PKD2L1 channels segregated to the apical compartment are the dual-mode pH sensor in cerebrospinal fluid-contacting neurons.

PKD2L1 channels in cerebrospinal fluid-contacting neurons act as dual-mode pH sensors, with high sensitivity around physiological pH levels.

• Why it matters: Understanding how CSFcNs detect and respond to CSF composition is crucial, as their unique anatomical organization suggests specialized sensory functions that are not yet fully understood.
• What they did: The study combined electrophysiology and optical methods to show that PKD2L1 channels are specifically localized in the apical process of CSFcNs and are highly sensitive to pH changes, modulating neuronal excitability.
• The result: This reveals that the spatial segregation and biophysical properties of PKD2L1 channels enable CSFcNs to serve as finely tuned pH sensors, supporting their role in monitoring CSF composition.