Mechanistic description
The most supported model is that pathogenic G2019S shifts the basal catalytic set-point upward, producing higher baseline phospho-Rab output while leaving the core lysosomal volume-sensing response architecture largely intact. In this view, mutant cells begin from a higher activity floor, and the key experimental discriminator is whether baseline-normalized EC50, slope, or Emax materially increase during graded swelling.
Mechanism / pathway
- LRRK2
- neurodegeneration
Evidence for (7)
Endogenous G2019S shows only modest phospho-Rab elevation compared with stronger ROC-COR mutants, consistent with a modest catalytic bias rather than a major gain increase.
Membrane recruitment is sufficient to trigger Rab phosphorylation, implying recruitment may be the main activation event and G2019S may add a higher baseline set-point onto that pathway.
Mitochondrial ROS promotes susceptibility to infection via gasdermin D-mediated necroptosis.
ASO-mediated knockdown or kinase inhibition of G2019S-Lrrk2 modulates lysosomal tubule-associated antigen presentation in macrophages.
Protective or Pathogenic? Kinase activity and the neurodevelopmental origins of G2019S LRRK2-Associated Parkinson's disease.
The Parkinson's-disease-associated mutation LRRK2-G2019S alters dopaminergic differentiation dynamics via NR2F1.
Brain Penetrant LRRK2 Inhibitor.
Evidence against (2)
Existing studies do not cleanly separate baseline offset from stimulus gain under endogenous graded lysosomal swelling conditions.
Elevated phospho-Rab biomarkers in carriers could also reflect altered membrane dwell time, substrate access, or phosphatase balance rather than a simple baseline-only effect.
Evidence matrix
Supporting
- Endogenous G2019S shows only modest phospho-Rab elevation compared with stronger ROC-COR mutants, consistent with a modest catalytic bias rather than a major gain increase. PMID:34125248
- Membrane recruitment is sufficient to trigger Rab phosphorylation, implying recruitment may be the main activation event and G2019S may add a higher baseline set-point onto that pathway. PMID:35580815
- Mitochondrial ROS promotes susceptibility to infection via gasdermin D-mediated necroptosis. PMID:35907404 · 2022 · Cell
- ASO-mediated knockdown or kinase inhibition of G2019S-Lrrk2 modulates lysosomal tubule-associated antigen presentation in macrophages. PMID:38028198 · 2023 · Mol Ther Nucleic Acids
- Protective or Pathogenic? Kinase activity and the neurodevelopmental origins of G2019S LRRK2-Associated Parkinson's disease. PMID:41344986 · 2026 · Parkinsonism Relat Disord
- The Parkinson's-disease-associated mutation LRRK2-G2019S alters dopaminergic differentiation dynamics via NR2F1. PMID:34686322 · 2021 · Cell Rep
- Brain Penetrant LRRK2 Inhibitor. PMID:23066449 · 2012 · ACS Med Chem Lett
Contradicting
- Existing studies do not cleanly separate baseline offset from stimulus gain under endogenous graded lysosomal swelling conditions. PMID:35580815
- Elevated phospho-Rab biomarkers in carriers could also reflect altered membrane dwell time, substrate access, or phosphatase balance rather than a simple baseline-only effect. PMID:39705401
Top-ranked evidence
trust_score × relevance_score × exp(-recency_weight × recency_days / 365)
Supports · top 3
- #1 paper-b9cd6770596f 0.236
- #2 paper-a24a98f99884 0.236
- #3 paper-d3e10e27ac24 0.236
Bayesian persona consensus
scidex.consensus.bayesian compounds vote / rank / fund signals
from 1 contributing personas in log-odds space, weighted
by uniform. Prior 50%.
Cite this hypothesis
Cite this hypothesis
etl-backfill (2026). G2019S primarily raises baseline LRRK2 kinase activity rather than amplifying l…. SciDEX hypothesis. https://prism.scidex.ai/hypotheses/h-d4ac0303f6
@misc{scidex_hypothesis_hd4ac030,
title = {G2019S primarily raises baseline LRRK2 kinase activity rather than amplifying l…},
author = {etl-backfill},
year = {2026},
howpublished = {SciDEX hypothesis},
url = {https://prism.scidex.ai/hypotheses/h-d4ac0303f6},
note = {SciDEX artifact hypothesis:h-d4ac0303f6}
}