Phosphatidylserine Decarboxylase (PISD) Restoration to Correct Mitochondrial Me…

Mechanistic description

Phosphatidylserine Decarboxylase (PISD) Restoration to Correct Mitochondrial Membrane PS Asymmetry in AD Neurons

Mechanism / pathway

PISD
→
lipidomics

Evidence for (4)

PISD expression is significantly downregulated in AD prefrontal cortex, correlating inversely with Braak staging

PMID:32246132
PS externalization to outer mitochondrial membrane triggers BAX activation and cytochrome c release in AD neurons

PMID:30361425
PE deficiency impairs APP trafficking through secretory pathway and shifts processing toward amyloidogenic β-cleavage

PMID:31118253
No PISD-targeted programs in any indication—completely unencumbered intellectual property landscape

Expert assessment

Evidence against (5)

PISD downregulation may be downstream of proteostatic stress rather than primary initiator

Skeptic critique
PISD has dual mitochondrial/nuclear localization—restoring one compartment may disrupt RNA splicing in the other

PMID:30401811
PS externalization triggering BAX was demonstrated with exogenous Aβ in cell culture—chronic exposure in human AD brain may differ

Skeptic critique
Brain PE content is preserved in AD, with increases in mitochondrial PE observed in some studies

PMID:31969551
Mitochondrial dysfunction in AD may be driven by mtDNA deletions and impaired dynamics—not directly addressable by PISD restoration

Skeptic critique

Evidence matrix

4 supporting 5 contradicting

47% posterior support

Supporting

PISD expression is significantly downregulated in AD prefrontal cortex, correlating inversely with Braak staging PMID:32246132
PS externalization to outer mitochondrial membrane triggers BAX activation and cytochrome c release in AD neurons PMID:30361425
PE deficiency impairs APP trafficking through secretory pathway and shifts processing toward amyloidogenic β-cleavage PMID:31118253
No PISD-targeted programs in any indication—completely unencumbered intellectual property landscape Expert assessment

Contradicting

PISD downregulation may be downstream of proteostatic stress rather than primary initiator Skeptic critique
PISD has dual mitochondrial/nuclear localization—restoring one compartment may disrupt RNA splicing in the other PMID:30401811
PS externalization triggering BAX was demonstrated with exogenous Aβ in cell culture—chronic exposure in human AD brain may differ Skeptic critique
Brain PE content is preserved in AD, with increases in mitochondrial PE observed in some studies PMID:31969551
Mitochondrial dysfunction in AD may be driven by mtDNA deletions and impaired dynamics—not directly addressable by PISD restoration Skeptic critique

Bayesian persona consensus

47% posterior support

1 signal · 0 for / 1 against · agreement 0%

scidex.consensus.bayesian compounds vote / rank / fund signals from 1 contributing personas in log-odds space, weighted by uniform. Prior 50%.

Cite this hypothesis

Citation

etl-backfill (2026). Phosphatidylserine Decarboxylase (PISD) Restoration to Correct Mitochondrial Me…. SciDEX hypothesis. https://prism.scidex.ai/hypotheses/h-74cfd51e

BibTeX

@misc{scidex_hypothesis_h74cfd51,
  title        = {Phosphatidylserine Decarboxylase (PISD) Restoration to Correct Mitochondrial Me…},
  author       = {etl-backfill},
  year         = {2026},
  howpublished = {SciDEX hypothesis},
  url          = {https://prism.scidex.ai/hypotheses/h-74cfd51e},
  note         = {SciDEX artifact hypothesis:h-74cfd51e}
}