TFR2-related hereditary hemochromatosis as a frequent cause of primary iron overload in patients from Central-Southern Italy

详细信息    查看全文

• 作者：Francesca Clementina Radio ; Silvia Majore ; Francesco Binni ; Michele Valiante ; Bianca Maria Ricerca ; Carmelilia De Bernardo ; Aldo Morrone ; Paola Grammatico
• 关键词：TFR2 ; Hereditary hemochromatosis ; Iron overload ; Mediterranean area ; Novel mutations ; Non-HFE hereditary hemochromatosis
• 刊名：Blood Cells, Molecules, and Diseases
• 出版年：February-March, 2014
• 年：2014
• 卷：52
• 期：2-3
• 页码：83-87
• 全文大小：434 K

文摘

Objective

Hereditary hemochromatosis (HH) is a common Mendelian disorder of iron metabolism. Eighty percent of northern Europeans descendant HH patients carry the same mutation (p.C282Y) in the HFE gene. Simultaneously, due to a founder effect, its frequency varies considerably between different populations. In Central-Southern Italy the prevalence of p.C282Y mutation is low and in several patients the disease has different causes. Four additional rarer forms have been described. Type 3 HH has been reported in about 50 families and no more than 30 TFR2 pathogenic mutations have been globally identified. The aim of this study is to assess the TFR2 role in non-HFE HH pathogenesis.

Study design and setting

TFR2 sequence analysis was performed on 45 Italian patients without HFE mutations.

Results

This study revealed TFR2 biallelic pathogenic mutations in 7/45 (15.6%) individuals. Moreover monoallelic TFR2 deleterious defects (18%) or polymorphisms with unclear meaning (36%) were identified. Besides, we recognized 10 novel variants and 9 described changes.

Conclusion

We believe this to be the largest series of type 3 HH patients described so far. Present findings support the hypothesis of a main role of the TFR2 gene in HH pathogenesis in those regions, such as Central-Southern Italy, where the p.C282Y frequency is low.