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Characterizing the diverse cells that associate with the developing commissures of the zebrafish forebrain

Schnabl, J. and Litz, M. P. H. and Schneider, C. and PenkoffLidbeck, N. and Bashiruddin, S. and Schwartz, M. S. and Alligood, K. and Barresi, M. J. F. (2020) Characterizing the diverse cells that associate with the developing commissures of the zebrafish forebrain. . (Unpublished)

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During embryonic development of bilateral organisms, neurons send axons across the midline at specific points to connect the two halves of the nervous system with a commissure. Little is known about the cells at the midline that facilitate this tightly regulated process. We exploit the con served process of vertebrate embryonic development in the zebrafish model system to elucidate the identity of cells at the midline that may facilitate postoptic (POC) and anterior commissure (AC) development. We have discovered that three differentgfap+ astroglial cell morphologies persist in contact with pathfinding axons throughout commissure formation. Similarly, olig2+ progenitor cells occupy delineated portions of the postoptic and anterior commissures. These early olig2+ progenitors demonstrate glial-like morphologies despite the lack of a myelination marker. Moreover, we conclude that both the gfap+ and olig2+progenitor cells give rise to neuronal populations in both the telencephalon and diencephalon. Interestingly, these varied cell populations showed significant developmental heterochrony between the telencephalon and diencephalon. Lastly, we also showed that fli1a+ mesenchymal cells migrate along the presumptive commissure regions before and during midline axon crossing. Furthermore, following commissure maturation, specific blood vessels formed at the midline of the POC and immediately ventral and parallel to the AC. This comprehensive account of the cellular populations that correlate with the timing and position of commissural axon pathfinding has supported the conceptual modeling and identification of the early forebrain architecture that may be necessary for proper commissure development.

Item Type:Report or Paper (Discussion Paper)
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Additional Information:The copyright holder for this preprint is the author/funder, who has granted bioRxiv a license to display the preprint in perpetuity. Posted July 17, 2020. We would like to thank Alicia Famiglietti, Cassie Kemmler, Narendra Pathak, Risha Sinha, Rachael Stein, Carla Valez, and Paula Zaman for all their supportive contributions during the course of this research. We would also like to thank the Smith College Center for Microscopy and its manager, Judith Wopereis, and the Smith Animal Care facility for their constant support and technical assistance throughout this work. Lastly, we are extremely appreciative of all constructive discourse provided by the entire Barresi lab from the first experiments to the final manuscript. This research was generously supported by the National Science Foundation [IOS-1656310] and by Smith College for both undergraduate and graduate student support. The authors declare no conflicts of interest.
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Subject Keywords:zebrafish, commissure, forebrain, glia, Gfap
Record Number:CaltechAUTHORS:20200720-125317774
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Official Citation:Characterizing the diverse cells that associate with the developing commissures of the zebrafish forebrain. J. Schnabl, M.P.H. Litz, C. Schneider, N. PenkoffLidbeck, S. Bashiruddin, M.S. Schwartz, K. Alligood, M.J.F. Barresi. bioRxiv 2020.07.16.205153; doi:
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:104454
Deposited By: Tony Diaz
Deposited On:20 Jul 2020 21:03
Last Modified:20 Jul 2020 21:03

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