Patterns of oriented cell division during the steady-state morphogenesis of the body column in hydra

Developmental Dynamics : an Official Publication of the American Association of Anatomists
H ShimizuH R Bode

Abstract

In an adult hydra, the tissue of the body column is in a dynamic state. The epithelial cells of both layers are constantly in the mitotic cycle. As the tissue expands, it is continuously displaced along the body axis in either an apical or basal direction, but not in a circumferential direction. Using a modified whole mount method we examined the orientation of mitotic spindles to determine what role the direction of cell division plays in axial displacement. Surprisingly, the direction of cell division was found to differ in the two epithelial layers. In the ectoderm it was somewhat biased in an axial direction. In the endoderm it was strongly biased in a circumferential direction. For both layers, the directional biases occurred throughout the length of the body column, with some regional variation in its extent. As buds developed into adults, the bias in each layer increased from an almost random distribution to the distinctly different orientations of the adult. Thus, to maintain the observed axial direction of tissue displacement, rearrangement of the epithelial cells of both layers must occur continuously in the adult as well as in developing animals. How the locomotory and contractile behavior of the muscle processes of ...Continue Reading

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Citations

Mar 25, 2006·Proceedings of the National Academy of Sciences of the United States of America·Jörg WittliebThomas C G Bosch
Feb 25, 2009·Proceedings of the National Academy of Sciences of the United States of America·Isabelle PhilippBert Hobmayer
Jul 16, 2011·Developmental Dynamics : an Official Publication of the American Association of Anatomists·Viktoriya HalachevaChristoph Viebahn
Jun 21, 2017·Biology Open·Roland AufschnaiterBert Hobmayer
Jul 31, 2020·Proceedings of the National Academy of Sciences of the United States of America·Maria BroounHelen McNeill
Mar 14, 2020·Developmental Biology·Rui Wang, Eva-Maria S Collins

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