RESUMO
Ferritin is an acute-phase reactant that is elevated in the course of infectious, inflammatory, autoimmune, and oncological diseases and the hemophagocytic syndrome. In asymptomatic patients, isolated hyperferritinemia may be due to different causes depending on whether or not it is accompanied by iron overload. Hyperferritinemia values above 300 ng/ml and an excess of body iron levels may be indicative of hemochromatosis. However, if such values develop in the absence of iron overload, they may be secondary to hemochromatosis type 4a (ferroportin disease) or more often to hereditary hyperferritinemia-cataract syndrome (HHCS; Aguilar-Martinez et al., Am J Gastroenterol 100:1185-1194, 2005; Ferrante et al., Eur J Gastroenterol Hepatol 17:1247-1253, 2005). HHCS results from different mutations in the L-ferritin gene (FTL) on chromosome 19 (19q13.1), causing autosomal dominant transmission (Bertola et al., Curr Drug Targets Immune Endocr Metabol Disord 4:93-105, 2004). We present a child with HHCS due to the allelic variant c.-167C>T (C33T) in the iron-responsive element region of the FTL gene. When pediatricians encounter an asymptomatic patient with isolated hyperferritinemia in the absence of iron overload, they should consider the possibility of HHCS, especially if other members of the family have developed cataracts from a young age.
Assuntos
Apoferritinas/genética , Proteínas Reguladoras de Ferro/genética , Ferro/metabolismo , Fatores Etários , Catarata/congênito , Catarata/diagnóstico , Catarata/genética , Catarata/fisiopatologia , Pré-Escolar , Cromossomos Humanos Par 19/genética , Diagnóstico Diferencial , Família , Humanos , Distúrbios do Metabolismo do Ferro/congênito , Distúrbios do Metabolismo do Ferro/diagnóstico , Distúrbios do Metabolismo do Ferro/genética , Distúrbios do Metabolismo do Ferro/fisiopatologia , Masculino , Mutação , Linhagem , Análise de Sequência de DNARESUMO
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