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© Aurelien Bayot
Confocal micrograph of HeLa cells visulazed by indirect immunocytochemistry for mitochondria in green with an Anti-TOMM40 antibody and nuclei in blue with Dapi.
Publication : Molecular genetics and metabolism

Mitochondrial dysfunction caused by novel ATAD3A mutations.

Scientific Fields
Diseases
Organisms
Applications
Technique

Published in Molecular genetics and metabolism - 01 Jan 2021

Dorison N, Gaignard P, Bayot A, Gelot A, Becker PH, Fourati S, Lebigot E, Charles P, Wai T, Therond P, Slama A,

Link to Pubmed [PMID] – 32933822

Link to DOI – S1096-7192(20)30193-110.1016/j.ymgme.2020.09.002

Mol Genet Metab ; 131(1-2): 107-113

Mitochondrial respiratory chain integrity depends on a number of proteins encoded by nuclear and mitochondrial genomes. Mutations of such factors can result in isolated or combined respiratory chain deficits, some of which can induce abnormal morphology of the mitochondrial network or accumulation of intermediary metabolites. Consequently, affected patients are clinically heterogeneous, presenting with central nervous system, muscular, or neurodegenerative disorders. ATAD3A is a nuclear-encoded ATPase protein of the AAA+ family and has been localized to the inner mitochondrial membrane. Recently reported mutations or large deletions in the ATDA3A gene in patients have been shown to induce altered mitochondrial structure and function and abnormal cholesterol metabolism in a recessive or dominant manner. Here, we report two siblings presenting axonal sensory-motor neuropathy associated with neonatal cataract. Genetic analyses identified two novel mutations in ATAD3A; a point mutation and an intronic 15 bp deletion affecting splicing and leading to exon skipping. Biochemical analysis in patient cells and tissues showed abnormal function of the mitochondrial respiratory chain in muscle and abnormal mitochondrial cristae structure. These new cases underline the large spectrum of biochemical and clinical presentations of ATAD3A deficiency and the different modes of inheritance, making it an atypical mitochondrial disorder.

https://pubmed.ncbi.nlm.nih.gov/32933822