{"type": "root", "children": [{"type": "p", "children": [{"type": "t", "text": "\nVaccinia‐related kinase 1 (VRK1) is a novel, evolutionarily conserved serine/threonine kinase predominantly localized in the nucleus that plays a central role in regulating cell proliferation and mitotic progression. VRK1 phosphorylates key transcription factors––for example, it targets p53 on Thr18 to enhance its stability and activity, ATF2 on Thr73 and Ser62 to promote transcriptional activation, and c‐Jun on Ser63/Ser73 to facilitate its accumulation and function. In addition, VRK1 phosphorylates histone H3 (at Thr3 and Ser10), thereby contributing to mitotic chromatin condensation and proper nuclear envelope formation. Furthermore, by modulating CREB activity and inducing cyclin D1 expression, VRK1 helps drive cell cycle entry and progression. These functions, along with structural features such as an extended C‑terminal region critical for full catalytic activity, underscore VRK1’s fundamental role in cellular growth and division."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "1", "end_ref": "12"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nVRK1 also functions as an important mediator of chromatin dynamics and the DNA damage response. It phosphorylates histone H2AX in response to ionizing radiation, facilitating the formation of γH2AX foci that recruit DNA repair factors, and it phosphorylates NBS1 to enhance the stability of repair complexes. Through its action on substrates such as coilin and via dynamic interactions with proteins regulating nuclear architecture (for example, BAF), VRK1 contributes to nuclear envelope integrity and the proper disassembly and reassembly of nuclear components during mitosis. Moreover, VRK1 levels are controlled in part through an autoregulatory loop mediated by transcriptionally active p53 and downstream effectors (such as DRAM), and its kinase activity is further modulated by binding partners including Plk3 and the chromatin-associated macroH2A1.2, ensuring that chromatin modifications and cell cycle transitions occur in a controlled manner."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "13", "end_ref": "22"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nIn diverse human cancers, elevated VRK1 expression has been correlated with poor prognosis and resistance to DNA‐damaging therapies. Its ability to sustain proliferative signaling by controlling cell cycle regulators and transcription factors, as well as to protect chromatin integrity under stress, has been documented in breast, lung, hepatocellular, and esophageal carcinomas. In particular, studies have shown that high VRK1 levels in these tumors associate with enhanced survival signaling and diminished treatment responsiveness, thereby marking VRK1 as both a potential prognostic biomarker and a target for the development of novel anticancer drugs."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "23", "end_ref": "27"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nAdditional layers of regulation involve direct interactions with other proteins that modulate VRK1’s activity and subcellular localization. For instance, specific phosphorylation events and conformational states determine whether VRK1 resides predominantly in the nucleus, associates with chromatin, or localizes to the Golgi apparatus. Binding partners such as Ran, which preferentially interacts with its inactive GDP‐bound form, and the histone variant macroH2A1.2, which suppresses its kinase activity during interphase, further fine‐tune VRK1 function to coordinate cellular responses throughout the cell cycle."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "28", "end_ref": "30"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nBeyond its roles in proliferating somatic cells, VRK1 is critical for neuronal development. Loss‐of-function mutations in VRK1 have been implicated in rare neurodegenerative conditions such as spinal muscular atrophy with pontocerebellar hypoplasia, where deficient VRK1 activity impairs neuronal migration and the proliferation of neural stem cells––possibly through effects on downstream targets like the amyloid‐β precursor protein (APP)––highlighting its importance in proper neuronal development and maintenance."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "31"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nVRK1 has further been shown to influence viral replication. Functional complementation studies demonstrate that enzymatically active VRK1 can substitute for viral kinases (such as the vaccinia virus B1 kinase) required for viral DNA synthesis, while knockdown of VRK1 in hepatocellular systems diminishes replication of viral RNA, suggesting that its kinase activity is exploited by certain viruses for propagation."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "32"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nFinally, emerging evidence points to non‐canonical RNA species derived from the VRK1 locus. For example, a circular RNA (circVRK1) has been identified as a tumor‐suppressive molecule in esophageal squamous cell carcinoma, where it acts by sponging miR‑624‑3p to upregulate PTEN levels and attenuate oncogenic PI3K/AKT signaling. These findings suggest that, in addition to encoding a multifunctional kinase, the VRK1 gene may give rise to regulatory RNAs with distinct biological activities."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "33"}]}, {"type": "t", "text": "\n"}]}, {"type": "rg", "children": [{"type": "r", "ref": 1, "children": [{"type": "t", "text": "Kathleen A Boyle, Paula Traktman "}, {"type": "b", "children": [{"type": "t", "text": "Members of a novel family of mammalian protein kinases complement the DNA-negative phenotype of a vaccinia virus ts mutant defective in the B1 kinase."}]}, {"type": "t", "text": " "}, {"type": "i", "children": [{"type": "t", "text": "J Virol (2004)"}]}, {"type": "t", "text": " DOI: "}, {"type": "a", "children": [{"type": "t", "text": "10.1128/jvi.78.4.1992-2005.2004"}], "href": "https://doi.org/10.1128/jvi.78.4.1992-2005.2004"}, {"type": "t", "text": " PMID: "}, {"type": "a", "children": [{"type": "t", "text": "14747564"}], "href": "https://pubmed.ncbi.nlm.nih.gov/14747564"}]}, {"type": "r", "ref": 2, "children": [{"type": "t", "text": "Ana Sevilla, Claudio R Santos, Francisco M Vega, et al. 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