249: PCM1 links centrosome asymmetry to endosome dynamics

Zhao X et al., Nature Communications - In developing neural progenitors PCM1 localizes to the mother centrosome and to Notch ligand-containing endosomes, promoting Par-3/dynein assembly and Rab5-to-Rab11 trafficking to bias posterior-directed endosome segregation and preserve progenitor fate. Key terms: PCM1, centrosome asymmetry, endosome dynamics, radial glia progenitors, Notch signaling.

Study Highlights:
Pcm1 is asymmetrically enriched at the posterior mother centrosome (Cep83+) in zebrafish radial glia progenitors and is also found on central-zone Notch ligand (Dld)-containing endosomes. In vivo time-lapse imaging and expansion microscopy show Pcm1 puncta move with Dld endosomes and promote posterior-directed polarized dynamics. Loss of pcm1 disrupts Rab5b-to-Rab11a trafficking, reduces Par-3 and dynein co-assembly on recycling endosomes, lowers Notch signaling, and shifts divisions toward neuron–neuron outcomes at the expense of progenitors. Similar PCM1–PARD3–CEP83–RAB11 associations and asymmetric PCM1 distribution are observed in human iPSC-derived neural rosettes and cortical organoids.

Conclusion:
PCM1 couples centrosome asymmetry to polarized recycling endosome trafficking to enforce asymmetric Notch signaling and maintain radial glia progenitor fate

Music:
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Article title:
PCM1 coordinates centrosome asymmetry with polarized endosome dynamics to regulate daughter cell fate

First author:
Zhao X

Journal:
Nature Communications

DOI:
10.1038/s41467-025-65756-2

Reference:
Zhao X., Mouilleau V., Wang Y., Solak A.C., Garcia J.Q., Chen X., Shi X., Wilkinson C.J., Royer L.A., Dong Z. & Guo S. PCM1 coordinates centrosome asymmetry with polarized endosome dynamics to regulate daughter cell fate. Nature Communications. 2025;16:10728. https://doi.org/10.1038/s41467-025-65756-2

License:
This episode is based on an open-access article published under the Creative Commons Attribution 4.0 International License (CC BY 4.0) – https://creativecommons.org/licenses/by/4.0/

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QC:
This episode was checked against the original article PDF and publication metadata for the episode release published on 2026-01-04.

QC Scope:
- article metadata and core scientific claims from the narration
- excludes analogies, intro/outro, and music
- transcript coverage: Audited core scientific claims and mechanisms described in the transcript: PCM1 association with centrosome age, Dld endosome polarization, Par-3/dynein loading on recycling endosomes, Rab5b→Rab11a maturation, cross-species conservation in hiPSC-derived neural progenitors, and clonal division outcomes.
- transcript topics: Asymmetric localization of PCM1 at the posterior mother centrosome (Cep83+); Delta-like endosome (Dld) polarization and Notch signaling asymmetry; Co-localization and interaction of Par-3 and dynein on recycling endosomes; Rab5b to Rab11a endosome maturation on Dld endosomes; Conservation of PCM1 asymmetry and endosome dynamics in hiPSC-derived neural progenitors; Clonal analysis of RGP divisions: P/P, P/N, N/N outcomes

QC Summary:
- factual score: 10/10
- metadata score: 10/10
- supported core claims: 6
- claims flagged for review: 0
- metadata checks passed: 4
- metadata issues found: 0

Metadata Audited:
- article_doi
- article_title
- article_journal
- license

Factual Items Audited:
- PCM1 enriched at the posterior mother centrosome Cep83+
- PCM1 localizes to the central zone near Delta-containing endosomes (Dld) and moves with Dld endosomes
- Loss of pcm1 disrupts endosome dynamics and increases neuronal differentiation at the expense of progenitor self-renewal
- PCM1 facilitates the Rab5b to Rab11a transition and promotes Par-3 and dynein assembly on recycling endosomes
- Conserved PCM1–CEP83–RAB11 associations observed in human hiPSC-derived neural progenitors and organoids
- PCM1 acts as a bridge linking centrosome age to polarized endosome trafficking and Notch signaling to preserve progenitor fate

QC result: Pass.