C1q preferentially binds to specific neurexin (NRXN1α) and neuroligin (NLGN1) splice variants containing the SS2 site at synapses. During anesthesia, excitatory synapses containing NLGN1 (SS2+ insert) are opsonized, while inhibitory synapses containing NLGN2 (SS2- insert) are spared. This creates input-specific vulnerability in thalamocortical and Schaffer collateral pathways. The hypothesis has lowest mechanistic support and fewest falsifiable predictions.
Excitatory synapses on specific neuronal compartments (distal dendrites of CA1 pyramidal neurons) express low levels of membrane complement regulators CD46 and CD55, while inhibitory synapses and synapses on interneurons express high levels. During anesthesia, C1q binds preferentially to synapses lacking these regulators. Local C3a generation serves as a potent 'find-me' signal to recruiting microglia specifically to these unprotected synapses. Peptidomimetic enhancement of complement regulation
Verdict Summary
1/10
dimensions won
C1q Binding to Specific Synaptic Proteom
10/10
dimensions won
Differential Complement Regulator Expres
Radar Chart — 10 Dimensions
Score Comparison Bars
Mechanistic
0.60
0.75
Evidence
0.55
0.72
Novelty
0.68
0.75
Feasibility
0.48
0.70
Impact
0.50
0.80
Druggability
0.35
0.70
Safety
0.50
0.50
Competition
0.75
0.80
Data
0.50
0.55
Reproducible
0.58
0.72
Score Breakdown
Dimension
C1q Binding to Specific Synapt
Differential Complement Regula
Mechanistic
0.600
0.750
Evidence
0.550
0.720
Novelty
0.680
0.750
Feasibility
0.480
0.700
Impact
0.500
0.800
Druggability
0.350
0.700
Safety
0.500
0.500
Competition
0.750
0.800
Data
0.500
0.550
Reproducible
0.580
0.720
Evidence
C1q Binding to Specific Synaptic Proteomes via Neurexin/Neur
No evidence citations yet
Differential Complement Regulator Expression on Synaptic Mem
No evidence citations yet
Debate Excerpts
C1q Binding to Specific Synaptic Proteomes via Neu
4 rounds · quality: 0.75
Theorist
# Therapeutic Hypotheses: Selectivity of Complement-Mediated Synaptic Elimination During Prolonged Anesthesia
---
## Hypothesis 1: Activity-Dependent Synaptic Tagging via CREB-BDNF TrkB Signaling
*...
Skeptic
# Critical Evaluation of Hypotheses for Complement-Mediated Synaptic Selectivity
## Overview
These hypotheses address a legitimate gap in understanding how C1q distinguishes between synapses for eli...
Domain Expert
# Feasibility Assessment: Selectivity Mechanisms in Anesthesia-Induced Synaptic Elimination
## Executive Summary
The central question—whether specific synapses become targets for complement-mediated...
Synthesizer
{
"ranked_hypotheses": [
{
"title": "Differential Complement Regulator Expression on Synaptic Membranes (CD55/CD46)",
"description": "Excitatory synapses on specific neuronal compart...
Differential Complement Regulator Expression on Sy
4 rounds · quality: 0.75
Theorist
# Therapeutic Hypotheses: Selectivity of Complement-Mediated Synaptic Elimination During Prolonged Anesthesia
---
## Hypothesis 1: Activity-Dependent Synaptic Tagging via CREB-BDNF TrkB Signaling
*...
Skeptic
# Critical Evaluation of Hypotheses for Complement-Mediated Synaptic Selectivity
## Overview
These hypotheses address a legitimate gap in understanding how C1q distinguishes between synapses for eli...
Domain Expert
# Feasibility Assessment: Selectivity Mechanisms in Anesthesia-Induced Synaptic Elimination
## Executive Summary
The central question—whether specific synapses become targets for complement-mediated...
Synthesizer
{
"ranked_hypotheses": [
{
"title": "Differential Complement Regulator Expression on Synaptic Membranes (CD55/CD46)",
"description": "Excitatory synapses on specific neuronal compart...