Abstract (eng)
The development and patterning of the vertebrate limb has been of interest in evolutionary developmental research (EvoDevo) for many years. Cell proliferation, as the main factor in growth and therefore of pattern formation, plays a crucial role in embryogenesis. This project has produced a 3D image data set of proliferating cells in the forelimbs and hindlimbs of chick embryos in a series of developmental stages.
The analyzed stages range from HH18, when limb buds are just visible, up to HH31, when digits are already distinguishable. The data shown correspond well to known cell proliferation patterns, which are mostly based on a few physical sections only. The 3D image data from this thesis enable a more detailed observation, due to the possibilities of virtually rotating and slicing the 3D images.
The image sets will be annotated and open-access published to allow interested researchers to use them for their studies. As this thesis is partly technical in its focus, it also demonstrates a scalable method for generating complete 3D images of whole developing limbs. By using fluorescent EdU (5’-ethynyl-2’-deoxyuridine) chemistry and light sheet fluorescence microscopy, visualization of proliferating cells was achieved at single-cell resolution in whole limbs. Also, tests for possible X-ray dense stains using EdU chemistry were run and give new insights on its possibilities.
The data can be used for cell density and cell count analyses, as is shown in a simple form in this thesis. They also provide a basis to guide future experiments on the limbs, such as manipulations of tissues, as well as testing of hypotheses or predictions. Furthermore, the image data can be used to refine and re-evaluate computer models that simulate limb development, patterning and growth.