Akt3

AKT serine/threonine kinase 3 (AKT3) is a PI3K-AKT pathway effector that regulates cellular growth, survival, and neurodevelopment, with particularly high expression in the central nervous system[1][2]. Mechanistically, AKT3 contributes to mTOR signaling and postnatal brain growth by controlling both cell size and cell number, and Akt3-deficient mice display selective reductions in brain volume without major disturbances in glucose homeostasis[1][3]. In disease models, somatic activating mutations and copy-number alterations of AKT3 are associated with megalencephaly-spectrum neurodevelopmental disorders and hemispheric brain overgrowth, supporting a central role for AKT3 during cortical development and neural progenitor regulation[4]. Compared with related isoforms, AKT1 primarily regulates organismal growth, whereas AKT2 is closely linked to insulin-responsive metabolic tissues; in contrast, AKT3 shows brain-enriched expression and mediates isoform-specific control of neural growth and signaling outputs[1][2][3]. Beyond developmental biology, genomically amplified AKT3 promotes glioma progression and activates DNA repair programs, identifying AKT3 as a functionally dominant AKT isoform in specific brain tumor contexts[5]. For experimental applications, recent medicinal chemistry efforts have produced isoform-selective AKT3 degraders that induce proteasomal degradation of AKT3 and suppress growth of resistant cancer models, providing tools for dissecting AKT3-specific signaling and therapeutic vulnerabilities[6].