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Morphometric analyses of shape: The analysis software toolbox for quantification of craniofacial shape
Biorxiv : the Preprint Server for Biology
|November 26, 2025
Summary
Prenatal ethanol exposure causes fetal alcohol spectrum disorders (FASD), affecting facial development. This study uses zebrafish and morphometric analysis to quantify craniofacial changes, aiding FASD research.
Area of Science:
- Developmental biology
- Genetics
- Morphometrics
Background:
- Fetal alcohol spectrum disorders (FASD) result from prenatal ethanol exposure, causing diverse physical, cognitive, and behavioral disabilities.
- Ethanol-induced craniofacial skeletal abnormalities in FASD are complex due to genetic variations.
- Zebrafish offer a valuable model for studying gene-ethanol interactions and craniofacial development due to conserved genes and developmental transparency.
Purpose of the Study:
- To develop and outline a morphometric approach for quantifying craniofacial shape changes in zebrafish larvae exposed to ethanol.
- To address limitations of linear measures in assessing overall facial shape alterations.
- To establish a protocol for analyzing gene-ethanol interactions affecting facial morphology.
Main Methods:
- Utilized zebrafish as a model organism for craniofacial development studies.
- Employed a morphometric approach involving principal component analysis (PCA) for shape analysis.
- Used freeware software (TPSDigs2, MorphoJ, PAST) for multivariate statistical analyses of facial morphology.
Main Results:
- Successfully quantified craniofacial cartilage shape changes in ethanol-treated zebrafish.
- Demonstrated the utility of PCA and complementary software in analyzing overall facial morphology.
- Established a method to overcome challenges in interpreting craniofacial shape data complicated by head size variations.
Conclusions:
- Developed a protocol for quantifying craniofacial cartilage shape in zebrafish larvae using free software.
- The described method enables precise measurement of facial structure changes induced by ethanol exposure.
- This approach facilitates the study of genetic and environmental factors influencing craniofacial development in FASD models.
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