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Biochemical and genetic characterization of an unusual mild PEX3-related Zellweger spectrum disorder
Kathrine Bjørgo1, Roar Fjær1, Hanne Håberg Mørk1
1Department of Medical Genetics, Oslo University Hospital, P.B 4956 Nydalen, 0424 Oslo, Norway.
Abstract:
Patients with PEX3 mutations usually present with a severe form of Zellweger spectrum disorder with death in the first year of life. Whole exome sequencing in adult siblings with intellectual disability revealed a homozygous variant in PEX3 that abolishes the normal splice site. A cryptic acceptor splice site is activated and an in-frame transcript with a deletion is produced. This transcript translates into a protein with residual activity explaining the relatively mild peroxisomal abnormalities and clinical phenotype.
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