DNA扩增的方法有许多种,其中cDNA末端快速扩增(rapid amplification of cDNA ends,RACE)因其操作简单、成功率相对较高、重复性好,被广泛应用于真核生物基因全长的克隆与分析。本文比较了市售的RACE试剂盒所采用的模板制备策略及改进的...DNA扩增的方法有许多种,其中cDNA末端快速扩增(rapid amplification of cDNA ends,RACE)因其操作简单、成功率相对较高、重复性好,被广泛应用于真核生物基因全长的克隆与分析。本文比较了市售的RACE试剂盒所采用的模板制备策略及改进的扩增方法。展开更多
采用快速扩增cDNA末端(rapid amplification of cDNA ends,RACE)的方法,分离和测定了牙鲆自然杀伤细胞增强因子(NKEF)cDNA的全长核苷酸序列,5'RACE扩增分离得到了400bp左右的片段,3'RACE扩增得到了800bp左右的片段,经过拼接得...采用快速扩增cDNA末端(rapid amplification of cDNA ends,RACE)的方法,分离和测定了牙鲆自然杀伤细胞增强因子(NKEF)cDNA的全长核苷酸序列,5'RACE扩增分离得到了400bp左右的片段,3'RACE扩增得到了800bp左右的片段,经过拼接得到了牙鲆NKEF全长cDNA序列.牙鲆NKEF cDNA全长1028bp(不包含polyA),其中包括67bp的5'非翻译区、597bp的开放阅读框和364bp的3'非翻译区(不包含polyA),整个开放阅读框编码198个氨基酸.RT-PCR分析表明,NKEF基因在牙鲆不同组织中普遍表达,但是表达水平存在着明显的差异.研究结果为提高牙鲆自身免疫防御能力的研究提供了理论依据.展开更多
利用RT-PCR和cDNA末端快速扩增技术(rapid amplification of cDNA ends,RACE)克隆了黄颡鱼DMRT1基因cDNA全长序列,并利用实时荧光定量RT-PCR技术对该基因在黄颡鱼成体不同组织及不同发育阶段的表达情况进行研究。结果表明,黄颡鱼DMRT1基...利用RT-PCR和cDNA末端快速扩增技术(rapid amplification of cDNA ends,RACE)克隆了黄颡鱼DMRT1基因cDNA全长序列,并利用实时荧光定量RT-PCR技术对该基因在黄颡鱼成体不同组织及不同发育阶段的表达情况进行研究。结果表明,黄颡鱼DMRT1基因cDNA序列全长1 381bp,其中5′端非翻译区30bp,3′端非翻译区454bp[不包括poly(A)],开放阅读框885bp,编码295个氨基酸。氨基酸序列同源性分析表明,黄颡鱼DMRT1基因与革胡子鲶同源性最高(为81%),与黑鲷、虹鳟、斑马鱼、青鳉的同源性分别为60%、59%、64%和52%,与小鼠、人的同源性较低,分别为42%和44%。实时荧光定量RT-PCR分析表明:DMRT1基因在黄颡鱼胚胎发育阶段及胚后发育的1～51d仔鱼均有表达,且在胚后发育的第31天表达量最高;在成体,只在雄性精巢中特异性表达,其他组织均无表达,且性腺发育阶段的Ⅳ期精巢表达量最高,表明该基因可能在黄颡鱼雄性性腺的形成或功能维持上具有重要作用。展开更多
在植物系统获得性抗性(SAR)中,NPR1蛋白是水杨酸介导的基因表达中关键调控因子。本研究以青农2号为试验材料,利用同源序列法和RACE技术分离甘薯SAR途径的主要抗病信号元件NPR1(none expresser of PR gene)的全长cDNA序列。序列分析表明,...在植物系统获得性抗性(SAR)中,NPR1蛋白是水杨酸介导的基因表达中关键调控因子。本研究以青农2号为试验材料,利用同源序列法和RACE技术分离甘薯SAR途径的主要抗病信号元件NPR1(none expresser of PR gene)的全长cDNA序列。序列分析表明,IbNPR1基因全长2353bp,包含一个编码586个氨基酸残基的开放阅读框,包含有类似拟南芥NPR1蛋白中的BTB/POZ和锚蛋白重复氨基酸序列结构域。聚类分析显示IbNPR1与来源于番茄的NPR1蛋白关系最近。Southern杂交及半定量RT-PCR分析表明,甘薯NPR1基因属于低拷贝基因家族,表达模式为组成型表达,并且SA能提高其表达水平。由该结果推测,IbNPR1可能在甘薯抵御病原物的侵染中起重要的作用。展开更多
The full length cDNA encoding growth hormone of a freshwater fish, Lepomis cyanellus, (LcGH) was cloned from pituitary RNA with RT-PCR, 3′and 5′ RACE (rapid amplification of cDNA ends). The LcGH cDNA (Genbank No. AY...The full length cDNA encoding growth hormone of a freshwater fish, Lepomis cyanellus, (LcGH) was cloned from pituitary RNA with RT-PCR, 3′and 5′ RACE (rapid amplification of cDNA ends). The LcGH cDNA (Genbank No. AY530822), about 989nt (nucleotide) long, consisted of a open reading frame with 615nt long, 5′and 3′untranslated regions with 93nt and 224nt long respectively, and a 57nt poly (A) tail. The DNA sequence analysis showed that there are typical Kozak sequence and polyadenylation signal. The pregrowth hormone peptide of 204aa deduced from LcGH cDNA included a putative signal peptide (17aa) locating in its N-terminal. There exist a Asn-Cys-Thr glycosylation site at amino acid 201, and 4 cysteine residues (No. 69, 177, 194, 202) that are essential to construct two S-S bonds in this pregrowth hormone peptide. Homological comparision among LcGH and other species growth hormones showed that There is high homology (more than 85%) between growth hormone of Lepomis cyanellus and that of most perciformes fish, but low homology (less than 70%) in comparison with other species such as Siluriformes and Cypriniformes fish.展开更多
基金supported by Natural Science Foundation of Fujian Province (2006J0059)National Natural Science Foundation of China (30900915)the foundation for young scholars in Fujian Agriculture and Forestry University (08B12)
文摘在植物系统获得性抗性(SAR)中,NPR1蛋白是水杨酸介导的基因表达中关键调控因子。本研究以青农2号为试验材料,利用同源序列法和RACE技术分离甘薯SAR途径的主要抗病信号元件NPR1(none expresser of PR gene)的全长cDNA序列。序列分析表明,IbNPR1基因全长2353bp,包含一个编码586个氨基酸残基的开放阅读框,包含有类似拟南芥NPR1蛋白中的BTB/POZ和锚蛋白重复氨基酸序列结构域。聚类分析显示IbNPR1与来源于番茄的NPR1蛋白关系最近。Southern杂交及半定量RT-PCR分析表明,甘薯NPR1基因属于低拷贝基因家族,表达模式为组成型表达,并且SA能提高其表达水平。由该结果推测,IbNPR1可能在甘薯抵御病原物的侵染中起重要的作用。
文摘The full length cDNA encoding growth hormone of a freshwater fish, Lepomis cyanellus, (LcGH) was cloned from pituitary RNA with RT-PCR, 3′and 5′ RACE (rapid amplification of cDNA ends). The LcGH cDNA (Genbank No. AY530822), about 989nt (nucleotide) long, consisted of a open reading frame with 615nt long, 5′and 3′untranslated regions with 93nt and 224nt long respectively, and a 57nt poly (A) tail. The DNA sequence analysis showed that there are typical Kozak sequence and polyadenylation signal. The pregrowth hormone peptide of 204aa deduced from LcGH cDNA included a putative signal peptide (17aa) locating in its N-terminal. There exist a Asn-Cys-Thr glycosylation site at amino acid 201, and 4 cysteine residues (No. 69, 177, 194, 202) that are essential to construct two S-S bonds in this pregrowth hormone peptide. Homological comparision among LcGH and other species growth hormones showed that There is high homology (more than 85%) between growth hormone of Lepomis cyanellus and that of most perciformes fish, but low homology (less than 70%) in comparison with other species such as Siluriformes and Cypriniformes fish.
