Abstract: Disclosed herein is a process for stripping oligonucleotide target from a microarray to allow reuse of the microarray. The process comprises providing a microarray having probe oligonucleotides attached thereto and target oligonucleotides hybridized to the probe oligonucleotides. The microarray is then incubated with a formulation comprising an organic solvent and an organic base. The target oligonucleotides are substantially removed from the microarray by the formulation. Alternatively, prior to or after incubation of the microarray with the formulation, the microarray may be contacted to an aqueous solution of a base to improve the efficiency of removal of the target oligonucleotides.

Abstract: There is disclosed a microarray-based single nucleotide polymorphism, sequencing, and gene expression assay method. Specifically, there is disclosed a method using a microarray device wherein a plurality of hybridized structures is formed by contacting the microarray under a hybridizing condition to a hybridizing solution comprising a plurality of tagged targets and a plurality of detection sequences. The detection sequences of each hybridized structure is extended using an extension-ligation solution and an extension-ligation condition. After extension, ligation of the extended sequence occurs to a probe if the terminal nucleotide of a probe is complementary to the hybridized tagged targets. Non-bound material is removed by using a washing solution and a washing method. The target nucleotide and the target sequence of the tagged targets is determined by which probe is ligated to the detection sequences.