Ad Knowledge Gaps Ranked Prioritized Research Questions is an important component in the neurobiology of neurodegenerative diseases. This page provides detailed information about its structure, function, and role in disease processes.
Task: rs002 | Last Updated: 2026-03-05 | Total Gaps Identified: 20
This page identifies and scores the top 20 unanswered questions in Alzheimer's disease research. Each gap is scored on four dimensions to prioritize which questions most urgently need answering.
Each gap is scored 0-10 on four dimensions:
| Dimension | Description |
|---|---|
| Impact if Solved | Would solving this gap change how we treat or prevent AD? |
| Tractability | Is this answerable with current technology/methods? |
| Current Effort | Are too few people working on this? (10 = severely under-explored) |
| Data Availability | Do we have the datasets/biobanks/models to study this? |
Max score: 40
| Rank | Question | Impact | Tractability | Effort | Data | Total | Priority |
|---|---|---|---|---|---|---|---|
| 1 | Why does amyloid removal only slow decline 27%? | 10 | 8 | 6 | 9 | 33 | Critical |
| 2 | What triggers the switch from normal aging to AD? | 10 | 5 | 8 | 7 | 30 | Critical |
| 3 | Why do some amyloid-positive people never get dementia? | 10 | 6 | 7 | 8 | 31 | Critical |
| 4 | What causes selective vulnerability of specific brain regions? | 9 | 7 | 6 | 7 | 29 | High |
| 5 | Does tau spread cause neurodegeneration or is it a bystander? | 10 | 7 | 5 | 8 | 30 | Critical |
| 6 | What is the role of the immune system in early vs late AD? | 9 | 7 | 7 | 8 | 31 | Critical |
| 7 | Is AD one disease or several with shared symptoms? | 9 | 5 | 8 | 6 | 28 | High |
| 8 | What is the role of the microbiome-gut-brain axis in AD? | 8 | 7 | 7 | 7 | 29 | High |
| 9 | Why do women get AD 2x more than men? | 9 | 6 | 7 | 7 | 29 | High |
| 10 | What role do viral infections (HSV-1, HHV-6) play in AD? | 8 | 6 | 6 | 6 | 26 | High |
| 11 | What are the molecular mechanisms of resilience? | 9 | 5 | 8 | 6 | 28 | High |
| 12 | How does sleep disruption contribute to AD pathogenesis? | 8 | 8 | 5 | 7 | 28 | High |
| 13 | What is the relationship between vascular dysfunction and amyloid? | 8 | 7 | 5 | 8 | 28 | High |
| 14 | Can we develop reliable preclinical AD biomarkers? | 9 | 6 | 6 | 7 | 28 | High |
| 15 | What causes rapid vs slow progression in different patients? | 8 | 5 | 7 | 6 | 26 | Medium |
| 16 | Role of metal ion dysregulation in amyloid aggregation | 7 | 6 | 5 | 7 | 25 | Medium |
| 17 | How does ApoE4 confer risk at the cellular level? | 8 | 7 | 4 | 8 | 27 | Medium |
| 18 | What is the relationship between TBI and later AD? | 7 | 6 | 6 | 6 | 25 | Medium |
| 19 | Can lifestyle interventions modify disease trajectory? | 8 | 9 | 3 | 8 | 28 | High |
| 20 | What is optimal timing for therapeutic intervention? | 10 | 6 | 5 | 7 | 28 | Critical |
Impact (10/10): Understanding this would fundamentally change our therapeutic strategy.
Tractability (8/10): Requires sophisticated biomarker studies and mechanistic work.
Current Effort (6/10): Some work ongoing but underfunded relative to importance.
Data Availability (9/10): CLARITY-AD, TRAILBLAZER-ALZ2 datasets available.
Hypothesis: Amyloid removal is insufficient because:
Related Pages: Anti-amyloid antibodies, Tau Pathology, Synaptic Loss in AD
Impact (10/10): Primary prevention depends on understanding this trigger.
Tractability (5/10): Very difficult to identify a single trigger.
Current Effort (8/10): Major research focus but limited progress.
Data Availability (7/10): Need longitudinal cohort data.
Key hypotheses to test:
Related Pages: Amyloid Hypothesis, Risk Factors for AD, Preclinical AD
Impact (10/10): Could reveal protective mechanisms applicable to all patients.
Tractability (6/10): Requires large cohort studies of resilient individuals.
Current Effort (7/10): Emerging area (SuperAgers, resilience research).
Data Availability (8/10): Several cohorts tracking resilient individuals.
Known resilience factors:
Related Pages: Cognitive Reserve, ApoE and AD, Brain Reserve
Impact (10/10): Determines whether anti-tau therapies will be curative.
Tractability (7/10): Can be tested with tau PET and intervention studies.
Current Effort (5/10): Under-investigated relative to amyloid.
Data Availability (8/10): Tau PET data widely available.
Related Pages: Tau Propagation, Tau Antibodies, Neurodegeneration
Impact (9/10): Immune modulation is a promising therapeutic avenue.
Tractability (7/10): Single-cell technologies enable deep investigation.
Current Effort (7/10): Growing area with TREM2 research.
Data Availability (8/10): Multiple immune-profiling datasets available.
Key questions:
Related Pages: Microglia in AD, TREM2, Neuroinflammation
Impact (9/10): Sex-specific prevention and treatment strategies.
Tractability (6/10): Requires controlling for multiple variables.
Current Effort (7/10): Growing interest in sex differences.
Data Availability (7/10): Need sex-stratified cohort data.
Hypotheses:
Related Pages: Risk Factors for AD, Sex Differences in AD
Impact (8/10): Potential for microbiome-based interventions.
Tractability (7/10): Can be studied with current sequencing tech.
Current Effort (7/10): Rapidly growing field.
Data Availability (7/10): Multiple microbiome-AD studies published.
Related Pages: Gut-Brain Axis, Microbiome and Neurodegeneration
Impact (8/10): Could reveal prevention strategies (vaccination).
Tractability (6/10): Difficult to prove causation.
Current Effort (6/10): Controversial area with recent resurging interest.
Data Availability (6/10): Some cohort data available.
Viruses implicated:
Related Pages: Viral Hypotheses of AD, Infectious Disease and AD
Impact (9/10): Could inform brain training and prevention.
Tractability (5/10): Very complex to dissect molecularly.
Current Effort (8/10): Active research area.
Data Availability (6/10): Limited molecular data.
Related Pages: Cognitive Reserve, Brain Plasticity
Impact (8/10): Modifiable risk factor.
Tractability (8/10): Well-established models.
Current Effort (5/10): Under-investigated.
Data Availability (7/10): Sleep and biomarker studies available.
Mechanisms:
Related Pages: Sleep and AD, Glymphatic System
Bubble size represents total score. Numbers correspond to gap rank.
The study of Ad Knowledge Gaps Ranked Prioritized Research Questions has evolved significantly over the past decades. Research in this area has revealed important insights into the underlying mechanisms of neurodegeneration and continues to drive therapeutic development.
Historical context and key discoveries in this field have shaped our current understanding and will continue to guide future research directions.