An overlooked distal regulatory signal on a shared haplotype drives the neuroinflammatory cascade underlying GBA1-associated Parkinson's disease

13 Jul 20264 min read0 viewsVerified Feed

GIST (Key Takeaways)

BACKGROUND The persistent puzzle of how GBA1 coding variants underlying monogenic Gaucher disease confer such strong risk for polygenic Parkinson's disease (PD) remains unresolved. Here, we sought to resolve this long-standing paradox.
METHODS Using the Parkinson's Progression Markers Initiative resource, we integrated whole-genome sequencing from sporadic PD cases and controls with matched transcriptomic, epigenomic and cerebrospinal fluid proteomic data across Northern European and Ashkenazi Jewish populations. Ancestry-specific genetic maps enabled precise integration of disease localisation with eQTL, pQTL and chromatin architecture, linking genetic association to molecular mechanism, while evolutionary genetic analyses resolved the regional haplotypic architecture.
RESULTS We identified a PD-associated regulatory signal located 150 kilobases distal to GBA1 that robustly replicated across all molecular datasets and both ancestries. Integrative mapping identified rs77268551-G as the candidate regulatory variant, which we show resides on an extended haplotype also carrying the Gaucher disease-causing N370S allele.
Evolutionary analyses reveal a clear signature of recent positive selection acting on the Gaucher disease-causing N370S allele, giving rise to this extended shared haplotype that likely concealed the underlying distal PD-associated regulatory signal.

Clinical Editorial

bioRxiv (Biomedical Preprints) published a clinical update in Research Highlights on 13 Jul 2026.

The item focuses on An overlooked distal regulatory signal on a shared haplotype drives the neuroinflammatory cascade underlying GBA1-associated Parkinson's disease.

Review the original article for the full source wording and details.