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http://dx.doi.org/10.5352/JLS.2019.29.7.800

Association between MIR149 SNPs and Intrafamilial Phenotypic Variations of Charcot-Marie-Tooth Disease Type 1A  

Choi, Yu Jin (Department of Biological Sciences, Kongju National University)
Lee, Ah Jin (Department of Biological Sciences, Kongju National University)
Nam, Soo Hyun (Department of Neurology, Samsung Medical Center, Sungkyunkwan University School of Medicine)
Choi, Byung-Ok (Department of Neurology, Samsung Medical Center, Sungkyunkwan University School of Medicine)
Chung, Ki Wha (Department of Biological Sciences, Kongju National University)
Publication Information
Journal of Life Science / v.29, no.7, 2019 , pp. 800-808 More about this Journal
Abstract
Charcot-Marie-Tooth disease (CMT) is a group of rare peripheral neuropathies characterized by progressive muscle weakness and atrophy and areflexia in the upper and lower extremities. The most common subtype of CMT is CMT1A, which is caused by a tandem duplication of the PMP22 gene in the 17p12 region. Patients with CMT1A show a loose genotype-phenotype correlation, which suggests the existence of secondary genetic or association factors. Recently, polymorphisms of rs71428439 (n.83A>G) and rs2292832 (n.86T>C) in the MIR149 have been reported to be associated with late onset and mild phenotypic CMT1A severity. The aim of this study was to examine the intrafamilial heterogeneities of clinical phenotypes according to the genotypes of these two SNPs in MIR149. For this study, we selected 6 large CMT1A families who showed a wide range of phenotypic variation. This study suggested that both SNPs were related to the onset age and severity in the dominant model. In particular, the AG+GG (n.83A>G) and TC+CC genotypes (n.86T>C) were associated to late onset and mild symptoms. Motor nerve conduction velocity (MNCV) was not related to the MIR149 genotypes. These results were consistent with the previous studies. Therefore, we suggest that the rs71428439 and rs2292832 variants in MIR149 may serve as genetic modifiers of CMT1A intrafamilial phenotypic heterogeneity, as they have a role in the unrelated patients. This is the first study to show an association using large families with variable clinical CMT1A phenotypes. The results will be helpful in the molecular diagnosis and treatment of patients with CMT1A.
Keywords
Charcot-Marie-Tooth disease Type 1A (CMT1A); genetic modifier; intrafamilial phenotypic heterogeneity; Korea; MIR149;
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