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Anatomical distributional defects in mutant genes associated with dominant intermediate Charcot-Marie-Tooth disease type C in an adenovirus-mediated mouse model

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Neural Regeneration Research 2017年第3期12卷 486-492页

作者： Seo Jin Lee Sandesh Panthi Hyun Woo Jo Jaeyoung Cho Min-Sik Kim Na Young Jeong In Ok Song Junyang Jung Youngbuhm Huh Department of Biomedical Science Graduate SchoolKyung Hee UniversityDongdaemun-guSeoulKorea Department of Medicine Graduate SchoolKyung Hee UniversityDongdaemun-guSeoulKorea Department of Applied Chemistry College of Applied ScienceKyung Hee UniversityYongin-siGyeonggi-doKorea Department of Anatomy and Cell Biology College of MedicineDong-A UniversitySeo-guBusanKorea Department of Reproductive Endocrinology and Infertility Department of Obstetrics and GynecologyCheil General HospitalDankook University College of MedicineJung-guSeoulKorea Department of Anatomy and Neurobiology College of MedicineKyung Hee UniversityDongdaemun-guSeoulKorea

Dominant intermediate Charcot-Marie-Tooth disease type C（DI-CMTC） is a dominantly inherited neuropathy that has been classified primarily based on motor conduction velocity tests but is now known to involve axonal and demyelination features.DI-CMTC is linked to tyrosyl-t RNA synthetase（yars）-associated neuropathies,which are caused by E196 K and G41 R missense mutations and a single de novo deletion（153-156 del VKQV）.It is well-established that these yars mutations induce neuronal dysfunction,morphological symptoms involving axonal degeneration,and impaired motor performance.The present study is the first to describe a novel mouse model of yars-mutation-induced neuropathy involving a neuron-specific promoter with a deleted mitochondrial targeting sequence that inhibits the expression of yars protein in the mitochondria.An adenovirus vector system and in vivo techniques were utilized to express yars fusion proteins with a Flag-tag in the spinal cord,peripheral axons,and dorsal root ganglia.Following transfection of yars-expressing viruses,the distributions of wild-type（WT） yars and E196 K mutant proteins were compared in all expressed regions; G41 R was not expressed.The proportion of Flag/green fluorescent protein（GFP） double-positive signaling in the E196 K mutant-type mice did not significantly differ from that of WT mice in dorsal root ganglion neurons.All adenovirus genes,and even the empty vector without the yars gene,exhibited GFP-positive signaling in the ventral horn of the spinal cord because GFP in an adenovirus vector is driven by a cytomegalovirus promoter.The present study demonstrated that anatomical differences in tissue can lead to dissimilar expressions of yars genes.Thus,use of this novel animal model will provide data regarding distributional defects between mutant and WT genes in neurons,the DICMTC phenotype,and potential treatment approaches for this disease.

关键词： nerve regeneration tyrosyl-tRNA synthetase yars-associated neuropathy yars mutation Charcot-Marie- Tooth Disease adenoviral vector-mediated mouse models neural regeneration

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