446: Cilia, Synuclein, and Survival: G51D Mice Reveal a Shared Parkinson’s Pathway

Lin Y‑E et al., PNAS - Knock‑in SncaG51D/G51D mice show selective loss of primary cilia in specific striatal interneurons, astrocytes, piriform cortex PV cells and olfactory basal stem cells, with concomitant reduction in Hedgehog‑dependent neurotrophic signaling linked to Parkinson’s disease vulnerabilities. Key terms: alpha-synuclein, primary cilia, neurotrophic signaling, Parkinson’s disease, G51D mouse.

Study Highlights:
Using SncaG51D/G51D knock‑in mice, the authors document selective loss of primary cilia in striatal cholinergic and parvalbumin interneurons and in ALDH1L1+ astrocytes while medium spiny neuron ciliation is preserved. Cilia loss associates with reduced Ptch1 expression and decreased production of neurotrophic factors (GDNF, NRTN, BDNF), indicating impaired Hedgehog signaling. PV neurons in the piriform cortex and horizontal basal cells in the olfactory epithelium also lose cilia and show reduced NRTN, whereas multiciliated olfactory sensory neurons remain intact. Higher phospho-Ser129 α‑synuclein correlates with reduced ciliation within ChAT neurons but does not predict vulnerability across all cell types.

Conclusion:
G51D α‑synuclein drives cell type–selective loss of primary cilia and impaired cilia‑dependent neurotrophic signaling, highlighting disrupted ciliary signaling as a convergent pathogenic pathway in Parkinson’s disease.

Music:
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Article title:
Selective loss of primary cilia and neurotrophic signaling in G51D α- synuclein mice highlights a common pathway to Parkinson’s disease

First author:
Lin Y‑E

Journal:
PNAS

DOI:
10.1073/pnas.2619797123

Reference:
Lin Y‑E, Chiang C‑Y, et al., Selective loss of primary cilia and neurotrophic signaling in G51D α‑synuclein mice highlights a common pathway to Parkinson’s disease. Proc Natl Acad Sci U S A. 2026;123:e2619797123. doi:10.1073/pnas.2619797123

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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Episode link: https://basebybase.com/episodes/cilia-synuclein-g51d-parkinsons-pathway

QC:
This episode was checked against the original article PDF and publication metadata for the episode release published on 2026-08-23.

QC Scope:
- article metadata and core scientific claims from the narration
- excludes analogies, intro/outro, and music
- transcript coverage: Substantive auditing of the transcript’s reporting of the G51D α-synuclein mouse model findings, including: cell-type–specific cilia loss, Hedgehog signaling impairment, neurotrophic factor downregulation, olfactory system involvement (piriform cortex and olfactory epithelium), pS129-α-synuclein correlations, and thera
- transcript topics: G51D α-synuclein knock-in mouse model; Cell-type specific loss of primary cilia in striatum (ChAT and PV interneurons) and astrocytes; Hedgehog signaling impairment and Ptch1 transcription; Downregulation of neurotrophic factors: GDNF, NRTN, BDNF; Olfactory system involvement: piriform cortex PV neurons and Neurturin downregulation; Olfactory epithelium ciliopathy: horizontal basal cells vs olfactory sensory neurons

QC Summary:
- factual score: 10/10
- metadata score: 10/10
- supported core...

Chapters

• (00:00:20) - What is the silent process of Parkinson's disease?
• (00:03:16) - Parkinson's disease: The genetic mystery
• (00:07:35) - Parkinson's in a mouse
• (00:13:05) - Parkinson's neurodegeneration causes loss of smell
• (00:16:43) - Parkinson's disease's toxic alpha synuclein paradox
• (00:24:03) - Parkinson's disease: The cellular blackout
• (00:25:47) - Bring Back the Signal, Let it Come Alive