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Published on: August 15, 2019
Inherited metabolic diseases affecting the carrier
1University Children's Hospital, Innsbruck, Austria.
Journal of Inherited Metabolic Disease
|March 1, 1997
Summary
Inherited metabolic disorders can harm carriers, not just affected individuals. This review highlights risks for carriers and outlines preventive strategies for conditions like homocystinuria and phenylketonuria.
Area of Science:
- Genetics
- Metabolic Disorders
- Preventive Medicine
Background:
- Inherited metabolic traits can pose risks not only to homozygous individuals but also to heterozygous carriers.
- Identifying and managing these risks is crucial for carrier health and reproductive outcomes.
Purpose of the Study:
- To review inherited metabolic traits that are potentially harmful to carriers.
- To outline preventive measures for obligate heterozygotes, particularly parents of affected children.
Main Methods:
- Literature review of inherited metabolic disorders.
- Analysis of clinical features and potential health risks in carriers.
- Identification of preventive strategies for specific carrier states.
Main Results:
- Identified food-dependent abnormalities with carrier risks: homocystinuria (vascular disease), ornithine transcarbamylase deficiency (hyperammonaemia), galactosaemia/galactokinase deficiency (cataracts), X-linked adrenoleukodystrophy (spastic paraparesis), and Long-chain 3-hydroxyacyl-coenzyme A dehydrogenase deficiency (HELLP syndrome).
- Identified food-independent disorders with carrier risks: Fabry disease (paresthesias, corneal dystrophy), Lowe syndrome (lens clouding), alpha 1-antitrypsin deficiency (lung/liver disease), and cystinuria (renal stones).
- Highlighted risks for pregnant carriers of galactosaemia and phenylketonuria due to fetal impact.
Conclusions:
- Preventive measures are feasible for several carrier states.
- Recommendations include dietary modifications (lactose restriction, monounsaturated fatty acids), lifestyle changes (avoiding smoking/alcohol, dehydration), and substance avoidance (aspartame in pregnancy).
- Early identification and intervention can mitigate risks for carriers and their offspring.
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