cellular signaling have been reported. In this review, we discuss the development and application of virus-induced gene silencing in plant functional genomics.展开更多
目的探讨康艾注射液联合注射用盐酸吉西他滨治疗非小细胞肺癌的临床疗效。方法选取西安交通大学医学院第一附属医院2013年1月—2015年1月就诊的非小细胞肺癌患者100例,将患者随机分为对照组和治疗组,每组各50例。对照组给予注射用盐酸...目的探讨康艾注射液联合注射用盐酸吉西他滨治疗非小细胞肺癌的临床疗效。方法选取西安交通大学医学院第一附属医院2013年1月—2015年1月就诊的非小细胞肺癌患者100例,将患者随机分为对照组和治疗组,每组各50例。对照组给予注射用盐酸吉西他滨1 200 mg/m^2,加入100 m L生理盐水中,第1、8天静脉滴注。治疗组在对照组基础上静脉滴注康艾注射液50 m L/m^2,加入250 m L生理盐水中,连续使用14 d。两组均连续治疗21 d。观察两组的临床疗效,同时比较治疗前后两组患者的免疫功能指标、蛋白表达和毒副反应。结果治疗后,对照组、治疗组的客观有效率分别为48.0%、66.0%,两组比较差异有统计学意义(P<0.05)。两组疾病控制率比较差异无显著性。治疗后,两组CD^(4+)、CD^(4+)/CD^(8+)明显上升,同组治疗前后比较差异具有统计学意义(P<0.05);且治疗组CD^(3+)、CD^(4+)、CD^(4+)/CD^(8+)明显上升CD^(8+)明显下降,其改善程度优于对照组,两组比较差异具有统计学意义(P<0.05)。治疗后,治疗组Ki67蛋白、bcl-2蛋白表达水平明显降低,bax蛋白表达水平明显升高,两组比较差异有统计学意义(P<0.05)。治疗后,治疗组血小板减少、白细胞下降、红细胞减少发生率明显低于对照组,两组比较差异有统计学意义(P<0.05)。但两组ALT异常升高、恶心呕吐的发生率比较差异无统计学意义。结论康艾注射液联合注射用盐酸吉西他滨治疗非小细胞肺癌具有较好的临床疗效,能够增强患者免疫功能,改善蛋白表达,降低毒副反应,具有一定的临床推广应用价值。展开更多
文摘△^12 fatty acid desaturase gene has been targeted as a logical candidate controlling the high oleate trait in peanut seeds. By RT-PCR method, the full-length cDNAs of △^12 fatty acid desaturase gene were isolated from peanut （Arachis hypogaea L.） genotypes with normal and high ratio of oleic to linoleic acid, which were designated AhFAD2B and AhFAD2B＇, respectively. Sequence alignment of their coding regions revealed that an extra A was inserted at the position ＋442 bp of AhFAD2B＇ sequence of high oleic acid genotypes, which resulted in the shift of open reading frame and a truncated protein AhFAD2B＇, with the loss of one histidine box involved in metal ion complex required for the reduction of oxygen. Analysis of transcript level showed that the expression of △^12 fatty acid desaturase gene in high oleic acid genotype was slightly lower than that in normal genotype. The enzyme activity experiment of yeast （Saccharomyces cerevisiae） cell transformed with AhFAD2B or AhFAD2B＇ proved that only AhFAD2B gene product showed significant △^12 fatty acid desaturase activity, but AhFAD2B＇ gene product did not. These results suggested that the change of AhFAD2B＇ gene sequence resulted in lower activity or deactivation of △^12 fatty acid desaturase in high oleic acid genotype.
基金supported by the National Transgenic Research Projects of China (Grant No. 2009ZX08009-026B)
文摘Virus-induced gene silencing is regarded as a powerful and efficient tool for the analysis of gene function in plants because it is simple, rapid and transformation-free. It has been used to perform both forward and reverse genetics to identify plant functional genes. Many viruses have been developed into virus-induced gene silencing vectors and gene functions involved in development, biotic and abiotic stresses, metabolism, and cellular signaling have been reported. In this review, we discuss the development and application of virus-induced gene silencing in plant functional genomics.
文摘目的探讨康艾注射液联合注射用盐酸吉西他滨治疗非小细胞肺癌的临床疗效。方法选取西安交通大学医学院第一附属医院2013年1月—2015年1月就诊的非小细胞肺癌患者100例,将患者随机分为对照组和治疗组,每组各50例。对照组给予注射用盐酸吉西他滨1 200 mg/m^2,加入100 m L生理盐水中,第1、8天静脉滴注。治疗组在对照组基础上静脉滴注康艾注射液50 m L/m^2,加入250 m L生理盐水中,连续使用14 d。两组均连续治疗21 d。观察两组的临床疗效,同时比较治疗前后两组患者的免疫功能指标、蛋白表达和毒副反应。结果治疗后,对照组、治疗组的客观有效率分别为48.0%、66.0%,两组比较差异有统计学意义(P<0.05)。两组疾病控制率比较差异无显著性。治疗后,两组CD^(4+)、CD^(4+)/CD^(8+)明显上升,同组治疗前后比较差异具有统计学意义(P<0.05);且治疗组CD^(3+)、CD^(4+)、CD^(4+)/CD^(8+)明显上升CD^(8+)明显下降,其改善程度优于对照组,两组比较差异具有统计学意义(P<0.05)。治疗后,治疗组Ki67蛋白、bcl-2蛋白表达水平明显降低,bax蛋白表达水平明显升高,两组比较差异有统计学意义(P<0.05)。治疗后,治疗组血小板减少、白细胞下降、红细胞减少发生率明显低于对照组,两组比较差异有统计学意义(P<0.05)。但两组ALT异常升高、恶心呕吐的发生率比较差异无统计学意义。结论康艾注射液联合注射用盐酸吉西他滨治疗非小细胞肺癌具有较好的临床疗效,能够增强患者免疫功能,改善蛋白表达,降低毒副反应,具有一定的临床推广应用价值。
