信号传导与转录活化因子3(signal transducers and activators of transcription,STAT3)信号通路参与细胞因子及生长因子介导的信号转导。STAT3的持续激活与多种肿瘤的发生发展密切相关。STAT3可影响以DNA及组蛋白修饰为主的表观遗传修...信号传导与转录活化因子3(signal transducers and activators of transcription,STAT3)信号通路参与细胞因子及生长因子介导的信号转导。STAT3的持续激活与多种肿瘤的发生发展密切相关。STAT3可影响以DNA及组蛋白修饰为主的表观遗传修饰的异常调控:一方面,表观遗传修饰相关酶类可受到STAT3的转录调节;另一方面,STAT3可与其形成功能复合物调控其下游基因表达。STAT3的非磷酸化形式亦可直接影响局部表观遗传修饰。STAT3通过与表观遗传修饰系统的相互作用,可影响局部染色质构象,参与下游关键基因的转录调节,也可维持自身信号通路在肿瘤中的持续活化。阐明STAT3信号通路与表观遗传修饰异常的调控关系,将有助于进一步明确相关肿瘤的发病机制,为临床治疗提供新途径。展开更多
Sucrose synthases(SUS) are a family of enzymes that play pivotal roles in carbon partitioning, sink strength and plant development. A total of 11 SUS genes have been identified in the genome of Malus domestica(Md SUSs...Sucrose synthases(SUS) are a family of enzymes that play pivotal roles in carbon partitioning, sink strength and plant development. A total of 11 SUS genes have been identified in the genome of Malus domestica(Md SUSs), and phylogenetic analysis revealed that the Md SUS genes were divided into three groups, named as SUS I, SUS II and SUS III, respectively. The SUS I and SUS III groups included four homologs each, whereas the SUS II group contained three homologs. SUS genes in the same group showed similar structural characteristics, such as exon number, size and length distribution. After assessing four different tissues, Md SUS1 s and Md SUS2.1 showed the highest expression in fruit, whereas Md SUS2.2/2.3 and Md SUS3 s exhibit the highest expression in shoot tips. Most Md SUSs showed decreased expression during fruit development, similar to SUS enzyme activity, but both Md SUS2.1 and Md SUS1.4 displayed opposite expression profiles. These results suggest that different Md SUS genes might play distinct roles in the sink-source sugar cycle and sugar utilization in apple sink tissues.展开更多
文摘信号传导与转录活化因子3(signal transducers and activators of transcription,STAT3)信号通路参与细胞因子及生长因子介导的信号转导。STAT3的持续激活与多种肿瘤的发生发展密切相关。STAT3可影响以DNA及组蛋白修饰为主的表观遗传修饰的异常调控:一方面,表观遗传修饰相关酶类可受到STAT3的转录调节;另一方面,STAT3可与其形成功能复合物调控其下游基因表达。STAT3的非磷酸化形式亦可直接影响局部表观遗传修饰。STAT3通过与表观遗传修饰系统的相互作用,可影响局部染色质构象,参与下游关键基因的转录调节,也可维持自身信号通路在肿瘤中的持续活化。阐明STAT3信号通路与表观遗传修饰异常的调控关系,将有助于进一步明确相关肿瘤的发病机制,为临床治疗提供新途径。
基金supported in part by the National Natural Science Foundation of China (31372038)the Natural Basic Research Plan in Shaanxi Province of China (2015JQ3082)
文摘Sucrose synthases(SUS) are a family of enzymes that play pivotal roles in carbon partitioning, sink strength and plant development. A total of 11 SUS genes have been identified in the genome of Malus domestica(Md SUSs), and phylogenetic analysis revealed that the Md SUS genes were divided into three groups, named as SUS I, SUS II and SUS III, respectively. The SUS I and SUS III groups included four homologs each, whereas the SUS II group contained three homologs. SUS genes in the same group showed similar structural characteristics, such as exon number, size and length distribution. After assessing four different tissues, Md SUS1 s and Md SUS2.1 showed the highest expression in fruit, whereas Md SUS2.2/2.3 and Md SUS3 s exhibit the highest expression in shoot tips. Most Md SUSs showed decreased expression during fruit development, similar to SUS enzyme activity, but both Md SUS2.1 and Md SUS1.4 displayed opposite expression profiles. These results suggest that different Md SUS genes might play distinct roles in the sink-source sugar cycle and sugar utilization in apple sink tissues.
