Hereditary hemochromatosis: Mutations in genes involved in iron homeostasis in Brazilian patients

Autor(es):Mostrar menos -

Santos, Paulo C. J. L. ^[1] ; Cancado, Rodolfo D. ^[2] ; Pereira, Alexandre C. ^[3] ; Schettert, Isolmar T. ^{[4, 3]} ; Soares, Renata A. G. ^[3] ; Pagliusi, Regina A. ^[5] ; Hirata, Rosario D. C. ^[1] ; Hirata, Mario H. ^[1] ; Teixeira, Ana C. ^[1] ; Figueiredo, Maria Stella ^[6] ; Chiattone, Carlos S. ^[2] ; Krieger, Jose E. ^[3] ; Guerra-Shinohara, Elvira M. ^[1]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Sch Pharmaceut Sci, Dept Clin Chem & Toxicology, BR-05508 Sao Paulo - Brazil

^[2] Santa Casa Med Sch, Sao Paulo - Brazil

^[3] Univ Sao Paulo, Sch Med, Heart Inst InCor, Lab Genet & Mol Cardiol, BR-05508 Sao Paulo - Brazil

^[4] Novo Atibaia Hosp, Atibaia, SP - Brazil

^[5] Adolfo Lutz Inst, Sao Jose Do Rio Preto - Brazil

^[6] Univ Fed Sao Paulo, EPM, Sao Paulo - Brazil

• Tipo de documento: Artigo Científico
• Fonte: BLOOD CELLS MOLECULES AND DISEASES; v. 46, n. 4, p. 302-307, APR 15 2011.
• Citações Web of Science: 27

Resumo

Background: p.C282Y mutation and rare variants in the HFE gene have been associated with hereditary hemochromatosis (HH). HH is also caused by mutations in other genes, such as the hemojuvelin (HJV), hepcidin (HAMP), transferrin receptor 2 (TFR2) and ferroportin (SLC40A1). The low rate homozygous p.C282Y mutation in Brazil is suggestive that mutations in non-HFE genes may be linked to HH phenotype. Aim: To screen exon-by-exon DNA sequences of HFE, HJV, HAMP, TFR2 and SLC40A1 genes to characterize the molecular basis of HH in a sample of the Brazilian population. Materials and methods: Fifty-one patients with primary iron overload (transferrin saturation >= 50% in females and >= 60% in males) were selected. Subsequent bidirectional DNA sequencing of HFE, HJV, HAMP, TFR2 and SLC40A1 exons was performed. Results: Thirty-seven (72.5%) out of the 51 patients presented at least one HFE mutation. The most frequent genotype associated with HH was the homozygous p.C282Y mutation (n = 11, 21.6%). In addition, heterozygous HFE p.S65C mutation was found in combination with p.H63D in two patients and homozygous HFE p.H63D was found in two patients as well. Sequencing in the HJV and HAMP genes revealed HJV p.E302K, HJV p.A310G, HJV p.G320V and HAMP p.R59G alterations. Molecular and clinical diagnosis of juvenile hemochromatosis (homozygous form for the HJV p.G320V) was described for the first time in Brazil. Three TFR2 polymorphisms (p.A75V, p.A617A and p.R752H) and six SLC40A1 polymorphisms (rs13008848, rs11568351, rs11568345, rs11568344, rs2304704, rs11568346) and the novel mutation SLC40A1 p.G204S were also found. Conclusions: The HE p.C282Y in homozygosity or in heterozygosity with p.H63D was the most frequent mutation associated with HH in this sample. The HJV p.E302K and HAMP p.R59G variants, and the novel SLC40A1 p.G2045 mutation may also be linked to primary iron overload but their role in the pathophysiology of HH remain to be elucidated. (C) 2011 Elsevier Inc. All rights reserved. (AU)

• Processo FAPESP: 08/54131-0 - Pesquisa de mutações em genes relacionados à hemocromatose hereditária (HFE, HJV, HAMP, TFR2 e SLC40A1) em pacientes portadores de sobrecarga de ferro
• Beneficiário: Elvira Maria Guerra Shinohara
• Modalidade de apoio: Auxílio à Pesquisa - Regular