Astrocyte Developmental Timing in Neurodevelopmental Disorders: A Stage × Module Framework

Astrocytes play essential roles in neural circuit assembly, stabilization, and refinement, yet their contributions to neurodevelopmental disorders (NDDs) have largely been considered within static or disorder-specific frameworks. Converging evidence indicates that astrocytes acquire distinct functional capacities across development. Here, we organize these capacities into six functional modules—synaptogenic support, excitatory–inhibitory (E/I) homeostasis, metabolic coupling, neuromodulatory regulation, inflammatory threshold setting, and neurovascular stabilization—each representing a partially separable domain of astrocyte function with a distinct developmental trajectory. We integrate these modules across three major developmental windows—fetal, early postnatal, and adolescent—to propose a stage × module framework of astrocyte involvement in NDDs. A central premise of this framework is that neurodevelopmental vulnerability may arise not solely from astrocyte dysfunction per se, but from temporal mismatches between the maturation of astrocyte functional capacity and evolving circuit demand. During early postnatal development, the convergence of synaptogenic signaling and glutamate transporter maturation defines a vulnerability window in which perturbations may preferentially destabilize circuit assembly and contribute to social, sensory, and hyperexcitability phenotypes. During adolescence, continued astrocyte remodeling, particularly in association cortices, intersects with increasing neuromodulatory and metabolic demands and may influence attentional and executive stability. Different forms of temporal mismatch—including delayed maturation, premature stabilization, and excessive gain amplification—may therefore generate distinct phenotype clusters even when the underlying molecular perturbations overlap. We further conceptualize sex as a developmental modifier that can shift the timing, amplitude, or sensitivity of astrocyte module trajectories through hormonal, chromosomal, and immune-mediated mechanisms. This dynamic perspective accommodates heterogeneity across diagnostic categories while preserving mechanistic coherence and generates testable predictions regarding stage-specific molecular signatures, phenotypic consequences, and therapeutic responses. By reframing NDDs as stage-dependent disruptions of astrocyte functional modules and their alignment with circuit demand, the proposed framework suggests that therapeutic strategies should incorporate developmental timing alongside molecular specificity, providing a conceptual basis for stage-informed intervention and developmental neuroglial precision medicine.