Paper Chase is a research database designed to offer abstracts of research articles published in journals that have a highly rated impact factor as determined by ISI Impact Factor and PageRank. Abstracts are organized by date, with the most recently published papers listed first. 

Paper Chase

Cell-intrinsic requirement of Dscam1 isoform diversity for axon collateral formation.

Science. Jun 6, 2014;344(6188):1182-6.
He H, Kise Y, Izadifar A, Urwyler O, Ayaz D, Parthasarthy A, Yan B, Erfurth ML, Dascenco D, Schmucker D.

Neuronal Wiring Laboratory, Vlaams Instituut voor Biotechnologie (VIB) Vesalius Research Center, 3000 Leuven, Belgium. Department of Oncology, School of Medicine, University of Leuven, 3000 Leuven, Belgium. dietmar.schmucker@vib-kuleuven.be.

Abstract:

The isoform diversity of the Drosophila Dscam1 receptor is important for neuronal self-recognition and self-avoidance. A canonical model suggests that homophilic binding of identical Dscam1 receptor isoforms on sister dendrites ensures self-avoidance even when only a single isoform is expressed. We detected a cell-intrinsic function of Dscam1 that requires the coexpression of multiple isoforms. Manipulation of the Dscam1 isoform pool in single neurons caused severe disruption of collateral formation of mechanosensory axons. Changes in isoform abundance led to dominant dosage-sensitive inhibition of branching. We propose that the ratio of matching to nonmatching isoforms within a cell influences the Dscam1-mediated signaling strength, which in turn controls axon growth and growth cone sprouting. Cell-intrinsic use of surface receptor diversity may be of general importance in regulating axonal branching during brain wiring.