Method and kits for multiplex hybridization assays
View Patent ↗The invention provides a method for genotyping interfering polymorphic loci in a target polynucleotide, such as a strand of genomic DNA, in a multiplex hybridization-based assay. The invention also provides nucleic acid standards for validating the performance of such hybridization-based assays. In one aspect, the method of the invention is carried out by providing for each interfering polymorphic locus one or more probes so that at least one probe is capable of forming a perfectly match duplex at the locus regardless of the characteristic sequence of an adjacent polymorphism.
1. A kit of nucleic acid standards for determining the presence in a probe mixture of selected probes specific for interfering polymorphic loci, the kit comprising:
a plurality of nucleic acid standards provided in pairwise mixtures corresponding to different homozygous and heterozygous combinations of non-interfering polymorphic loci and different diploid combinations of haplotypes of interfering polymorphic loci, wherein each nucleic acid standard comprises a double stranded nucleic acid plasmid containing a nucleic acid sequence for at least one haplotype of the interfering polymorphic loci, wherein each nucleic acid standard is capable of replication and wherein there is at least one nucleic acid standard having a nucleic acid sequence complementary with each probe of the probe mixture; and
instructions that set forth a protocol comprising the steps of: hybridizing under stringent hybridization conditions each of said pairwise mixtures of said nucleic acid standards with a mixture of probes, such that the mixture of probes comprises probes specific for at least one of said nucleic acid standards in said pairwise mixture; and detecting the presence of probes in the mixture of probes that form stable duplexes with at least one of said nucleic acid standards of said pairwise mixture to determine whether such probes are present in the mixture.
2. The kit of claim 1 wherein said nucleic acid standards contain nucleic acid sequences of said interfering polymorphic loci in genes selected from HLA genes, tumor suppressor genes, cell cycle control genes, oncogenes, or genes encoding xenobiotic metabolizing enzymes.
3. The kit of claim 2 wherein said interfering polymorphic loci are in genes encoding said xenobiotic metabolizing enzymes that are selected from the group consisting of ABCB1, ABCC2, CYP1A2, CYP2A6, CYP2B6, CYP2C19, CYP2C8, CYP2C9, CYP2D6, CYP3A4, CYP3A5, DPYD, FMO3, GSTM1, NAT 1, NAT2, SLC21A6, SLC22A1, SLC22A2, TPMT, and UGT1A1.
4. The kit of claim 2 wherein said interfering polymorphic loci are in genes encoding said xenobiotic metabolizing enzymes that are selected from the group consisting of CYP1A1, CYP1B1, CYP2C18, CYP3A7, GSTT1, GSTM3, GSTA1, UGT1A6, UGT1A7, UGT2B4, UGT2B7, UGT2B15, ADH1B, ALDH2, APE1, CDKN2A, COMT, DRD2, DRD4, EPHX1, ERCC1, ERCC2, ERCC4, ERCC5, GRPR, GSTA4, LIG3, MDM2, MGMT, MPG, NQO1, OGG1, PCNA, POLB, SLC6A3, SOD2, TP53, XRCC1, XRCC2, XRCC3, XRCC9, ABCB1, CYP2E1, GSTP1, SLC22A2, ABCC2, CYP2J2, NAT1, TPMT, CDA, CYP3A4, NAT2, UGT1A1, CYP1A2, CYP3A5, CYP2C8, CYP2A6, DPYD, CYP2C9, CYP2B6, FMO2, SLC15A2, CYP2C19, FMO3, SLC21A6, CYP2D6, GSTM1, and SLC22A1.