Patent ID: 8663917

Claim:
A process for obtaining genomic copy number information about genomic DNA from a diseased cell of an organism, which does not involve Representational Difference Analysis (RDA), comprising a) providing a representation of the genomic DNA by digesting the genomic DNA from the diseased cell with a single restriction endonuclease to provide digested DNA fragments, ligating an adaptor to the digested DNA fragments to form ligated DNA fragments, and polymerase chain reaction (PCR) amplifying the ligated DNA fragments using a single set of primers complementary to the adaptor to provide the representation of the genomic DNA; b) contacting nucleic acids from the representation provided in part (a), and a second representation obtained from genomic DNA from a normal cell from the same organism, with a microarray comprising i) a solid support with addresses of defined coordinates thereon; and ii) 1000 predetermined nucleic acid probes, wherein each probe has a different nucleic acid sequence; is affixed to an address of defined coordinates on the solid support; has 20 consecutive nucleotides in a sequence which is contained in the sequence of a member of said representation of part (a); and is mapped to a region of a genome, under conditions that allow hybridization between the nucleic acids and the nucleic acid probes to occur; c) detecting the hybridization at addresses of defined coordinates of the microarray in step b), d) obtaining genomic copy number information based on the hybridization detected in step c).