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Published on: November 6, 2014
Mouse embryonic phenotyping by morphometric analysis of MR images
M Zamyadi1, L Baghdadi, J P Lerch
1Department of Medical Biophysics, University of Toronto, Hospital for Sick Children, Toronto, Ontario, Canada.
Physiological Genomics
|August 5, 2010
Summary
A new method uses high-resolution MRI to automatically detect subtle differences in mouse embryo morphology. This technique reveals strain-specific anatomical variations, aiding in the study of genetic mutations.
Area of Science:
- Developmental Biology
- Medical Imaging
- Genetics
Background:
- Accurate phenotyping of mouse embryos is crucial for understanding gene function.
- Subtle morphological variations can indicate developmental abnormalities or genetic differences.
- Existing methods may lack the resolution or automation for detecting fine-grained phenotypic changes.
Purpose of the Study:
- To develop and validate a novel method for automatic detection of subtle morphological phenotypes in mouse embryos.
- To quantify anatomical variations between two inbred mouse strains using high-resolution imaging.
- To assess the utility of the method for identifying genetically influenced phenotypic differences.
Main Methods:
- Utilized high-resolution magnetic resonance imaging (MRI) for mouse embryo scanning.
- Employed nonlinear image alignment to compare embryo morphology.
- Analyzed morphological variations in C57BL/6J and 129Sv/S1ImJ strains at 15.5 days postconception.
- Quantified local size differences and organ volumes.
Main Results:
- The method demonstrated high amenability to analysis with low residual variation (avg. 110 μm) after pose and scale normalization.
- C57BL/6J embryos were found to be larger overall than 129Sv/S1ImJ embryos.
- Specific organ differences were observed: heart and lung larger in C57BL/6J, while brain and liver volumes were comparable.
- A consistent but organ-specific relationship between organ size and embryo size was noted.
Conclusions:
- The developed technique effectively detects subtle morphological phenotypes in mouse embryos.
- This method provides a powerful tool for comparative embryology and genetic studies.
- It can identify strain-specific anatomical variations, potentially linked to genetic mutations.
