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is agene
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Full namecytochrome P450, family 2, subfamily D, polypeptide 6
# SNPs291
  Max Magnitude Chromosome position Summary
I4001386 40,855,700
I4001394 40,852,582
I4001396 40,856,665
I4001397 40,855,126
I4001398 40,852,565
I4001401 40,855,120
I4001402 40,856,656
I4001412 40,852,622
I4001417 40,853,536
I4001425 40,855,013
I4001426 40,853,977
I4001428 40,853,460
I4001432 40,854,980
I4001433 40,854,979
I4001440 40,854,434
I4001456 40,854,879
I4001460 40,855,896
I4001461 40,854,868
I4001467 40,853,799
I4001473 40,854,271
I4001477 40,854,257
I4001478 40,854,254
I4001479 2.5 40,854,764
I4001483 40,855,782
I4001486 40,855,767
I4001495 40,855,224
I4001501 40,855,716
Rs1058164 42,525,132
Rs1058170 0 42,523,930
Rs1058171 0 42,523,928
Rs1058172 0 42,523,528
Rs1065569 0 42,523,502
Rs1065852 3.2 42,526,694 CYP2D6 drug metabolism
Rs1075944 0 42,524,401
Rs1080983 0.1 42,528,568
Rs1080984 0 42,528,392
Rs1080985 0.1 42,528,382
Rs1080986 0 42,528,216
Rs1080987 0 42,528,206
Rs1080988 42,528,034
Rs1080989 42,527,793
Rs1080990 0 42,527,753
Rs1080992 0 42,527,158
Rs1080993 0 42,526,969
Rs1080995 42,526,580
Rs1080996 42,526,573
Rs1080997 42,526,571
Rs1080998 0 42,526,567
Rs1080999 42,526,561
Rs1081000 42,526,549
… further results

The wikipedia article on CYP2D6 is a good resource to learn about this gene, and includes a large table of the drugs known to be metabolized by the CYP2D6 protein. In fact, almost 25% of all drugs are metabolized by CYP2D6, including dextromethorphan (a key ingredient in products such as Nyquil), beta-blockers, antiarrhythmics, and antidepressants.

The authoritative source for defining alleles is the CYP Allele Nomenclature Committee's CYP2D6 Allele Nomenclature page.

In articles on CYP2D6 it is common to see the positions described within a reference sequence of the gene rather than SNP IDs or reference genome positions. The reference sequence used is M33388. The sequence starts at genome build 36.3 position 40856738 or genome build 37.1 position 42526794. It is on the reverse strand, which means that M33388 positions must be subtracted from the start position. In addition, M33388 positions from 601 to 1330 need to be decremented by 1, and positions from 1440 and up incremented by 1 before conversion. It also appears that negative positions need to be adjusted, but it isn't clear what standard is used to do so. Alleles are stated in minus orientation.

[PMID 19817501] appears to be a good survey of known effects of alleles.

Many variants of CYP2D6 are known. The main CYP2D6 alleles are the following:

CYP2D6*1 - the most common form, considered 'fully functional'; also known as wild-type, or WT
CYP2D6*2 - normal function except CYP2D6*2XN variants
CYP2D6*3 - nonfunctioning variant
CYP2D6*4 - nonfunctioning variant; the most common variant; rs3892097
CYP2D6*5 - nonfunctioning variant; consists of a complete deletion of the gene
CYP2D6*6 - nonfunctioning variant; rs5030655
CYP2D6*9 - partially functioning variant
CYP2D6*10 - partially functioning variant; rs1065852
CYP2D6*17 - partially functioning variant

[PMID 17115111] CYP2D6 metabolism, as measured by genetic variation and enzyme inhibition, is an independent predictor of Breast cancer outcome in post-menopausal women receiving tamoxifen for early breast cancer. Determination of CYP2D6 genotype may be of value in selecting adjuvant hormonal therapy and it appears CYP2D6 inhibitors should be avoided in tamoxifen-treated women.

[PMID 1782973] Codeine is ineffective at typical doses in up to 10% of Caucasians carrying two nonfunctional CYP2D6 alleles.

[PMID 16638864] SNPs in LIG4, ERCC2, and CYP2D6 genes were identified as putative markers predicting individuals at risk for complications arising from radiation therapy in Prostate cancer.

[PMID 9012401] Presents a tabulation of allele frequences and phenotypic consequences in a European population.

[PMID 18070221] CYP2D6*4 homozygotes should have lower doses of tricyclic antidepressants.

[PMID 16958828] CYP2D6 poor metabolizers (*4, *5, *6 alleles) have more side effects when taking antidepressants, in particular, venlafaxine (Effexor)

[PMID 18784654] CYP2D6*4 homozygotes taking a beta blocker like metoprolol are at 4x increased risk for bradycardia

[PMID 19541866] a paper on CYP2D6 CNV profiling in a chinese population.

In late 2004, the FDA approved the AmpliChip CYP450, a dedicated microarray test from Roche which allows the automated determination of a patient's CYP2D6 and CYP2C19 genotype.

In 2006 the FDA recommended an update in the tamoxifen label to reflect the increased risk of recurrence in breast cancer patients who are CYP2D6 poor metabolizers; a 2009 review of several studies since then mostly confirms worse clinical outcome in patients with decreased CYP2D6 metabolism and supports the notion that CYP2D6 genotype may well become a clinically relevant predictive marker.[PMID 19118028]

A more complete list of CYP2D6 variants includes:

Allele Name Code Defining Name/Change Rs# Comments Enzyme Activity Platforms
CYP2D6*1 Wild-type normal
CYP2D6*2 2850C>T, 4180G>C (but these also appear in other variants) rs16947(A) rs1135840(C) R296C, S486T; has several subvariants normal (except *2XN subvariant) 23andMe v2, HumanOmni1Quad, 23andMe v4;23andMe v2, 23andMe v3, 23andMe v4
CYP2D6*2XN 1661G>C, 2850C>T, 4180G>C with multiple copies rs16947(A) rs1135840(C) more than one copy of *2 variant in chromosome, N replaced by copy number increased 23andMe v2, HumanOmni1Quad, 23andMe v4;23andMe v2, 23andMe v3, 23andMe v4
CYP2D6*3A 2549delA rs35742686(-) 259frameshift none
CYP2D6*3B 1749A>G, 2549delA rs1135824(G) rs35742686(-) N166D; 259frameshift none 23andMe v2, 23andMe v3, 23andMe v4;
CYP2D6*4 1846G>A rs3892097(A) splicing defect; has several subvariants none 23andMe v3, HumanOmni1Quad
CYP2D6*4F 1846G>A, 1858C>T rs3892097(A) i4001456(A) splicing defect, R173C none 23andMe v3, HumanOmni1Quad;23andMe v2, 23andMe v3, 23andMe v4
CYP2D6*4G 1846G>A, 2938C>T rs3892097(A) i4001467(A) splicing defect, P325L none 23andMe v3, HumanOmni1Quad;23andMe v2, 23andMe v3, 23andMe v4
CYP2D6*4H 1846G>A, 3877G>C rs3892097(A) rs28371733(C) splicing defect, E418Q none 23andMe v3, HumanOmni1Quad;23andMe v1, 23andMe v2, 23andMe v3, 23andMe v4
CYP2D6*5 whole-gene deletion CYP2D6 gene deleted none
CYP2D6*6 1707delT rs5030655 118frameshift none 23andMe v1, 23andMe v2, 23andMe v3, 23andMe v4
CYP2D6*7 2935A>C rs5030867 H324P none 23andMe v2, 23andMe v3, 23andMe v4
CYP2D6*8 1758G>T rs5030865 G169X none 23andMe v2, 23andMe v3
CYP2D6*9 2615-2617delAAG rs5030656 K281del decreased 23andMe v1, 23andMe v2, 23andMe v3, 23andMe v4
CYP2D6*10 100C>T (but also appears in other variants) rs1065852 P34S decreased 23andMe v2, 23andMe v3, HumanOmni1Quad, 23andMe v4
CYP2D6*11 883G>C rs5030863 none
CYP2D6*12 124G>A rs5030862 G42R none 23andMe v2, 23andMe v3, HumanOmni1Quad, Illumina Human 1M, 23andMe v4
CYP2D6*14 1758G>A rs5030865 G169R none 23andMe v2, 23andMe v3
CYP2D6*15 137insT; 137_138insT in-del; 46 frameshift none
CYP2D6*17 1023C>T, 2850C>T (but also appear in other variants) rs28371706(T) rs16947(A) T107I, R296C decreased 23andMe v1, 23andMe v2, 23andMe v3, FTDNA2, FamilyTreeDNA, 23andMe v4;23andMe v2, HumanOmni1Quad, 23andMe v4
CYP2D6*18 4133dupGTGCCCACT 468_470dupVPT none
CYP2D6*19 2539_2542delAACT 255frameshift none
CYP2D6*20 1973_1974insG i4001479(CC) 211frameshift none 23andMe v2, 23andMe v3, 23andMe v4
CYP2D6*21 2573insC none
CYP2D6*29 1659G>A; 1661G>C; 2850C>T; 3183G>A; 4180G>C V136M; R296C; V338M; S486T decreased
CYP2D6*38 2587_2590delGACT 271Frameshift none
CYP2D6*39 1661G>C, 4180G>C rs1135840 S486T normal 23andMe v2, 23andMe v3, 23andMe v4
CYP2D6*40 1863_1864ins(TTT CGC CCC)2 174_175ins(FRP)2 none
CYP2D6*41 2988G>A rs28371725 aberrant splicing decreased 23andMe v2, 23andMe v3, HumanOmni1Quad, 23andMe v4
CYP2D6*42 3259insGT; 3259_3260insGT 365frameshift none
CYP2D6*44 2950G>C splicing defect none
CYP2D6*52 3877G>A rs28371733(A) E418K possibly decreased 23andMe v1, 23andMe v2, 23andMe v3, 23andMe v4
CYP2D6*56 3201C>T R344X none
CYP2D6*1xN whole-gene duplication Nx active genes increased
CYP2D6*4xN whole-gene duplication (+1846G>A) Nx inactive genes none
CYP2D6*10xN whole-gene duplication (+100C>T) Nx decreased-activity genes decreased
CYP2D6*41xN whole-gene duplication (+2988G>A) Nx decreased- activity genes decreased
CYP2D6_(rs1080983) rs1080983 23andMe v1, 23andMe v2, 23andMe v3, 23andMe v4
CYP2D6_(rs28360521) rs28360521

source1 and source2