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Inherited iron overload
1Department of Medicine, University of Queensland, Royal Brisbane Hospital, Australia.
Insights
Hereditary hemochromatosis (HC) is an inherited iron overload disorder. Early diagnosis in relatives and treatment before cirrhosis offers an excellent prognosis, making this disease preventable.
Area of Science:
- Genetics and Medicine
- Hereditary Diseases
- Iron Metabolism Disorders
Background:
- Hereditary hemochromatosis (HC) is an inherited iron overload disorder.
- Traditionally viewed as a disease of adulthood, HC is increasingly diagnosed in younger individuals, including relatives of affected patients.
- Early detection and intervention are crucial for preventing severe complications.
Purpose of the Study:
- To highlight the inherited nature of hemochromatosis.
- To emphasize the importance of early diagnosis and treatment.
- To discuss the spectrum of HC, from adult-onset to rare juvenile and neonatal forms.
Main Methods:
- Utilizing serum iron, transferrin saturation, and serum ferritin levels for early detection.
- Confirming diagnosis with liver biopsy and hepatic iron concentration.
- Observing clinical presentations in different age groups.
Main Results:
- Early detection of iron overload in a precirrhotic stage is possible using blood tests.
- Adequate iron removal before cirrhosis develops leads to an excellent prognosis.
- Juvenile and neonatal forms of severe iron overload present with cardiac and endocrine issues, often with fatal outcomes.
Conclusions:
- Hemochromatosis can be prevented in many cases through early recognition and treatment.
- The relationship between adult, juvenile, and neonatal forms of HC requires further investigation, potentially aided by gene identification.
- Screening first-degree relatives of HC patients is essential due to the inherited risk.
Abstract:
Several inherited forms of iron overload have been described. It is now accepted that HC, usually regarded as a disease of adult life, is an inherited disorder, hence all first degree relatives must be presumed to be at increased risk of developing iron overload and the diagnosis is now frequently made in young relatives. The combination of serum iron, transferrin saturation and serum ferritin determination will detect iron overload in an early, precirrhotic stage. Liver biopsy and the determination of hepatic iron concentration provide the definitive proof. Where HC is recognized sufficiently early to permit adequate removal of iron before cirrhosis has developed, the prognosis is excellent. Thus haemochromatosis as a clinical disease should be preventable in a large proportion of patients. Severe iron overload has been described in juveniles and also in neonates. These conditions are familial but whether they are HLA-related has not been determined. Cardiac and endocrine disorders are frequently the presenting manifestations of parenchymal iron overload in the young and, at least in neonates, the condition is usually fatal in early infancy. It is not possible at present, to say whether these rare juvenile and neonatal forms of haemochromatosis are related to the much more common adult form. Identification of the gene for HC may assist in answering this question.