Redefining infantile-onset multisystem phenotypes of coenzyme Q₁₀-deficiency in the next-generation sequencing era

Abstract

Primary coenzyme Q₁₀ (CoQ₁₀) deficiency encompasses a subset of mitochondrial diseases caused by mutations affecting proteins involved in the CoQ₁₀ biosynthetic pathway. One of the most frequent clinical syndromes associated with primary CoQ₁₀ deficiency is the severe infantile multisystemic form, which, until recently, was underdiagnosed. In the last few years, the availability of genetic screening through whole exome sequencing and whole genome sequencing has enabled molecular diagnosis in a growing number of patients with this syndrome and has revealed new disease phenotypes and molecular defects in CoQ₁₀ biosynthetic pathway genes. Early genetic screening can rapidly and non-invasively diagnose primary CoQ₁₀ deficiencies. Early diagnosis is particularly important in cases of CoQ₁₀ deficient steroid-resistant nephrotic syndrome, which frequently improves with treatment. In contrast, the infantile multisystemic forms of CoQ₁₀ deficiency, particularly when manifesting with encephalopathy, present therapeutic challenges, due to poor responses to CoQ₁₀ supplementation. Administration of CoQ₁₀ biosynthetic intermediate compounds is a promising alternative to CoQ₁₀; however, further pre-clinical studies are needed to establish their safety and efficacy, as well as to elucidate the mechanism of actions of the intermediates. Here, we review the molecular defects causes of the multisystemic infantile phenotype of primary CoQ₁₀ deficiency, genotype-phenotype correlations, and recent therapeutic advances.

Keywords

Coenzyme Q₁₀ / coenzyme Q₁₀ deficiency / coenzyme Q biosynthesis / nephrotic syndrome / cardiopathy / encephalopathy

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