{"type": "root", "children": [{"type": "p", "children": [{"type": "t", "text": "\nThe PALM2‐AKAP2 gene locus encodes a multifunctional protein that serves as an A‐kinase anchoring protein, critical for localizing protein kinase A (PKA) and thereby modulating its downstream signaling. An amino acid substitution in d‐AKAP2 has been shown to alter its binding affinity for the PKA‐RIα isoform, leading to changes in its subcellular distribution and affecting cardiac conduction parameters in healthy aging individuals."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "1"}]}, {"type": "t", "text": " Moreover, disruption of AKAP2 has been implicated in developmental disorders – for example, a de novo translocation interrupting this gene is linked to a complex phenotype including Kallmann syndrome and bone anomalies, with expression observed in the olfactory bulb and embryonic cartilage."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "2"}]}, {"type": "t", "text": " Genome‐wide association studies have further implicated the PALM2‐AKAP2 region in complex traits such as human height, underscoring a role in growth and developmental regulation."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "3"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nAberrant regulation of AKAP2 has also been linked to disease processes affecting both the musculoskeletal system and cancer. In prostate cancer cells, for example, AKAP2 modulates PKA signaling such that its altered subcellular distribution enhances cellular invasion and tumorigenicity."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "4"}]}, {"type": "t", "text": " Familial forms of adolescent idiopathic scoliosis have been associated with mutations in AKAP2"}, {"type": "fg", "children": [{"type": "fg_f", "ref": "5"}]}, {"type": "t", "text": ", and studies in Chinese populations further support a link between AKAP2 genetic variants and spinal deformities."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "6"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nIn addition, emerging evidence from cancer research highlights an oncogenic role for AKAP2 and its partner PALM2. Overexpression of AKAP2 in ovarian cancer promotes cell proliferation and migration by activating β‐catenin/TCF signaling pathways."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "7"}]}, {"type": "t", "text": " Separately, the prenylated protein PALM2 enhances cell migration in esophageal carcinoma through a specific interaction with ezrin that is dependent on key residues within both proteins."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "8"}]}, {"type": "t", "text": " Furthermore, in cardiac myofibroblasts, AKAP2 functions as an F‐actin–bound scaffold that assembles an ERK1 signaling complex, driving cytoskeletal remodeling and cell migration that may contribute to cardiac fibrosis."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "9"}]}, {"type": "t", "text": "\n"}]}, {"type": "rg", "children": [{"type": "r", "ref": 1, "children": [{"type": "t", "text": "Stefan Kammerer, Lora L Burns-Hamuro, Yuliang Ma, et al. 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