Use of conjugates with linkers cleavable by...

G - Physics – 01 – N

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G01N 30/72 (2006.01) A61K 47/48 (2006.01) C12Q 1/68 (2006.01) G01N 33/483 (2006.01) G01N 33/68 (2006.01) H01J 49/16 (2006.01)

Patent

CA 2611266

The invention concerns a method for determining at least one target molecule map in a tissue section, using at least one (A-X)n-B conjugate, wherein A is a tag molecule of known molecular weight, X is a linker that is cleaved during sample desorption/ionization, n is an integer of at least l,and B is a binding molecule that binds specifically to said target molecule. When using MALDI mass spectrometry, said linker molecule X may be cleaved by photodissociation during sample laser irradiation if photocleavable at the wavelength of said MALDI laser. Alternatively, when using UV- MALDI, IR-MALDI, SIMS or DESI mass spectrometry, said linker molecule X may be cleaved by fragmentation during sample desorption/ionization.

L'invention concerne un procédé pour déterminer au moins une carte de molécule cible dans une section de tissu, au moyen d'au moins un conjugué (A-X)n-B, dans lequel A est une molécule d'étiquette ayant un poids moléculaire connu, X est un lieur qui est clivé pendant la désorption / l'ionisation de l'échantillon, n est un nombre entier d'au moins I, et B est une molécule de liaison qui se lie spécifiquement à ladite molécule cible. Lors de l'utilisation de la spectrométrie de masse MALDI, on peut cliver ladite molécule de lieur X par photodissociation pendant l'éclairage par laser de l'échantillon à la longueur d'onde dudit laser MALDI. En variante, pendant l'utilisation de MALDI-UV, de MALDI-IR, de SIMS ou de DESI en spectrométrie de masse, ladite molécule X peut être clivée par fragmentation pendant la désorption / l'ionisation de l'échantillon.

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