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- Title
SNP array-based whole genome homozygosity mapping as the first step to a molecular diagnosis in patients with Charcot-Marie-Tooth disease.
- Authors
Fischer, Carina; Trajanoski, Slave; Papić, Lea; Windpassinger, Christian; Bernert, Günther; Freilinger, Michael; Schabhüttl, Maria; Arslan-Kirchner, Mine; Javaher-Haghighi, Poupak; Plecko, Barbara; Senderek, Jan; Rauscher, Christian; Löscher, Wolfgang; Pieber, Thomas; Janecke, Andreas; Auer-Grumbach, Michaela
- Abstract
Considerable non-allelic heterogeneity for autosomal recessively inherited Charcot-Marie-Tooth (ARCMT) disease has challenged molecular testing and often requires a large amount of work in terms of DNA sequencing and data interpretation or remains unpractical. This study tested the value of SNP array-based whole-genome homozygosity mapping as a first step in the molecular genetic diagnosis of sporadic or ARCMT in patients from inbred families or outbred populations with the ancestors originating from the same geographic area. Using 10 K 2.0 and 250 K Nsp Affymetrix SNP arrays, 15 (63%) of 24 CMT patients received an accurate genetic diagnosis. We used our Java-based script eHoPASA CMT-easy Homozygosity Profiling of SNP arrays for CMT patients to display the location of homozygous regions and their extent of marker count and base-pairs throughout the whole genome. CMT4C was the most common genetic subtype with mutations detected in SH3TC2, one (p.E632Kfs13X) appearing to be a novel founder mutation. A sporadic patient with severe CMT was homozygous for the c.250G > C (p.G84R) HSPB1 mutation which has previously been reported to cause autosomal dominant dHMN. Two distantly related CMT1 patients with early disease onset were found to carry a novel homozygous mutation in MFN2 (p.N131S). We conclude that SNP array-based homozygosity mapping is a fast, powerful, and economic tool to guide molecular genetic testing in ARCMT and in selected sporadic CMT patients.
- Subjects
CHARCOT-Marie-Tooth disease; GENETIC disorders; PERONEAL nerve diseases; SPINAL muscular atrophy; HUMAN chromosome abnormality diagnosis; GENOMES
- Publication
Journal of Neurology, 2012, Vol 259, Issue 3, p515
- ISSN
0340-5354
- Publication type
Article
- DOI
10.1007/s00415-011-6213-8