RABENOSYN separation-of-function mutations uncouple endosomal recycling from lysosomal degradation, causing a distinct Mendelian disorder

Franziska Paul, Calista Ng, Umar Bin Mohamad Sahari, Shahriar Nafissi, Yalda Nilipoor, Ali Reza Tavasoli, Carine Bonnard, Pui Mun Wong, Nasrinsadat Nabavizadeh, Umut Altunoğlu, Mehrdad A. Estiar, Charles B. Majoie, Hane Lee, Stanley F. Nelson, Ziv Gan-Or, Guy A. Rouleau, Paul P. Van Veldhoven, Rami Massie, Raoul C. Hennekam, Ariana KariminejadBruno Reversade

Research output: Contribution to journalArticlepeer-review

Abstract

Rabenosyn (RBSN) is a conserved endosomal protein necessary for regulating internalized cargo. Here, we present clinical, genetic, cellular and biochemical evidence that two distinct RBSN missense variants are responsible for a novel Mendelian disorder consisting of progressive muscle weakness, facial dysmorphisms, ophthalmoplegia and intellectual disability. Using exome sequencing, we identified recessively acting germline alleles p.Arg180Gly and p.Gly183Arg, which are both situated in the FYVE domain of RBSN. We find that these variants abrogate binding to its cognate substrate phosphatidylinositol 3-phosphate (PI3P) and thus prevent its translocation to early endosomes. Although the endosomal recycling pathway was unaltered, mutant p.Gly183Arg patient fibroblasts show accumulation of cargo tagged for lysosomal degradation. Our results suggest that these variants are separation-of-function alleles, which cause a delay in endosomal maturation without affecting cargo recycling. We conclude that distinct germline mutations in RBSN cause non-overlapping phenotypes with specific and discrete endolysosomal cellular defects.
Original languageEnglish (US)
Pages (from-to)3729-3740
Number of pages12
JournalHuman Molecular Genetics
Volume31
Issue number21
DOIs
StatePublished - Oct 28 2022
Externally publishedYes

Bibliographical note

Generated from Scopus record by KAUST IRTS on 2023-02-15

ASJC Scopus subject areas

  • Genetics
  • Molecular Biology
  • Genetics(clinical)

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