摘要:
This invention concerns a method for effecting homologous recombination between a native nucleic acid segment in a cell and a donor nucleic acid segment introduced into the cell, which comprises: a) introducing into a cell a nucleic acid delivery system comprising: (i) an oligonucleotide third strand which comprises a base sequence capable of forming a triple helix at a binding region on one or both strands of a native nucleic acid segment, (ii) a donor nucleic acid, comprising a nucleic acid sequence sufficiently homologous to the native nucleic acid segment such that the donor sequence is capable of undergoing homologous recombination with the native sequence at the target region, (iii) an adapter segment comprising an oligonucleotide sequence able to bind at least a portion of said donor nucleic acid through Watson-Crick base pairing, the adapter segment being linked to said oligonucleotide third strand, b) allowing the oligonucleotide to bind to the native nucleic acid segment to form a triple helix nucleic acid, thereby inducing homologous recombination at the native nucleic acid segment target region; and c) allowing homologous recombination to occur between the native and donor nucleic acid segments. The method may namely be implemented for effecting gene alteration or mutation repair at a specific sequence site on a native DNA.
摘要:
The present invention describes methods of identifying altered recombinases and compositions thereof, wherein at least one amino acid is different from a parent, wild-type recombinase and the altered recombinase has improved recombination efficiency towards wild-type and/or pseudo at site sequences relative to the parent, wild-type recombinase. The present invention also includes methods of modifying the genomes of cells using the altered recombinases, including methods of site-specifically integrating a polynucleotide sequence of interest in a genome of a eucaryotic cell.
摘要:
Disclosed are novel compositions and methods useful for modulating expression of a target gene in a cell by insertion of exogenous DNA sequence into the target gene. The compositions and methods of the invention are useful for generation of knockout animals including mammals.
摘要:
The invention comprises a method of assembling several DNA units in sequence in a DNA construct and all derivatives of this method. In particular the production of synthetic enzymes is contemplated. Each DNA unit is provided with the same restriction enzyme recognition site at its 5' and 3' ends. The restriction recognition site at its 3' end being combined with a recognition site for a DNA modification enzyme. A DNA construct having the same or a compatible accessible restriction site, as provided in the DNA unit, is cleaved at the restriction site by the appropriate restriction enzyme. The desired DNA unit is then inserted into the DNA construct, this ligated product subsequently being brought into contact with a DNA modification enzyme such that the restriction site at the 3' end of the inserted DNA unit is abolished. The ligated product is then cleaved at the remaining unmodified restriction recognition site and a subsequent DNA unit is inserted. This process is repeated introducing each desired DNA unit to give a DNA construct containing all the desired units in sequence.
摘要:
This invention concerns a method for effecting homologous recombination between a native nucleic acid segment in a cell and a donor nucleic acid segment introduced into the cell, which comprises :
a) introducing into a cell a nucleic acid delivery system comprising:
(i) an oligonucleotide third strand which comprises a base sequence capable of forming a triple helix at a binding region on one or both strands of a native nucleic acid segment, (ii) a donor nucleic acid, comprising a nucleic acid sequence sufficiently homologous to the native nucleic acid segment such that the donor sequence is capable of undergoing homologous recombination with the native sequence at the target region, (iii) an adapter segment comprising an oligonucleotide sequence able to bind at least a portion of said donor nucleic acid through Watson-Crick base pairing, the adapter segment being linked to said oligonucleotide third strand,
b) allowing the oligonucleotide to bind to the native nucleic acid segment to form a triple helix nucleic acid, thereby inducing homologous recombination at the native nucleic acid segment target region ; and c) allowing homologous recombination to occur between the native and donor nucleic acid segments.
The method may namely be implemented for effecting gene alteration or mutation repair at a specific sequence site on a native DNA.
摘要:
Methods and compositions are provided for expression of mammalian genes in culture. An amplifiable gene is introduced by homologous recombination in juxtaposition to a target gene, the resulting combination of amplifiable gene and target gene transferred to a convenient host and the target gene amplified by means of the amplifiable gene. The resulting expression host may then be grown in culture with enhanced expression of the target gene.
摘要:
A product of gene integration prepared by integrating an arbitrary gene into a chromosomal DNA of a bacillus of Lactobacillus delbrueckii species through a method which comprises constructing an integration plasmid by combining pAMβ1 plasmid with a target gene, subjecting the obtained plasmid to conjugation transfer and homologous recombination to thereby integrate only the target gene into the chromosomal DNA, and eliminating the DNA sequence of the pAMβ1 as a vector. The product can be widely applied to the production of food, drug and feed.
摘要:
Selon l'invention, l'on obtient des cellules hôtes recombinées qui comprennent (A) un segment polynucléotidique hétérologue codant pour des polypeptides, intégré de façon stable dans un chromosome, qui est sous le contrôle transcriptionnel d'un promoteur endogène, et (B) une mutation qui effectue l'expression augmentée du segment hétérologue, cela ayant pour résultat une production, par les cellules hôtes de chaque polypeptide codé par ce segment, plus élevée, si l'on compare avec la production de chaque polypeptide, par les cellules hôtes, en l'absence de la mutation. L'expression augmentée ainsi obtenue est retenue en l'absence des conditions favorables aux cellules qui font preuve d'une telle expression augmentée. Lorsque le segment intégré comprend, par exemple, des gènes de la production d'éthanol provenant d'un producteur d'éthanol efficace tel que le Zymomonas mobilis, l'Escherichia coli recombiné et d'autres cellules bactériennes entériques, selon l'invention, sont capables de transformer en éthanol, de façon efficace, une large gamme de sucres dérivés de la biomasse.
摘要:
The invention relates to a mammalian cell, particularly a human cell, expressing a first isoform of a surface protein, wherein the first isoform is functionally indistinguishable, but immunologically distinguishable from a second isoform, for use in a medical treatment of a patient having cells expressing the second isoform form of the surface protein. The invention further relates to an agent selected from 1) a compound comprising, or consisting of, an antibody or antibody-like molecule and 2) an immune effector cell bearing an antibody-like molecule or an immune effector cell bearing a chimeric antigen receptor, for use in a method of treatment of a medical condition, wherein the agent is specifically reactive to either a first or a second isoform of a surface protein, wherein the first isoform is functionally indistinguishable, but immunologically distinguishable from the second isoform, and wherein the agent is administered to ablate a cell bearing the isoform that the agent is reactive to.