synthesize

```json
{
  "ranked_hypotheses": [
    {
      "rank": 1,
      "hypothesis_id": "H3",
      "title": "TREM2 R47H-Dependent C1q Receptor Switching",
      "composite_score": 0.58,
      "dimension_scores": {
        "mechanistic_plausibility": 0.65,
        "evidence_strength": 0.45,
        "novelty": 0.80,
        "feasibility": 0.55,
        "therapeutic_potential": 0.75,
        "druggability": 0.55,
        "safety_profile": 0.45,
        "competitive_landscape": 0.65,
        "data_availability": 0.50,
        "reproducibility": 0.50
      },
      "evidence_for": [
        {
          "claim": "TREM2 R47H variant is an established AD genetic risk factor",
          "pmid": "27520755"
        },
        {
          "claim": "TREM2 is expressed on microglia and modulates phagocytosis",
          "pmid": "26634888"
        },
        {
          "claim": "C1q enhances microglial phagocytosis through TREM2-dependent mechanisms",
          "pmid": "28743904"
        },
        {
          "claim": "TREM2 R47H impairs ligand binding including Aβ",
          "pmid": "29362223"
        },
        {
          "claim": "C1q-TREM2 interaction mediates beneficial clearance functions",
          "pmid": "30837879"
        }
      ],
      "evidence_against": [
        {
          "claim": "Hypothesis is incomplete/fragmentary in submission",
          "pmid": null
        },
        {
          "claim": "Mechanistic link between R47H and specific receptor switching to C3AR1 not formally established",
          "pmid": null
        },
        {
          "claim": "C3AR1 role in AD neuroinflammation remains context-dependent",
          "pmid": "29908820"
        }
      ],
      "key_uncertainty": "The hypothesis is truncated—mechanism for receptor switching to C3AR1 pro-inflammatory signaling requires elaboration. TREM2 ligands (including C1q) and downstream signaling cascades need clearer delineation.",
      "proposed_validation": "1) Confirm C1q-TREM2 crystal structure/affinity; 2) Test whether R47H specifically disrupts C1q (not other ligands) binding; 3) Single-cell RNA-seq of R47H vs WT microglia for C3AR1 expression; 4) Crossbreeding TREM2 R47H mice with C1q knockout to test synapse preservation"
    },
    {
      "rank": 2,
      "hypothesis_id": "H2",
      "title": "C1q-LAIR-1 Displacement Mechanism",
      "composite_score": 0.47,
      "dimension_scores": {
        "mechanistic_plausibility": 0.50,
        "evidence_strength": 0.40,
        "novelty": 0.75,
        "feasibility": 0.45,
        "therapeutic_potential": 0.60