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Morphometric analysis of face in dysmorphology.

Ashwin B Dalal1, Shubha R Phadke

  • 1Department of Medical Genetics, Sanjay Gandhi Postgraduate Institute of Medical Sciences, Lucknow, Uttar Pradesh 226014, India.

Computer Methods and Programs in Biomedicine
|November 23, 2006
PubMed
Summary

Geometric morphometrics offers an objective approach to studying facial birth defects. This method accurately differentiates individuals with Rubinstein Taybi syndrome from controls, advancing dysmorphology research.

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Area of Science:

  • Quantitative genetics
  • Medical imaging
  • Human genetics

Background:

  • Dysmorphology traditionally relies on subjective clinical assessments of congenital malformations.
  • Objective, quantifiable methods are needed to analyze facial variations in dysmorphic syndromes.

Purpose of the Study:

  • To apply geometric morphometrics for objective analysis of facial shape variation.
  • To differentiate individuals with Rubinstein Taybi syndrome from healthy controls using facial morphology.
  • To explore the potential of geometric morphometrics in genotype-phenotype association studies.

Main Methods:

  • Collected standardized facial photographs of 20 individuals with Rubinstein Taybi syndrome and 30 controls.
  • Digitized 16 facial landmarks to obtain 32 coordinate points.
  • Applied generalized Procrustes superimposition, principal component analysis (PCA), discriminant analysis, and logistic regression.

Main Results:

  • PCA identified three principal components explaining significant facial shape variance (41%, 17%, 14%).
  • Discriminant analysis achieved 76% accuracy in differentiating the groups based on PCA scores.
  • Logistic regression analysis demonstrated a predictive accuracy of 78%.

Conclusions:

  • Geometric morphometrics provides a promising, objective method for analyzing facial dysmorphism.
  • This quantitative approach can enhance genotype-phenotype correlation studies in dysmorphology.
  • The findings support the utility of geometric morphometrics as a novel research area in studying congenital malformations.