Assay and process for labeling and detection of micro rna...

C - Chemistry – Metallurgy – 12 – Q

Patent

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C12Q 1/68 (2006.01)

Patent

CA 2531123

A process for protecting a short RNA fragment includes labeling a short RNA fragment with a detectable platinum compound forming a labeled small RNA fragment. Resulting labeled short RNA fragment is exposed to a capture oligonucleotide. The capture oligonucleotide includes at least two replicates of a nucleotide sequence complimentary to the short RNA fragment nucleotide sequence. The labeled short RNA fragment and the captured oligonucleotide sequence are brought into contact under hybridization conditions. With hybridization, the marker moiety is detected on the hybridized labeled small RNA fragment-~captured oligonucleotide conjugant. A detection array for short RNA fragment includes a substrate having multiple spots, with a first spot including a first capture oligonucleotide including at least two replicates of a nucleotide sequence complimentary to a first short RNA fragment along with an additional nucleotide sequence functioning as a universal controller or spacer. Another spot on the array includes a second capture oligonucleotide having at least two replicates of a sequence complimentary to a second short RNA fragment along with an additional sequence functioning as a universal controller or spacer. Verified small RNA fragments are also obtained after mobilizing a sequence through elution and optional platinum compound removal therefrom.

L'invention porte sur un procédé de protection d'un court fragment d'ARN qui consiste à marquer un court fragment d'ARN avec un composé de platine détectable formant un petit fragment d'ARN marqué. Le court fragment d'ARN marqué obtenu est exposé à un oligonucléotide de capture. Cet oligonucléotide de capture comprend au moins deux réplications d'une séquence nucléotidique complémentaire à la séquence nucléotidique du court fragment d'ARN. Le court fragment d'ARN marqué et la séquence oligonucléotidique capturée sont mis en contact dans des conditions d'hybridation. Par l'hybridation, la fraction du marqueur est détectée sur le petit fragment d'ARN marqué hybridé--le conjugant oligonucléotidique capturé. Un réseau de détection du court fragment d'ARN comprend un substrat possédant plusieurs points, un premier point comprenant une premier oligonucléotide de capture comportant au moins deux réplications d'une séquence nucléotidique complémentaire au premier fragment court d'ARN avec une additionnelle nucléotidique fonctionnant comme un contrôleur ou espaceur universel. Un autre point du réseau comprend un second oligonucléotide de capture possédant au moins deux réplications d'une séquence complémentaire à un second fragment court d'ARN avec une séquence additionnelle fonctionnant comme un contrôleur ou espaceur universel. On obtient ainsi des petits fragments d'ARN vérifiés après mobilisation d'une séquence par élution et un retrait optionnel de celle-ci d'un composé de platine.

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