title: Prevalence of CYP2B6 polymorphisms in Argentinians: the role of genetic testing.
abstract: CYP2B6 is a highly polymorphic isoenzyme involved in the metabolism of many drugs including cyclophosphamide, bupropion, and efavirenz. A single nucleotide polymorphism (SNP) in CYP2B6 (516G>T) resulted in decreased expression and function associated with the CYP2B6*6 haplotype. Among the clinical implications of this phenotype, decreased activation of cyclophosphamide and increased plasma levels of efavirenz associated with increased central nervous system toxicity have been reported. The frequency of the CYP2B6 (516G>T) SNP has been studied in several different populations, but there is no data regarding distribution among Argentinians. In this study, 102 DNA samples from healthy volunteers were analyzed using a polymerase chain reaction-restriction fragment length polymorphism reaction specific for the CYP2B6 (516G>T) SNP. Our results showed a prevalence of 71.08% for the G allele and 28.92% for the T allele. This was distributed as 52.9% for the GG genotype (reduced dosage required), 36.6% for the GT genotype (normal dosage range), and 10.8% for the TT genotype (high drug toxicity). There was no preferential gender distribution observed. The relatively high prevalence of the TT genotype in our population supports the clinical use of genotyping as an additional tool in personalized medicine.
authors.affiliation: Clinical Pharmacology Section, Internal Medicine Service, Hospital Italiano de Buenos Aires, Buenos Aires, Argentina.|Instituto de Ciencias Básicas y Medicina Experimental, Hospital Italiano de Buenos Aires, Buenos Aires, Argentina.
authors.forename: P
authors.initials: P
authors.lastname: Scibona
authors.affiliation: Clinical Pharmacology Section, Internal Medicine Service, Hospital Italiano de Buenos Aires, Buenos Aires, Argentina.
authors.forename: C
authors.initials: C
authors.lastname: Vazquez
authors.affiliation: Instituto de Ciencias Básicas y Medicina Experimental, Hospital Italiano de Buenos Aires, Buenos Aires, Argentina.
authors.forename: A R
authors.initials: AR
authors.lastname: Cajal
authors.affiliation: Instituto de Ciencias Básicas y Medicina Experimental, Hospital Italiano de Buenos Aires, Buenos Aires, Argentina.
authors.forename: P F
authors.initials: PF
authors.lastname: Argibay
authors.affiliation: Clinical Pharmacology Section, Internal Medicine Service, Hospital Italiano de Buenos Aires, Buenos Aires, Argentina.
authors.forename: W H
authors.initials: WH
authors.lastname: Belloso
mesh_terms: D000480:Alkynes; D000483:Alleles; D001118:Argentina; D048588:Benzoxazines / Q000009:adverse effects; D003521:Cyclopropanes; D065702:Cytochrome P-450 CYP2B6 / Q000235:genetics*; D065695:Cytochrome P-450 CYP2B6 Inducers / Q000009:adverse effects; D005260:Female; D005820:Genetic Testing; D006239:Haplotypes; D006801:Humans; D008297:Male; D020641:Polymorphism, Single Nucleotide
chemical_list: D000480:Alkynes; D048588:Benzoxazines; D003521:Cyclopropanes; D065695:Cytochrome P-450 CYP2B6 Inducers; C585599:CYP2B6 protein, human; D065702:Cytochrome P-450 CYP2B6; C098320:efavirenz