A rice CaMBP gene, OsCaMBP （AB363406）, was isolated from a chilling treated rice using the fluorescent differential display （FDD） screening method. Its cDNA sequence （2094 bp） contains an opening reading frame ...A rice CaMBP gene, OsCaMBP （AB363406）, was isolated from a chilling treated rice using the fluorescent differential display （FDD） screening method. Its cDNA sequence （2094 bp） contains an opening reading frame （ORF） encoding a 569 amino acids protein （63.2 kD）. OsCaMBP has the typical structural features of the CaMBP family, including the conserved IQ calmodulin-binding motif at the N-terminus. Homology analysis revealed 38.25%-47.28% identities of OsCaMBP with other CaMBPs in plants. RT-PCR analysis showed that the expression of OsCaMBP was remarkably inducible under the chilling （8℃） and heat-shock （42℃） treatments. OsCaMBP was undetectable under the normal conditions, and induced under the chilling treatment for 1 h, as well as the heat-shock treatment for 15 min, suggesting that the gene plays important roles in the signaling pathway in rice under both chilling and heat-shock stresses.展开更多
The callipyge （CLPG） phenotype, exhibiting polar overdominance （POD）, is an inherited skeletal muscle hypertrophy described in sheep. The callipyge locus maps to the distal portion of ovine chromosome 18 within th...The callipyge （CLPG） phenotype, exhibiting polar overdominance （POD）, is an inherited skeletal muscle hypertrophy described in sheep. The callipyge locus maps to the distal portion of ovine chromosome 18 within the DLKI-GTL2 region and corresponds to human chromosome 14 and mouse chromosome 12. The POD phenomenon is confirmed to the homologous region of swine chromosome 7. In order to clone and investigate the expression of porcine GTL2 gene, DNA and RNA samples from 60-day-old F1 animals, generated with reciprocal crosses between Large White and Meishan breeds and their parents, were used. The authors showed that porcine GTL2 acted as a uoncoding RNA. cDNA samples exhibited maternal expression of the gene in the heart, liver, spleen, lung, kidney, stomach, small intestine, skeletal muscle, and fat in pigs, and a unique tissue-specific expression different from that of humans and mice. These results indicated that the gene was conserved in the pig, human, mouse, and bovine. It will be of interest to further study the gene functions in muscle growth and fat deposition.展开更多
We cloned cDNAs for Xenopus aldolases A, B and C. These three aldolase genes are localized on different chromosomes as a single copy gene. In the adult, the aldolase A gene is expressed extensively in muscle tissues, ...We cloned cDNAs for Xenopus aldolases A, B and C. These three aldolase genes are localized on different chromosomes as a single copy gene. In the adult, the aldolase A gene is expressed extensively in muscle tissues, whereas the aldolase B gene is expressed strongly in kidney, liver, stomach and intestine, while the aldolase C gene is expressed in brain, heart and ovary. In oocytes aldolase A and C mRNAs, but not aldolase B mRNA, are extensively transcribed. Thus, aldolase A and C mRNAs, but not B mRNA, occur abundantly in eggs as maternal mRNAs, and strong expression of aldolase B mRNA is seen only after the late neurula stage. We conclude that aldolase A and C mRNAs are major aldolase mRNAs in early stages of Xenopus embryogenesis which proceeds utilizing yolk as the only energy source, aldolase B mRNA, on the other hand, is expressed only later in development in tissues which are required for dietary fructose metabolism.We also isolated the Xenopus aldolase C genomic gene (ca. 12 kb) and found that its promoter (ca. 2 kb)contains regions necessary for tissue-specific expression and also a GC rich region which is essential for basal transcriptional activity.展开更多
Establishing the hepatoma cell-specific expression of human interferon gene mediated by retroviral vectors. Methods: Human interferon-β complementary DNA (IFN-β cDNA) was inserted into polylinker site of pMNSM retro...Establishing the hepatoma cell-specific expression of human interferon gene mediated by retroviral vectors. Methods: Human interferon-β complementary DNA (IFN-β cDNA) was inserted into polylinker site of pMNSM retroviral vector to construct recombinant retroviral vector pMNSIFNB, where the transcription of IFN-β gene was driven by SV40 early region promoter, and MNAIFNB, where the transcription of IFN-β gene was driven by SV40 early region promoter regulated by α-fetoprotein enhancer. The retroviral constructs were respectively introduced into PA317 amphotropic packaging cells by means of lipofectamine mediated gene transfer procedure. The plasmids transfection efficiency was among (4-25)ｘ103 colonies/μg DNA/106 PA317 cells. The retrovirus infection efficiency was among (4. 5-500)ｘ104 Colony Forming Units (CFU)/ml. The recombinant retroviruses were used to infect human hepatoma cells, renal cell carcinoma cells and melanoma cell lines in the presence of 4 μg/ml polybrene. Results: Dot hybridization of total RNA from the neomycin resistant colonies and interferon expression assay indicated that human α-fetoprotein enhancer induced efficient and specific transcription and expression of IFN-β gene driven by the promoter of different origin in human hepatoma cells by which α-fetoprotein was highly produced. Conclusion: Cis-active element of α-fetoprotein gene can drive IFN-β gene specifically expressed in human hepatoma cells, which presents some valuable materials for the hepatoma-specific immune gene therapy.展开更多
Background Evidence for the importance of genetic factors in male infertility is accumulating This study was designed to identify a novel testis specific gene related to spermatogenesis by a new strategy of digital di...Background Evidence for the importance of genetic factors in male infertility is accumulating This study was designed to identify a novel testis specific gene related to spermatogenesis by a new strategy of digital differential display (DDD) Methods Based on the generation of expressed sequenced tags (ESTs), comparing the testis libraries with other tissue or cell line libraries by the DDD program, we identified a new contig of the ESTs which were derived from testis libraries and represented a novel gene Multi tissue RT PCR was performed to analyse its tissue specific expression The full length cDNA of the new gene was obtained using the BLAST program Sequencing was performed and the result was analysed Semi quantitative RT PCR and Northern blot analyseis of mRNA from differential normal tissues were performed to clarify the expression pattern of the new gene The sequence of the opening reading frame was integrated into the pQE 30 vector expressed in Escherichia coil strain M15(pREP4) With IPTG induction, the target protein was detected Results A full length cDNA sequence of the new gene named SPATA12 (GeneBank accession number AY221117) in human testis was identified SPATA12 was 2430 bp in length, located in chromosome 3p21 1 3p21 2 The sequence of the opening reading frame was 676-1248 bp, as was confirmed by RT PCR and sequencing The cDNA encodes a novel protein of 190 amino acids with a theoretical molecular weight of 20 417 8 and isoelectric point of 5 23 The sequence has no significant homology with any known protein in databases Semi quantitative RT PCR and Northern blot analyses of multiple tissues showed that SPATA12 was expressed significantly in normal human testis The expression recombinant of SPATA12 was constructed and a high level of the histidine tagged fusion protein was obtained Conclusions DDD can be confirmed by SPATA12 as a novel computational biology based approach for identification of the testis specific expression genes SPATA12 may function as a testicular germ cell associated gene that plays some roles in spermatogenesis Moreover, a great amount of SPATA12 protein could be obtained by the gene recombination technique, thus providing a reliable foundation for investigating the biological function of this new protein展开更多
PNZIP gene promoter has been cloned from Pharbitis nil by adaptor PCR, which con-forms to eukaryotic promoter characteristic. Primer extension analysis showed that the transcrip-tion start site was located 122 nucleot...PNZIP gene promoter has been cloned from Pharbitis nil by adaptor PCR, which con-forms to eukaryotic promoter characteristic. Primer extension analysis showed that the transcrip-tion start site was located 122 nucleotides upstream of the translation start site of PNZIP gene. According to the characteristic of PNZIP promoter, a series of deletions were purposely made by PCR. Five deletion fragments were fused to upstream of GUS gene and transferred into tobacco. Fluorometric GUS assay showed that five different length promoters all could specifically drive GUS gene expression in photosynthetic tissues and their activities decreased along with the gradual deletion of PNZIP promoter. In addition, the activity of full-length promoter was 9 times higher than that of CaMV 35S in leaf. PNZIP promoter may have two putative cis-elements, GAAATA and GATACT, which relate to gene expression in photosynthetic tissues. GATACT may determine the gene specific expression in photosynthetic tissues, while GAAATA, perhaps, as an enhancer, increases the intensity of gene expression.展开更多
Endogenous viruses integrate into the host genome and influence the expression of neighboring genes through their long terminal repeats (LTRs). In this study, we analyzed the promoter, enhancer and transcriptional act...Endogenous viruses integrate into the host genome and influence the expression of neighboring genes through their long terminal repeats (LTRs). In this study, we analyzed the promoter, enhancer and transcriptional activities of the chicken endogenous retrovirus ev21 LTR. The LTR was cloned into pGL3-basic and pGL3-promoter luciferase vectors in forward and reverse orientation separately. The luciferase activities were detected respectively in chicken embryonic fibroblast cell, human embryonic kidney cell line, human lung carcinoma cell line, Chinese hamster ovary cell line, and murine melanoma cell line. Relative luciferase activity analysis indicated that the ev21 LTR retained bi-directional promoter activity but no detectable enhancer activity in these cells. The constructs containing the LTR and F1 region show stronger promoter activity than the constructs containing only LTR. The transcriptional pattern of ev21 LTR varied in tissues of late feathering White Leghorn chicken at post-hatch day one. Skin exhibits the highest expression in the tissues examed. Collectively, our results indicate that the ev21 LTR exhibits tissue-type specific expression in White Leghorn chicken, and it also have regulatory potential.展开更多
Two different length fragments, RSF1 and RSF2 which contained the cis-acting sequences of root-specific gene TobRB7, were isolated from tobacco genome. The abilities of these fragments to direct root-specific expressi...Two different length fragments, RSF1 and RSF2 which contained the cis-acting sequences of root-specific gene TobRB7, were isolated from tobacco genome. The abilities of these fragments to direct root-specific expression were studied by fusing them to the β-glucuronidase (GUS) report gene with different directions. After the recombined vectors were transformed into tobacco, the expression pattern was performed by histochemical staining and the quantitative analysis of GUS activity. The data suggested that the cis-acting element of TobRB7 gene direct GUS expression not only as root-specific but also as bidirectional. In our studies, the short fragment, RSF2, performed stronger activity than RSF1 with any direction. The stronger activity of GUS expression was determined by reverse inserting of RSF1 or RSF2 than positive inserting.展开更多
植物细胞受体类蛋白是一类重要的结构蛋白,在环境信号感知及细胞间信息传递中起重要作用。本研究克隆了三叶青(Tetrastigma hemsleyanum Diels et Gilg)的两个受体蛋白基因ThRLP1与ThRLK1,并对其进行了生物信息学分析、器官特异性表达...植物细胞受体类蛋白是一类重要的结构蛋白,在环境信号感知及细胞间信息传递中起重要作用。本研究克隆了三叶青(Tetrastigma hemsleyanum Diels et Gilg)的两个受体蛋白基因ThRLP1与ThRLK1,并对其进行了生物信息学分析、器官特异性表达分析和在块根发育不同时期的表达分析,以明确两基因与三叶青芽发育和块根形成的相关性。生物信息学分析表明,所克隆的两个基因中一个为细胞外受体类蛋白基因(ThR-LP1),其氨基酸序列具有特征的亮氨酸重复序列,亚细胞定位推测在细胞壁;另一个为质膜受体类蛋白激酶基因(ThRLK1),推测氨基酸序列中具有特征的丝氨酸/苏氨酸激酶的催化结构域,亚细胞定位推测在细胞核。器官特异性表达分析发现ThRLP1在块根中的表达量显著低于其他器官,ThRLK1在块根中的表达量显著低于枝蔓但高于其他器官,两个基因的表达水平并没有显示出与芽发育有相关性;块根发育不同时期表达量分析表明,ThRLP1在块根初始膨大期的表达量显著低于其他时期,ThRLK1表达量随块根发育进程而提高,ThR-LK1基因的表达与块根发育进程呈现出一定的正相关性。所克隆的两个受体蛋白可通过大肠杆菌原核表达体系正确表达出相应蛋白。本研究可为进一步明确受体类蛋白激酶基因在三叶青块根发育分子网络中的功能提供初步的参考依据。展开更多
基金supported by the Program for Changjiang Scholars and Innovative Research Team in University of China (Grant No. IRT0453)the National Science & Technology Pillar Program of China in the Eleventh Five-Year Plan Period (Grant No. 2007BAD81B00).
文摘A rice CaMBP gene, OsCaMBP （AB363406）, was isolated from a chilling treated rice using the fluorescent differential display （FDD） screening method. Its cDNA sequence （2094 bp） contains an opening reading frame （ORF） encoding a 569 amino acids protein （63.2 kD）. OsCaMBP has the typical structural features of the CaMBP family, including the conserved IQ calmodulin-binding motif at the N-terminus. Homology analysis revealed 38.25%-47.28% identities of OsCaMBP with other CaMBPs in plants. RT-PCR analysis showed that the expression of OsCaMBP was remarkably inducible under the chilling （8℃） and heat-shock （42℃） treatments. OsCaMBP was undetectable under the normal conditions, and induced under the chilling treatment for 1 h, as well as the heat-shock treatment for 15 min, suggesting that the gene plays important roles in the signaling pathway in rice under both chilling and heat-shock stresses.
基金supported by theNational Natural Science Foundation of China(30571331).
文摘The callipyge （CLPG） phenotype, exhibiting polar overdominance （POD）, is an inherited skeletal muscle hypertrophy described in sheep. The callipyge locus maps to the distal portion of ovine chromosome 18 within the DLKI-GTL2 region and corresponds to human chromosome 14 and mouse chromosome 12. The POD phenomenon is confirmed to the homologous region of swine chromosome 7. In order to clone and investigate the expression of porcine GTL2 gene, DNA and RNA samples from 60-day-old F1 animals, generated with reciprocal crosses between Large White and Meishan breeds and their parents, were used. The authors showed that porcine GTL2 acted as a uoncoding RNA. cDNA samples exhibited maternal expression of the gene in the heart, liver, spleen, lung, kidney, stomach, small intestine, skeletal muscle, and fat in pigs, and a unique tissue-specific expression different from that of humans and mice. These results indicated that the gene was conserved in the pig, human, mouse, and bovine. It will be of interest to further study the gene functions in muscle growth and fat deposition.
文摘We cloned cDNAs for Xenopus aldolases A, B and C. These three aldolase genes are localized on different chromosomes as a single copy gene. In the adult, the aldolase A gene is expressed extensively in muscle tissues, whereas the aldolase B gene is expressed strongly in kidney, liver, stomach and intestine, while the aldolase C gene is expressed in brain, heart and ovary. In oocytes aldolase A and C mRNAs, but not aldolase B mRNA, are extensively transcribed. Thus, aldolase A and C mRNAs, but not B mRNA, occur abundantly in eggs as maternal mRNAs, and strong expression of aldolase B mRNA is seen only after the late neurula stage. We conclude that aldolase A and C mRNAs are major aldolase mRNAs in early stages of Xenopus embryogenesis which proceeds utilizing yolk as the only energy source, aldolase B mRNA, on the other hand, is expressed only later in development in tissues which are required for dietary fructose metabolism.We also isolated the Xenopus aldolase C genomic gene (ca. 12 kb) and found that its promoter (ca. 2 kb)contains regions necessary for tissue-specific expression and also a GC rich region which is essential for basal transcriptional activity.
文摘Establishing the hepatoma cell-specific expression of human interferon gene mediated by retroviral vectors. Methods: Human interferon-β complementary DNA (IFN-β cDNA) was inserted into polylinker site of pMNSM retroviral vector to construct recombinant retroviral vector pMNSIFNB, where the transcription of IFN-β gene was driven by SV40 early region promoter, and MNAIFNB, where the transcription of IFN-β gene was driven by SV40 early region promoter regulated by α-fetoprotein enhancer. The retroviral constructs were respectively introduced into PA317 amphotropic packaging cells by means of lipofectamine mediated gene transfer procedure. The plasmids transfection efficiency was among (4-25)ｘ103 colonies/μg DNA/106 PA317 cells. The retrovirus infection efficiency was among (4. 5-500)ｘ104 Colony Forming Units (CFU)/ml. The recombinant retroviruses were used to infect human hepatoma cells, renal cell carcinoma cells and melanoma cell lines in the presence of 4 μg/ml polybrene. Results: Dot hybridization of total RNA from the neomycin resistant colonies and interferon expression assay indicated that human α-fetoprotein enhancer induced efficient and specific transcription and expression of IFN-β gene driven by the promoter of different origin in human hepatoma cells by which α-fetoprotein was highly produced. Conclusion: Cis-active element of α-fetoprotein gene can drive IFN-β gene specifically expressed in human hepatoma cells, which presents some valuable materials for the hepatoma-specific immune gene therapy.
文摘Background Evidence for the importance of genetic factors in male infertility is accumulating This study was designed to identify a novel testis specific gene related to spermatogenesis by a new strategy of digital differential display (DDD) Methods Based on the generation of expressed sequenced tags (ESTs), comparing the testis libraries with other tissue or cell line libraries by the DDD program, we identified a new contig of the ESTs which were derived from testis libraries and represented a novel gene Multi tissue RT PCR was performed to analyse its tissue specific expression The full length cDNA of the new gene was obtained using the BLAST program Sequencing was performed and the result was analysed Semi quantitative RT PCR and Northern blot analyseis of mRNA from differential normal tissues were performed to clarify the expression pattern of the new gene The sequence of the opening reading frame was integrated into the pQE 30 vector expressed in Escherichia coil strain M15(pREP4) With IPTG induction, the target protein was detected Results A full length cDNA sequence of the new gene named SPATA12 (GeneBank accession number AY221117) in human testis was identified SPATA12 was 2430 bp in length, located in chromosome 3p21 1 3p21 2 The sequence of the opening reading frame was 676-1248 bp, as was confirmed by RT PCR and sequencing The cDNA encodes a novel protein of 190 amino acids with a theoretical molecular weight of 20 417 8 and isoelectric point of 5 23 The sequence has no significant homology with any known protein in databases Semi quantitative RT PCR and Northern blot analyses of multiple tissues showed that SPATA12 was expressed significantly in normal human testis The expression recombinant of SPATA12 was constructed and a high level of the histidine tagged fusion protein was obtained Conclusions DDD can be confirmed by SPATA12 as a novel computational biology based approach for identification of the testis specific expression genes SPATA12 may function as a testicular germ cell associated gene that plays some roles in spermatogenesis Moreover, a great amount of SPATA12 protein could be obtained by the gene recombination technique, thus providing a reliable foundation for investigating the biological function of this new protein
基金supported by the National Natural Science Foundation of China(Grant No.30270145)the“863”Projects(Grant No.2002AA224101)the National Special Program for Research and Industrialization of Transgenic Plants(Grant No.J99-A-038)in China.
文摘PNZIP gene promoter has been cloned from Pharbitis nil by adaptor PCR, which con-forms to eukaryotic promoter characteristic. Primer extension analysis showed that the transcrip-tion start site was located 122 nucleotides upstream of the translation start site of PNZIP gene. According to the characteristic of PNZIP promoter, a series of deletions were purposely made by PCR. Five deletion fragments were fused to upstream of GUS gene and transferred into tobacco. Fluorometric GUS assay showed that five different length promoters all could specifically drive GUS gene expression in photosynthetic tissues and their activities decreased along with the gradual deletion of PNZIP promoter. In addition, the activity of full-length promoter was 9 times higher than that of CaMV 35S in leaf. PNZIP promoter may have two putative cis-elements, GAAATA and GATACT, which relate to gene expression in photosynthetic tissues. GATACT may determine the gene specific expression in photosynthetic tissues, while GAAATA, perhaps, as an enhancer, increases the intensity of gene expression.
基金Supported by the National Basic Research Program of China (Grant No. G20000161)National Natural Science Foundation of China (Grant No. 3022804)
文摘Endogenous viruses integrate into the host genome and influence the expression of neighboring genes through their long terminal repeats (LTRs). In this study, we analyzed the promoter, enhancer and transcriptional activities of the chicken endogenous retrovirus ev21 LTR. The LTR was cloned into pGL3-basic and pGL3-promoter luciferase vectors in forward and reverse orientation separately. The luciferase activities were detected respectively in chicken embryonic fibroblast cell, human embryonic kidney cell line, human lung carcinoma cell line, Chinese hamster ovary cell line, and murine melanoma cell line. Relative luciferase activity analysis indicated that the ev21 LTR retained bi-directional promoter activity but no detectable enhancer activity in these cells. The constructs containing the LTR and F1 region show stronger promoter activity than the constructs containing only LTR. The transcriptional pattern of ev21 LTR varied in tissues of late feathering White Leghorn chicken at post-hatch day one. Skin exhibits the highest expression in the tissues examed. Collectively, our results indicate that the ev21 LTR exhibits tissue-type specific expression in White Leghorn chicken, and it also have regulatory potential.
文摘Two different length fragments, RSF1 and RSF2 which contained the cis-acting sequences of root-specific gene TobRB7, were isolated from tobacco genome. The abilities of these fragments to direct root-specific expression were studied by fusing them to the β-glucuronidase (GUS) report gene with different directions. After the recombined vectors were transformed into tobacco, the expression pattern was performed by histochemical staining and the quantitative analysis of GUS activity. The data suggested that the cis-acting element of TobRB7 gene direct GUS expression not only as root-specific but also as bidirectional. In our studies, the short fragment, RSF2, performed stronger activity than RSF1 with any direction. The stronger activity of GUS expression was determined by reverse inserting of RSF1 or RSF2 than positive inserting.
文摘植物细胞受体类蛋白是一类重要的结构蛋白,在环境信号感知及细胞间信息传递中起重要作用。本研究克隆了三叶青(Tetrastigma hemsleyanum Diels et Gilg)的两个受体蛋白基因ThRLP1与ThRLK1,并对其进行了生物信息学分析、器官特异性表达分析和在块根发育不同时期的表达分析,以明确两基因与三叶青芽发育和块根形成的相关性。生物信息学分析表明,所克隆的两个基因中一个为细胞外受体类蛋白基因(ThR-LP1),其氨基酸序列具有特征的亮氨酸重复序列,亚细胞定位推测在细胞壁;另一个为质膜受体类蛋白激酶基因(ThRLK1),推测氨基酸序列中具有特征的丝氨酸/苏氨酸激酶的催化结构域,亚细胞定位推测在细胞核。器官特异性表达分析发现ThRLP1在块根中的表达量显著低于其他器官,ThRLK1在块根中的表达量显著低于枝蔓但高于其他器官,两个基因的表达水平并没有显示出与芽发育有相关性;块根发育不同时期表达量分析表明,ThRLP1在块根初始膨大期的表达量显著低于其他时期,ThRLK1表达量随块根发育进程而提高,ThR-LK1基因的表达与块根发育进程呈现出一定的正相关性。所克隆的两个受体蛋白可通过大肠杆菌原核表达体系正确表达出相应蛋白。本研究可为进一步明确受体类蛋白激酶基因在三叶青块根发育分子网络中的功能提供初步的参考依据。
