Phenolamides(PAs), a diverse group of specialized metabolites, including hydroxycinnamoylputrescine(HP), hydroxycinnamoylagmatine, and hydroxycinnamoyltryptamine, are important in plant resistance to biotic stress. Ho...Phenolamides(PAs), a diverse group of specialized metabolites, including hydroxycinnamoylputrescine(HP), hydroxycinnamoylagmatine, and hydroxycinnamoyltryptamine, are important in plant resistance to biotic stress. However, the genes involved in the biosynthesis and modulation of PAs have not been fully elucidated. This study identified an HP biosynthetic gene cluster in rice(Oryza sativa) comprising one gene(Os ODC) encoding a decarboxylase and two tandem-duplicated genes(Os PHT3 and Os PHT4)encoding putrescine hydroxycinnamoyl acyltransferases coexpressed in different tissues. Os ODC catalyzes the conversion of ornithine to putrescine, which is used in HP biosynthesis involving Os PHT3 and Os PHT4. Os PHT3 or Os PHT4 overexpression causes HP accumulation and cell death and putrescine hydroxycinnamoyl acyltransferases(PHT) activity-dependent resistance against the fungal pathogen Magnaporthe oryzae. Os ODC overexpression plants also confer enhanced resistance to M. oryzae.Notably, the basic leucine zipper transcription factor APIP5, a negative regulator of cell death, directly binds to the Os PHT4 promoter, repressing its transcription. Moreover, APIP5 suppression induces Os PHT4 expression and HP accumulation. Comparative genomic analysis revealed that the HP biosynthetic gene cluster is conserved in monocots. These results characterized a previously unidentified monocot-specific gene cluster that is involved in HP biosynthesis and contributes to defense and cell death in rice.展开更多
目的构建幽门螺杆菌(Helicobacter pylori,Hp)hp0169基因的敲除突变株,研究其在Hp感染GES-1细胞中的作用。方法敲除质粒pSJHK为模板,通过同源重组双交换的方法构建hp0169基因敲除突变株(Δ0169),分析其与野生26695株的生长曲线及琼脂表...目的构建幽门螺杆菌(Helicobacter pylori,Hp)hp0169基因的敲除突变株,研究其在Hp感染GES-1细胞中的作用。方法敲除质粒pSJHK为模板,通过同源重组双交换的方法构建hp0169基因敲除突变株(Δ0169),分析其与野生26695株的生长曲线及琼脂表面菌落扩散情况;通过FITC标记法检测两菌株对GES-1细胞的吸附率;以感染复数(MOI=200)构建Hp感染GES-1细胞体系,比较Δ0169突变株与野生株感染后致细胞凋亡及细胞活性变化的差异。结果通过质粒敲除、电击转化成功获得hp0169基因敲除突变株Δ0169。该突变株与野生菌株的生长曲线、琼脂表面菌落扩散情况基本一致,对GES-1细胞的吸附率差异无统计学意义(t值为1.102,P>0.05)。Δ0169突变株与野生株感染GES-1细胞活力分别为6h(0.74±9.56)%、(0.90±6.31)%,12h(0.53±7.89)%、(0.73±8.31)%,差异均有统计学意义(t值分别为-3.474,-2.880,P<0.05);野生组和突变组GES-1细胞凋亡率分别为6h(19.2±11.03)%、(20.4±8.67)%和12h(29.3±14.47)%、(28.6±10.32)%,差异均无统计学意义(t值分别为-0.995,0.218,P>0.05)。结论 Hp hp0169基因敲除后不影响其生长、运动以及对GES-1细胞的吸附,不影响细菌感染GES-1细胞致细胞凋亡的程度,但影响细菌感染致细胞活力下降的程度。这对研究Hp感染及致病机制有重要意义。展开更多
目的探讨糖尿病患者结合珠蛋白基因多态性与冠状动脉狭窄严重程度的相关性。方法选择98例糖尿病合并冠心病患者以及77例单纯糖尿病患者,采用PCR-SSP技术检测结合珠蛋白基因型,据此对糖尿病合并冠心病患者进行分组,采用Gensini冠状动脉...目的探讨糖尿病患者结合珠蛋白基因多态性与冠状动脉狭窄严重程度的相关性。方法选择98例糖尿病合并冠心病患者以及77例单纯糖尿病患者,采用PCR-SSP技术检测结合珠蛋白基因型,据此对糖尿病合并冠心病患者进行分组,采用Gensini冠状动脉评分系统(Gensini积分)对冠状动脉的狭窄程度进行评分。结果糖尿病合并冠心病组Hp基因型分布与单纯糖尿病组相比差异有统计学意义,表现为Hp2-2基因型在糖尿病合并冠心病组的频率明显高于单纯糖尿病组(0.55 vs 0.35,P<0.05)。糖尿病合并冠心病组间,Hp2-2基因型组的Gensini积分明显高于Hp1-1/Hp1-2基因型组(P<0.05)。结论 Hp2-2基因型可能与糖尿病患者冠心病的发生相关,且与糖尿病患者冠脉狭窄的严重程度相关。展开更多
基金supported by grants from the National Natural Science Foundation of China (31822041 and 31972225)the National Key Research and Development Program of China (2016YFD0100600) to Yuese Ning+5 种基金the National Natural Science Foundation of China (U20A2021) to Ruyi Wangthe National Natural Science Foundation of China (31801692) to Fan Zhangthe State Key Program of National Natural Science Foundation of China (31530052)the National Science Fund for Distinguished Young Scholars (31625021)the Foundation for Innovative Research Groups of the National Natural Science Foundation of China (31821005)the Hainan University Start up Fund (KYQD(ZR)1866 to Jie Luo。
文摘Phenolamides(PAs), a diverse group of specialized metabolites, including hydroxycinnamoylputrescine(HP), hydroxycinnamoylagmatine, and hydroxycinnamoyltryptamine, are important in plant resistance to biotic stress. However, the genes involved in the biosynthesis and modulation of PAs have not been fully elucidated. This study identified an HP biosynthetic gene cluster in rice(Oryza sativa) comprising one gene(Os ODC) encoding a decarboxylase and two tandem-duplicated genes(Os PHT3 and Os PHT4)encoding putrescine hydroxycinnamoyl acyltransferases coexpressed in different tissues. Os ODC catalyzes the conversion of ornithine to putrescine, which is used in HP biosynthesis involving Os PHT3 and Os PHT4. Os PHT3 or Os PHT4 overexpression causes HP accumulation and cell death and putrescine hydroxycinnamoyl acyltransferases(PHT) activity-dependent resistance against the fungal pathogen Magnaporthe oryzae. Os ODC overexpression plants also confer enhanced resistance to M. oryzae.Notably, the basic leucine zipper transcription factor APIP5, a negative regulator of cell death, directly binds to the Os PHT4 promoter, repressing its transcription. Moreover, APIP5 suppression induces Os PHT4 expression and HP accumulation. Comparative genomic analysis revealed that the HP biosynthetic gene cluster is conserved in monocots. These results characterized a previously unidentified monocot-specific gene cluster that is involved in HP biosynthesis and contributes to defense and cell death in rice.
文摘目的构建幽门螺杆菌(Helicobacter pylori,Hp)hp0169基因的敲除突变株,研究其在Hp感染GES-1细胞中的作用。方法敲除质粒pSJHK为模板,通过同源重组双交换的方法构建hp0169基因敲除突变株(Δ0169),分析其与野生26695株的生长曲线及琼脂表面菌落扩散情况;通过FITC标记法检测两菌株对GES-1细胞的吸附率;以感染复数(MOI=200)构建Hp感染GES-1细胞体系,比较Δ0169突变株与野生株感染后致细胞凋亡及细胞活性变化的差异。结果通过质粒敲除、电击转化成功获得hp0169基因敲除突变株Δ0169。该突变株与野生菌株的生长曲线、琼脂表面菌落扩散情况基本一致,对GES-1细胞的吸附率差异无统计学意义(t值为1.102,P>0.05)。Δ0169突变株与野生株感染GES-1细胞活力分别为6h(0.74±9.56)%、(0.90±6.31)%,12h(0.53±7.89)%、(0.73±8.31)%,差异均有统计学意义(t值分别为-3.474,-2.880,P<0.05);野生组和突变组GES-1细胞凋亡率分别为6h(19.2±11.03)%、(20.4±8.67)%和12h(29.3±14.47)%、(28.6±10.32)%,差异均无统计学意义(t值分别为-0.995,0.218,P>0.05)。结论 Hp hp0169基因敲除后不影响其生长、运动以及对GES-1细胞的吸附,不影响细菌感染GES-1细胞致细胞凋亡的程度,但影响细菌感染致细胞活力下降的程度。这对研究Hp感染及致病机制有重要意义。
文摘目的探讨糖尿病患者结合珠蛋白基因多态性与冠状动脉狭窄严重程度的相关性。方法选择98例糖尿病合并冠心病患者以及77例单纯糖尿病患者,采用PCR-SSP技术检测结合珠蛋白基因型,据此对糖尿病合并冠心病患者进行分组,采用Gensini冠状动脉评分系统(Gensini积分)对冠状动脉的狭窄程度进行评分。结果糖尿病合并冠心病组Hp基因型分布与单纯糖尿病组相比差异有统计学意义,表现为Hp2-2基因型在糖尿病合并冠心病组的频率明显高于单纯糖尿病组(0.55 vs 0.35,P<0.05)。糖尿病合并冠心病组间,Hp2-2基因型组的Gensini积分明显高于Hp1-1/Hp1-2基因型组(P<0.05)。结论 Hp2-2基因型可能与糖尿病患者冠心病的发生相关,且与糖尿病患者冠脉狭窄的严重程度相关。
