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Velocimetric third-harmonic generation microscopy: micrometer-scale quantification of morphogenetic movements in
Delphine Débarre1, Willy Supatto, Emmanuel Farge
1Laboratory for Optics and Biosciences, Centre National de la Recherche Scientifique, Institut National de la Santé et de la Recherche Médicale, Ecole Polytechnique, F-91128 Palaiseau, France.
Optics Letters
|January 14, 2005
Summary
We combined third-harmonic generation (THG) microscopy and particle image velocimetry (PIV) to automatically track embryonic development. This novel method quantifies internal cell movements in unstained embryos without disrupting growth.
Area of Science:
- Developmental Biology
- Biophysics
- Microscopy
Background:
- Morphogenetic movements are crucial for embryonic development.
- Characterizing these movements at the micrometer scale is challenging.
- Existing techniques may require staining or perturb development.
Purpose of the Study:
- To develop and validate a novel functional imaging technique for automated micrometer-scale characterization of morphogenetic movements.
- To combine third-harmonic generation (THG) microscopy with particle image velocimetry (PIV) analysis.
- To assess the impact of THG imaging on embryonic development.
Main Methods:
- Utilized a combined two-photon-excited fluorescence and THG microscope.
- Applied particle image velocimetry (PIV) analysis to THG images.
- Characterized optical properties of Drosophila embryos.
- Performed sustained THG imaging to assess developmental perturbation.
Main Results:
- Demonstrated the association of THG microscopy and PIV analysis as a novel functional imaging technique.
- Showed that sustained THG imaging does not perturb sensitive developmental dynamics.
- Velocimetric THG imaging provided quantitative descriptions of internal structure dynamics.
- Successfully characterized movements in unstained wild-type and mutant Drosophila embryos.
Conclusions:
- The combined THG-PIV technique enables automated, micrometer-scale characterization of embryonic morphogenetic movements.
- This method is non-invasive, suitable for unstained biological samples.
- It offers a powerful tool for studying developmental dynamics in both wild-type and mutant embryos.
