ArticleNeurogenetics2026
Expanding the genotypic spectrum of combined oxidative phosphorylation deficiency 54.
Article in Neurogenetics, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Biallelic hypomorphic variants in PRORP cause the rare autosomal recessive disorder combined oxidative phosphorylation deficiency type 54 (COXPD54). COXPD54 encompasses a clinical spectrum of sensorineural hearing loss and ovarian insufficiency (Perrault syndrome) to leukodystrophy with developmental delay and epilepsy. Here, we report two new affected individuals with biallelic PRORP variants with clinical features consistent with COXPD54. One individual was homozygous for c.1505G > A p.Arg502Gln, whereas the other was compound heterozygous for c.1510C > T, p.His504Tyr and c.893C > A, p.Ser298Ter (NM_014672.4). In vitro tRNA processing assays revealed decreased mitochondrial 5′ tRNA leader cleavage by human RNase P complex with the two novel missense PRORP metallonuclease domain variants. These data provide further evidence that biallelic PRORP variants disrupt 5’ tRNA leader cleavage and are associated with a pleiotropic phenotype of COXPD54.
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