Vanishing White Matter Disease (VWMD)
https://onlinelibrary.wiley.com/doi/10.1002/ana.78083?af=R
Vanishing White Matter disease (VWMD) is a rare genetic condition that affects the brain’s white matter and is caused by mutations in the EIF2B genes. Individuals with VWMD present progressive white matter loss but can also experience acute episodes of worsening, often during fever or head trauma. Brain MRI scans show that not all brain regions are similarly affected: the brainstem shows signs of recovery while the frontal white matter chronically degenerates. To better understand this heterogeneity for repair, researchers examined brain tissue from nine people with VWMD and four controls. They compared the more resilient pons white matter (part of the brainstem) and the more affected frontal white matter. They closely looked at the main cells involved in maintaining and repairing white matter, which are astrocytes, oligodendrocytes and microglia. They found that in the severely affected frontal white matter, these cells showed signs of dysfunction, suggesting that they lacked the capacity to support repair. In contrast, the pons exhibited preserved support cells and active repair responses. In patients who recovered from an acute episode, the pons tissue looked nearly normal, similar to that of individuals without VWMD. These findings suggest that EIF2B defects affect support cells differently across brain regions, which may help explain the different responses to damage and the variability in the ability to recover.