Hypocotyl segments from aseptic seedlings of two important cultivars of upland cotton ( Gossypium hirsutum L.) in Northwest China, 'Xinluzao_1', 'Jinmian_7', 'Jinmian_12' and 'Jihe_321&#...Hypocotyl segments from aseptic seedlings of two important cultivars of upland cotton ( Gossypium hirsutum L.) in Northwest China, 'Xinluzao_1', 'Jinmian_7', 'Jinmian_12' and 'Jihe_321' were transformed respectively by two efficient plant expression plasmids pBinMoBc and pBinoBc via Agrobacterium tumefaciens . In pBinMoBc, cry 1Ac3 gene, which encodes the Bt toxin, is under the control of chimeric OM promoter. In pBinoBc, it is under control of CaMV 35S promoter. After co_cultivation with Agrobacterium tumefimpfaciens LBA4404 (containing pBinMoBc or pBinoBc), kanamycin_resistant selection, somatic embryos were induced and regenerated plants were obtained. Then the regenerated plantlets were grafted to untransformed stocks in greenhouse to produce descendants. The integration of cry 1Ac3 gene and its expression in T 2 generation of transgenic cotton plants were confirmed by Southern hybridization and Western blotting. The analyses of insect bioassay indicated that the transgenic plants of both constructions have significant resistance to the larvae of cotton bollworm ( Heliothis armigera ) and that cry 1Ac3 gene driven by chimeric OM promoter could endue T 2 generation cotton with high pest_resistant ability, implicating that it has a profound application in genetic engineering to breed new pest_resistant cotton varieties.展开更多
目的绘制肠型胃癌的超级增强子重塑图谱,揭示超级增强子的肿瘤生物学功能及可能激活的下游靶基因。方法收集陆军特色医学中心消化内科2022年1-12月收治行内镜检查、治疗的患者的31例正常胃黏膜组织、23例肠型胃癌组织及9例肠型胃癌类器...目的绘制肠型胃癌的超级增强子重塑图谱,揭示超级增强子的肿瘤生物学功能及可能激活的下游靶基因。方法收集陆军特色医学中心消化内科2022年1-12月收治行内镜检查、治疗的患者的31例正常胃黏膜组织、23例肠型胃癌组织及9例肠型胃癌类器官进行靶向组蛋白H3K27ac修饰的染色质靶向捕获(cleavage under targets and tagmentation,CUT&Tag)测序,基于生物信息学工具描绘肠型胃癌的超级增强子重塑特征并鉴定关键靶基因;利用CRISPRi技术干预超级增强子,Western blot检测靶基因的表达,并采用CCK-8法和Transwell迁移、侵袭实验检测对照组细胞及干预组细胞的增殖、迁移、侵袭能力。结果肠型胃癌组织与正常胃黏膜组织超级增强子信号差异明显(P<0.05),癌组织中的活性超级增强子可能参与免疫系统的负向调节、细胞黏附等生物学过程;在肿瘤细胞中表达上调的细胞迁移诱导蛋白(cell migration-inducing protein,CEMIP)受到超级增强子的调控,干预超级增强子后肿瘤细胞CEMIP蛋白表达量下降(P<0.05),细胞增殖率、相对迁移面积和相对侵袭面积也随之下降(P<0.05)。结论肠型胃癌发生了超级增强子重塑,其下游靶基因CEMIP可促进癌细胞生长、迁移和侵袭。展开更多
文摘Hypocotyl segments from aseptic seedlings of two important cultivars of upland cotton ( Gossypium hirsutum L.) in Northwest China, 'Xinluzao_1', 'Jinmian_7', 'Jinmian_12' and 'Jihe_321' were transformed respectively by two efficient plant expression plasmids pBinMoBc and pBinoBc via Agrobacterium tumefaciens . In pBinMoBc, cry 1Ac3 gene, which encodes the Bt toxin, is under the control of chimeric OM promoter. In pBinoBc, it is under control of CaMV 35S promoter. After co_cultivation with Agrobacterium tumefimpfaciens LBA4404 (containing pBinMoBc or pBinoBc), kanamycin_resistant selection, somatic embryos were induced and regenerated plants were obtained. Then the regenerated plantlets were grafted to untransformed stocks in greenhouse to produce descendants. The integration of cry 1Ac3 gene and its expression in T 2 generation of transgenic cotton plants were confirmed by Southern hybridization and Western blotting. The analyses of insect bioassay indicated that the transgenic plants of both constructions have significant resistance to the larvae of cotton bollworm ( Heliothis armigera ) and that cry 1Ac3 gene driven by chimeric OM promoter could endue T 2 generation cotton with high pest_resistant ability, implicating that it has a profound application in genetic engineering to breed new pest_resistant cotton varieties.
文摘目的绘制肠型胃癌的超级增强子重塑图谱,揭示超级增强子的肿瘤生物学功能及可能激活的下游靶基因。方法收集陆军特色医学中心消化内科2022年1-12月收治行内镜检查、治疗的患者的31例正常胃黏膜组织、23例肠型胃癌组织及9例肠型胃癌类器官进行靶向组蛋白H3K27ac修饰的染色质靶向捕获(cleavage under targets and tagmentation,CUT&Tag)测序,基于生物信息学工具描绘肠型胃癌的超级增强子重塑特征并鉴定关键靶基因;利用CRISPRi技术干预超级增强子,Western blot检测靶基因的表达,并采用CCK-8法和Transwell迁移、侵袭实验检测对照组细胞及干预组细胞的增殖、迁移、侵袭能力。结果肠型胃癌组织与正常胃黏膜组织超级增强子信号差异明显(P<0.05),癌组织中的活性超级增强子可能参与免疫系统的负向调节、细胞黏附等生物学过程;在肿瘤细胞中表达上调的细胞迁移诱导蛋白(cell migration-inducing protein,CEMIP)受到超级增强子的调控,干预超级增强子后肿瘤细胞CEMIP蛋白表达量下降(P<0.05),细胞增殖率、相对迁移面积和相对侵袭面积也随之下降(P<0.05)。结论肠型胃癌发生了超级增强子重塑,其下游靶基因CEMIP可促进癌细胞生长、迁移和侵袭。
