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CMT 2A: Phenotypic Spectrum of MFN2 Mutations in the Spanish Population

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J Med Genet. 2009 Nov 3. [Epub ahead of print]

Phenotypic Spectrum of MFN2 Mutations in the Spanish Population.

Casasnovas C, Banchs I, Cassereau J, Gueguen N, Chevrollier A, Martínez-Matos

JA, Bonneau D, Volpini V.

1 Unitat de Neuromuscular. Hospital Universitari de Bellvitge - IDIBELL, Spain;

The most common form of axonal Charcot-Marie-Tooth disease (CMT) is type 2A,

caused by mutations in mitochondrial GTPase mitofusin 2 (MFN2).

The objective of our study is to establish the incidence of MFN2 mutations in a

cohort of Spanish patients with axonal CMT neuropathy.

We studied 85 families with suspected axonal CMT. All MFN2 exons were studied

through direct sequencing. A bioenergetics study in fibroblasts was conducted

using a skin biopsy taken from a patient with an Arg468His mutation.

Twenty-four patients from 14 different families were identified with nine

different MFN2 mutations (Arg94Trp, Arg94Gln, Ile203Met, Asn252Lys, Gln276His,

Gly296Arg, Met376Val, Arg364Gln, and Arg468His). All mutations were found in the

heterozygous state and four of these mutations had not been described

previously.

MFN2 mutations were responsible for CMT2 in 16%+/-7.7% of the families studied

and in 30.8%+/-14.2% (12/39) of families with known dominant inheritance. The

bioenergetic studies in fibroblasts show typical results of MFN2 patients with a

mitochondrial coupling defect (ATP/O) and an increase of the respiration rate

linked to complex II.

We conclude that mutations in MFN2 are the most frequent cause of CMT2 in this

region. The Arg468His mutation was the most prevalent (6/14 families) and our

study confirmed that it is pathological, presenting as a neuropathy in a mild to

moderate degree.

This study also demonstrated the value of MFN2 studies in cases of congenital

axonal neuropathy, especially in cases of dominant inheritance, severe clinical

symptoms, or additional symptoms such as optic atrophy.

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