[P3-1~146] Poster Presentation 3

[P3-136] Neurite growth could be impaired by ETFDH mutation but restored by mitochondrial cofactors

^○Wen-Chen Liang^{1, 2} (1.Departments of Pediatrics, Kaohsiung Medical University Hospital, Kaohsiung Medical University, Kaohsiung, Taiwan, 2.Department of Pediatrics, College of Medicine, Kaohsiung Medical University, Kaohsiung, Taiwan)

Introduction: c.250G>A (p.Ala84Thr) in ETFDH is the most common mutation that causes later-onset multiple acyl-coenzyme A dehydrogenase deficiency (MADD) in the southern Chinese population. No functional study has targeted this mutation.
Methods: Using cells expressing ETFDH-wild type or ETFDH-mutant (p.Ala84Thr), reactive oxygen species (ROS) production and neurite length were analyzed, followed by pathomechanism exploration and drug screening.
Results: Increased ROS production and marked neurite shortening were observed in the cells expressing the ETFDH-mutant, compared with wild type. Further studies demonstrated that suberic acid, an accumulated intermediate metabolite in MADD, could significantly impair neurite outgrowth of NSC34 cells, but neurite shortening could be restored by supplementation with carnitine, riboflavin, or Coenzyme Q10.
Discussion: Neurite shortening caused by c.250G>A mutation in ETFDH suggests that neural defects could be underdiagnosed in human patients with MADD. This impairment might be treatable with the supplementation with mitochondrial cofactors.