A specialized test of two-hybrid library type three-frame cDNA yeast for Muskmelon Fusarium oxysporum using the switching mechanism at the 5'end of RNA template(SMART)technology was constructed to screen for inter...A specialized test of two-hybrid library type three-frame cDNA yeast for Muskmelon Fusarium oxysporum using the switching mechanism at the 5'end of RNA template(SMART)technology was constructed to screen for interaction protein genes for wilt disease and to further research the molecular mechanisms of Fusarium oxysporum pathogenesis to explain the interactions between plant and pathogen.A 500-bp cDNA was purified and extracted using SMART and LD-PCR technology to synthesize ds cDNA and was then homogenized and purified to remove the fragments.After processing,the ds cDNA was connected to three types of reading frame pGADT7-SfiI carriers,and the three connection products in E.coli Electrocell were used to build the primary cDNA library.The titer of three ORF cDNA primary library storage capacities was 2.6×10^6,1.8×10^6 and 3×10^6 cfu;the PCR identification of the ORF 1 and 2 gene recombination rate was 94%,the ORF 3 gene recombination rate was 100%,and the insert length distribution was 0.5-4.0 kb as a single band.To reach the quality requirements for library construction,three kinds of reading frame cDNA primary libraries were mixed and amplified,and the plasmid was transformed into the Y187 yeast strain.The titer of the Y187 yeast library was determined to be 3.5×107 cfu?mL-1,and the base of the yeast library was approximately 1 600 000 cfu.The results showed that the construction of muskmelon Fusarium-specific two-hybrid library type three-frame cDNA yeast had a higher reservoir capacity and recombination rate and met the yeast two-hybrid screening requirements.展开更多
以短季棉中棉所36(CCRI 36)顶端分生组织和花蕾为材料,以DSN(duplex-specific nuclease)均一化技术与SMART(switching mechanism at 5′end of RNAtranscript)建库技术相结合,构建CCRI 36花发育期均一化全长cDNA文库。经检测原始文库滴...以短季棉中棉所36(CCRI 36)顶端分生组织和花蕾为材料,以DSN(duplex-specific nuclease)均一化技术与SMART(switching mechanism at 5′end of RNAtranscript)建库技术相结合,构建CCRI 36花发育期均一化全长cDNA文库。经检测原始文库滴度为1.7×106cfumL-1。随机挑取100个克隆,利用PCR方法测得文库重组率达100%,插入片段平均长度为1.2kb。以两个高丰度表达基因Histon3和UBQ7为探针,进行虚拟Northern blot检测显示,其丰度在均一化cDNA中均明显降低,说明均一化效果显著,为节约筛库成本和EST有效测序奠定了基础;同时,利用常规PCR扩增技术从cDNA文库中筛选阳性信号,获得了花发育相关蛋白基因。初步证实CCRI36花发育期均一化全长cDNA文库构建成功,为深入研究棉花花发育机理及发掘与早熟相关的功能基因奠定了基础。展开更多
分别提取锯缘青蟹Scylla serrata卵巢、精巢、眼柄、促雄腺的总RNA,等量混合后经oligotex试剂分离mRNA,利用SMART(Switch mechanisms at the 5′end of RNA transcript)技术及DSN(duplex-specific nuclease)的特性构建线性化cDNA质粒文...分别提取锯缘青蟹Scylla serrata卵巢、精巢、眼柄、促雄腺的总RNA,等量混合后经oligotex试剂分离mRNA,利用SMART(Switch mechanisms at the 5′end of RNA transcript)技术及DSN(duplex-specific nuclease)的特性构建线性化cDNA质粒文库。经检测文库约含有5.3×107重组子,扩增后的文库含有1011以上重组子。文库的插入cDNA长度为0.5—2.5kb,重组率大于98%。从构建的文库中随机挑取5 202个克隆进行大规模EST测序,获得3 346条ESTs,其中长度大于100bp的高质量ESTs 2 697条。经拼接与软件分析,2 697 ESTs代表了2 522个Unigenes,包括2 355个Singlets和167个Contigs,冗余率6.49%。EST序列经生物信息学分析(BLASTX,e<10-6),发现了Sry-like protein C、Sox14 protein、Sox4b、sex-determining protein fem-1、vitellogenin、vitellogenin receptor、cyclin A、cathepsin C和cyclin-dependent kinase 2等与性别分化和性腺发育相关的基因,以及热休克蛋白家族、泛素系统、抗氧化防御体系和抗病相关的功能基因。该文库具有较高的质量和利用价值,可为更大规模EST分析及采用基因芯片技术开展锯缘青蟹性腺发育及性别分化相关功能基因的研究奠定基础。展开更多
植物在逆境胁迫下大量基因的表达往往会发生改变,最终导致对逆境的诱导抗性。剖析逆境作用下差异表达基因的功能是阐明植物抗逆分子机制的重要途径,而获得逆境作用下差异表达基因的全长cDNA是上述研究的基础。建立获得辣椒应答疫霉侵染...植物在逆境胁迫下大量基因的表达往往会发生改变,最终导致对逆境的诱导抗性。剖析逆境作用下差异表达基因的功能是阐明植物抗逆分子机制的重要途径,而获得逆境作用下差异表达基因的全长cDNA是上述研究的基础。建立获得辣椒应答疫霉侵染差异表达基因全长cDNA的技术平台:利用抑制性差减杂交技术构建辣椒叶片在疫霉侵染下的SSH文库,随机挑取150个克隆测序,获得24个功能已知的序列,BLASTN分析发现这些差异表达基因从功能上可分为能量代谢过程、信号传递、光合作用、抗逆反应等几种类型;利用DSN(duplex-specific nuclease)均一化技术与SMARTTM(switching mechanism at 5’end of RNA transcript)建库技术相结合的方法,构建了辣椒全长均一化cDNA文库,该文库含有1.8×106个独立克隆,插入片段平均长度为1.75kb,重组率为97%;基于SSH获得的差异表达基因序列设计特异性引物,从均一化文库中分离获得其相应的cDNA,结果表明:所获得的差异表达基因cDNA片段相对应的cDNA阳性克隆均为全长cDNA,所构建的SSH和均一化cDNA文库可较好地应用于辣椒应答疫霉等逆境差异表达基因全长cDNA的分离,为进一步开展差异表达基因的功能鉴定奠定基础。展开更多
为探讨锯缘青蟹(Scylla serrata)性腺发育的分子机制,本研究提取锯缘青蟹卵巢的总RNA,经oligotex试剂分离mRNA,利用SMART(Switch mechanisms at the 5 end of RNAtranscript)技术及双链特异核酸内切酶DSN(duplex-specific nuclease)的...为探讨锯缘青蟹(Scylla serrata)性腺发育的分子机制,本研究提取锯缘青蟹卵巢的总RNA,经oligotex试剂分离mRNA,利用SMART(Switch mechanisms at the 5 end of RNAtranscript)技术及双链特异核酸内切酶DSN(duplex-specific nuclease)的特性构建均一化cDNA文库。经检测文库约含有4.7×107重组子,扩增后的文库含有1011以上重组子。从文库中随机挑取24个克隆进行PCR检测,文库的插入cDNA长度为500bp-2.5kb,重组率为95.8%。该文库的成功构建,为采用基因芯片技术开展锯缘青蟹性腺发育相关功能基因的研究奠定了基础。展开更多
为了获得国家二级保护植物品种菰的功能基因信息,并克隆功能基因片段,研究以SMART(switching mechanism at 5 end of RNA transcript)方式合成菰全长cDNA,结合DSN(duplex-specific nuclease)均一化技术,构建菰叶片组织的均一化全长cDNA...为了获得国家二级保护植物品种菰的功能基因信息,并克隆功能基因片段,研究以SMART(switching mechanism at 5 end of RNA transcript)方式合成菰全长cDNA,结合DSN(duplex-specific nuclease)均一化技术,构建菰叶片组织的均一化全长cDNA文库。该cDNA文库库容量大,达到了3.6×10~6 PFU/m L,插入片段平均长度为1 000 bp,重组率为97.9%。均一化全长cDNA文库能有效富集低丰度表达基因,降低冗余率,适用于目的基因的筛选,以及后续的基因、蛋白互作分析。展开更多
基金Supported by the National Nature Science Foundation of China(31372088)the "Academic Backbone" Project of Northeast Agricultural University(15XG05)China Agriculture Research System(CARS-26-02)
文摘A specialized test of two-hybrid library type three-frame cDNA yeast for Muskmelon Fusarium oxysporum using the switching mechanism at the 5'end of RNA template(SMART)technology was constructed to screen for interaction protein genes for wilt disease and to further research the molecular mechanisms of Fusarium oxysporum pathogenesis to explain the interactions between plant and pathogen.A 500-bp cDNA was purified and extracted using SMART and LD-PCR technology to synthesize ds cDNA and was then homogenized and purified to remove the fragments.After processing,the ds cDNA was connected to three types of reading frame pGADT7-SfiI carriers,and the three connection products in E.coli Electrocell were used to build the primary cDNA library.The titer of three ORF cDNA primary library storage capacities was 2.6×10^6,1.8×10^6 and 3×10^6 cfu;the PCR identification of the ORF 1 and 2 gene recombination rate was 94%,the ORF 3 gene recombination rate was 100%,and the insert length distribution was 0.5-4.0 kb as a single band.To reach the quality requirements for library construction,three kinds of reading frame cDNA primary libraries were mixed and amplified,and the plasmid was transformed into the Y187 yeast strain.The titer of the Y187 yeast library was determined to be 3.5×107 cfu?mL-1,and the base of the yeast library was approximately 1 600 000 cfu.The results showed that the construction of muskmelon Fusarium-specific two-hybrid library type three-frame cDNA yeast had a higher reservoir capacity and recombination rate and met the yeast two-hybrid screening requirements.
文摘以短季棉中棉所36(CCRI 36)顶端分生组织和花蕾为材料,以DSN(duplex-specific nuclease)均一化技术与SMART(switching mechanism at 5′end of RNAtranscript)建库技术相结合,构建CCRI 36花发育期均一化全长cDNA文库。经检测原始文库滴度为1.7×106cfumL-1。随机挑取100个克隆,利用PCR方法测得文库重组率达100%,插入片段平均长度为1.2kb。以两个高丰度表达基因Histon3和UBQ7为探针,进行虚拟Northern blot检测显示,其丰度在均一化cDNA中均明显降低,说明均一化效果显著,为节约筛库成本和EST有效测序奠定了基础;同时,利用常规PCR扩增技术从cDNA文库中筛选阳性信号,获得了花发育相关蛋白基因。初步证实CCRI36花发育期均一化全长cDNA文库构建成功,为深入研究棉花花发育机理及发掘与早熟相关的功能基因奠定了基础。
文摘植物在逆境胁迫下大量基因的表达往往会发生改变,最终导致对逆境的诱导抗性。剖析逆境作用下差异表达基因的功能是阐明植物抗逆分子机制的重要途径,而获得逆境作用下差异表达基因的全长cDNA是上述研究的基础。建立获得辣椒应答疫霉侵染差异表达基因全长cDNA的技术平台:利用抑制性差减杂交技术构建辣椒叶片在疫霉侵染下的SSH文库,随机挑取150个克隆测序,获得24个功能已知的序列,BLASTN分析发现这些差异表达基因从功能上可分为能量代谢过程、信号传递、光合作用、抗逆反应等几种类型;利用DSN(duplex-specific nuclease)均一化技术与SMARTTM(switching mechanism at 5’end of RNA transcript)建库技术相结合的方法,构建了辣椒全长均一化cDNA文库,该文库含有1.8×106个独立克隆,插入片段平均长度为1.75kb,重组率为97%;基于SSH获得的差异表达基因序列设计特异性引物,从均一化文库中分离获得其相应的cDNA,结果表明:所获得的差异表达基因cDNA片段相对应的cDNA阳性克隆均为全长cDNA,所构建的SSH和均一化cDNA文库可较好地应用于辣椒应答疫霉等逆境差异表达基因全长cDNA的分离,为进一步开展差异表达基因的功能鉴定奠定基础。
文摘为探讨锯缘青蟹(Scylla serrata)性腺发育的分子机制,本研究提取锯缘青蟹卵巢的总RNA,经oligotex试剂分离mRNA,利用SMART(Switch mechanisms at the 5 end of RNAtranscript)技术及双链特异核酸内切酶DSN(duplex-specific nuclease)的特性构建均一化cDNA文库。经检测文库约含有4.7×107重组子,扩增后的文库含有1011以上重组子。从文库中随机挑取24个克隆进行PCR检测,文库的插入cDNA长度为500bp-2.5kb,重组率为95.8%。该文库的成功构建,为采用基因芯片技术开展锯缘青蟹性腺发育相关功能基因的研究奠定了基础。
文摘为了获得国家二级保护植物品种菰的功能基因信息,并克隆功能基因片段,研究以SMART(switching mechanism at 5 end of RNA transcript)方式合成菰全长cDNA,结合DSN(duplex-specific nuclease)均一化技术,构建菰叶片组织的均一化全长cDNA文库。该cDNA文库库容量大,达到了3.6×10~6 PFU/m L,插入片段平均长度为1 000 bp,重组率为97.9%。均一化全长cDNA文库能有效富集低丰度表达基因,降低冗余率,适用于目的基因的筛选,以及后续的基因、蛋白互作分析。
