Nardecchia F, Carrozzo R, Innocenti A, Torraco A, Zaccaria V, Rizza T, Pisani F, Bertini E, Leuzzi V. Biallelic variants in GTPBP3: New patients, phenotypic spectrum, and outcome.
Ann Clin Transl Neurol 2024;
11:819-825. [PMID:
38327089 DOI:
10.1002/acn3.51980]
[Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2023] [Revised: 11/28/2023] [Accepted: 12/03/2023] [Indexed: 02/09/2024] Open
Abstract
INTRODUCTION
COXPD23 is a rare mitochondrial disease caused by biallelic pathogenic variants in GTPBP3. We report on two siblings with a mild phenotype.
CASE REPORTS
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.
DISCUSSION
Reviewed cases point toward clustering around two prevalent phenotypes: an early-onset 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.
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