How does the intron-retained RNA isoform mechanistically reduce glucocerebrosidase protein levels and activity?

neurodegeneration investigating
Open a bounty challenge Fund this gap and accept submissions. SPEC-033.
Composite
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Novelty
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Mechanistic
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Druggability
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Priority
87%
Importance
85%
Tractability
90%
Market price
50%

Description

While the study shows the variant creates intron-retained transcripts that correlate with reduced enzyme activity, the precise molecular mechanism linking aberrant RNA to protein reduction is not explained. This mechanistic gap limits therapeutic target identification.

Gap type: unexplained_observation Source paper: African ancestry neurodegeneration risk variant disrupts an intronic branchpoint in GBA1. (2024, Nature structural & molecular biology, PMID:39668204)

Resolution criteria

Resolution requires: (1) RNA-seq of GBA-associated Parkinson’s disease vs idiopathic PD vs controls, identifying intron-retained isoform in GBA and its abundance; (2) functional study in neurons where modulating the retained intron changes GBA protein levels and alpha-synuclein aggregation; (3) CSF biomarker study showing correlation between isoform levels and disease severity. Descriptive transcriptomics without functional follow-up is insufficient.