SLC25A42-Related Mitochondrial Disorder: New Cases and Literature Review.

SLC25A42 encodes a mitochondrial carrier that is responsible for the import of CoA into mitochondria. Biallelic pathogenic variants in SLC25A42 have been associated with a recently described mitochondrial disorder characterized by encephalomyopathy with variable severity. To date, 24 affected individuals from 16 different families have been reported. Most are of Arab descent who harbor the founder variant in SLC25A42 (c.871A>G, p.Asn291Asp). In this report, we present 23 additional individuals from 19 unrelated families and their clinical, radiological, and molecular findings. We show again that SLC25A42-related mitochondrial disorder is associated with extremely variable severity. Some individuals with mild presentation may be unrecognized, while others are prone to metabolic decompensations with neuro-regression and irreversible neurological insult, making early diagnosis important.