Methods for measuring relative amounts of nucleic acids in a...

C - Chemistry – Metallurgy – 12 – Q

Patent

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C12Q 1/68 (2006.01)

Patent

CA 2275549

The present invention relates to a method for the comparative assessment of the level of specific nucleic acid sequences in samples derived from different sources. More specifically, the invention relates to a method using oligonucleotides covalently linked to a solid support, such as beads, to isolate specific labeled nucleic acid sequences from complex mixtures. The methods disclosed allow quantitative comparisons of the amount of nucleic acid of defined sequence in a plurality of different samples of nucleic acid, e.g., from different cells or tissues or from genetic libraries. Nucleic acids from the samples are labeled in such a fashion that the signals can be distinguished and compared following hybridization to the oligonucleotides on the beads. According to the invention, the solid supports with the hybridized nucleic acid may be retrieved, and the target nucleic acid eluted and analyzed. Furthermore, the invention provides a method for tagging individual clones from a cDNA library such that they can be identified uniquely and retrieved by hybridization to specific beads.

Cette invention a trait à un procédé d'évaluation comparative de concentrations en séquences spécifiques nucléotidiques dans des échantillons provenant de diverses sources. Elle concerne, plus particulièrement, un procédé faisant intervenir des oligonucléotides liés de manière covalente à un support solide, des billes par exemple, afin d'isoler des séquences spécifiques nucléotidiques marquées dans des mélanges complexes. Les procédés de l'invention permettent d'effectuer des comparaisons quantitatives de la concentration en acide nucléique d'une séquence définie dans une pluralité d'échantillons différents d'acide nucléique, provenant, par exemple, de cellules ou de tissus différents ou de banques génétiques. Les acides nucléiques provenant des échantillons sont marqués de manière que les signaux puissent être différenciés et comparés après hybridation aux oligonucléotides se trouvant sur les billes. Il est possible, au titre de cette invention, de prélever les supports solides porteurs de l'acide nucléique hybride ainsi que d'éluer et d'analyser l'acide nucléique cible. Cette invention a trait, en outre, à un procédé permettant de marquer des clones individuels en provenance d'une banque génomique et ce, afin qu'ils puissent être identifiés uniquement et extraits par hybridation à des billes spécifiques.

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