Xenopus reduced folate carrier regulates neural crest development epigenetically

Area of Science:

• Developmental Biology
• Epigenetics
• Molecular Biology

Background:

• Folic acid deficiency during pregnancy leads to birth defects affecting neural crest cell development.
• The Reduced Folate Carrier (RFC) is crucial for transporting folate into cells, and its absence causes severe developmental issues.

Purpose of the Study:

• To investigate the role of the Reduced Folate Carrier (RFC) in neural crest development in Xenopus embryos.
• To elucidate the molecular mechanisms by which RFC influences neural crest gene expression and development.

Main Methods:

• XRFC gene knockdown using morpholino in Xenopus embryos.
• Analysis of neural crest marker gene expression.
• Overexpression studies of RFC and administration of 5-methyltetrahydrofolate.
• Animal cap assays to assess histone modifications (Histone3-K4) and rescue experiments with hMLL1.

Main Results:

• XRFC is specifically expressed in neural crest tissues.
• XRFC knockdown resulted in severe neurocristopathies and blocked neural crest marker gene expression.
• RFC overexpression or folate supplementation expanded neural crest territories.
• RFC knockdown reduced H3K4 methylation, which was partially rescued by hMLL1 co-injection.

Conclusions:

• The RFC-mediated folate pathway is essential for proper neural crest development.
• RFC influences neural crest gene expression through epigenetic modifications, specifically histone methylation.
• Targeting folate metabolism and epigenetic regulators may offer therapeutic strategies for preventing neurocristopathies.