70 results about "Piggybac transposon" patented technology

The present invention provides hyperactive piggyBac transposons, in particular hyperactive piggyBac transposons from Trichoplusia ni (cabbage looper moth) that transpose at a higher frequency than wildtype. The invention also features integration defective piggyBac transposons. The piggyBac transposons and transposases can be used in gene transfer systems for stably introducing nucleic acids into the DNA of a cell. The gene transfer system can be used in methods, for example, but not limited to, gene therapy, insertional mutagenesis, or gene discovery.

The invention discloses a compound type piggyBac recombinant vector as well as a preparation method and an application of the compound type piggyBac recombinant vector. According to the recombinant vector, a target gene expression frame, selection marker gene expression frames I and II, piggyBac transposase expression frame regulated by a heat shock promoter and truncated type piggyBac transposon arms L2 and R2 are inserted between wild type piggyBac transposon arms R1 and L1, integration of target gene, selection marker gene, piggyBac transposase expression frame sequence in silkworm genome can be conveniently mediated, complete deletion of all of transposon sequences and selection marker gene sequences in progeny transgenosis silkworm genome can be realized through establishing and screening a transgenosis silkworm line with high target gene expression and then inducing piggyBac to express in the transgenosis silkworm by heat shock treatment, replacement of other exogenous gene and the target gene can be conveniently realized through box type exchange reaction mediated by phiC31 integrase by surplus target gene expression frame anchored by attP locus, and then fixed point integration of other exogenous genes in the genome locus is further realized.

The invention belongs to the field of genetic engineering, and specifically relates to a method of domestic silkworm transgene for controlling domestic silkworm pupal stage growth through UAS/GAL4 dual system. According to the method, piggyBAC transposon vector pigA3GFP is adopted as a base vector; through genetic engineering operation, GAL4 gene expressed transgenic domestic silkworm PDP-GAL4 system controlled by domestic silkworm cocoon protease gene promoter (PDP) is established; through genetic engineering operation, domestic silkworm baculovirus egt gene or charybdotoxin BmKIT3R gene expressed transgenic domestic silkworm UAS-egt or UAS-BmKIT3R system controlled by UAS promoter is established; the PDP-GAL4 system and the UAS-egt or UAS-BmKIT3R system are hybridized, such that larval stage growth of an F1 generation is normal, and pupal stage of the F1 generation is prolonged for 7 to 10 days. According to the invention, with an UAS/GAL4 dual system, the F1 generation silkworm pupal stage is prolonged by using domestic silkworm baculovirus egt gene or BmKIT3R gene. Flexibilities of silkworm cocoon purchasing and filature technology are improved. Therefore, the invention has important application value.

The invention discloses a method for producing transgene silkworms for improving resistance to nuclear polyhedrosis. A transgene vector which carries dsRNA expression cassette of ie-1 genes of bombyx mori nuclear polyhedrosis viruses, dsRNA expression cassette of lef-1 genes, is provided with neomycin resistance genes Neo and fluorescent protein reporter genes, and based on a piggyBAC transposon, is established through gene engineering operations. The transgene vector is introduced into primarily laid eggs, and the resistance of the transgene silkworms to nuclear polyhedrosis is significantly improved. By combing transgenes with RNAi technology, the resistance of silkworms to nuclear polyhedrosis is improved, and the screening process of transgene silkworms is optimized.

The invention discloses a reconstructed human serum albumin gene suitable for cultivated silk gland expression and an expression system and application thereof. The reconstructed human serum albumin gene is as shown as the 7-1767th in SEQ ID NO.1, and the coded amino acid is as shown in SEQ ID NO.2. The reconstructed human serum albumin gene, a secretion type sericin 1 gene promoter and a secretion type sericin 1 gene terminator form an expression frame, an enhancer Hr3 is used for enhancing expression, and simultaneously a piggyBac transposon and a fluorescent screening marker gene construct an expression system. The expression system can highly effectively express recombined human serum albumin in cultivated silk gland, has biological activity, can be used for large scale production of recombined human serum albumin, and has good market prospect.

The invention discloses application of a phiC31 recombinase system and a piggyBac transposon and a fixed point transgenetic system of silkworm and a preparation method of the fixed point transgenetic system. According to the invention, the phiC31 recombinase system and the transgenic technology for mediating the silkworm to transform by the piggyBac transposon are combined; first, two attB sites or attP sites which are arranged in the same direction are connected into a piggyBac transposon carrier; the carrier in transformed into silkworm; then, single copy transgenetic silkwork is screened to be used as a target system; then, the target system is transformed by using the phiC31 recombinase and a carrier, wherein target gene expression frames are anchored at the two ends of the carrier by the attB sites or attP sites which are arranged in the same direction; and thus the target gene expression frames are transformed to the place between fixed points, namely the two attB sites or attP sites of the piggyBac transposon carrier, thereby realizing the purpose of fixed point transgene of silkwork. The method is simple to operate and provides a powerful tool for genetic function research for silkworm.

The present invention is directed to a transformation systems and vectors for making transgenic organisms that includes a vector containing a modified piggyBac transposon into which is inserted at least one fluorescent protein gene linked to a polyubiquitin promoter sequence. A helper transposase vector that includes an hsp70 promoter sequence upstream of the putative piggyBac promoter that increases the transformation frequency of this system can also be included.

The invention belongs to the field of genetic engineering, and in particular relates to a method for improving egg laying amount of an original strain of mulberry silkworm. The method comprises the following steps: by using a piggyBAC transposons carrier containing a fluorescent protein reporter gene as a basic carrier, constructing a transgenetic mulberry silkworm vlg-GAL4 system or a nanos-GAL4 system which controls GAL4 genetic expression through a vasa-like genetic promoter or a nanos-like genetic promoter through operation of genetic engineering; constructing a transgenetic mulberry silkworm UAS-ovo-1 system which controls genetic expression of mulberry silkworm ovo-1 through a UAS promoter through operation of genetic engineering; hybridizing the vlg-GAL4 system or nanos-GAL4 system with the UAS-ovo-1 system to obtain first-filial generation mulberry silkworm; and selfing and laying by the mulberry silkworm obtained, so that the egg laying amount of original strain of mulberry silkworm is improved. The method provided by the invention over-expresses mulberry silkworm ovo-1 genes in the genital gland through the GAL4/UAS binary system, so that the laying level of a single moth is improved, the laying amount is increased by over 10%, and meanwhile, the production cost of cocoons is lowered. The method has important application value.

The invention discloses a method for breeding Macropodus opercularis with a transferred green fluorescent protein gene by using piggyBac transposons, which comprises the following steps of: firstly, constructing piggyBac transposons with green fluorescent protein genes and a helper plasmid capable of providing transposase; and secondly, transferring the two transposons into a germ cell of the Macropodus opercularis by using microinjection technology, and according to the transposons characteristics of the piggyBac transposons, introducing the green fluorescent protein genes into a genome of the Macropodus opercularis so as to make the gene inherited and expressed stably. An individual of transgenic Macropodus opercularis can be screened by means of the fluorescence-labeled gene, and the Macropodus opercularis with the transferred green fluorescent protein gene is more worthy of appreciation and represents a new variety of Macropodus opercularis with specific function. In addition, it is the first time for the piggyBac transposons to be used in researches on transgenic fish, and thus, the research space for transgenic aquatic animals is widened.

The invention discloses an efficient transgenosis method with mediation of a transcription activator-like effector (TALE) protein. The method comprises the steps that a helper plasmid containing a transcription activator-like effector protein DNA (Deoxyribonucleic Acid) sequence and piggyBac transposon (PBase) DNA sequence is constructed by adopting a molecular biological technique, and transcribed to mRNA (Messenger Ribonucleic Acid) in vitro; mRNA of the helper plasmid and DNA of a piggyBac transposon plasmid containing an exogenous gene are imported to a fertilized egg of an animal by adopting a microinjection method; a transgenic animal of which the exogenous gene can be stably inherited and expresses is obtained; and a transgenosis positive individual is screened out according to a marker gene or the expression characteristic of the gene. With the adoption of the method, a piggyBac transposon can be efficiently inserted into a genome of a host organism by the action of a TALE-PBase fusion protein; the transgenosis efficiency mediated by the piggyBac transposon can be improved remarkably; and helps are offered to researches such as transgenic animal acquirement and insertion mutagenesis.

The present invention relates to an improved PB transposon system and application thereof. Specifically, the present invention relates to a nucleic acid construct. The nucleic acid construct sequentially contains a promoter for controlling the expression of PiggyBac transposase, a PiggyBac transposase coding sequence, a terminal repeat at the 5'-end of the PiggyBac transposon, an optional polyA tailing signal sequence 1, a polyclonal insertion site, a polyA tailing signal sequence 2 and a terminal repeat at the 3'-end of the PiggyBac transposon. A recombinant vector constructed by using the nucleic acid construct provided by the invention has obviously improved integration efficiency.

The invention relates to a novel genetically modified plasmid vector, its construction and a cultivation method of silkworms containing a novel recombination gene in vivo. The novel genetically modified silkworm has a recombinant fibroin heavy chain protein gene containing MMPs enzyme sites. The invention belongs to the field of agricultural insect excellent variety cultivation and utilization. A flow diagram for construction of the novel genetically modified vector is as shown in the attached map. By the characteristic that the MMPs enzyme sites can undergo MMPs enzyme digestion, the MMPs enzyme sites are introduced into silkworm fibroin. Thus, the silkworm fibroin has new properties and the purpose of modifying silkworm fibroin through a biological method is achieved. According to the patent, the recombinant fibroin protein gene is cloned to a PiggyBac transposon vector; the vector is injected into silkworm eggs through a micro-injection method; after incubation of the silkworm eggs, individuals with green fluorescence eyes are selected so as to determine the successfully-cultivated novel genetically modified silkworms.

The invention discloses a construction method of a piggyBac transposon vector for producing a transgenic goat. The construction method mainly comprises the steps of: (1) synthesizing a section of base sequence comprising a PB5' end and a PB3' end necessary for transposition of a piggyBac transposon, reserving multiple cloning sites in the middle of the PB5' end and the PB3' end during synthesis, and then cloning the sequence into a pBluSKm vector to construct a pBluSKm-PB vector; and then cloning a rumen-specific expression promoter PRD-SPRR II, cysteine synthesis genes cysE and cysM which are subjected to codon preferred optimization, a Neomycin resistant gene and a green fluorescent protein gene to the pBluSKm-PB vector to finally construct a pBluSKm-PB-PRD-cysEM-NEO-EGFP transposon vector. The transposon vector obtained by the invention can meet the requirements of cell screening, micromanipulation under an inverted fluorescence microscope, production of the transgenic goat and the like.

The invention discloses a method for synthesizing and secreting black widow spider traction silk protein 2 through a silkworm silkgland bioreactor. The method comprises the steps that a pBac[3xP3-DsRed]-MaSp2 plasmid carrier of the black widow spider traction silk protein 2 synthesized and secreted by silkworms is built, then the plasmid and auxiliary plasmid are introduced into silkworm fertilized ova through micro-injection, red fluorescence protein genes and black widow spider traction silk protein 2 are introduced into silkworm gene groups through transposition characteristics of a piggyBac transposon, inheritance and expression are stabilized, transgenic silkworms are made, silkworm moth selfing is carried out to achieve homozygosis of black widow spider traction silk protein 2 genes, and the transgenic silkworms for secreting black widow spider traction silk protein 2 are bred. The transgenic silkworms are screened by means of fluorescence marker genes, the black widow spider traction silk protein 2 is specifically synthesized through the silkworm silkgland cells for spider silk development and utilization, and meanwhile the mechanical performance of silk is improved.

The invention relates to a bombyx mori whole genome knockout vector library based on a CRISPR/Cas9 system and a construction method. The vector library comprises a delivery vector system piggyBac transposon vector system used for delivering a CRISPR/Cas9 system and a vector library pB-CRISPR-library composed of sgRNA sequences of targeting sites of genes of all encoding proteins of bombyx mori. According to the invention, based on the strong bearing capacity of the piggyBac transposon system, a Cas9 protein expression cassette and an sgRNA expression cassette, which are two constituent elements of a CRISPR/Cas9 system, can be integrated into one vector; and meanwhile, the vector further comprises a screening marker Zeocin resistance gene expression cassette, and the two parts jointly forman all-in-one vector pB-CRISPR for CRISPR/Cas9 knockout of bombyx mori.

The invention relates to a spider MaSps gene and an application of the spider MaSps gene in preparation of drug-loaded nanoparticles. The artificially designed and modified optimized spider MaSps geneis disclosed for the first time; a transgenic expression cassette in which fusion expression of a silk fibroin heavy chain protein (Fib-H) gene and a spider MaSps gene is regulated and controlled bya bombyx mori silk fibroin heavy chain promoter is constructed; a piggyBac transposon arm and a fluorescent selection marker gene are connected to construct a transgenic expression vector; the expression vector can be used for establishing transgenic bombyx mori capable of efficiently expressing recombinant fusion MaSps protein in bombyx mori silk glands, so that transgenic cocoon silk containingthe recombinant fusion MaSps protein in silk fibroin is obtained; and further a transgenic silk material which can stably secrete the recombinant MaSps protein in a silk fibroin layer and has the effects of promoting controlled release of drugs and endocytosis is obtained.