{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,4,10]],"date-time":"2026-04-10T06:27:02Z","timestamp":1775802422020,"version":"3.50.1"},"reference-count":10,"publisher":"Wiley","issue":"3","license":[{"start":{"date-parts":[[2024,2,7]],"date-time":"2024-02-07T00:00:00Z","timestamp":1707264000000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/creativecommons.org\/licenses\/by-nc-nd\/4.0\/"}],"content-domain":{"domain":["onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["Ann Clin Transl Neurol"],"published-print":{"date-parts":[[2024,3]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:sec><jats:title>Introduction<\/jats:title><jats:p>COXPD23 is a rare mitochondrial disease caused by biallelic pathogenic variants in <jats:italic>GTPBP3<\/jats:italic>. We report on two siblings with a mild phenotype.<\/jats:p><\/jats:sec><jats:sec><jats:title>Case reports<\/jats:title><jats:p>The young boy presented with global developmental delay, ataxic gait and upper limbs tremor, and the older sister with absence seizures and hypertrophic cardiomyopathy. Respiratory chain impairment was confirmed in muscle.<\/jats:p><\/jats:sec><jats:sec><jats:title>Discussion<\/jats:title><jats:p>Reviewed cases point toward clustering around two prevalent phenotypes: an early\u2010onset presentation with severe fatal encephalopathy and a late milder presentation with global developmental delay\/ID and cardiopathy, with the latter as, is the main feature. Our patients showed an intermediate phenotype with intrafamilial variability.<\/jats:p><\/jats:sec>","DOI":"10.1002\/acn3.51980","type":"journal-article","created":{"date-parts":[[2024,2,8]],"date-time":"2024-02-08T07:04:20Z","timestamp":1707375860000},"page":"819-825","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":4,"title":["Biallelic variants in <i>GTPBP3<\/i>: New patients, phenotypic spectrum, and outcome"],"prefix":"10.1002","volume":"11","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-0808-2827","authenticated-orcid":false,"given":"Francesca","family":"Nardecchia","sequence":"first","affiliation":[{"name":"Unit of Child Neurology and Psychiatry, Department of Human Neuroscience Sapienza University of Rome  Rome 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