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Preprint WatchMildJune 20th, 2026

CRISPR/Cas9-based knockout screening revealed GSK3beta as a key regulator for structural plasticity of axon initial segment

Du, Y.; Egawa, R.; Adachi, R.; Motohara, K.; Furumichi, K.; Fukaya, R.; Kuba, H.

GSK3beta-dependent microtubule remodeling drives axon initial segment structural plasticity, with knockout impairing and constitutively active GSK3beta facilitating the change.

Mild contradiction

1 prior failure

One documented clinical failure (Phase 1 or 2) overlaps with the claimed mechanism.

The indexed GSK3B failure on file is lithium in UNC13A rs12608932 C/C amyotrophic lateral sclerosis, a biomarker-defined program recorded as a biomarker failure (lithium-unc13a-magnet-als-biomarker-failure). This preprint adds mechanistic detail on GSK3beta, showing it drives axon initial segment remodeling through microtubule dynamics in a developmental avian model. It neither replicates nor contradicts the clinical result, because it does not test lithium, the UNC13A stratification, or an ALS setting. The relevance is that GSK3beta sits in pleiotropic neuronal pathways far from the biomarker hypothesis that the indexed trial used, which is consistent with the difficulty of pinning a clinical effect to this kinase.

Abstract excerpt

The axon initial segment (AIS) undergoes structural plasticity to tune neuronal excitability, yet the underlying molecular mechanisms remain unclear. An in vivo CRISPR/Cas9 knockout platform identified that knockout of GSK3beta or Tau impaired developmental AIS shortening, while constitutively active GSK3beta facilitated shortening, an effect suppressed by microtubule stabilization. The findings identify GSK3beta-dependent microtubule remodeling as a mechanism underlying developmental AIS shortening.

Matching Claidex post-mortems

1 of 1 indexed

This is an automated contradiction flag, not an editorial judgment on the preprint's quality. Flags identify where the preclinical literature and the clinical failure record diverge.