Population differences in dysmorphic features among children with fetal alcohol spectrum disorders

Area of Science:

• Medical Genetics
• Pediatric Dysmorphology
• Public Health

Background:

• Fetal Alcohol Spectrum Disorders (FASDs) encompass a range of neurodevelopmental and physical abnormalities.
• Fetal Alcohol Syndrome (FAS) and Partial Fetal Alcohol Syndrome (PFAS) represent the most dysmorphic forms of FASDs.
• Understanding population-specific variations in dysmorphic features is crucial for accurate diagnosis.

Purpose of the Study:

• To investigate variations in significant dysmorphic features among children with FAS and PFAS across three distinct populations.
• To identify discriminating physical features for diagnosing FAS and PFAS in diverse ethnic groups.

Main Methods:

• Employed advanced multiple regression techniques to analyze diagnostic features.
• Studied children from Northern Plains Indian communities, South Africa, and Italy.
• Utilized a multilevel model to assess combined population data and identify predictive features.

Main Results:

• Significant variation in salient diagnostic features was observed across the three populations (intraclass correlation of 0.20).
• Key dysmorphology predictors consistently identified across populations include small palpebral fissures, narrow vermillion, smooth philtrum, flat nasal bridge, and fifth finger clinodactyly.
• Long philtrum showed substantial variability as a predictor; height, strabismus, interpupillary distance, intercanthal distance, and heart murmurs were not significant predictors.

Conclusions:

• Dysmorphic features associated with FAS and PFAS exhibit population-specific variations.
• A core set of common dysmorphic features enables consistent diagnosis across diverse populations.
• This finding supports the development of universally applicable diagnostic criteria for FASDs.