AKAP13 is a scaffold protein that assembles signaling complexes downstream of G protein-coupled receptors (GPCRs). Its primary function is to activate RhoA through its guanine nucleotide exchange factor activity in response to GPCR signaling. AKAP13 also anchors protein kinase A (PKA) and organizes multi-kinase complexes that link adrenergic receptor activation to downstream signaling cascades, including p38 MAP kinase and NF-κB pathways. In cardiac physiology, AKAP13 mediates cardiomyocyte hypertrophy in response to β-adrenergic stimulation and pressure overload, and is required for normal sarcomere formation during embryonic heart development. Beyond the heart, AKAP13 enhances FSH-mediated CREB1 phosphorylation in granulosa cells during folliculogenesis 1, and recent evidence suggests AKAP13 couples GPCR signaling to mTORC1 inhibition, where PKA phosphorylates mTORC1's Raptor protein 2. In cancer contexts, AKAP13 expression correlates with mTORC1 activation and lung adenocarcinoma patient survival, and CD47-AKAP13 interaction promotes RhoA activation in T-cell lymphoma metastasis 3. AKAP13 amplification appears as a genomic marker in metastatic papillary thyroid carcinoma and is upregulated in invasive hepatocellular carcinoma. In a murine model, Akap13 haploinsufficiency produced sex-dependent increases in compulsive-like behavior and body weight in female mice 4. Genome-wide association analyses link AKAP13 expression to protective effects against female infertility risk 5, suggesting broad reproductive and metabolic roles.