Deficiency in the mRNA export mediator Gle1 impairs Schwann cell development in the zebrafish embryo.

Abstract:

:GLE1 mutations cause lethal congenital contracture syndrome 1 (LCCS1), a severe autosomal recessive fetal motor neuron disease, and more recently have been associated with amyotrophic lateral sclerosis (ALS). The gene encodes a highly conserved protein with an essential role in mRNA export. The mechanism linking Gle1 function to motor neuron degeneration in humans has not been elucidated, but increasing evidence implicates abnormal RNA processing as a key event in the pathogenesis of several motor neuron diseases. Homozygous gle1(-/-) mutant zebrafish display various aspects of LCCS, showing severe developmental abnormalities including motor neuron arborization defects and embryonic lethality. A previous gene expression study on spinal cord from LCCS fetuses indicated that oligodendrocyte dysfunction may be an important factor in LCCS. We therefore set out to investigate the development of myelinating glia in gle1(-/-) mutant zebrafish embryos. While expression of myelin basic protein (mbp) in hindbrain oligodendrocytes appeared relatively normal, our studies revealed a prominent defect in Schwann cell precursor proliferation and differentiation in the posterior lateral line nerve. Other genes mutated in LCCS have important roles in Schwann cell development, thereby suggesting that Schwann cell deficits may be a common factor in LCCS pathogenesis. These findings illustrate the potential importance of glial cells such as myelinating Schwann cells in motor neuron diseases linked to RNA processing defects.

journal_name

Neuroscience

journal_title

Neuroscience

authors

Seytanoglu A,Alsomali NI,Valori CF,McGown A,Kim HR,Ning K,Ramesh T,Sharrack B,Wood JD,Azzouz M

doi

10.1016/j.neuroscience.2016.02.039

subject

Has Abstract

pub_date

2016-05-13 00:00:00

pages

287-97

eissn

0306-4522

issn

1873-7544

pii

S0306-4522(16)00179-2

journal_volume

322

pub_type

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