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Alzheimer's Disease as the Result of Aberrant Reactivation of Embryonic Brain Pathways Silenced Decades Earlier
Lehrer S.. Research Square, 2026-07-22
Topic: Genetics and APOE
Background A fundamental mystery in Alzheimer's disease (AD) is why established adult axonal networks undergo progressive "dying-back" axopathy. During embryogenesis, axon growth is governed by a volatile molecular oscillator balancing outward-pushing Arp2/3 branched actin waves and inward contractile non-muscle actomyosin forces. We hypothesize that chronic aging stress causes epigenetic derepression, aberrantly reactivating this silenced embryonic machinery in mature neurons and glia to trigger mechanical instability, microtubule buckling, and synaptic retraction. Methods We integrated systemic Phenome-wide Association Study (PheWeb) metrics with layer-stratified single-nucleus transcriptomic data from multi-ethnic prefrontal cortex cohort (The Mount Sinai Brain Bank MSBB Cohort MSBB-AD) mapping a strict 10-gene pathway matrix, alongside upstream driver SOX9 and engulfment receptor MEGF10. Results PheWeb screens linked core pathway genes to mechanical shear-stress phenotypes. Cortical layer stratification revealed coordinated astrocytic tension scaling tracking Tau tangle severity: mid-cortical Layer 4 Non-Muscle Myosin IIb (MYH10) scaled positively (beta = + 0.3413, p = 0.0284) while Layer 3 ARPC2 was suppressed (beta = -0.3459, p = 0.0570). Concurrently, MEGF10 exhibited spatial migration across disease stages, correlating heavily with cognitive decline in deep output Layer 5 (beta = -0.0355, p = 0.0023). Conclusions These findings shift AD modeling from passive proteotoxicity to an active, misregulated developmental structural engine, offering a mechanical framework that explains early olfactory vulnerability and non-linear anti-tau clinical trial responses.
Key findings
- Results PheWeb screens linked core pathway genes to mechanical shear-stress phenotypes.
- Cortical layer stratification revealed coordinated astrocytic tension scaling tracking Tau tangle severity: mid-cortical Layer 4 Non-Muscle Myosin IIb (MYH10) scaled positively (beta = + 0.3413, p = 0.0284) while Layer 3 ARPC2 was suppressed (beta = -0.3459, p = 0.0570).
- Conclusions These findings shift AD modeling from passive proteotoxicity to an active, misregulated developmental structural engine, offering a mechanical framework that explains early olfactory vulnerability and non-linear anti-tau clinical trial responses.
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Study details
- Evidence strengthModerate
How this study scored 16/100
Preprint — not yet peer-reviewed. It scored 24 on the same rubric, but non-peer-reviewed sources are capped at 16, so it shows as 16. Scored zero for study design, sample size, effect reported, studied in people and randomised / blinded because the record does not state it. We have no data on times cited, citations per year, impact for its field and year, cited by studies here, still being cited, senior author's track record, institution's track record and multi-centre collaboration, so those were left out: it earned 15 of the 62 points we could judge it on, which is 24 out of 100.
| Component | Points | Why |
|---|---|---|
| Journal tier | 2 / 10 | Tier 4 — not a peer-reviewed journal (Research Square) |
| Journal's citation record | 0 / 4 | Not a journal article, so the journal's record does not count |
| Study design | 0 / 12 | No study design recorded — scores zero, not guessed (not stated in the record — scored 0) |
| Strength of evidence | 3 / 5 | Rated “moderate” in our summary |
| Peer-review validation | 4 / 10 | Preprint — not yet peer-reviewed. Hosted on a preprint server. |
| How recent | 5 / 5 | 2026 — within 1 year(s) of the newest study here |
| Sample size | 0 / 4 | Participant count not stated — scores zero (not stated in the record — scored 0) |
| Effect reported | 0 / 3 | No effect size reported — scores zero (not stated in the record — scored 0) |
| Studied in people | 0 / 3 | Not stated whether this was studied in people — scores zero (not stated in the record — scored 0) |
| Randomised / blinded | 0 / 2 | No randomisation or blinding stated — scores zero (not stated in the record — scored 0) |
| Times cited | — / 7 | No citation count (not found in OpenAlex) — left out of this score |
| Citations per year | — / 5 | No citation count or no year — left out of this score |
| Impact for its field and year | — / 6 | No field-weighted citation impact (OpenAlex has none yet) — left out of this score |
| Cited by studies here | — / 6 | Not yet checked against this library's citation graph — left out of this score |
| Still being cited | — / 4 | No yearly citation counts — left out of this score |
| Senior author's track record | — / 4 | Senior author's record not available — left out of this score |
| Institution's track record | — / 3 | No institution listed in OpenAlex — left out of this score |
| Multi-centre collaboration | — / 3 | Institutions not listed — left out of this score |
| Indexed in PubMed | 1 / 2 | Not in PubMed, but has a DOI |
| Free to read | 0 / 2 | Behind a paywall — scores zero |
| Points | 15 / 62 | Scored on 12 of 20 parts. We have no data for the rest, so they are left out: 15 of the 62 points we could judge it on is 24 out of 100. |
| Total | 24 / 100 | Capped to 16 because this is not a peer-reviewed article. |
What each of these 20 components measures, and what this score is not →
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Cite this study APA, Vancouver, BibTeX · download .bib or .ris
Built from the record alzhub holds for this paper, not looked up. Volume, issue and page numbers are not held in the record. Check the citation against the original before you use it.
APA 7th
Lehrer, S. (2026). Alzheimer's Disease as the Result of Aberrant Reactivation of Embryonic Brain Pathways Silenced Decades Earlier. Research Square. https://doi.org/10.21203/rs.3.rs-10436661/v1
Vancouver
Lehrer S. Alzheimer's Disease as the Result of Aberrant Reactivation of Embryonic Brain Pathways Silenced Decades Earlier. Research Square. 2026. doi:10.21203/rs.3.rs-10436661/v1.
BibTeX
@article{lehrer2026-830ed5a8,
author = {Lehrer, S.},
title = {{Alzheimer's Disease as the Result of Aberrant Reactivation of Embryonic Brain Pathways Silenced Decades Earlier}},
journal = {Research Square},
year = {2026},
doi = {10.21203/rs.3.rs-10436661/v1},
url = {https://doi.org/10.21203/rs.3.rs-10436661/v1}
}
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