Sistema FMUSP-HC: Faculdade de Medicina da Universidade de São Paulo (FMUSP) e Hospital das Clínicas da FMUSPROCHA, Emanuelle Bianchi da SilvaRODRIGUES, Ketteny de LimaMONTOURO, Laura Alonso MatheusCOELHO, erica NogueiraKOUYOUMDJIAN, Joao ArisKOK, FernandoNOBREGA, Paulo RibeiroGRACA, Carla RenataMORITA, Maria da Penha AnaniasESTEPHAN, Eduardo de Paula2023-12-152023-12-152023NEUROMUSCULAR DISORDERS, v.33, n.8, p.692-696, 20230960-8966https://observatorio.fm.usp.br/handle/OPI/57456Mitochondrial DNA depletion syndrome type 11 (MTDPS11) is caused by pathogenic variants in MGME1 gene. We report a woman, 40-year-old, who presented slow progressive drop eyelid at 11-year old with, learning difficulty and frequent falls. Phisical examination revealed: mild scoliosis, elbow hyperextensibility, flat feet, chronic progressive external ophthalmoplegia with upper eyelid ptosis, diffuse hypotonia, and weakness of arm abduction and neck flexion. Investigation evidenced mild serum creatine kinase increase and glucose intolerance; second-degree atrioventricular block; mild mixed type respiratory disorder and atrophy and granular appearance of the retinal pigment epithelium. Brain magnetic resonance showed cerebellar atrophy. Muscle biopsy was compatible with mitochondrial myopathy. Genetic panel revealed a homozygous pathogenic variant in the MGME1 gene, consistent with MTDPS11 (c.862C > T; p.Gln288 *). This case of MTDPS11 can contribute to the phenotypic characterization of this ultra-rare mitochondrial disorder, presenting milder respiratory and nutritional involvement than the previously reported cases, with possible additional features.(c) 2023 Elsevier B.V. All rights reserved.engrestrictedAccessMitochondrial diseasesChronic progressive external ophthalmoplegiamtDNA depletion syndromeMGME1mutationssequencemgme1articleCopyright PERGAMON-ELSEVIER SCIENCE LTD10.1016/j.nmd.2023.06.004Clinical NeurologyNeurosciences1873-2364