{"type": "root", "children": [{"type": "p", "children": [{"type": "t", "text": "\nSPDYA (also known as Spy1 or Speedy A) is an atypical cyclin‐like regulator that promotes cell cycle progression by directly activating cyclin‐dependent kinase 2 (CDK2) outside the classical cyclin pathway. This activation bypasses the need for canonical regulatory events such as activation loop phosphorylation, leading to an expedited cell cycle even under conditions of DNA damage. In addition, SPDYA facilitates the phosphorylation and subsequent degradation of the CDK inhibitor p27 at Thr187 and is itself subject to tight proteolytic control, underscoring its role in overriding checkpoint responses and suppressing apoptosis. (<!-- Citation 1 -->"}, {"type": "fg", "children": [{"type": "fg_f", "ref": "1"}]}, {"type": "t", "text": ", <!-- Citation 2 -->"}, {"type": "fg", "children": [{"type": "fg_f", "ref": "2"}]}, {"type": "t", "text": ", <!-- Citation 3 -->"}, {"type": "fg", "children": [{"type": "fg_f", "ref": "3"}]}, {"type": "t", "text": ", <!-- Citation 4 -->"}, {"type": "fg", "children": [{"type": "fg_f", "ref": "4"}]}, {"type": "t", "text": ", <!-- Citation 5 -->"}, {"type": "fg", "children": [{"type": "fg_f", "ref": "5"}]}, {"type": "t", "text": ", <!-- Citation 14 -->."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "6"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nIn the context of cancer, SPDYA overexpression has been strongly linked to oncogenesis by enhancing cell proliferation, promoting survival and facilitating cell cycle checkpoint bypass. Aberrant SPDYA expression is observed in hepatocellular carcinoma, various gliomas, breast, ovarian, and hematologic malignancies, and its dysregulation correlates with poor prognosis and drug resistance. Through modulation of critical pathways—including ERK/MAPK and PI3K/AKT as well as mediating cell adhesion–related drug resistance—SPDYA has emerged as a key factor in tumor progression and in the development of therapeutic resistance. (<!-- Citation 6 -->"}, {"type": "fg", "children": [{"type": "fg_f", "ref": "7"}]}, {"type": "t", "text": ", <!-- Citation 7 -->"}, {"type": "fg", "children": [{"type": "fg_f", "ref": "8"}]}, {"type": "t", "text": ", <!-- Citation 8 -->"}, {"type": "fg", "children": [{"type": "fg_f", "ref": "9"}]}, {"type": "t", "text": ", <!-- Citation 9 -->"}, {"type": "fg", "children": [{"type": "fg_f", "ref": "10"}]}, {"type": "t", "text": ", <!-- Citation 11 -->"}, {"type": "fg", "children": [{"type": "fg_f", "ref": "11"}]}, {"type": "t", "text": ", <!-- Citation 12 -->"}, {"type": "fg", "children": [{"type": "fg_f", "ref": "12"}]}, {"type": "t", "text": ", <!-- Citation 13 -->"}, {"type": "fg", "children": [{"type": "fg_f", "ref": "13"}]}, {"type": "t", "text": ", <!-- Citation 15 -->."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "14"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nBeyond its canonical role in cell cycle regulation and oncogenesis, SPDYA has important functions in developmental and specialized cellular processes. A direct interaction between SPDYA and the nuclear envelope protein SUN1 is essential for establishing telomere architecture during meiotic prophase I, a prerequisite for proper homolog pairing and synapsis. In addition, SPDYA interacts with proteins such as CRMP1 to influence actin dynamics during neuronal growth cone collapse and nerve regeneration. In neuroblastoma cells, alterations in SPDYA levels impact both ERK/MAPK and PI3K/AKT signaling pathways—a finding further underscored by studies using iron chelating compounds that reduce SPDYA expression and enhance apoptotic markers. (<!-- Citation 10 -->"}, {"type": "fg", "children": [{"type": "fg_f", "ref": "15"}]}, {"type": "t", "text": ", <!-- Citation 16 -->"}, {"type": "fg", "children": [{"type": "fg_f", "ref": "16"}]}, {"type": "t", "text": ", <!-- Citation 17 -->"}, {"type": "fg", "children": [{"type": "fg_f", "ref": "17"}]}, {"type": "t", "text": ", <!-- Citation 18 -->."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "18"}]}, {"type": "t", "text": "\n"}]}, {"type": "rg", "children": [{"type": "r", "ref": 1, "children": [{"type": "t", "text": "Elizabeth A Barnes, Lisa A Porter, Jean-Luc Lenormand, et al. "}, {"type": "b", "children": [{"type": "t", "text": "Human Spy1 promotes survival of mammalian cells following DNA damage."}]}, {"type": "t", "text": " "}, {"type": "i", "children": [{"type": "t", "text": "Cancer Res (2003)"}]}, {"type": "t", "text": " PMID: "}, {"type": "a", "children": [{"type": "t", "text": "12839962"}], "href": "https://pubmed.ncbi.nlm.nih.gov/12839962"}]}, {"type": "r", "ref": 2, "children": [{"type": "t", "text": "Randy F Gastwirt, Daniela A Slavin, Christopher W McAndrew, et al. "}, {"type": "b", "children": [{"type": "t", "text": "Spy1 expression prevents normal cellular responses to DNA damage: inhibition of apoptosis and checkpoint activation."}]}, {"type": "t", "text": " "}, {"type": "i", "children": [{"type": "t", "text": "J Biol Chem (2006)"}]}, {"type": "t", "text": " DOI: "}, {"type": "a", "children": [{"type": "t", "text": "10.1074/jbc.M604720200"}], "href": "https://doi.org/10.1074/jbc.M604720200"}, {"type": "t", "text": " PMID: "}, {"type": "a", "children": [{"type": "t", "text": "16951407"}], "href": "https://pubmed.ncbi.nlm.nih.gov/16951407"}]}, {"type": "r", "ref": 3, "children": [{"type": "t", "text": "Christopher W McAndrew, Randy F Gastwirt, April N Meyer, et al. "}, {"type": "b", "children": [{"type": "t", "text": "Spy1 enhances phosphorylation and degradation of the cell cycle inhibitor p27."}]}, {"type": "t", "text": " "}, {"type": "i", "children": [{"type": "t", "text": "Cell Cycle (2007)"}]}, {"type": "t", "text": " DOI: "}, {"type": "a", "children": [{"type": "t", "text": "10.4161/cc.6.15.4520"}], "href": "https://doi.org/10.4161/cc.6.15.4520"}, {"type": "t", "text": " PMID: "}, {"type": "a", "children": [{"type": "t", "text": "17671428"}], "href": "https://pubmed.ncbi.nlm.nih.gov/17671428"}]}, {"type": "r", "ref": 4, "children": [{"type": "t", "text": "Ana Dinarina, Patricia G Santamaria, Angel R Nebreda "}, {"type": "b", "children": [{"type": "t", "text": "Cell cycle regulation of the mammalian CDK activator RINGO/Speedy A."}]}, {"type": "t", "text": " "}, {"type": "i", "children": [{"type": "t", "text": "FEBS Lett (2009)"}]}, {"type": "t", "text": " DOI: "}, {"type": "a", "children": [{"type": "t", "text": "10.1016/j.febslet.2009.07.028"}], "href": "https://doi.org/10.1016/j.febslet.2009.07.028"}, {"type": "t", "text": " PMID: "}, {"type": "a", "children": [{"type": "t", "text": "19622356"}], "href": "https://pubmed.ncbi.nlm.nih.gov/19622356"}]}, {"type": "r", "ref": 5, "children": [{"type": "t", "text": "Qing Ke, Juling Ji, Chun Cheng, et al. 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