{"type": "root", "children": [{"type": "p", "children": [{"type": "t", "text": "\nRecent studies have revealed that SMIM27 (also known as HMGB4) plays a critical role in mediating the cellular response to DNA damage. In one investigation, SMIM27 was shown to bind cisplatin‐modified DNA lesions—specifically the 1,2-intrastrand d(GpG) cross-link—with exceptionally high affinity. This strong binding, which is reinforced by the absence of a C-terminal acidic tail and the pivotal contribution of residue Phe37, markedly interferes with the repair of these lesions. Such effects may underlie the noted hypersensitivity of testicular germ cell tumors to cisplatin-based therapy."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "1"}]}, {"type": "t", "text": ""}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nIn a complementary study focusing on non-germ cell contexts, SMIM27 was found to be expressed in neuronal cells, where it localizes to the nucleus and interacts with histones. Its expression leads to altered post-translational modifications of histones and a significant shift in the transcriptional landscape—with over 800 genes affected—including those linked to neuronal differentiation. Moreover, overexpression of SMIM27 increases cellular susceptibility to topoisomerase inhibitors, underscoring a role in modulating chromatin dynamics and cell viability in response to chemotherapeutic agents."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "2"}]}, {"type": "t", "text": ""}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nTogether, these findings portray SMIM27 as a multifaceted regulator that integrates DNA damage recognition and chromatin remodeling functions. On one hand, its strong and structurally unique binding to cisplatin-damaged DNA disrupts repair processes, potentially contributing to chemotherapy sensitivity. On the other, its involvement in modulating histone modifications and regulating gene expression in neuronal cells suggests roles in cellular differentiation and survival. These dual aspects make SMIM27 an intriguing target for further studies in both oncologic and neurological contexts."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "1"}]}, {"type": "t", "text": ""}]}, {"type": "rg", "children": [{"type": "r", "ref": 1, "children": [{"type": "t", "text": "Semi Park, Stephen J Lippard "}, {"type": "b", "children": [{"type": "t", "text": "Binding interaction of HMGB4 with cisplatin-modified DNA."}]}, {"type": "t", "text": " "}, {"type": "i", "children": [{"type": "t", "text": "Biochemistry (2012)"}]}, {"type": "t", "text": " DOI: "}, {"type": "a", "children": [{"type": "t", "text": "10.1021/bi300649v"}], "href": "https://doi.org/10.1021/bi300649v"}, {"type": "t", "text": " PMID: "}, {"type": "a", "children": [{"type": "t", "text": "22901013"}], "href": "https://pubmed.ncbi.nlm.nih.gov/22901013"}]}, {"type": "r", "ref": 2, "children": [{"type": "t", "text": "Ari Rouhiainen, Xiang Zhao, Päivi Vanttola, et al. "}, {"type": "b", "children": [{"type": "t", "text": "HMGB4 is expressed by neuronal cells and affects the expression of genes involved in neural differentiation."}]}, {"type": "t", "text": " "}, {"type": "i", "children": [{"type": "t", "text": "Sci Rep (2016)"}]}, {"type": "t", "text": " DOI: "}, {"type": "a", "children": [{"type": "t", "text": "10.1038/srep32960"}], "href": "https://doi.org/10.1038/srep32960"}, {"type": "t", "text": " PMID: "}, {"type": "a", "children": [{"type": "t", "text": "27608812"}], "href": "https://pubmed.ncbi.nlm.nih.gov/27608812"}]}]}]}