A novel (Leu183Pro-)mutation in the HFE-gene co-inherited with the Cys282Tyr mutation in two unrelated Dutch hemochromatosis patients.
We describe a novel heterozygous mutation in exon 3 of the HFE-gene that was co-inherited with Cys282Tyr in two unrelated Dutch men both presenting a classical form of hereditary hemochromatosis. Heterozygosity for this mutation was also found in one out of 100 healthy controls of Dutch descent. This c.548T>C mutation converts a leucine to a proline residue at position 183 in the alpha2-helix of the HFE-protein (Leu183Pro). Standard bioinformatics analysis shows that the mutation is likely to disturb the HFE interaction with TfR1. This disrupting role of the mutation in the iron regulatory pathway is further corroborated by the familial co-occurrence of the observed compound heterozygosity with increased serum iron parameters. Haplotype analysis strongly suggests that this novel mutation arose from a common ancestor in the distant past. These findings may have implications for HFE-testing of iron overloaded heterozygous Cys282Tyr-patients of Northern European origin and their relatives.
Department of Clinical Chemistry, Radboud University Nijmegen Medical Centre, Nijmegen, The Netherlands. D.Swinkels@akc.umcn.nl
Dorine W
DW
Swinkels
Hanka
H
Venselaar
Erwin T
ET
Wiegerinck
Egbert
E
Bakker
Irma
I
Joosten
Christian A J J
CA
Jaspers
Wies L
WL
Vasmel
Martijn H
MH
Breuning
D000328:Adult; D005091:Exons / Q000235:genetics; D006239:Haplotypes / Q000235:genetics; D006432:Hemochromatosis / Q000235:genetics*; D000071020:Hemochromatosis Protein; D006579:Heterozygote; D015395:Histocompatibility Antigens Class I / Q000737:chemistry / Q000235:genetics* / Q000378:metabolism; D006801:Humans; D007501:Iron / Q000378:metabolism; D008297:Male; D008565:Membrane Proteins / Q000737:chemistry / Q000235:genetics* / Q000378:metabolism; D009154:Mutation; D009426:Netherlands
C103673:HFE protein, human; D000071020:Hemochromatosis Protein; D015395:Histocompatibility Antigens Class I; D008565:Membrane Proteins; D007501:Iron