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We evaluated more than 450 patients with thrombophilia or iron overload for the presence of a factor V Leiden (R506Q), prothrombin G20210A, or HFE C282Y mutation using a standard method (polymerase chain reaction [PCR]-restriction fragment length polymorphism) and a comparative real-time PCR fluorescent resonance energy transfer (FRET) hybridization probe melting curve method. There was 100% concordance between the genotypes ascertained by the 2 methods (at each loci). In addition, phenotypic biochemical laboratory parameters measured on a subset of referred patients correlated with their respective genotypes. In the iron overload cohort, HFE C282Y homozygotes (n = 74) had significantly higher (P &lt; .0001) transferrin saturation levels (74% +/- 25%) than did nonhomozygotes (n = 340; 51.4% +/- 28%), suggesting a genotype-dependent increase in body iron loads. In the thrombophilic cohort, the degree of activated protein C resistance (APCR), measured by a clotting time-based test, was associated significantly with the presence of 0 (n = 255; APCR = 2.59 +/- 0.26), 1 (n = 84; APCR = 1.61 +/- 0.13), or 2 (n = 5; APCR = 1.16 +/- 0.04) copies of the mutant factor V Leiden allele. As the fluorescent genotyping method required no postamplification manipulation, genotypes could be determined more quickly and with minimized risk of handling errors or amplicon contamination. In addition to these practical advantages, the FRET method is diagnostically accurate and clinically predictive of phenotypic, disease-associated manifestations.

american journal of clinical pathology

Real-Time Polymerase Chain Reaction With Fluorescent Hybridization Probes for the Detection of Prevalent Mutations Causing Common Thrombophilic and Iron Overload Phenotypes