Transferrin receptor 2 (TfR2) and HFE mutational analysis in non-C282Y iron overload: identification of a novel TfR2 mutation.
Hereditary hemochromatosis (HH) is classically associated with a Cys282Tyr (C282Y) mutation of the HFE gene. Non-C282Y HH is a heterogeneous group accounting for 15% of HH in Northern Europe. Pathogenic mutations of the transferrin receptor 2 (TfR2) gene have been identified in 4 Italian pedigrees with the latter syndrome. The goal of this study was to perform a mutational analysis of the TfR2 and HFE genes in a cohort of non-C282Y iron overload patients of mixed ethnic backgrounds. Several sequence variants were identified within the TfR2 gene, including a homozygous missense change in exon 17, c2069 A-->C, which changes a glutamine to a proline residue at position 690. This putative mutation was found in a severely affected Portuguese man and 2 family members with the same genotype. In summary, pathologic TfR2 mutations are present outside of Italy, accounting for a small proportion of non-C282Y HH.
Genes, Elements, and Metabolism Program, Children and Women's Hospital of British Columbia, Vancouver, British Columbia, Canada.
Andre
A
Mattman
David
D
Huntsman
Gillian
G
Lockitch
Sylvie
S
Langlois
Noel
N
Buskard
Diana
D
Ralston
Yaron
Y
Butterfield
Pedro
P
Rodrigues
Steven
S
Jones
Graça
G
Porto
Marco
M
Marra
Maria
M
De Sousa
Greg
G
Vatcher
D002170:Canada / Q000453:epidemiology; D004252:DNA Mutational Analysis; D005192:Family Health; D005260:Female; D020022:Genetic Predisposition to Disease; D005838:Genotype; D006680:HLA Antigens / Q000235:genetics*; D006432:Hemochromatosis / Q000235:genetics*; D000071020:Hemochromatosis Protein; D015395:Histocompatibility Antigens Class I / Q000235:genetics*; D006801:Humans; D019190:Iron Overload / Q000235:genetics*; D008297:Male; D008565:Membrane Proteins; D010375:Pedigree; D011990:Receptors, Transferrin / Q000235:genetics*
C103673:HFE protein, human; D006680:HLA Antigens; D000071020:Hemochromatosis Protein; D015395:Histocompatibility Antigens Class I; D008565:Membrane Proteins; D011990:Receptors, Transferrin; C503640:TFR2 protein, human