摘要:
The invention is concerned with the systematic elucidation and identification of regulatory sequences. The invention provides among others screenings and detection methods with which regulatory sequences can be identified. The invention further provides regulatory sequences and use thereof in various fields such as, but not limited to protein production, diagnostics, transgenic plants and animals, and the therapeutic field.
摘要:
The invention is concerned with the systematic elucidation and identification of regulatory sequences. The invention provides among others screenings and detection methods with which regulatory sequences can be identified. The invention further provides regulatory sequences and use thereof in various fields such as, but not limited to, protein production, diagnostics, transgenic plants and animals, and the therapeutic field.
摘要:
The invention relates to a method of detecting a DNA sequence which at least partially contributes to promote the stable expression of a gene. To this end the DNA fragment to be examined is cloned in a vector between i) a DNA sequence involved in the induction of gene transcription repressing chromatin, and ii) a reporter gene. The invention also relates to a DNA sequence to be detected by means of the invention, and the application of a stable expression-enhancing DNA sequence for the stable expression of a gene.
摘要:
Described is a DNA molecule comprising an open reading frame sequence encoding a selectable marker polypeptide, wherein the DNA molecule in the coding strand comprises a translation start sequence for the selectable marker polypeptide having a GTG or TTG start codon, and wherein the ORF sequence that encodes the selectable marker protein has been mutated to replace at least half of its CpG dinucleotides as compared to the native ORF sequence that encodes the selectable marker protein. Further provided are such DNA molecules wherein the ORF sequence that encodes a selectable marker polypeptide is part of a multicistronic transcription unit that further comprises an open reading frame sequence encoding a polypeptide of interest. Also described are methods for obtaining host cells expressing a polypeptide of interest, wherein the host cells comprise the DNA molecules described herein. Further provided is the production of polypeptides of interest, comprising culturing host cells comprising the DNA molecules described herein.
摘要:
The invention provides a DNA molecule comprising a multicistronic transcription unit coding for i) a polypeptide of interest, and for ii) a selectable marker polypeptide functional in a eukaryotic host cell, wherein the polypeptide of interest has a translation initiation sequence separate from that of the selectable marker polypeptide, and wherein the coding sequence for the polypeptide of interest is upstream from the coding sequence for the selectable marker polypeptide in the multicistronic transcription unit, and wherein an internal ribosome entry site is present downstream from the coding sequence for the polypeptide of interest and upstream from the coding sequence for the selectable marker polypeptide, and wherein the nucleic acid sequence coding for the selectable marker polypeptide in the coding strand comprises a GTG or a TTG start codon. Also provided are methods for obtaining host cells expressing a polypeptide of interest, such host cells comprising DNA molecules of the invention. Further provided is the production of polypeptides of interest, comprising culturing host cells comprising the DNA molecules of the invention.
摘要:
The invention provides a DNA molecule comprising a multicistronic transcription unit coding for i) a selectable marker polypeptide functional in a eukaryotic host cell, and for ii) a polypeptide of interest, the polypeptide of interest having a translation initiation sequence separate from that of the selectable marker polypeptide, characterized in that the coding sequence for the polypeptide of interest is downstream from the coding sequence for the selectable marker in the multicistronic transcription unit, and the nucleic acid sequence coding for the selectable marker polypeptide comprises a mutation that decreases the translation efficiency of the selectable marker in a eukaryotic host cell. The invention also provides methods for obtaining host cells expressing a polypeptide of interest, the host cells comprising the DNA molecules of the invention. The invention further provides the production of polypeptides of interest, comprising culturing host cells comprising the DNA molecules according to the invention.
摘要:
Described is a DNA molecule comprising an open reading frame sequence encoding a selectable marker polypeptide, wherein the DNA molecule in the coding strand comprises a translation start sequence for the selectable marker polypeptide having a GTG or TTG start codon, and wherein the ORF sequence that encodes the selectable marker protein has been mutated to replace at least half of its CpG dinucleotides as compared to the native ORF sequence that encodes the selectable marker protein. Further provided are such DNA molecules wherein the ORF sequence that encodes a selectable marker polypeptide is part of a multicistronic transcription unit that further comprises an open reading frame sequence encoding a polypeptide of interest. Also described are methods for obtaining host cells expressing a polypeptide of interest, wherein the host cells comprise the DNA molecules described herein. Further provided is the production of polypeptides of interest, comprising culturing host cells comprising the DNA molecules described herein.
摘要:
Described are means and methods for providing a cell with a protein expression unit, the method comprising providing a nucleic acid sequence comprising the unit with a nucleic acid sequence encoding a binding site for a member of a chromatin modification system for rendering chromatin more accessible for transcription (opener), wherein the opener is present in the cell. Preferred openers comprise histone modification proteins, chromatin remodeling proteins and trithorax group proteins or equivalents. The cells thus generated and nucleic acid sequences encoding such openers are provided. Openers are preferred in the context of STAR and TRAP sequences.
摘要:
Described is a DNA molecule comprising an open reading frame sequence that encodes a selectable marker polypeptide, wherein the DNA molecule in the coding strand comprises a translation start sequence for the selectable marker polypeptide having a GTG start codon or a TTG start codon, and wherein the ORF sequence that encodes the selectable marker protein has been mutated to replace at least half of its CpG dinucleotides as compared to the native ORF sequence that encodes the selectable marker protein. Further provided are such DNA molecules wherein the ORF sequence that encodes a selectable marker polypeptide is part of a multicistronic transcription unit that further comprises an open reading frame sequence encoding a polypeptide of interest. Also described are methods for obtaining host cells expressing a polypeptide of interest, wherein the host cells comprise the DNA molecules described herein. Further provided is the production of polypeptides of interest, comprising culturing host cells comprising the DNA molecules described herein.
摘要:
Described is the production of proteins in a host cell. More specifically, described are methods for improving expression of two or more proteins in a cell or host cell. The methods are suited for production of, for example, recombinant antibodies that can be used in pharmaceutical preparations or as diagnostic tools. In one embodiment, provided is a method for obtaining a cell that expresses two or more proteins comprising providing the cell with two or more protein expression units encoding two or more proteins, characterized in that at least two of the protein expression units comprise at least one STAR sequence.