Monitoring maternal Beta carotene and retinol consumption may decrease the incidence of neurodevelopmental disorders...

Area of Science:

• Teratology
• Developmental Neurobiology
• Nutritional Science

Background:

• Retinoic acids (13-cis and 13-trans) are known teratogens, with retinol as their precursor.
• Excessive vitamin A intake (>10,000 IU/day) in the first trimester is linked to teratogenic effects, particularly on the central nervous system.
• Both vitamin A deficiency and excess pose risks to maternal and fetal health, suggesting a narrow therapeutic window.

Purpose of the Study:

• To highlight the potential teratogenic risks of both vitamin A and beta carotene during pregnancy.
• To propose monitoring fetal exposure to retinoic acid from various sources.
• To investigate the link between retinoic acid, cerebellar morphology, and neurodevelopmental disorders.

Main Methods:

• Review of existing literature on vitamin A metabolism and teratogenicity.
• Analysis of evidence regarding beta carotene placental transfer and fetal metabolism.
• Correlation of retinoic acid levels with neurodevelopmental disorders and cerebellar abnormalities.

Main Results:

• Beta carotene crosses the placenta and is metabolized to retinol, with limited storage in fetal fat.
• Fetal metabolism of beta carotene can increase the concentration of the more teratogenic 13-cis retinoic acid.
• Abnormalities in cerebellar morphology are associated with both excess retinoic acid and some neurodevelopmental disorders.

Conclusions:

• A narrow therapeutic ratio for vitamin A during pregnancy warrants careful consideration.
• Monitoring all sources of fetal retinoic acid, including supplements, diet, and beta carotene, is crucial, especially in the first trimester.
• Further research is needed to fully understand the behavioral teratogenicity of vitamin A derivatives.