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Hyperhomocysteinaemia and associated disease
1Department of Internal Medicine, Onze Lieve Vrouwe Gasthuis, Amsterdam, The Netherlands.
Insights
Mildly elevated homocysteine levels, often genetically determined, increase risks for vascular disease and pregnancy complications. While vitamin treatment is possible, its benefits require further study.
Area of Science:
- Biochemistry
- Genetics
- Vascular Medicine
Background:
- Elevated plasma homocysteine is linked to environmental and genetic factors.
- Severe hyperhomocysteinemia is rare, typically manifesting in childhood with vascular complications.
- Mildly elevated homocysteine affects 5% of the population, increasing risks for atherosclerosis, thrombosis, and pregnancy issues.
Purpose of the Study:
- To review the causes and consequences of elevated plasma homocysteine.
- To highlight the role of genetic factors, such as MTHFR deficiency, in hyperhomocysteinemia.
- To discuss the potential for vitamin supplementation in managing mild hyperhomocysteinemia.
Main Methods:
- Literature review of genetic and environmental factors influencing homocysteine levels.
- Analysis of epidemiological data linking homocysteine to vascular disease and pregnancy outcomes.
- Examination of studies on MTHFR gene variants and their interaction with folate intake.
Main Results:
- Mild hyperhomocysteinemia is associated with increased risk of premature atherosclerosis, venous thrombosis, neural tube defects, and early pregnancy loss.
- Homozygosity for thermolabile methylenetetrahydrofolate reductase (MTHFR) deficiency is a significant genetic contributor, influenced by dietary folate.
- Vitamin supplementation offers a potential treatment, but clinical benefits are not yet definitively established.
Conclusions:
- Mild hyperhomocysteinemia is a prevalent condition with significant health implications.
- Genetic factors, particularly MTHFR mutations, play a crucial role, modulated by nutritional status.
- Further research is needed to confirm the efficacy of vitamin supplementation for treating mild hyperhomocysteinemia and its associated risks.
Abstract:
An elevated plasma homocysteine level may result from various environmental and genetic factors. Herediatary causes of severe hyperhomo-cysteinaemia are very rare and usually lead to disease in childhood or adolescence. Common pathology consists of early atherosclerotic vascular changes, arterioocclusive complications and venous thrombosis. Mildly elevated genetically determined plasma homocysteine levels are observed in 5% of the general population. In the last two decades research has shown mild hyperhomocysteinaemia to be linked to an increased risk of premature atherosclerosis, pregnancies complicated by neural tube defects and early pregnancy loss, and venous thrombosis. Homozygosity for thermolabile MTHFR deficiency has been identified as one important genetic factor, which expression is modified by dietary folate intake. Although mild hyperhomocysteinaemia can easily be treated by vitamin supplementation the beneficial effects of such treatment remains to be shown.