Abstract
Hereditary motor and sensory neuropathy-type Lom (HMSNL), also known as CMT4D, a demyelinating neuropathy with late-onset deafness is an autosomal recessive disorder threatening Roma population worldwide. The clinical phenotype was reported in several case reports before the gene discovery. HMSNL is caused by a homozygous founder mutation p.Arg148* in the N-Myc downstream-regulated gene 1. Here, we report findings from the Czech Republic, where HMSNL was found in 12 Czech patients from eight families. In these 12 patients, 11 of the causes were due to p.Arg148* mutation inherited from both parents by the autosomal recessive mechanism. But in one case, the recessive mutation was inherited only from one parent (father) and unmasked owing to an uniparental isodisomy of the entire chromosome eight. The inherited peripheral neuropathy owing to an isodisomy of the whole chromosome pointed to an interesting, less frequent possibility of recessive disease and complications with genetic counseling.
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Acknowledgements
We thank the clinicians for their cooperation and examination of patients. Special thanks belong to the patients and their families for participating in this study. Supported by Ministry of Health of the Czech Republic, grant nr. 15-31899A. All rights reserved. Study was also supported by GACR 16-2179S.
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Šafka Brožková, D., Paulasová Schwabová, J., Neupauerová, J. et al. HMSN Lom in 12 Czech patients, with one unusual case due to uniparental isodisomy of chromosome 8. J Hum Genet 62, 431–435 (2017). https://doi.org/10.1038/jhg.2016.148
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DOI: https://doi.org/10.1038/jhg.2016.148
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