The glycosylation pathway is required for the secretion of Slit and for the maintenance of the Slit receptor Robo on axons.

Abstract:

:Slit proteins act as repulsive axon guidance cues by activating receptors of the Roundabout (Robo) family. During early neurogenesis in Drosophila melanogaster, Slit prevents the growth cones of longitudinal tract neurons from inappropriately crossing the midline, thus restricting these cells to trajectories parallel to the midline. Slit is expressed in midline glial cells, and Robo is present in longitudinal axon tracts and growth cones. We showed that the enzyme Mummy (Mmy) controlled Slit-Robo signaling through mechanisms that affected both the ligand and the receptor. Mmy was required for the glycosylation of Slit, which was essential for Slit secretion. Mmy was also required for maintaining the abundance and spatial distribution of Robo through an indirect mechanism that was independent of Slit secretion. Moreover, secretion of Slit was required to maintain the fasciculation and position of longitudinal axon tracts, thus maintaining the hardwiring of the nervous system. Thus, Mmy is required for Slit secretion and for maintaining Robo abundance and distribution in the developing nervous system in Drosophila.

journal_name

Sci Signal

journal_title

Science signaling

authors

Manavalan MA,Jayasinghe VR,Grewal R,Bhat KM

doi

10.1126/scisignal.aam5841

subject

Has Abstract

pub_date

2017-06-20 00:00:00

issue

484

eissn

1945-0877

issn

1937-9145

pii

10/484/eaam5841

journal_volume

10

pub_type

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