Two novel mutations in the GDAP1 and PRX genes in early onset Charcot-Marie-Tooth syndrome.

Abstract:

:Autosomal recessive Charcot-Marie-Tooth syndrome (AR-CMT) is often characterised by an infantile disease onset and a severe phenotype. Mutations in the ganglioside-induced differentiation-associated protein 1 (GDAP1) gene are thought to be a common cause of AR-CMT. Mutations in the periaxin (PRX) gene are rare. They are associated with severe demyelination of the peripheral nerves and sometimes lead to prominent sensory disturbances. To evaluate the frequency of GDAP1 and PRX mutations in early onset CMT, we examined seven AR-CMT families and 12 sporadic CMT patients, all presenting with progressive distal muscle weakness and wasting. In one family also prominent sensory abnormalities and sensory ataxia were apparent from early childhood. In three families we detected four GDAP1 mutations (L58LfsX4, R191X, L239F and P153L), one of which is novel and is predicted to cause a loss of protein function. In one additional family with prominent sensory abnormalities a novel homozygous PRX mutation was found (A700PfsX17). No mutations were identified in 12 sporadic cases. This study suggests that mutations in the GDAP1 gene are a common cause of early-onset AR-CMT. In patients with early-onset demyelinating AR-CMT and severe sensory loss PRX is one of the genes to be tested.

journal_name

Neuropediatrics

journal_title

Neuropediatrics

authors

Auer-Grumbach M,Fischer C,Papić L,John E,Plecko B,Bittner RE,Bernert G,Pieber TR,Miltenberger G,Schwarz R,Windpassinger C,Grill F,Timmerman V,Speicher MR,Janecke AR

doi

10.1055/s-2008-1077085

subject

Has Abstract

pub_date

2008-02-01 00:00:00

pages

33-8

issue

1

eissn

0174-304X

issn

1439-1899

journal_volume

39

pub_type

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