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Selected Publication:
SHR Neuro Cancer Cardio Lipid Metab Microb
Rohkamm, B; Reilly, MM; Lochmuller, H; Schlotter-Weigel, B; Barisic, N; Schols, L; Laura, M; Janecke, AR; Miltenberger-Miltenyi, G; John, E; Fischer, C; Grill, F; Wakeling, W; Davis, M; Pieber, TR; Auer-Grumbach, M; Nicholson, G; Pareyson, D.
Further evidence for genetic heterogeneity of distal HMN type V, CMT2 with predominant hand involvement and Silver syndrome.
J NEUROL SCI. 2007; 263(1-2): 100-106.
Doi: 10.1016/j.jns.2007.06.047
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- Leading authors Med Uni Graz
- Auer-Grumbach Michaela
- Co-authors Med Uni Graz
- Fischer Carina
- Pieber Thomas
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- Abstract:
- OBJECTIVE: Distal hereditary motor neuropathy type V (dHMN-V) and Charcot-Marie-Tooth syndrome (CMT) type 2 presenting with predominant hand involvement, also known as CMT2D and Silver syndrome (SS) are rare phenotypically overlapping diseases which can be caused by mutations in the Berardinelli-Seip Congenital Lipodystrophy 2 (BSCL2) and in the glycyl-tRNA synthetase encoding (GARS) genes. Mutations in the heat-shock proteins HSPB1 and HSPB8 can cause related distal hereditary motor neuropathies (dHMN) and are considered candidates for dHMN-V, CMT2, and SS. DESIGN: To define the frequency and distribution of mutations in the GARS, BSCL2, HSPB1 and HSPB8 genes we screened 33 unrelated sporadic and familial patients diagnosed as either dHMN-V, CMT2D or SS. Exon 3 of the BSCL2 gene was screened in further 69 individuals with an unclassified dHMN phenotype or diagnosed as hereditary spastic paraplegia (HSP) complicated by pure motor neuropathy. RESULTS: Four patients diagnosed with dHMN-V or SS carried known heterozygous BSCL2 mutations (N88S and S90L). In one dHMN-V patient we detected a putative GARS mutation (A57V). No mutations were detected in HSPB1 and HSPB8. The diagnostic yield gained in the series of 33 probands was 12% for BSCL2 mutations and 3% for GARS mutations. In the series of unclassified dHMN and complicated HSP cases no mutations were found. CONCLUSIONS: Our data confirm that most likely only two mutations (N88S, S90L) in exon 3 of BSCL2 may lead to dHMN-V or SS phenotypes. Mutations in GARS, HSPB1 and HSPB8. are not a common cause of dHMN-V, SS and CMT2D. We would therefore suggest that a genetic testing of dHMN-V and SS patients should begin with screening of exon 3 of the BSCL2 gene. Screening of the GARS gene is useful in patients with CMT2 with predominant hand involvement and dHMN-V. The rather low frequencies of BSCL2, GARS, HSPB1 and HSPB8 mutations in dHMN-V, CMT2D and SS patients strongly point to further genetic heterogeneity of these related disorders.
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- Charcot-Marie-Tooth disease type 2D
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- distal hereditary motor neuropathy
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