CD51 delineates functionally distinct astrocyte subtypes in neural circuits.

CD51 marks astrocyte subtypes with distinct functions, promoting synapse formation and circuit plasticity in vivo.

• Why it matters: Understanding astrocyte heterogeneity is crucial because their diverse roles support brain physiology, yet whether molecular differences reflect specialized functions remains unclear.
• What they did: Using a CD51-FLP mouse line, the study compared CD51 + and CD51 - astrocytes in vivo, revealing their unique morphological, physiological, and developmental properties in cortex and hippocampus.
• The result: CD51 + astrocytes promote synapse formation and circuit plasticity, with implications for brain injury recovery, by functioning through glypican 6 and CD51 itself, respectively.