title: DGAT2 Mutation in a Family with Autosomal-Dominant Early-Onset Axonal Charcot-Marie-Tooth Disease.
abstract: Charcot-Marie-Tooth disease (CMT) is the most common inherited peripheral neuropathy and is a genetically and clinically heterogeneous disorder. We examined a Korean family in which two individuals had an autosomal-dominant axonal CMT with early-onset, sensory ataxia, tremor, and slow disease progression. Pedigree analysis and exome sequencing identified a de novo missense mutation (p.Y223H) in the diacylglycerol O-acyltransferase 2 (DGAT2) gene. DGAT2 encodes an endoplasmic reticulum-mitochondrial-associated membrane protein, acyl-CoA:diacylglycerol acyltransferase, which catalyzes the final step of the triglyceride (TG) biosynthesis pathway. The patient showed consistently decreased serum TG levels, and overexpression of the mutant DGAT2 significantly inhibited the proliferation of mouse motor neuron cells. Moreover, the variant form of human DGAT2 inhibited the axonal branching in the peripheral nervous system of zebrafish. We suggest that mutation of DGAT2 is the novel underlying cause of an autosomal-dominant axonal CMT2 neuropathy. This study will help provide a better understanding of the pathophysiology of axonal CMT and contribute to the molecular diagnostics of peripheral neuropathies.
authors.affiliation: Stem Cell & Regenerative Medicine Institute, Samsung Medical Center, Seoul, South Korea.
authors.forename: Young Bin
authors.initials: YB
authors.lastname: Hong
authors.affiliation: Department of Health Sciences and Technology, SAIHST, Sungkyunkwan University, Seoul, South Korea.
authors.forename: Junghee
authors.initials: J
authors.lastname: Kang
authors.affiliation: Department of Health Sciences and Technology, SAIHST, Sungkyunkwan University, Seoul, South Korea.
authors.forename: Ji Hyun
authors.initials: JH
authors.lastname: Kim
authors.affiliation: Neuroscience center, Samsung Medical Center, Seoul, South Korea.
authors.forename: Jinho
authors.initials: J
authors.lastname: Lee
authors.affiliation: Department of Health Sciences and Technology, SAIHST, Sungkyunkwan University, Seoul, South Korea.|Neuroscience center, Samsung Medical Center, Seoul, South Korea.
authors.forename: Geon
authors.initials: G
authors.lastname: Kwak
authors.affiliation: Department of Biological Sciences, Kongju National University, Gongju, South Korea.
authors.forename: Young Se
authors.initials: YS
authors.lastname: Hyun
authors.affiliation: Department of Biological Sciences, Kongju National University, Gongju, South Korea.
authors.forename: Soo Hyun
authors.initials: SH
authors.lastname: Nam
authors.affiliation: Department of Biological Sciences, Kongju National University, Gongju, South Korea.
authors.forename: Hyun Dae
authors.initials: HD
authors.lastname: Hong
authors.affiliation: Department of Biochemistry, Ewha Womans University School of Medicine, Seoul, South Korea.
authors.forename: Yu-Ri
authors.initials: YR
authors.lastname: Choi
authors.affiliation: Department of Biochemistry, Ewha Womans University School of Medicine, Seoul, South Korea.
authors.forename: Sung-Chul
authors.initials: SC
authors.lastname: Jung
authors.affiliation: Department of Pathology, Ewha Womans University School of Medicine, Mokdong Hospital, Seoul, South Korea.
authors.forename: Heasoo
authors.initials: H
authors.lastname: Koo
authors.affiliation: Department of Health Sciences and Technology, SAIHST, Sungkyunkwan University, Seoul, South Korea.|SGI, Samsung Medical Center, Seoul, South Korea.
authors.forename: Ji Eun
authors.initials: JE
authors.lastname: Lee
authors.affiliation: Department of Health Sciences and Technology, SAIHST, Sungkyunkwan University, Seoul, South Korea.|Neuroscience center, Samsung Medical Center, Seoul, South Korea.|Department of Neurology, Sungkyunkwan University School of Medicine, Seoul, South Korea.
authors.forename: Byung-Ok
authors.initials: BO
authors.lastname: Choi
authors.affiliation: Department of Biological Sciences, Kongju National University, Gongju, South Korea.
authors.forename: Ki Wha
authors.initials: KW
authors.lastname: Chung
mesh_terms: D000328:Adult; D017668:Age of Onset; D000818:Animals; D001369:Axons / Q000378:metabolism / Q000473:pathology*; D002460:Cell Line; D049109:Cell Proliferation; D002607:Charcot-Marie-Tooth Disease / Q000235:genetics* / Q000378:metabolism / Q000473:pathology; D002648:Child; D051048:Diacylglycerol O-Acyltransferase / Q000235:genetics* / Q000378:metabolism*; D020022:Genetic Predisposition to Disease; D006801:Humans; D008297:Male; D051379:Mice; D009046:Motor Neurons / Q000166:cytology / Q000378:metabolism; D020125:Mutation, Missense; D010375:Pedigree; D015027:Zebrafish / Q000378:metabolism; D029961:Zebrafish Proteins / Q000235:genetics / Q000378:metabolism
chemical_list: D029961:Zebrafish Proteins; C494885:DGAT2 protein, human; D051048:Diacylglycerol O-Acyltransferase
keywords: Charcot-Marie-Tooth disease; DGAT2; axonal neuropathy; exome; zebrafish