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Human Rab7 mutation mimics features of Charcot-Marie-Tooth neuropathy type 2B in Drosophila.

Abstract：

:Charcot-Marie-Tooth disease type 2B (CMT2B) is an inherited axonal peripheral neuropathy. It is characterised by prominent sensory loss, often complicated by severe ulcero-mutilations of toes or feet, and variable motor involvement. Missense mutations in RAB7A, the gene encoding the small GTPase Rab7, cause CMT2B and increase Rab7 activity. Rab7 is ubiquitously expressed and is involved in degradation through the lysosomal pathway. In the neurons, Rab7 plays a role in the long-range retrograde transport of signalling endosomes in the axons. Here we developed the first animal model of CMT2B, modelling one of the mutations (L129F) in Drosophila melanogaster. Behavioural assays show that this model recapitulates several hallmarks of the human disease. Upon expression of mutant Rab7 in the sensory neurons, larvae present with a reduction of temperature and pain perception. Furthermore, the larvae exhibit a crawling defect when the mutant protein is expressed in the motor neurons. Analysis of axonal transport of Rab7 positive vesicles in sensory neurons of Drosophila larvae and in neurites of mammalian neuroblastoma cells demonstrates that mutant vesicles pause less than their wild-type counterparts. This latter finding indicates that alterations in vesicle transport might contribute to the pathomechanism of CMT2B.

journal_name

Neurobiol Dis

journal_title

Neurobiology of disease

authors

Janssens K,Goethals S,Atkinson D,Ermanoska B,Fransen E,Jordanova A,Auer-Grumbach M,Asselbergh B,Timmerman V

doi

10.1016/j.nbd.2014.01.021

subject

Has Abstract

pub_date

2014-05-01 00:00:00

pages

211-9

eissn

0969-9961

issn

1095-953X

pii

S0969-9961(14)00035-7

journal_volume

65

pub_type

杂志文章

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