Research has revealed that the GPX4 enzyme has a structural property that protects neurons from damage to their cell membranes. A rare mutation of this enzyme removes this protection, allowing harmful molecules to damage cells and trigger early-onset dementia. Experiments on mice and cell cultures have shown changes similar to Alzheimer's disease. These findings suggest that damage caused by GPX4 mutation may be an important trigger of neurodegenerative processes leading to dementia. Early tests aimed at slowing this damage bring new opportunities for research and potential treatment of dementia. This discovery highlights the importance of enzymes in maintaining the health of brain cells and opens new directions for understanding the mechanisms of neurodegeneration.