目的构建千里光全长cDNA文库,以期研究千里光的功能基因组学信息,为克隆药理学性状相关的功能基因提供数据资源。方法 Trizol法提取千里光叶片总RNA,通过SMART(switching mechanism at 5’end of RNA transcript)构建全长cDNA文库,随机...目的构建千里光全长cDNA文库,以期研究千里光的功能基因组学信息,为克隆药理学性状相关的功能基因提供数据资源。方法 Trizol法提取千里光叶片总RNA,通过SMART(switching mechanism at 5’end of RNA transcript)构建全长cDNA文库,随机挑取600个单克隆测序分析文库滴度、全长率及冗余率,得到的EST序列进行Blast分析(NR、NT、Swiss-Prot、KEGG)及COG功能分类。结果文库的库容为4.3×106cfu/mL,插入片段大小平均1.7 kb,文库重组率96.35%,全长率58.24%,冗余率10.88%;获得524条全长EST序列,含有467条独立基因(unigenes),其中5条序列与千里光次生代谢产物的合成、运输与代谢有关。结论经检测,SMART技术成功构建了千里光全长cDNA文库,该文库可用于千里光功能基因组鉴定、新基因筛选及次生代谢产物生物合成的表达调控研究。展开更多
Sesame （Sesamue indicum L.） is one of the most important oilseed crops with high oil yield. Here, we described a simple and efficient method for constructing a normalized cDNA library from a high oil content cultiva...Sesame （Sesamue indicum L.） is one of the most important oilseed crops with high oil yield. Here, we described a simple and efficient method for constructing a normalized cDNA library from a high oil content cultivar of sesame Zhongzhi 14, during its oil accumulation stages. It combined switching mechanism at 5？end of RNA transcript （SMART） technique and duplex-specific nuclease （DSN） normalization methods. Double-stranded cDNAs were synthesized from mRNAs, processed by normalization and Sfi I restriction endonuclease, and finally the cDNAs were ligated to pDNR-LIB vector. The ligation mixture was transformed into Escherichia coli DH10B by electroporation. The capacity of the library was 1.0？06 clones in this library. Gel electrophoresis results indicated the fragments ranged from 700 to 2 000 bp, with the average size of 1 800 bp. Random picking clones showed that the recombination rate was 100%. The results showed that the cDNA library constructed successfully was a full-length library with high quality, and could be used to screen the genes related to development of oil synthesis.展开更多
为研究凡纳滨对虾适应低温的分子机理,实验对从低温处理凡纳滨对虾抑制性消减文库中筛选出的一个360 bp EST序列进行了研究。首先,同源比对显示该EST片段与其他物种的ANT2基因高度同源,命名为凡纳滨对虾ANT2基因(LVANT2);其次,通过构建...为研究凡纳滨对虾适应低温的分子机理,实验对从低温处理凡纳滨对虾抑制性消减文库中筛选出的一个360 bp EST序列进行了研究。首先,同源比对显示该EST片段与其他物种的ANT2基因高度同源,命名为凡纳滨对虾ANT2基因(LVANT2);其次,通过构建凡纳滨对虾肝胰腺全长cDNA文库,PCR扩增获得LVANT2基因的全长cDNA1540 bp,其中包括1011 bp的完整开放阅读框,编码336个氨基酸残基。然后,对基因进行了不同组织和低温处理的表达谱分析:(1)组织表达谱的结果显示,该基因在凡纳滨对虾肌肉组织中表达量最高;(2)在不同低温处理下的表达结果显示,该基因在15℃处理下基因表达量发生显著变化,13℃开始呈下调表达,11℃时表达量又升高;13℃低温处理不同时间发现该基因在12h内表达量发生显著变化,48h后表达量最高。LVANT2基因的低温诱导表达模式说明其可能在凡纳滨对虾低温适应中发挥作用。展开更多
文摘目的构建千里光全长cDNA文库,以期研究千里光的功能基因组学信息,为克隆药理学性状相关的功能基因提供数据资源。方法 Trizol法提取千里光叶片总RNA,通过SMART(switching mechanism at 5’end of RNA transcript)构建全长cDNA文库,随机挑取600个单克隆测序分析文库滴度、全长率及冗余率,得到的EST序列进行Blast分析(NR、NT、Swiss-Prot、KEGG)及COG功能分类。结果文库的库容为4.3×106cfu/mL,插入片段大小平均1.7 kb,文库重组率96.35%,全长率58.24%,冗余率10.88%;获得524条全长EST序列,含有467条独立基因(unigenes),其中5条序列与千里光次生代谢产物的合成、运输与代谢有关。结论经检测,SMART技术成功构建了千里光全长cDNA文库,该文库可用于千里光功能基因组鉴定、新基因筛选及次生代谢产物生物合成的表达调控研究。
基金supported by the National Basic Research Program of China (2011cb109305)the Genetically Modified Organisms Breeding Major Projects, China (2009zx08004-002B)+1 种基金the Open Project Program of Key Laboratory for Oil Crops Biology, the Ministry of Agriculture, China (200703)the Foundation of Oil Crops Research Institute, Chinese Academy of Agricultural Sciences
文摘Sesame （Sesamue indicum L.） is one of the most important oilseed crops with high oil yield. Here, we described a simple and efficient method for constructing a normalized cDNA library from a high oil content cultivar of sesame Zhongzhi 14, during its oil accumulation stages. It combined switching mechanism at 5？end of RNA transcript （SMART） technique and duplex-specific nuclease （DSN） normalization methods. Double-stranded cDNAs were synthesized from mRNAs, processed by normalization and Sfi I restriction endonuclease, and finally the cDNAs were ligated to pDNR-LIB vector. The ligation mixture was transformed into Escherichia coli DH10B by electroporation. The capacity of the library was 1.0？06 clones in this library. Gel electrophoresis results indicated the fragments ranged from 700 to 2 000 bp, with the average size of 1 800 bp. Random picking clones showed that the recombination rate was 100%. The results showed that the cDNA library constructed successfully was a full-length library with high quality, and could be used to screen the genes related to development of oil synthesis.
文摘为研究凡纳滨对虾适应低温的分子机理,实验对从低温处理凡纳滨对虾抑制性消减文库中筛选出的一个360 bp EST序列进行了研究。首先,同源比对显示该EST片段与其他物种的ANT2基因高度同源,命名为凡纳滨对虾ANT2基因(LVANT2);其次,通过构建凡纳滨对虾肝胰腺全长cDNA文库,PCR扩增获得LVANT2基因的全长cDNA1540 bp,其中包括1011 bp的完整开放阅读框,编码336个氨基酸残基。然后,对基因进行了不同组织和低温处理的表达谱分析:(1)组织表达谱的结果显示,该基因在凡纳滨对虾肌肉组织中表达量最高;(2)在不同低温处理下的表达结果显示,该基因在15℃处理下基因表达量发生显著变化,13℃开始呈下调表达,11℃时表达量又升高;13℃低温处理不同时间发现该基因在12h内表达量发生显著变化,48h后表达量最高。LVANT2基因的低温诱导表达模式说明其可能在凡纳滨对虾低温适应中发挥作用。
