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Updated: May 12, 2026

An Approach to Enhance Alignment and Myelination of Dorsal Root Ganglion Neurons

An Approach to Enhance Alignment and Myelination of Dorsal Root Ganglion Neurons

Published on: August 24, 2016

Proteoglycan-mediated axon degeneration corrects pretarget topographic sorting errors.

Fabienne E Poulain¹, Chi-Bin Chien

¹University of Utah, Neurobiology and Anatomy Department, Salt Lake City, UT 84132, USA. fpoulain@genetics.utah.edu

|April 16, 2013

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Axon degeneration corrects misrouted nerve fibers in the developing brain. Heparan sulfate is essential for this process, ensuring proper brain wiring and function.

Area of Science:

Neuroscience
Developmental Biology
Cell Biology

Background:

Topographic map formation is vital for brain function, particularly in sensory systems.
Pretarget axon sorting is a key mechanism for map formation, but it is not fully understood.
Accurate axonal projections are essential for neural circuit development.

Purpose of the Study:

To investigate the mechanisms underlying topographic map formation in the developing brain.
To identify the role of axon degeneration in correcting missorted axons.
To explore the involvement of heparan sulfate in retinotectal development.

Main Methods:

Utilized zebrafish as a model organism for studying retinotectal development.
Observed and analyzed axon pathfinding and sorting during development.

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Last Updated: May 12, 2026

An Approach to Enhance Alignment and Myelination of Dorsal Root Ganglion Neurons

An Approach to Enhance Alignment and Myelination of Dorsal Root Ganglion Neurons

Published on: August 24, 2016

Using Live-Cell Imaging to Measure the Effects of Pathological Proteins on Axonal Transport in Primary Hippocampal Neurons

Using Live-Cell Imaging to Measure the Effects of Pathological Proteins on Axonal Transport in Primary Hippocampal Neurons

Published on: December 22, 2023

Investigated the effects of heparan sulfate deficiency and restoration on axon sorting.

Examined selective axon degeneration using microscopy techniques.

Main Results:

Missorted retinal axons in the optic tract are selectively eliminated through degeneration during zebrafish development.
Axon ordering is corrected post-initial pathfinding via this degeneration mechanism.
Heparan sulfate is required non-cell-autonomously for correcting missorted axons.
Restoring heparan sulfate synthesis can rescue topographic sorting defects.

Conclusions:

Developmental axon degeneration plays a crucial role in ordering axonal projections for topographic map formation.
Heparan sulfate acts as a key regulator in the process of correcting missorted axons.
This study reveals a novel function for axon degeneration in ensuring precise neural wiring.