Variability and directionality of inferior olive neuron dendrites revealed by detailed 3D characterization of an extensive morphological library

Nora Vrieler, Sebastian Loyola, Yasmin Yarden-Rabinowitz, Jesse Hoogendorp, Nikolay Medvedev, Tycho M Hoogland, Chris I De Zeeuw, Erik De Schutter, Yosef Yarom, Mario Negrello, Ben Torben-Nielsen, Marylka Yoe Uusisaari

Research output: Contribution to journal/periodicalArticleScientificpeer-review

144 Downloads (Pure)

Abstract

The inferior olive (IO) is an evolutionarily conserved brain stem structure and its output activity plays a major role in the cerebellar computation necessary for controlling the temporal accuracy of motor behavior. The precise timing and synchronization of IO network activity has been attributed to the dendro-dendritic gap junctions mediating electrical coupling within the IO nucleus. Thus, the dendritic morphology and spatial arrangement of IO neurons governs how synchronized activity emerges in this nucleus. To date, IO neuron structural properties have been characterized in few studies and with small numbers of neurons; these investigations have described IO neurons as belonging to two morphologically distinct types, "curly" and "straight". In this work we collect a large number of individual IO neuron morphologies visualized using different labeling techniques and present a thorough examination of their morphological properties and spatial arrangement within the olivary neuropil. Our results show that the extensive heterogeneity in IO neuron dendritic morphologies occupies a continuous range between the classically described "curly" and "straight" types, and that this continuum is well represented by a relatively simple measure of "straightness". Furthermore, we find that IO neuron dendritic trees are often directionally oriented. Combined with an examination of cell body density distributions and dendritic orientation of adjacent IO neurons, our results suggest that the IO network may be organized into groups of densely coupled neurons interspersed with areas of weaker coupling.

Original languageEnglish
Pages (from-to)1677-1695
JournalBrain Structure & Function
Volume224
DOIs
Publication statusPublished - 01 Feb 2019

Fingerprint Dive into the research topics of 'Variability and directionality of inferior olive neuron dendrites revealed by detailed 3D characterization of an extensive morphological library'. Together they form a unique fingerprint.

Cite this