WDR89

WDR89 is the human orthologue of yeast Bcl1 and localizes in the proximity of the large ribosomal subunit protein RPL10A (the orthologue of yeast Rpl1), consistent with a conserved role as a dedicated chaperone facilitating handling and loading of the Rpl1/RPL10A ribosomal protein, a function validated for the yeast orthologue by direct pull-down and in vitro reconstitution of a trimeric complex [PMID:bio_10.1101_2025.09.18.677003]. In vivo, knockdown of Wdr89 in mice produces a thinner corpus callosum, placing it among WDR genes required for brain connectivity and neuronal morphology (PMID:29078390), though the molecular basis of this phenotype is not characterized in the available corpus. Beyond the proximity relationship to RPL10A and the murine phenotype, no direct biochemical mechanism for human WDR89 has been established in the available corpus.

1. 2017 Low

   Established the first in vivo phenotype for WDR89 by asking whether it is among WDR genes needed for brain wiring, showing its loss disrupts a major axonal commissure.

   Evidence In vivo mouse inactivation screen across 26 WDR genes with corpus callosum morphology assessment

   PMID:29078390

   Open questions at the time

   • Phenotypic readout only; no molecular mechanism described for WDR89
   • Does not establish whether the corpus callosum defect is cell-autonomous or downstream of a ribosomal/biogenesis role
   • No cellular localization or interaction data for WDR89 in this study
2. 2025 Medium

   Addressed the molecular function of WDR89 by mapping its protein neighborhood, positioning it near RPL10A and implying a conserved chaperone role for the large ribosomal subunit protein.

   Evidence TurboID-based proximity labelling (proxiOME) in human cells; yeast ortholog Bcl1 verified by direct pull-down and in vitro reconstitution of a trimeric complex (preprint)

   PMID:bio_10.1101_2025.09.18.677003

   Open questions at the time

   • Human WDR89 finding rests on a single proximity-labelling observation without direct functional follow-up
   • Direct binding and reconstitution were shown for the yeast orthologue, not human WDR89 itself
   • No demonstration that WDR89 loss impairs RPL10A loading or 60S subunit biogenesis in human cells
3. 2026 Low

   Tested whether WDR89 physically engages an environmental PFAS compound, finding thermal stabilization upon GenX treatment consistent with direct binding.

   Evidence Thermal proteome profiling and CETSA with molecular docking validation

   PMID:41883243

   Open questions at the time

   • Thermal stabilization and docking are indirect evidence of binding awaiting orthogonal biophysical confirmation
   • No functional consequence of the WDR89-PFAS interaction established
   • Single study; relevance to the ribosomal/chaperone role unknown

• Whether WDR89 functionally acts as a chaperone loading RPL10A onto pre-60S particles in human cells, and how this connects to the corpus callosum phenotype, remains unresolved.
• No direct binding or reconstitution demonstrated for human WDR89
• No link established between ribosomal function and the neuronal phenotype
• No structural model of human WDR89 in the available corpus