An unequal cross-over event within the CYP2D gene cluster generates a chimeric CYP2D7/CYP2D6 gene which is associated with the poor metabolizer phenotype.

Article Details

Citation

Panserat S, Mura C, Gerard N, Vincent-Viry M, Galteau MM, Jacoz-Aigrain E, Krishnamoorthy R

An unequal cross-over event within the CYP2D gene cluster generates a chimeric CYP2D7/CYP2D6 gene which is associated with the poor metabolizer phenotype.

Br J Clin Pharmacol. 1995 Oct;40(4):361-7.

PubMed ID
8554938 [ View in PubMed
]
Abstract

1. The study of the CYP2D genotype and phenotype of a Caucasian family revealed that a XbaI-9 kb allele was associated with the poor metabolizer phenotype. 2. A Polymerase Chain Reaction (PCR)-based assay showed that the previously described mutations D6A and D6B are not associated with the XbaI-9 kb allele. 3. To explore the molecular basis of the poor metabolizer phenotype associated with the XbaI-9 kb allele, complete sequencing of the nine exons and intron-exon boundaries of the CYP2D6 gene was undertaken after amplification by PCR. 4. All the exons were successfully amplified using CYP2D6 gene-specific primers except exon 1 which required a combination of CYP2D7 gene-specific 5' primer and a CYP2D6 gene-specific 3' primer. 5. Sequence data derived from this amplified product revealed that the XbaI-9 kb allele corresponds to a novel rearrangement of the locus. This involved a deletion of an approximately 20 kilobase (kb) DNA segment generating a hybrid 5' CYP2D7/CYP2D6 3' gene. 6. The chimeric gene is non-functional presumably due to an insertion in exon 1 (characteristic of the exon 1 of the CYP2D7 gene) which causes a shift in the reading frame with premature termination of translation.

DrugBank Data that Cites this Article

Pharmaco-genomics
DrugInteracting Gene/EnzymeAllele nameGenotypesDefining change(s)Type(s)DescriptionDetails
MetoprololCytochrome P450 2D6
Gene symbol: CYP2D6
UniProt: P10635
CYP2D6*13Not Available
  • CYP2D7/2D6 hybrid gene structure
ADR InferredIncreased risk of slow heart rate (bradycardia)Details
VenlafaxineCytochrome P450 2D6
Gene symbol: CYP2D6
UniProt: P10635
CYP2D6*13Not Available
  • CYP2D7/2D6 hybrid gene structure
Effect InferredPoor drug metabolizer, lower dose requirements, nausea, vomiting and diarrheaDetails
CodeineCytochrome P450 2D6
Gene symbol: CYP2D6
UniProt: P10635
CYP2D6*13Not Available
  • CYP2D7/2D6 hybrid gene structure
Effect InferredPoor drug metabolizer, lower dose requirementsDetails
AmitriptylineCytochrome P450 2D6
Gene symbol: CYP2D6
UniProt: P10635
CYP2D6*13Not Available
  • CYP2D7/2D6 hybrid gene structure
Effect InferredPoor drug metabolizer, lower dose requirements, higher risk for adverse side effectsDetails
ImipramineCytochrome P450 2D6
Gene symbol: CYP2D6
UniProt: P10635
CYP2D6*13Not Available
  • CYP2D7/2D6 hybrid gene structure
Effect InferredPoor drug metabolizer, lower dose requirements, higher risk for adverse side effectsDetails
DextromethorphanCytochrome P450 2D6
Gene symbol: CYP2D6
UniProt: P10635
CYP2D6*13Not Available
  • CYP2D7/2D6 hybrid gene structure
Effect InferredPoor drug metabolizer, lower dose requirementsDetails
NortriptylineCytochrome P450 2D6
Gene symbol: CYP2D6
UniProt: P10635
CYP2D6*13Not Available
  • CYP2D7/2D6 hybrid gene structure
Effect InferredPoor drug metabolizer, lower dose requirements, higher risk for adverse side effectsDetails
TamoxifenCytochrome P450 2D6
Gene symbol: CYP2D6
UniProt: P10635
CYP2D6*13Not Available
  • CYP2D7/2D6 hybrid gene structure
Effect InferredPoor response to drug treatment, shorter time to relapseDetails
DesipramineCytochrome P450 2D6
Gene symbol: CYP2D6
UniProt: P10635
CYP2D6*13Not Available
  • CYP2D7/2D6 hybrid gene structure
Effect InferredPoor drug metabolizer, lower dose requirements, higher risk for adverse side effectsDetails
ClomipramineCytochrome P450 2D6
Gene symbol: CYP2D6
UniProt: P10635
CYP2D6*13Not Available
  • CYP2D7/2D6 hybrid gene structure
Effect InferredPoor drug metabolizer, lower dose requirements, higher risk for adverse side effectsDetails
AtomoxetineCytochrome P450 2D6
Gene symbol: CYP2D6
UniProt: P10635
CYP2D6*13Not Available
  • CYP2D7/2D6 hybrid gene structure
Effect InferredPoor drug metabolizer, increased side effects.Details