274: RPE MCT2: A metabolic gene-agnostic approach to preserve cones in RP

PNAS - RPE-specific MCT2 gene delivery preserves cones and vision in retinitis pigmentosa models

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Article title:
RPE-specific MCT2 expression promotes cone survival in models of retinitis pigmentosa

Journal:
PNAS

DOI:
10.1073/pnas.2421978122

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 2026-01-29.

QC Scope:
- article metadata and core scientific claims from the narration
- excludes analogies, intro/outro, and music
- transcript coverage: Audited transcript sections covering: metabolic mechanism (RPE lactate uptake via MCT2 and glucose sparing), vector design (AAV8.Best1.MCT2), RP animal models and cone survival/function outcomes, FLIM-based lactate/glucose sensors (LiLac, GlucoSnFR-TS), MCT2 localization to apical/basal RPE membranes, observed species-
- transcript topics: RPE-specific MCT2 metabolic reprogramming; Retina metabolism: lactate, glucose, and NAD+ dynamics in RP; AAV8.Best1.MCT2 vector design and RPE specificity; RP models: S334ter rat, FVB mouse, P23H mouse; Cone survival and functional outcomes (cone counts and optomotor assay); FLIM-based lactate and glucose sensors (LiLac, GlucoSnFR-TS)

QC Summary:
- factual score: 10/10
- metadata score: 8/10
- supported core claims: 6
- claims flagged for review: 0
- metadata checks passed: 3
- metadata issues found: 1

Metadata Audited:
- article_doi
- article_title
- article_journal
- license

Factual Items Audited:
- RPE-specific MCT2 expression increases cone survival across RP models (rat S334ter; mouse FVB and P23H).
- MCT2 expression transiently preserves cone function in P23H mice (optomotor results at P40; diminished by P53).
- MCT2 localizes to apical and basal membranes of the RPE after AAV delivery.
- FLIM sensors show higher intracellular lactate and greater glucose accumulation in MCT2-expressing RPE, consistent with reduced glycolysis and glucose sparing for cones.
- Three RP mutations/models tested support a gene-agnostic approach.
- Toxicity observed in mice but not rats; potential translational bottleneck due to species-specific responses.

QC Flagged Items (audited and not fully supported):
- license: metadata does not match the canonical article record. License naming differs between metadata snapshot and article description; both refer to CC BY variants.
Internal QC note: manual editorial review is recommended before publication.

QC result: Warning. Items above were flagged during automated QC; the editorial team reviewed them before release.