Deficiency of the E3 ubiquitin ligase TRIM2 in early-onset axonal neuropathy.

Abstract:

:Inherited peripheral neuropathies are a heterogeneous group of disorders that can affect patients of all ages. Children with inherited neuropathy often develop severe disability, but the genetic causes of recessive early-onset axonal neuropathies are not fully known. We have taken a whole-exome sequencing approach to identify causative disease mutations in single patients with early-onset axonal neuropathy. Here, we report compound heterozygous mutations in the tripartite motif containing 2 (TRIM2) gene in a patient with childhood-onset axonal neuropathy, low weight and small muscle mass. We show that the patient fibroblasts are practically devoid of TRIM2, through mRNA and protein instability caused by the mutations. TRIM2 is an E3 ubiquitin ligase that ubiquitinates neurofilament light chain, a component of the intermediate filament in axons. Resembling the findings in our patient's sural nerve biopsy, Trim2-gene trap mice showed axonopathy with accumulations of neurofilaments inside axons. Our results suggest that loss-of-function mutations in TRIM2 are a cause of axonal neuropathy, which we propose to develop as a consequence of axonal accumulation of neurofilaments, secondary to lack of its ubiquitination by TRIM2.

journal_name

Hum Mol Genet

journal_title

Human molecular genetics

authors

Ylikallio E,Pöyhönen R,Zimon M,De Vriendt E,Hilander T,Paetau A,Jordanova A,Lönnqvist T,Tyynismaa H

doi

10.1093/hmg/ddt149

subject

Has Abstract

pub_date

2013-08-01 00:00:00

pages

2975-83

issue

15

eissn

0964-6906

issn

1460-2083

pii

ddt149

journal_volume

22

pub_type

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