What mechanisms determine when complement-mediated synaptic pruning switches from beneficial to detrimental?

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Description

The abstract describes complement as both beneficial for developmental synaptic refinement and detrimental when excessive in adult pathology. The molecular switches or thresholds that determine this transition are not explained, yet understanding this is critical for therapeutic targeting.

Gap type: unexplained_observation Source paper: The Role of Complement in Synaptic Pruning and Neurodegeneration. (2021, ImmunoTargets and therapy, PMID:34595138)

Resolution criteria

Resolution requires: (1) Time-course experiments in developing vs adult mice (C1q, C3 knockout vs WT) measuring synaptic pruning at >=3 developmental stages, establishing the developmental window where complement activation transitions from beneficial to harmful; (2) Identification of specific molecular triggers (C1q opsonization patterns, C3 convertase activity thresholds, or synaptic tag modifications) that shift the balance, validated by antibody blockade or genetic dose-response in >=3 independent experiments; (3) Evidence that blocking the harmful transition preserves normal developmental pruning while preventing AD-associated synapse loss, with >=50% reduction in complement-dependent synapse loss in adult AD models. Pruning measurement without distinguishing beneficial from harmful contexts is insufficient.

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