propose

# Novel Therapeutic Hypotheses: Stress Granule Dynamics in Neurodegeneration

## Hypothesis 1: Temporal G3BP1 Inhibition During Recovery Phase Only

**Description:** G3BP1 serves as the master nucleation hub for stress granule (SG) assembly, but chronic SG persistence drives TDP-43 pathology. I propose that *acute, phase-specific* inhibition of G3BP1 during the post-stress recovery window—allowing normal SG formation during stress but promoting rapid dissolution afterward—could prevent neurodegeneration without impairing acute stress survival. This temporal targeting exploits the mechanistic separation between SG initiation (G3BP1-dependent) and SG persistence (maintenance-dependent).

**Target:** G3BP1/G3BP2 (RNA granule nucleator)

**Supporting Evidence:**
- G3BP1 is the central scaffold protein required for SG nucleation via phase separation (PMID: **28264989**)
- Pathological SG persistence recruits TDP-43 and drives ALS/FTD pathology (PMID: **25943887**, **25503966**)
- G3BP1 knockout mice are embryonically lethal but G3BP1/2 double knockout in adult neurons permits viability while impairing stress responses, demonstrating the therapeutic window (PMID: **30258054**)

**Predicted Outcomes:** Selective G3BP1 inhibition post-stress would preserve translational arrest during acute stress (protective) while preventing pathological SG accumulation. Expected: reduced TDP-43 inclusions, preserved neuronal viability under chronic stress paradigms.

**Confidence:** 0.65

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## Hypothesis 2: DYRK3 Kinase Activation to Restore SG Dissolution Kinetics

**Description:** DYRK3 is