Method for polynucleotide amplification

C - Chemistry – Metallurgy – 12 – P

Patent

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Details

C12P 19/34 (2006.01) C12Q 1/68 (2006.01)

Patent

CA 2246225

The present invention relates to a method for selectively extending an oligonucleotide primer along a specific target polynucleotide sequence in a mixture of polynucleotides. The method comprises providing the modified oligonucleotide having a 3'-end that is not extendable along any polynucleotide and extending the oligonucleotide primer selectively along the specific target polynucleotide sequence by controlling the degradation of the 3'-end of the modified oligonucleotide. In this way extension along polynucleotides other than the specific target polynucleotide sequence is substantially reduced or avoided. In another aspect the invention is an improvement in a method for amplifying a target polynucleotide sequence. The improvement comprises deriving the oligonucleotide primer from a modified oligonucleotide having a portion that hybridizes to the target polynucleotide sequence except for the 3'-end thereof, which has at least one nucleotide analog that is incapable of hybridizing to a polyuncleotide. Kits for carrying out the above methods are also disclosed.

L'invention concerne une méthode permettant d'allonger sélectivement une amorce oligonucléotidique le long d'une séquence polynucléotidique cible spécifique dans un mélange de polynucléotides. Selon la méthode, on forme l'oligonucléotide modifié ayant une extrémité 3' qui ne peut pas s'allonger le long de n'importe quel polynucléotide, puis on allonge l'amorce oligonucléotidique sélectivement le long de la séquence polynucléotidique cible spécifique en contrôlant la dégradation de l'extrémité 3' de l'oligonucléotide modifié. Ceci permet de sensiblement réduire ou éviter l'extension de l'amorce oligonucléotidique le long de polynucléotides autres que la séquence cible. Dans un autre aspect, l'invention consiste en une amélioration d'une méthode permettant d'amplifier une séquence polynucléotidique cible. Selon la méthode, on dérive l'amorce oligonucléotidique d'un oligonucléotide modifié dont une partie s'hybride avec la séquence polynucléotidique cible à l'exception de l'extrémité 3' de celle-ci, qui possède au moins un analogue de nucléotide incapable de s'hybrider avec un polynucléotide. L'invention concerne également des trousses permettant de mettre en oeuvre ladite méthode.

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