{"type": "root", "children": [{"type": "p", "children": [{"type": "t", "text": "\nBRUCE (also known as Apollon or BIRC6) is a multifunctional protein that plays a central role in the regulation of cell survival. It acts as an inhibitor of apoptosis through direct suppression of caspase activity and by functioning as a chimeric E2/E3 ubiquitin ligase—activities that are critical during embryonic development and tissue differentiation. In several studies, inactivation or truncation of BRUCE has been linked to impaired placental development, loss of trophoblast cell proliferation, upregulation of mitochondrial death signals via p53, and consequent embryonic lethality, highlighting its essential role in promoting cell viability in vivo."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "1", "end_ref": "4"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nIn addition to its antiapoptotic function, BRUCE contributes to the maintenance of cellular homeostasis by regulating autophagy and the DNA damage response (DDR). It facilitates autolysosome formation through selective interactions with key autophagy regulators such as GABARAP, GABARAPL1, and Syntaxin 17. Moreover, BRUCE acts as a molecular scaffold to coordinate deubiquitination events that promote the recruitment of chromatin remodelers to sites of DNA double-strand breaks, thereby enhancing homologous recombination repair and preserving genomic stability."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "5"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nBRUCE’s activity extends to tissue-specific contexts, where its regulated expression is critical for protecting diverse cell types. In skeletal muscle, signaling through prostaglandin F2α and NFAT pathways leads to upregulation of BRUCE, thereby reducing apoptosis and promoting myotube growth. In neuronal cells, Humanin-induced activation of the JAK/STAT pathway increases BRUCE levels, conferring protection against Alzheimer’s disease–linked neurotoxicity. Furthermore, BRUCE is indispensable for the maintenance of genomic stability in the male germline, where its absence results in impaired spermatogenesis and chromosomal aberrations, while in models of axonal dystrophy, modulation via microRNA (miR-204) alters its interaction with Syntaxin 17 to influence autophagosome-lysosome fusion and retrograde neurotrophic signaling."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "7", "end_ref": "10"}]}, {"type": "t", "text": "\n"}]}, {"type": "rg", "children": [{"type": "r", "ref": 1, "children": [{"type": "t", "text": "Till Bartke, Christian Pohl, George Pyrowolakis, et al. "}, {"type": "b", "children": [{"type": "t", "text": "Dual role of BRUCE as an antiapoptotic IAP and a chimeric E2/E3 ubiquitin ligase."}]}, {"type": "t", "text": " "}, {"type": "i", "children": [{"type": "t", "text": "Mol Cell (2004)"}]}, {"type": "t", "text": " DOI: "}, {"type": "a", "children": [{"type": "t", "text": "10.1016/j.molcel.2004.05.018"}], "href": "https://doi.org/10.1016/j.molcel.2004.05.018"}, {"type": "t", "text": " PMID: "}, {"type": "a", "children": [{"type": "t", "text": "15200957"}], "href": "https://pubmed.ncbi.nlm.nih.gov/15200957"}]}, {"type": "r", "ref": 2, "children": [{"type": "t", "text": "Kristina Lotz, George Pyrowolakis, Stefan Jentsch "}, {"type": "b", "children": [{"type": "t", "text": "BRUCE, a giant E2/E3 ubiquitin ligase and inhibitor of apoptosis protein of the trans-Golgi network, is required for normal placenta development and mouse survival."}]}, {"type": "t", "text": " "}, {"type": "i", "children": [{"type": "t", "text": "Mol Cell Biol (2004)"}]}, {"type": "t", "text": " DOI: "}, {"type": "a", "children": [{"type": "t", "text": "10.1128/MCB.24.21.9339-9350.2004"}], "href": "https://doi.org/10.1128/MCB.24.21.9339-9350.2004"}, {"type": "t", "text": " PMID: "}, {"type": "a", "children": [{"type": "t", "text": "15485903"}], "href": "https://pubmed.ncbi.nlm.nih.gov/15485903"}]}, {"type": "r", "ref": 3, "children": [{"type": "t", "text": "Jinyu Ren, Mingan Shi, Renshui Liu, et al. "}, {"type": "b", "children": [{"type": "t", "text": "The Birc6 (Bruce) gene regulates p53 and the mitochondrial pathway of apoptosis and is essential for mouse embryonic development."}]}, {"type": "t", "text": " "}, {"type": "i", "children": [{"type": "t", "text": "Proc Natl Acad Sci U S A (2005)"}]}, {"type": "t", "text": " DOI: "}, {"type": "a", "children": [{"type": "t", "text": "10.1073/pnas.0408744102"}], "href": "https://doi.org/10.1073/pnas.0408744102"}, {"type": "t", "text": " PMID: "}, {"type": "a", "children": [{"type": "t", "text": "15640352"}], "href": "https://pubmed.ncbi.nlm.nih.gov/15640352"}]}, {"type": "r", "ref": 4, "children": [{"type": "t", "text": "Christiane Hitz, Daniela Vogt-Weisenhorn, Patricia Ruiz, et al. "}, {"type": "b", "children": [{"type": "t", "text": "Progressive loss of the spongiotrophoblast layer of Birc6/Bruce mutants results in embryonic lethality."}]}, {"type": "t", "text": " "}, {"type": "i", "children": [{"type": "t", "text": "Genesis (2005)"}]}, {"type": "t", "text": " DOI: "}, {"type": "a", "children": [{"type": "t", "text": "10.1002/gene.20128"}], "href": "https://doi.org/10.1002/gene.20128"}, {"type": "t", "text": " PMID: "}, {"type": "a", "children": [{"type": "t", "text": "15887267"}], "href": "https://pubmed.ncbi.nlm.nih.gov/15887267"}]}, {"type": "r", "ref": 5, "children": [{"type": "t", "text": "Chunmin Ge, Lixiao Che, Jinyu Ren, et al. "}, {"type": "b", "children": [{"type": "t", "text": "BRUCE regulates DNA double-strand break response by promoting USP8 deubiquitination of BRIT1."}]}, {"type": "t", "text": " "}, {"type": "i", "children": [{"type": "t", "text": "Proc Natl Acad Sci U S A (2015)"}]}, {"type": "t", "text": " DOI: "}, {"type": "a", "children": [{"type": "t", "text": "10.1073/pnas.1418335112"}], "href": "https://doi.org/10.1073/pnas.1418335112"}, {"type": "t", "text": " PMID: "}, {"type": "a", "children": [{"type": "t", "text": "25733871"}], "href": "https://pubmed.ncbi.nlm.nih.gov/25733871"}]}, {"type": "r", "ref": 6, "children": [{"type": "t", "text": "Petra Ebner, Isabella Poetsch, Luiza Deszcz, et al. "}, {"type": "b", "children": [{"type": "t", "text": "The IAP family member BRUCE regulates autophagosome-lysosome fusion."}]}, {"type": "t", "text": " "}, {"type": "i", "children": [{"type": "t", "text": "Nat Commun (2018)"}]}, {"type": "t", "text": " DOI: "}, {"type": "a", "children": [{"type": "t", "text": "10.1038/s41467-018-02823-x"}], "href": "https://doi.org/10.1038/s41467-018-02823-x"}, {"type": "t", "text": " PMID: "}, {"type": "a", "children": [{"type": "t", "text": "29426817"}], "href": "https://pubmed.ncbi.nlm.nih.gov/29426817"}]}, {"type": "r", "ref": 7, "children": [{"type": "t", "text": "K M Jansen, G K Pavlath "}, {"type": "b", "children": [{"type": "t", "text": "Prostaglandin F2alpha promotes muscle cell survival and growth through upregulation of the inhibitor of apoptosis protein BRUCE."}]}, {"type": "t", "text": " "}, {"type": "i", "children": [{"type": "t", "text": "Cell Death Differ (2008)"}]}, {"type": "t", "text": " DOI: "}, {"type": "a", "children": [{"type": "t", "text": "10.1038/cdd.2008.90"}], "href": "https://doi.org/10.1038/cdd.2008.90"}, {"type": "t", "text": " PMID: "}, {"type": "a", "children": [{"type": "t", "text": "18566603"}], "href": "https://pubmed.ncbi.nlm.nih.gov/18566603"}]}, {"type": "r", "ref": 8, "children": [{"type": "t", "text": "Yuichi Hashimoto, Yuji Takeshita, Mikihiko Naito, et al. 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"}, {"type": "b", "children": [{"type": "t", "text": "BRUCE preserves genomic stability in the male germline of mice."}]}, {"type": "t", "text": " "}, {"type": "i", "children": [{"type": "t", "text": "Cell Death Differ (2020)"}]}, {"type": "t", "text": " DOI: "}, {"type": "a", "children": [{"type": "t", "text": "10.1038/s41418-020-0513-4"}], "href": "https://doi.org/10.1038/s41418-020-0513-4"}, {"type": "t", "text": " PMID: "}, {"type": "a", "children": [{"type": "t", "text": "32139899"}], "href": "https://pubmed.ncbi.nlm.nih.gov/32139899"}]}, {"type": "r", "ref": 10, "children": [{"type": "t", "text": "Lu Zhang, Yu Fang, Xinyu Zhao, et al. 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