method for the determination of the methylierungsgrades of certain cytosinen in genomic dna in sequenzkontext 5 '- 3' cpg

摘要

Determining the degree of methylation of a particular cytosine in a motif 5'-CpG-3', present in a genomic sample of DNA (I), is new. Determining the degree of methylation of a particular cytosine in a motif 5'-CpG-3', present in a genomic sample of DNA (I), is new. The sample is treated chemically to convert cytosine (C), but not methylated C, to uracil, then part of (I) that contains the target C is amplified to form a labeled amplicon (II). (II) is hybridized to two classes, each with at least one member, of oligonucleotides and/or peptide-nucleic acid (PNA) oligomers (A) and the degree of hybridization to both classes is determined from the label on (II). From the ratio of labels hybridized to the two classes of (A), the degree of methylation is calculated. Independent claims are also included for the following: (1) a kit comprising a bisulfite, primer oligonucleotides for amplification, and/or (A), preferably immobilized on a solid phase, plus instructions; (2) a nucleic acid comprising at least 18 bases from chemically pretreated DNAs (B) of sequences (1) - (40712), not given in the specification; (3) oligonucleotide or PNA oligomers (OG) for use in the new process comprising a sequence of at least 9 nucleotides (nt) able to hybridize to (B); (4) sets of OG; (5) sets of at least two primer oligonucleotides for amplifying at least one (B) or its segment; (6) sets of oligonucleotide probes for determining the degree of C methylation and/or single nucleotide polymorphisms in (B), comprising at least ten OG; (7) preparing carrier-bound arrays of different OG for analysis of diseases associated with the methylation status of (B), by attaching OG to a solid phase; and (8) arrays made by (7).