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Hum Mutat ; 29(1): 206, 2008 Jan.
Article in English | MEDLINE | ID: mdl-18157833

ABSTRACT

Most adults affected with HFE hereditary hemochromatosis (HH type 1, MIMmusical sharp 235200) are homozygous for the p.Cys282Tyr mutation in HFE (NC_000006.10, region 26195427 to 26205038). The aim of this study was to investigate the molecular basis of iron overload in a patient presenting with severe clinical HH with one c.845G>A (p.Cys282Tyr) allele only. Molecular and pedigree studies demonstrated the presence of the c.845G>A (p.Cys282Tyr) mutation in one allele whereas the other carried the c.187C>G (p.His63Asp) mutation plus a new c.128G>A (p.Gly43Asp) substitution in cis. A molecular modeling study of the p.[Gly43Asp;His63Asp] and p.His63Asp variants versus the wild type was carried out using molecular dynamics (MD) simulation in presence of implicit solvent. We found that the c.187C>G (p.His63Asp) mutation does not introduce any major change in the 1- domains of HFE whereas the c.128G>A (p.Gly43Asp) substitution is responsible for a modification of the dynamics and the structure of the Gln40-Ser45 loop, a critical region for HFE-TfR1 interaction thus impairing HFE-TfR1 normal contact. We conclude that the occurrence of complex alleles may be an alternative explanation for the variability of the phenotype in individuals who are compound heterozygous for c.[187C>G]+[845G>A] (p.[His63Asp]+[Cys282Tyr]).


Subject(s)
Amino Acid Substitution , Antigens, CD/metabolism , Hemochromatosis/genetics , Heterozygote , Histocompatibility Antigens Class I/chemistry , Histocompatibility Antigens Class I/genetics , Membrane Proteins/chemistry , Membrane Proteins/genetics , Receptors, Transferrin/metabolism , Alleles , Amino Acids/genetics , Binding Sites , Hemochromatosis/metabolism , Hemochromatosis Protein , Histocompatibility Antigens Class I/metabolism , Humans , Male , Membrane Proteins/metabolism , Middle Aged , Models, Molecular , Mutation, Missense , Pedigree , Structure-Activity Relationship
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