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Association of allelic variants of genes of detoxification system with clinical presentation of acute intermittent porphyria


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Acute intermittent porphyria (AIP) is caused by the partial deficiency of porphobilinogen deaminase (PBGD), one of the enzymes of the heme biosynthetic pathway. The penetrance of the mutant gene PBGD is not high and averages of 10-15%. Any additional genetic factors, the combination of which with the mutant allele of the PBGD gene leads to the clinical manifestation of AIP is not currently known. The eventual associations of allelic variants of genes of the Phase 1: CYP1A1 (A2455G), CYP2E1 (G1259C) and four genes of the phase 2: NAT2 (C481T, G590A G857A), mEPHX1: Tyr113His - 3rd exon, His139Arg - 4th exon, GSTM1 (Del), GSTT1 (Del) with clinical presentation of AIP were investigated. Homozygous carriership of the "fast" allele of the acetyltransferase gene (genotype N/N) was established to be associated with a latent course of the disease. The combination of "functionally weakened" genotypes of glutathione transferase (class t~) and class M (GSTT10/0, GSTM10/0) can be considered as an unfavorable genetic factor related with the clinical presentation of AIP. Comparative analysis of the frequencies of genotypes and polymorphic alleles of genes CYP1A1, CYP2E1 and mEPHX1 revealed no statistically significant differences between the samples of patients with AIP and asymptomatic carriers of the disease.

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