A method for gene amplification

C - Chemistry – Metallurgy – 12 – N

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C12N 15/00 (2006.01) C12N 1/15 (2006.01) C12N 1/19 (2006.01) C12N 1/21 (2006.01) C12N 5/00 (2006.01) C12P 21/02 (2006.01) C12Q 1/68 (2006.01)

Patent

CA 2546502

[PROBLEMS] To provide a double-stranded DNA for amplifying a gene at a high speed and a method of amplifying a gene and a method of producing a protein using the same. [MEANS FOR SOLVING PROBLEMS] A system of artificially amplifying a gene at a high speed based on the gene replication (BIR: break- induced replication) system in vivo is constructed. High-speed gene amplification is triggered by transferring a double-stranded DNA having the sequences A-B-C and A~-B~-C~ or the reverse sequence of A~-B~-C~ (wherein A and A~ represent double-stranded DNA fragments capable of undergoing homologous recombination with each other one of which has a sequence reverse to the other; B and B~ represent amplification parts at least one of which contains a gene to be amplified; and C and C~ represent double-stranded DNA fragments capable of undergoing homologous recombination with each other one of which has a sequence reverse to the other; provided that an arbitrary DNA sequence may be inserted between them and B and B~ may be omitted (in this case, A or C may serve as a gene to be amplified) into a chromosome or a plasmid, and inducing the expression of an enzyme which arbitrarily cleaves a specific sequence so as to cause the occurrence of cleavage at a specific site.

L'invention concerne la réalisation d'un ADN à double brin pour amplifier un gène à grande vitesse, une méthode d'amplification génique et un procédé pour produire une protéine en conséquence. Un système est élaboré pour amplifier artificiellement un gène à grande vitesse, sur la base du système de réplication génétique par cassure (BIR) in vivo. L'amplification génique à grande vitesse est induite par le transfert d'un ADN à double brin comportant les séquences A-B-C et A'-B'-C' ou la séquence inverse de A'-B'-C'. A et A' représentent des fragments d'ADN à double brin aptes à subir une recombinaison homologue mutuelle, l'un ayant une séquence inverse à l'autre. B et B' représentent des éléments d'amplification dont un au moins contient un gène à amplifier. C et C' représentent des fragments d'ADN à double brin aptes à subir une recombinaison homologue mutuelle, l'un ayant une séquence inverse à l'autre. Selon l'invention, une séquence ADN arbitraire peut être insérée entre eux, B et B' peuvent être éliminés (auquel cas A ou C joue le rôle de gène à amplifier) en un chromosome ou en un plasmide, et l'induction de l'expression d'une enzyme divise arbitrairement une séquence spécifique pour provoquer une division en un site spécifique.

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