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#alcohol

19 public questions tagged with this topic.

Teratogens

Fetal Alcohol Syndrome (FAS) primarily results from damage to:

Facial dysmorphology and microcephaly hallmark fetal alcohol syndrome originate primarily from injury to two populations. Cranial neural crest cells arising at dorsal neural tube edges migrate into frontonasal prominence contributing to facial skeleton highly sensitive to oxidative apoptosis, impaired L1 adhesion and reduced sonic hedgehog trophic support after ethanol. Depleted crest leads to midfacial hypoplasia. Simultaneously ventricular zone neuronal progenitors and postmitotic neurons undergo ROS-mediated apoptosis and cell cycle arrest, reducing brain volume and cortical complexity. Liver, lung less affected. Combined neural crest and neuronal cell loss explains neurocristopathy features central to fetal alcohol syndrome presentation.

Ref: Moore, The Developing Human, 11th ed., Chapter 20: FAS neural crest and neuronal damage.

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Teratogens

Alcohol induces premature differentiation of:

Ethanol exposure disrupts maintenance of neural crest stemness by increasing intracellular free radicals and altering histone acetylation, prompting premature exit from multipotent state. Normal neural crest cells undergo extensive migration before differentiating into craniofacial cartilage, peripheral ganglia and melanocytes, requiring precise timing control by Wnt and BMP signals. Early differentiation depletes migratory pool, causing insufficient colonization of facial prominences and pharyngeal arches. Markers of differentiation such as neurofilament and melanin appear early in vitro after ethanol treatment, while progenitor markers p75 and Sox10 decline, illustrating accelerated maturation detrimental to craniofacial morphogenesis and leading to dysmorphology.

Ref: Gilbert, Developmental Biology, 12th ed., Chapter 20: Alcohol induces premature neural crest differentiation.

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