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 said multicistronic transcription unit, and wherein an internal ribosome entry site (IRES) 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 startcodon. The invention also provides methods for obtaining host cells expressing a polypeptide of interest, said 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:
PROBLEM TO BE SOLVED: To provide a polynucleotide containing a ubiquitous chromatin-opening element which is not derived from an LCR (locus control region). SOLUTION: This isolated polynucleotide is provided by containing wide CpG islands without being methylated, except for a case that a DNase I highly susceptible part is correlated with a promotor characterized by a point that the polynucleotide opens the chromatin or maintains the chromatin in an open state, and facilitates the reproducible expression of an operably linked gene, and deleting the DNase I highly susceptible part. COPYRIGHT: (C)2008,JPO&INPIT
摘要:
本発明は、転写開始部位に対する-41位および/または-179位にC→G点変異を有するヒトCMV主要前初期(hCMV-MIE)プロモーター/エンハンサーである、SEQ ID NO:02またはSEQ ID NO:03の核酸配列を有するプロモーターを報告する。この新しいプロモーターは、低下したプロモーターサイレンシングおよび改善されたポリペプチド産生を示すため、ポリペプチドの大規模産生のために特に有用である。
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 said multicistronic transcription unit, and wherein an internal ribosome entry site (IRES) 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 startcodon. The invention also provides methods for obtaining host cells expressing a polypeptide of interest, said 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:
The present invention relates to a method of selecting high producer clones by using an expression vector, the expression vector comprising: (i) a gene expression cassette comprising a selectable marker gene to which polyA has been inoperably linked; and (ii) a gene expression cassette which encodes a recombinant protein of interest and to which polyA has been operably linked. According to the invention, high producer clones can be selected from cell populations at least 10 times fewer than in the existing methods of selecting cell lines. Particularly, high producer clones can be selected using a low concentration of MTX compared to a conventional stepwise gene amplification strategy which comprises carrying out multiple amplification steps while increasing the concentration of MTX. Accordingly, the development period of cell lines can be shortened and the labor and cost required for selection of high-productivity cell clones can be reduced, whereby more efficient production of proteins is possible even when general selectable marker genes other than MTX are used.