Oligodendrocyte mechanosensitivity: translates geometric cues into myelin patterns?

How oligodendrocytes (OLs) perceive the geometric features of axons and convert them into precise myelin structures remains unclear. The study by Dereddi et al. showed that the ion channel transmembrane protein 63A (TMEM63A) mediates the conversion of membrane tension at the contact site through activating intracellular Ca²⁺ signaling. This work demonstrates that TMEM63A is crucial for tuning myelin geometry, including thickness, length, and compatibility with axons. The deficiency of TMEM63A aligns with the clinical phenotype of human hypomyelinating leukodystrophy-19 (HLD19) syndrome. These findings provide new potential therapeutic targets for the intervention of diseases related to hypomyelinating disorders.