Polymorphisms in the hypoxia inducible factor-1alpha gene (HIF1A) are associated with the renal cell carcinoma phenotype

Cancer Genetics and Cytogenetics
Martin OllerenshawAndrew Demaine

Abstract

Hypoxia inducible factor 1 (HIF-1) is a key regulator of the genes involved in the cellular response to hypoxia. HIF consists of alpha and beta subunits, with the alpha subunit being degraded under normoxic conditions and stabilized under hypoxia. We investigated C1772T and G1790A polymorphisms in exon 12 of the HIF gene, which result in an amino acid change from proline 582 to serine and from alanine 588 to threonine, respectively. These polymorphisms are found within the oxygen-dependent degradation domain of the HIF-1alpha protein and may be important in the oxygen regulation of the protein via hydroxylation of the proline residue at position 564 (P564) by HIF-alpha prolyl hydroxylase (HIF-PH). The frequency of these polymorphisms was studied in 160 nontumor DNA samples from patients with renal cell carcinoma (RCC). There was a highly significant increase in the frequency of both the G/A1790 (45.9 vs. 13.5%, P < 0.00001) and C/C1772 (10 vs. 0.7%, P=0.0004) genotypes in patients with RCC compared with normal healthy controls. A decrease was seen for the GG (44.5 vs. 83%, P < 0.00001) and CT (33.8 vs. 55.5%, P=0.0001) genotypes in patients compared with controls. There was a marked increase in the T-A haplotype (22.8 vs. 9.5%,...Continue Reading

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