37 results about "Transcription Repression" patented technology

The invention discloses a construction method and application of a high-yield L-threonine gene engineering bacterium and belongs to the technical field of gene engineering and microbial fermentation.By means of deletion of an arcA gene encoding a transcription regulatory factor, deletion of an iclR gene encoding transcription repression and deletion of a tdcC gene encoding a threonine transporter, the yield of L-threonine is greatly improved, the yield of L-threonine is increased to 20.1 g/L after 36 hours of fermentation, and the conversion rate reaches 0.67.

This invention relates to inhibition of hepatitis gene expression. More specifically, the invention relates to a method of using RNA sequences to inhibit Hepatitis B and C Virus replication. Expression cassettes that include DNA sequences derived from endogenous micro RNAs (miRs) are used in the method and are transcribed by Pol Il promoters, and then processed to generate sequences that are specific to target hepatitis virus sequences (RNAi effecter sequences). The RNAi effecter sequences can target the selected hepatitis virus sequences resulting in gene silencing or transcriptional inhibition of the hepatitis virus gene. The expression cassettes may be delivered in vitro or in vivo to host cells. A pharmaceutical composition containing the expression cassettes is also claimed.

The present invention relates to the identification of the genomic promoter region of the human and mouse telomerase RNA gene. Telomerase activity is necessary for the unrestricted proliferative capacity of many human cancers. It is proposed that mutation or dysregulation of the telomerase repression pathway may cause reactivation or upregulation of telomerase expression in cancer. The invention provides details of elements important for the regulation of telomerase RNA genes, including the Sp family of transcription factors. There is further provided methods for screening elements having the ability for suppressing telomerase RNA gene promoter activity and use of such elements in the treatment of cancers. In addition, evidence is also provided for the development of new transcription based therapies for cancer and for genetic approaches to targeting therapeutic genes to cancer cells. Namely, (1) transcriptional repression and the disruption of signal transduction pathways regulating telomerase activation. (2) Tumour specific gene expression for genetic therapy via telomerase RNA gene promoters.

The invention discloses an aptazyme modified sgRNA carrier with theophylline regulated expression. Aptazyme P1-F5 is inserted to tetraloop and stem loop 2 positions of an expressed sgRNA-AZ 2.0 skeleton; by means of Kpn I and EcoR I sites, and EcoR I and Spe I sites, a U6 promoter and the sgRNA-AZ 2.0 skeleton are connected into the carrier pUC19/EKSHL in order to obtain the carrier pU6-sgRNA-AZ 2.0; using Bsa I for enzyme digestion of the carrier pU6-sgRNA-AZ 2.0, and using cohesive end design and connecting an sgRNA sequence directing at the target gene so as to obtain the pU6-sgRNA-AZ 2.0-target site. The carrier can effectively mediate the genome editing function of Cas9 protein, and bring the editing activity under regulation of theophylline, also can mediate the transcription inhibition of dCas9-KRAB protein to the target gene, and enables regulation of inhibitory activity by theophylline.

The present invention provides methods for discovering agents that are effective in reversing epigenetic silencing by inhibiting the interaction of methyl-binding (MBD) proteins with methylated genomic DNA. Also provided are methods for reactivating silenced genes having CpG island hypermethylation along with methods for treatment and prevention of diseases, such as cancer and sickle cell anemia, by administering an agent that modulates methyl-binding domain (MBD) protein-mediated transcriptional repression, thereby increasing gene transcription to prevent or treat disease. Additionally, compounds identified by the present invention useful for treatment and prevention of diseases, such as cancer and sickle cell anemia, are provided.

The invention relates to fusion proteins capable of acting as transcriptional repressors of cytokinin signaling, to polynucleotides encoding these fusion proteins, to vectors and cells comprising these polynucleotides, and to transgenic plants and parts thereof comprising these polynucleotides, vectors, and cells.

The invention further relates to a process for making these transgenic plants and to the use of these transgenic plants for producing seeds of enhanced size, with enhanced seed filling, with reduced seed loss and/or with more rapid germination, and/or for producing a live root system with increased root mass, root length and/or root branching. The invention also relates to a method for enhancing the seed size, for enhancing seed filling, for reducing seed loss, and/or for reducing germination time and/or reproduction time, and/or for enhancing the root mass, root length and/or root branching of a plant and to seeds obtainable by the methods of the present invention.

The invention discloses a genetically engineered bacterium for producing L-threonine as well as a construction method and application of the genetically engineered bacterium. The biotin synthesis of the L-threonine producing strain is enhanced, especially the pyc gene of the strain is enhanced, and the adopted specific means is to enhance the bioABFCD gene (including promoter enhancement, RBS sequence enhancement and multi-copy), release the transcription repression of the brA gene, and release the transcription repression of the brA while enhancing the bioABFCD. According to the constructed genetically engineered bacterium for producing the L-threonine, through fermentation culture, the yield of the L-threonine can reach 20.2 g/L, and the conversion rate of saccharic acid can reach 23.8%.

The invention relates to discovery of a transcription factor family gene specific to angiosperms, detection on transcription inhibition activity of an encoding protein, and application of the transcription factor family gene in improving plant stress resistance. An experiment on AITRs (ABA-induced transcription repressors) gene knocked-out arabidopsis mutant is utilized to verify enhanced resistance of the mutant to ABA and an abiotic stress. AITRs are further discovered to be widely present in the angiosperms. Based on experiments taking tomatoes and soybeans as examples, expression of AITRs gene of the tomatoes is induced by the ABA, and a protoplast transfection experiment proves that the AITRs of both the tomatoes and the soybeans are transcription inhibitors, which indicates that the AITRs are a novel transcription factor family conserved in the angiosperms, and knocking out corresponding AITRs gene of a plant can enhance resistance of the plant to the abiotic stress. Therefore, the invention provides a transcription factor gene family which can be applied to genetic modification to enhance resistance of the plant to adverse environment.

Method of increasing protein content in a eukaryotic cell comprising an NF-YC4 gene comprising modifying the transcriptional repressor binding site; method of producing a plant with increased proteincontent comprising crossing and selecting for increased protein content; method of increasing resistance to a pathogen or a pest in a plant comprising an NF-YC4 gene comprising modifying the transcriptional repressor binding site, alone or in further combination with expressing QQS in the plant; method for producing a plant with increased resistance to a pathogen or a pest comprising crossing andselecting for increased resistance to the pathogen or the pest; a cell, collection of cells, tissue, organ, or organism in which the NF-YC4 gene comprises a promoter comprising a transcriptional repressor binding site that has been modified so that the transcriptional repressor cannot prevent transcription of the NF-YC4; hybrid plants; and seeds.

The invention discloses a conditionally replicating adenovirus vector for virus replication regulated by a TetR-KRAB-mediated transcription inhibition type Tet-On system, adenovirus E1 region comprises the following components in the following connection sequence: 5'-CMV promoter, TetR-KRAB gene, promoter TRE3G-E1b Pro containing a tetracycline responsive element, EcoR I enzyme cutting site, E1B Delta 55KD protein-deleted adenovirus E1A-E1B19KD gene sequence, enzyme cutting site Spe I and mRNA transcription termination signal SV40polyA-3'; the CMV promoter expresses transcription inhibitor TetR-KRAB; a gene sequence inserted into the two enzyme cutting sites of the EcoR I and the Spe I is a gene fragment from adenovirus E1A translation initiation site to adenovirus E1B19KD protein termination codon, the promoter TRE3G-E1b Pro containing the tetracycline responsive element expresses adenovirus E1A gene, adenovirus E1B19KD gene is expressed by the own promoter of the adenovirus E1B19KD, and the packed adenovirus is named as Ad5-CMV-TetR-KRAB-TRE3G-E1bPro-Delta 55KD. Tests show that the virus can be loaded into mesenchymal stem cells for application in study of tumor therapy.

The invention discloses an optically controlled gene transcription inhibition system and method, and a construction method for the optically controlled gene transcription inhibition system. A CRISPR (Clustered regularly interspaced short palindromic repeats) system is mainly used to design genes which are targeted by different sgRNAs (small guide Ribonucleic Acid) and have different purposes. An optically controlled transcription inhibition system is introduced, blue light dependence responsive proteins cibl and cry2 mutually act under different illumination conditions to drive HDAC (histone deacetylase) to indirectly act on a target gene, the HDAC is combined to a target gene site, histone is subjected to deacetylation, and gene transcription is inhibited so as to realize optically controlled gene transcription inhibition. A "CRISPR gene targeting-optogenetic gene regulation and control" technology is used for realizing the accurate targeting of a VEGF (vascular endothelial growth factor) and a receptor gene. Meanwhile, an optogenetic regulation and control technology is used for realizing the dynamic real-time controllable regulation of the VEGF and a receptor molecule accordingto individual differences.

It is found out in the invention that the poly-comb protein NSPc1 of the neural system can highly express in the tumor cell lines from a variety source of neural system using the Western blot technique, it is also found out that the expression level of NSPc1 in human gliocytoma sample is far higher than that in the normal tissue around the cancer and it goes up as the grading increase of the neurogliocytoma pathology using the Real-time PCR technique. NSPc1 is found to have transcription inhibition capacity using the fluorescence detection of reporting gene technology, and p21Waf1/Cip1 is found to be the target controlled gene of NSPc1. Promoter sequence mutation experiments and chromatin co-immunoprecipitation experiments of P21Waf1/Cip1 showed that the inhibition effect of NSPc1 on the transcription of p21Waf1/Cip1 depends on retinoic acid response elements (RARE). Overexpressions of retinoic acid receptor RXRalphacan eliminate the inhibition activity of NSPc1 on p21Waf1/Cip1 promoter. These results indicate that NSPc1 highly expressing in nerve tumor inhibits the transcription of p21Waf1/Cip1 through interfering the controlling access of the retinoic acid thus affects the differentiation of the nervous system tumor. Therefore, not only can NSPc1 be used as candidate markers for grouping diagnostic of nervous system malignant tumor type, but also can serve as a target of gene therapy. Meanwhile, in the invention, building the plasmid for prokaryotic expressing of full-length protein of NSPc1, transforming Escherichia coli to express the corresponding protein; After purifying the protein it can be used for the preparation of high-quality antibodies, as well as applied to the nervous system tumor diagnosis.

The invention provides a D-psicose biosensor which can be used for detecting the content of D-psicose in vivo and in vitro of microorganisms, and belongs to the field of synthetic biology and biochemical engineering. The biosensor takes escherichia coli as a chassis, and consists of a constitutive promoter, a transcription factor PsiR, an inducible promoter and a reporter gene egfp. Wherein the constitutive promoter is used for controlling expression of a transcription factor PsiR, and the inducible promoter is used for controlling expression of a reporter gene egfp. When the D-psicose does not exist, the PsiR is combined with the regulation site PsiO of the inducible promoter to repress the transcription of a downstream reporter gene; when D-psicose exists, PsiR is not combined with PsiO any more, transcription repression of a downstream reporter gene is relieved, and a fluorescence signal is generated. In a certain range, the signal intensity of the reporter gene is in direct proportion to the logarithm of the concentration of the D-psicose, so that the concentration of the D-psicose can be calculated by monitoring the fluorescence signal intensity. According to the present invention, the binding site PsiO of the transcription factor FdeR is fused with the strong promoter to construct the artificial chimeric promoter, such that the sensitivity and the monitoring range of the sensor are optimized; the biosensor constructed by the invention not only can be used for monitoring the concentration of D-psicose in the environment, but also can be used for monitoring the yield of a D-psicose production strain, and has great application potential in the fields of biochemical engineering, industrial microorganisms and food.