ZFIN ID: ZDB-PUB-130712-8
Complex cardiac defects after ethanol exposure during discrete cardiogenic events in zebrafish: Prevention with folic acid
Sarmah, S., and Marrs, J.A.
Date: 2013
Source: Developmental dynamics : an official publication of the American Association of Anatomists   242(10): 1184-201 (Journal)
Registered Authors: Marrs, James A., Sarmah, Swapnalee
Keywords: none
MeSH Terms:
  • Alcohol-Induced Disorders/embryology
  • Alcohol-Induced Disorders/pathology
  • Alcohol-Induced Disorders/prevention & control*
  • Animals
  • Central Nervous System Depressants/adverse effects*
  • Central Nervous System Depressants/pharmacology
  • Ethanol/adverse effects*
  • Ethanol/pharmacology
  • Folic Acid/pharmacology*
  • Gastrulation/drug effects
  • Heart/embryology
  • Heart Defects, Congenital/chemically induced
  • Heart Defects, Congenital/embryology
  • Heart Defects, Congenital/pathology
  • Heart Defects, Congenital/prevention & control*
  • Organogenesis/drug effects
  • Vitamin B Complex/pharmacology*
  • Zebrafish/embryology*
PubMed: 23832875 Full text @ Dev. Dyn.

BACKGROUND: Fetal alcohol spectrum disorder (FASD) describes a range of birth defects including various congenital heart defects (CHDs). Mechanisms of FASD-associated CHDs are not understood. Whether alcohol interferes with a single critical event or with multiple events in heart formation is not known. RESULTS: Our zebrafish embryo experiments showed that ethanol interrupts different cardiac regulatory networks and perturbed multiple steps of cardiogenesis (specification, myocardial migration, looping, chamber morphogenesis and endocardial cushion formation). Ethanol exposure during gastrulation until cardiac specification or during myocardial midline migration did not produce severe or persistent heart development defects. However, exposure comprising gastrulation until myocardial precursor midline fusion or during heart patterning stages produced aberrant heart looping and defective endocardial cushions. Continuous exposure during entire cardiogenesis produced complex cardiac defects leading to severely defective myocardium, endocardium, and endocardial cushions. Supplementation of retinoic acid with ethanol partially rescued early heart developmental defects, but the endocardial cushions did not form correctly. In contrast, supplementation of folic acid rescued normal heart development, including the endocardial cushions. CONCLUSIONS: Our results indicate that ethanol exposure interrupted divergent cardiac morphogenesis events causing heart defects. Folic acid supplementation was effective in preventing a wide spectrum of ethanol-induced heart developmental defects.