A missense allele of PEX5 is responsible for the defective import of PTS2 cargo proteins into peroxisomes.

ATP-Binding Cassette Transporters / metabolism Animals Biological Transport, Active Cataract / congenital Chromosomes, Human, Pair 12 Consanguinity Female Genetic Linkage Humans Lens, Crystalline / metabolism Male Mice Mice, Knockout Mutation, Missense Peroxisomal Targeting Signals Peroxisome-Targeting Signal 1 Receptor / genetics Peroxisomes / metabolism Sequestosome-1 Protein / metabolism Exome Sequencing

Journal

Human genetics

ISSN: 1432-1203

Titre abrégé: Hum Genet

Pays: Germany

ID NLM: 7613873

Informations de publication

Date de publication:
Apr 2021

Historique:

received: 05 05 2020

accepted: 07 11 2020

pubmed: 4 1 2021

medline: 31 3 2021

entrez: 3 1 2021

Statut: ppublish

Résumé

Peroxisomes, single-membrane intracellular organelles, play an important role in various metabolic pathways. The translocation of proteins from the cytosol to peroxisomes depends on peroxisome import receptor proteins and defects in peroxisome transport result in a wide spectrum of peroxisomal disorders. Here, we report a large consanguineous family with autosomal recessive congenital cataracts and developmental defects. Genome-wide linkage analysis localized the critical interval to chromosome 12p with a maximum two-point LOD score of 4.2 (θ = 0). Next-generation exome sequencing identified a novel homozygous missense variant (c.653 T > C; p.F218S) in peroxisomal biogenesis factor 5 (PEX5), a peroxisome import receptor protein. This missense mutation was confirmed by bidirectional Sanger sequencing. It segregated with the disease phenotype in the family and was absent in ethnically matched control chromosomes. The lens-specific knockout mice of Pex5 recapitulated the cataractous phenotype. In vitro import assays revealed a normal capacity of the mutant PEX5 to enter the peroxisomal Docking/Translocation Module (DTM) in the presence of peroxisome targeting signal 1 (PTS1) cargo protein, be monoubiquitinated and exported back into the cytosol. Importantly, the mutant PEX5 protein was unable to form a stable trimeric complex with peroxisomal biogenesis factor 7 (PEX7) and a peroxisome targeting signal 2 (PTS2) cargo protein and, therefore, failed to promote the import of PTS2 cargo proteins into peroxisomes. In conclusion, we report a novel missense mutation in PEX5 responsible for the defective import of PTS2 cargo proteins into peroxisomes resulting in congenital cataracts and developmental defects.

Identifiants

DOI: 10.1007/s00439-020-02238-z PMID: 33389129

pubmed: 33389129

doi: 10.1007/s00439-020-02238-z

pii: 10.1007/s00439-020-02238-z

doi:

Substances chimiques

ABCD3 protein, human 0

ATP-Binding Cassette Transporters 0

PEX5 protein, human 0

Peroxisomal Targeting Signals 0

Peroxisome-Targeting Signal 1 Receptor 0

SQSTM1 protein, human 0

Sequestosome-1 Protein 0

Types de publication

Journal Article

Langues

eng

Sous-ensembles de citation

Pagination

649-666

Subventions

Organisme : NEI NIH HHS

ID : R01EY022714

Pays : United States

Organisme : NEI NIH HHS

ID : R01EY022714

Pays : United States

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