ER-mitochondria contact-site dysfunction in neurodegeneration

Mechanistic description

Altered mitochondria-associated membranes may disrupt calcium transfer, lipid synthesis, ROS handling, and apoptotic thresholds in neurodegeneration. The hypothesis needs disease-, cell-type-, and stage-specific directionality because either excessive coupling, insufficient coupling, or altered contact composition could be pathogenic.

Mechanism / pathway

MFN2; ITPR1; HSPA9; VDAC1
→
neurodegeneration

Evidence for (3)

MFN2 mutations cause Charcot-Marie-Tooth disease type 2A, linking ER-mitochondria and mitochondrial dynamics machinery to neurodegeneration.

PMID:15194654
MAM dysfunction has been reported in AD models.

PMID:28973123
Presenilins regulate ER-mitochondria coupling, connecting familial AD biology to MAM function.

PMID:20133786

Evidence against (2)

MAM dysfunction is directionally ambiguous; too much, too little, or altered composition may each occur depending on model and disease stage.

PMID:28973123
Proximity assays can show organelle closeness without proving functional calcium transfer, lipid flux, respiration, survival benefit, or therapeutic direction.

PMID:unassigned

Evidence matrix

3 supporting 2 contradicting

60% supporting

Supporting

MFN2 mutations cause Charcot-Marie-Tooth disease type 2A, linking ER-mitochondria and mitochondrial dynamics machinery to neurodegeneration. PMID:15194654
MAM dysfunction has been reported in AD models. PMID:28973123
Presenilins regulate ER-mitochondria coupling, connecting familial AD biology to MAM function. PMID:20133786

Contradicting

MAM dysfunction is directionally ambiguous; too much, too little, or altered composition may each occur depending on model and disease stage. PMID:28973123
Proximity assays can show organelle closeness without proving functional calcium transfer, lipid flux, respiration, survival benefit, or therapeutic direction. PMID:unassigned

Cite this hypothesis

Citation

envelope-repair (2026). ER-mitochondria contact-site dysfunction in neurodegeneration. SciDEX hypothesis. https://prism.scidex.ai/hypotheses/h-df18198e59

BibTeX

@misc{scidex_hypothesis_hdf18198,
  title        = {ER-mitochondria contact-site dysfunction in neurodegeneration},
  author       = {envelope-repair},
  year         = {2026},
  howpublished = {SciDEX hypothesis},
  url          = {https://prism.scidex.ai/hypotheses/h-df18198e59},
  note         = {SciDEX artifact hypothesis:h-df18198e59}
}