Dendrites achieve characteristic spacing patterns during development to ensure appropriate coverage of territories. Mechanisms of dendrite positioning via repulsive dendrite-dendrite interactions are beginning to be elucidated, but the control, and importance, of dendrite positioning relative to their substrate is poorly understood. We found that dendritic… (More)
Elevated levels of amyloid-beta peptide (Abeta) are found in Down's syndrome patients and alter synaptic function during the early stages of Alzheimer's disease. Dendritic spines, sites of most excitatory synaptic contacts, are considered to be an important locus for encoding synaptic plasticity. We used time-lapse two-photon imaging of hippocampal… (More)
At the optic chiasm, retinal ganglion cell (RGC) axons make the decision to either avoid or traverse the midline, a maneuver that establishes the binocular pathways. In mice, the ipsilateral retinal projection arises from RGCs in the peripheral ventrotemporal (VT) crescent of the retina. These RGCs express the guidance receptor EphB1, which interacts with… (More)
The development of neuronal dendritic trees involves positive and negative control of growth and branching, as well as modulation of the spacing and orientation of branches. A new study reveals the importance of a membrane fusogen in the dendrite arborization of a pair of highly-branched worm sensory neurons.