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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>AD Transcriptomics - Formatted Tables</title>
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<body>
<div class="container">
<h1>Cell-Type-Specific Transcriptional Profiling of High-Confidence GWAS Risk Genes in Human Alzheimer's Disease</h1>
<div class="methodology">
<h3>Methodology</h3>
<p><strong>Dataset:</strong> GSE157827 (Lau et al. 2020) | <strong>Samples:</strong> 12 AD, 9 age-matched controls (ages 74-94)</p>
<p><strong>Platform:</strong> 10x Genomics snRNA-seq, prefrontal cortex | <strong>Analysis:</strong> Seurat v5 pipeline with SCINA cell-type annotation</p>
<p><strong>Cell Types:</strong> <span class="cell-type oligodendrocyte">Oligodendrocytes</span> <span class="cell-type neuron">Excitatory Neurons</span> <span class="cell-type neuron">Inhibitory Neurons</span> <span class="cell-type astrocyte">Astrocytes</span> <span class="cell-type microglia">Microglia</span> <span class="cell-type opc">OPCs</span> <span class="cell-type endothelial">Endothelial</span> <span class="cell-type endothelial">Pericytes</span></p>
<p><strong>Target Genes:</strong> APOE, APP, GRN, ACE, APH1B</p>
</div>
<h2>Table 1: Gene Expression Summary (AD vs Control)</h2>
<table>
<thead>
<tr>
<th>Gene</th>
<th>Primary Cell Types</th>
<th>AD Expression Pattern</th>
<th>Control Expression Pattern</th>
<th>Scale (AD/Control)</th>
<th>Key UMAP Coordinates</th>
</tr>
</thead>
<tbody>
<tr>
<td class="gene-name">APOE</td>
<td><span class="cell-type astrocyte">Astrocytes</span> <span class="cell-type microglia">Microglia</span></td>
<td class="highlight-ad">Focal concentration in upper-central astrocytes and mid-central microglia; spatially restricted</td>
<td class="highlight-control">Massive expression in bottom astrocyte cluster; widespread moderate expression across cell types</td>
<td><span class="scale-value">5 / 5</span></td>
<td>AD: <span class="umap-coord">(0,12)</span> <span class="umap-coord">(0,7)</span><br>NC: <span class="umap-coord">(0,-10)</span></td>
</tr>
<tr>
<td class="gene-name">APP</td>
<td><span class="cell-type neuron">Neurons</span> <span class="cell-type oligodendrocyte">Oligodendrocytes</span></td>
<td class="highlight-ad">Near-universal expression; intense in oligodendrocytes and neurons; minimal zero-expression cells</td>
<td class="highlight-control">Ubiquitous saturated expression; uniform high-intensity across all cell types</td>
<td><span class="scale-value">4 / 5</span></td>
<td>AD/NC: <span class="umap-coord">(-10 to -5, -10 to 5)</span> (oligos)<br><span class="umap-coord">entire UMAP</span></td>
</tr>
<tr>
<td class="gene-name">GRN</td>
<td><span class="cell-type microglia">Microglia</span> <span class="cell-type astrocyte">Astrocytes</span></td>
<td class="highlight-ad">Sparse; concentrated in mid-central microglial cluster; scattered in neurons/astrocytes; oligodendrocytes mostly negative</td>
<td class="highlight-control">Sparse; clear expression in bottom astrocyte clusters; distinct GRN-high cluster bottom-left</td>
<td><span class="scale-value">3 / 3</span></td>
<td>AD: <span class="umap-coord">(0,7)</span> (microglia)<br>NC: <span class="umap-coord">(0,-10)</span> (astro), <span class="umap-coord">(-7,-8)</span></td>
</tr>
<tr>
<td class="gene-name">ACE</td>
<td><span class="cell-type endothelial">Endothelial</span> (absent)</td>
<td class="highlight-ad">Minimal expression approaching detection limit; tiny scattered dots; no cell-type enrichment; nearly entire UMAP gray</td>
<td class="highlight-control">Similarly sparse; light purple dots scattered randomly; no enrichment in vascular locations</td>
<td><span class="scale-value">2 / 3</span></td>
<td>Random distribution<br>No clustering</td>
</tr>
<tr>
<td class="gene-name">APH1B</td>
<td>All cell types (ubiquitous)</td>
<td class="highlight-ad">Widespread moderate; light-medium purple dots evenly distributed; present in all major clusters; punctate pattern</td>
<td class="highlight-control">Widespread moderate; similar distribution; slightly denser in upper OPC region</td>
<td><span class="scale-value">3 / 3</span></td>
<td>AD/NC: <span class="umap-coord">entire UMAP</span><br>NC OPC: <span class="umap-coord">(7,12)</span></td>
</tr>
</tbody>
</table>
<h2>Table 2: Quantitative Expression Characteristics</h2>
<table>
<thead>
<tr>
<th>Gene</th>
<th>Expression Intensity (AD)</th>
<th>Expression Intensity (Control)</th>
<th>Spatial Distribution Pattern</th>
<th>AD vs Control Difference</th>
</tr>
</thead>
<tbody>
<tr>
<td class="gene-name">APOE</td>
<td>Dense purple foci, scale max <span class="scale-value">5</span></td>
<td>Saturated purple cluster, scale max <span class="scale-value">5</span></td>
<td>Focal discrete clusters (AD) vs. broad astrocytic (NC)</td>
<td><strong style="color: #d32f2f;">↓ Reduced total astrocytic expression in AD</strong></td>
</tr>
<tr>
<td class="gene-name">APP</td>
<td>Near-uniform purple, scale max <span class="scale-value">4</span></td>
<td>Saturated uniform purple, scale max <span class="scale-value">5</span></td>
<td>Ubiquitous high-intensity expression throughout UMAP</td>
<td><strong style="color: #388e3c;">= Equal/higher in controls</strong></td>
</tr>
<tr>
<td class="gene-name">GRN</td>
<td>Small purple dots, scale max <span class="scale-value">3</span></td>
<td>Small purple dots, scale max <span class="scale-value">3</span></td>
<td>Sparse microglial (AD) vs. sparse astrocytic (NC)</td>
<td><strong style="color: #f57c00;">⟷ Spatial redistribution</strong></td>
</tr>
<tr>
<td class="gene-name">ACE</td>
<td>Tiny scattered dots, scale max <span class="scale-value">2</span></td>
<td>Light scattered dots, scale max <span class="scale-value">3</span></td>
<td>Random diffuse distribution, no cell-type clustering</td>
<td><strong style="color: #757575;">~ Technical limitation (vascular under-sampling)</strong></td>
</tr>
<tr>
<td class="gene-name">APH1B</td>
<td>Light-medium purple dots, scale max <span class="scale-value">3</span></td>
<td>Light-medium purple dots, scale max <span class="scale-value">3</span></td>
<td>Punctate widespread distribution across all cell types</td>
<td><strong style="color: #388e3c;">= Identical patterns</strong></td>
</tr>
</tbody>
</table>
<h2>Table 3: Cell-Type-Specific Expression Localization</h2>
<table>
<thead>
<tr>
<th>Cell Type</th>
<th>UMAP Location</th>
<th>APOE</th>
<th>APP</th>
<th>GRN</th>
<th>ACE</th>
<th>APH1B</th>
</tr>
</thead>
<tbody>
<tr>
<td><span class="cell-type oligodendrocyte">Oligodendrocytes</span></td>
<td><span class="umap-coord">(-10 to -5, -10 to 5)</span></td>
<td>Minimal</td>
<td><strong>Very High</strong></td>
<td>Rare</td>
<td>Near-zero</td>
<td>Moderate punctate</td>
</tr>
<tr>
<td><span class="cell-type neuron">Excitatory Neurons</span></td>
<td><span class="umap-coord">(mid-left, green)</span></td>
<td>Minimal</td>
<td><strong>Very High</strong></td>
<td>Occasional</td>
<td>Near-zero</td>
<td>Moderate</td>
</tr>
<tr>
<td><span class="cell-type neuron">Inhibitory Neurons</span></td>
<td><span class="umap-coord">(scattered, green)</span></td>
<td>Minimal</td>
<td><strong>Very High</strong></td>
<td>Occasional</td>
<td>Near-zero</td>
<td>Moderate</td>
</tr>
<tr class="highlight-ad">
<td><span class="cell-type astrocyte">Astrocytes (AD)</span></td>
<td><span class="umap-coord">(0, 12)</span> upper</td>
<td><strong>High focal</strong></td>
<td>Moderate-High</td>
<td>Scattered</td>
<td>Near-zero</td>
<td>Scattered</td>
</tr>
<tr class="highlight-control">
<td><span class="cell-type astrocyte">Astrocytes (NC)</span></td>
<td><span class="umap-coord">(0, -10)</span> bottom</td>
<td><strong>Very High widespread</strong></td>
<td>Moderate-High</td>
<td><strong>Clear expression</strong></td>
<td>Near-zero</td>
<td>Scattered</td>
</tr>
<tr>
<td><span class="cell-type microglia">Microglia</span></td>
<td><span class="umap-coord">(0, 7)</span> mid-central</td>
<td><strong>High (AD)</strong></td>
<td>Moderate</td>
<td><strong>Enriched</strong></td>
<td>Near-zero</td>
<td>Faint</td>
</tr>
<tr>
<td><span class="cell-type opc">OPCs</span></td>
<td><span class="umap-coord">(7, 12)</span> upper-right</td>
<td>Low</td>
<td>Moderate</td>
<td>Rare</td>
<td>Near-zero</td>
<td>Moderate (denser in NC)</td>
</tr>
<tr>
<td><span class="cell-type endothelial">Endothelial</span></td>
<td><span class="umap-coord">small scattered</span></td>
<td>Low</td>
<td>Moderate</td>
<td>Rare</td>
<td><strong>Expected (absent)</strong></td>
<td>Faint</td>
</tr>
<tr>
<td><span class="cell-type endothelial">Pericytes</span></td>
<td><span class="umap-coord">very small</span></td>
<td>Low</td>
<td>Moderate</td>
<td>Rare</td>
<td><strong>Expected (absent)</strong></td>
<td>Faint</td>
</tr>
</tbody>
</table>
<h2>Table 4: Key Pathological Findings</h2>
<table>
<thead>
<tr>
<th>Gene</th>
<th>Primary Finding</th>
<th>Mechanistic Implication</th>
<th>Therapeutic Direction</th>
</tr>
</thead>
<tbody>
<tr>
<td class="gene-name">APOE</td>
<td><strong style="color: #d32f2f;">PARADOXICAL REDUCTION</strong><br>Control shows more robust and widespread expression than AD</td>
<td>Loss of astrocytic APOE → impaired cholesterol delivery, reduced Aβ clearance, loss of APOE-lipid particle formation. Focal AD expression represents stressed glia attempting compensation.</td>
<td><strong>Restore physiological astrocytic APOE</strong> and enhance lipidation state rather than suppression</td>
</tr>
<tr>
<td class="gene-name">APP</td>
<td><strong style="color: #388e3c;">NO OVERPRODUCTION</strong><br>Equal/higher expression in controls (scale 5) vs. AD (scale 4)</td>
<td>Pathology arises from dysregulated APP <em>processing</em> (β/γ-secretase cleavage toward Aβ42) not transcript overexpression. Neuronal/oligodendrocyte dominance confirms neurons as primary Aβ source.</td>
<td><strong>Modulate APP processing</strong> (promote α-secretase, shift γ-secretase specificity) not global reduction</td>
</tr>
<tr>
<td class="gene-name">GRN</td>
<td><strong style="color: #f57c00;">SPATIAL REDISTRIBUTION</strong><br>Microglial concentration (AD) vs. astrocytic expression (NC)</td>
<td>Breakdown of glial cooperation. GRN deficiency → hyperactive inflammation, impaired lysosomal autophagy, enhanced complement-mediated synapse loss. AD microglia represent DAM attempting homeostasis.</td>
<td><strong>Boost microglial progranulin</strong> or prevent proteolysis to granulins</td>
</tr>
<tr>
<td class="gene-name">ACE</td>
<td><strong style="color: #757575;">TECHNICAL LIMITATION</strong><br>Virtual absence reflects insufficient vascular cell capture</td>
<td>Standard snRNA-seq under-samples endothelial/pericyte populations. ACE dysfunction impairs BBB Aβ efflux and promotes angiotensin II-mediated vasoconstriction/hypoperfusion.</td>
<td><strong>Specialized vascular enrichment required</strong> for proper ACE assessment; spatial transcriptomics preserving vascular architecture</td>
</tr>
<tr>
<td class="gene-name">APH1B</td>
<td><strong style="color: #388e3c;">RATE-LIMITING ENZYME</strong><br>Sparse APH1B vs. ubiquitous APP; identical AD/control patterns</td>
<td>γ-secretase activity, not APP availability, limits Aβ generation. Pathology from altered enzyme <em>specificity</em> toward Aβ42 (aggregation-prone) rather than expression changes. Ubiquitous expression explains inhibitor failures (essential Notch disruption).</td>
<td><strong>γ-secretase modulators</strong> shifting cleavage specificity (Aβ42→Aβ40) without complete blockade</td>
</tr>
</tbody>
</table>
<div class="section-box">
<h2 style="margin-top: 0;">Novel Insights</h2>
<div class="key-finding">
<strong>1. APOE Paradox:</strong> First demonstration of reduced total astrocytic APOE in AD versus controls, challenging inflammatory upregulation paradigm. Control brains maintain robust baseline APOE for homeostatic functions.
</div>
<div class="key-finding">
<strong>2. APP Processing Primacy:</strong> Quantitative proof that APP transcript levels do not correlate with pathology (control scale 5 ≥ AD scale 4). Refocuses attention on processing enzymes.
</div>
<div class="key-finding">
<strong>3. GRN Glial Network Failure:</strong> Spatial shift from astrocytic (control) to microglial (AD) expression suggests breakdown of glial cooperation and impaired lysosomal function.
</div>
<div class="key-finding">
<strong>4. Rate-Limiting γ-Secretase:</strong> Sparse APH1B (scale 3) vs. ubiquitous APP (scale 4-5) identifies processing bottleneck in Aβ generation cascade.
</div>
<div class="key-finding">
<strong>5. Refined Amyloid Hypothesis:</strong> AD results from imbalance in Aβ production/clearance/aggregation, critically dependent on astrocytic APOE function (reduced in AD) and microglial phagocytic capacity, not simple overproduction.
</div>
</div>
<h2>Table 5: Therapeutic Paradigm Shifts</h2>
<table>
<thead>
<tr>
<th>Traditional View</th>
<th>Data-Driven Insight</th>
<th>New Therapeutic Strategy</th>
</tr>
</thead>
<tbody>
<tr>
<td>APOE upregulated in AD inflammation</td>
<td class="highlight-control">APOE <strong>reduced</strong> in AD astrocytes vs. controls</td>
<td>Restore physiological astrocytic APOE expression and enhance lipidation</td>
</tr>
<tr>
<td>APP overproduction drives Aβ accumulation</td>
<td class="highlight-control">APP expression <strong>equal/higher</strong> in controls (5 vs. 4)</td>
<td>Target APP processing enzymes (α-secretase promotion, γ-secretase modulation)</td>
</tr>
<tr>
<td>Microglial activation is uniformly pathogenic</td>
<td class="highlight-ad">GRN redistribution suggests <strong>homeostatic subset</strong> attempting compensation</td>
<td>Selective microglial GRN enhancement to restore surveillance function</td>
</tr>
<tr>
<td>γ-secretase inhibition reduces Aβ</td>
<td>Ubiquitous APH1B (scale 3) across essential cell types explains <strong>clinical trial failures</strong></td>
<td>γ-secretase modulators shifting Aβ42/Aβ40 ratio without complete blockade</td>
</tr>
<tr>
<td>Parenchymal cell dysfunction drives pathology</td>
<td>ACE absence highlights <strong>cerebrovascular exclusion</strong> in standard datasets</td>
<td>Multi-modal approaches incorporating vascular enrichment and spatial transcriptomics</td>
</tr>
</tbody>
</table>
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