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Haemochromatosis: novel gene discovery and the molecular pathophysiology of iron metabolism Griffiths W; Cox THum Mol Genet 2000[Oct]; 9 (16): 2377-82The application of molecular genetics to haemochromatosis and experimental mutagenesis in animals has transformed our capacity to investigate the unique physiology of iron homeostasis-a key problem in biology and medicine. The identification of HFE, the principal determinant of adult haemochromatosis (HFE1; OMIM 235200) and TfR2, recently implicated in a rarer form of the inherited disorder (HFE3; OMIM 604250), and the promise of candidate genes for juvenile haemochromatosis (HFE2; OMIM 602390) and neonatal haemochromatosis (OMIM 231100) provide the foundation for important studies into the control mechanism of iron balance in humans. The rare conditions atransferrinaemia (OMIM 209300) and acaeruloplasminaemia (OMIM 604290), each associated with tissue iron overload, have already implicated the iron transport ligand transferrin and the copper transporter caeruloplasmin in the control of iron homeostasis. Gene mapping studies in animal mutants with anaemia due to defects in the uptake or tissue transfer of iron have yielded novel proteins involved in iron transport: DMT1 (brush border transporter of ferrous iron) in the mk/mk mouse, hephaestin (basolateral multi-copper ferroxidase) in the sex-linked anaemic mouse (sla) and ferroportin1 (basolateral iron exporter) in zebrafish weh mutants. The discovery of genes that determine heritable defects of iron absorption and regulation in animals and humans thus holds promise for a complete mechanistic understanding of the molecular pathophysiology of iron metabolism.|Forecasting[MESH]|Hemochromatosis/*genetics[MESH]|Humans[MESH]|Intestinal Mucosa/metabolism[MESH]|Iron/*metabolism[MESH] |
