{"type": "root", "children": [{"type": "p", "children": [{"type": "t", "text": "\nPIWIL2, a member of the PIWI/Argonaute family characterized by conserved PAZ and Piwi domains, is aberrantly expressed in a wide variety of tumors where it functions as an oncogene. Multiple studies have demonstrated that its overexpression promotes cell proliferation, inhibits apoptosis, and facilitates malignant transformation. Mechanistically, PIWIL2 has been shown to activate pro‐survival signaling pathways such as STAT3/Bcl‑X(L) and c‐Myc/CyclinD1, form complexes that suppress the tumor suppressor p53, and induce anti‑apoptotic as well as pro‑invasive responses. These oncogenic effects have been reported in testicular seminomas as well as in breast, colon, glioma, and other cancers."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "1", "end_ref": "13"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nBeyond its direct oncogenic properties, PIWIL2 plays a pivotal role in the maintenance of cancer stem cell features and the reprogramming of somatic cells into tumor‑initiating cells. Investigations in breast, colorectal, and cervical cancers have shown that PIWIL2 is enriched in cancer stem cell populations, where its expression not only sustains stemness by activating reprogramming factors and canonical Wnt signaling but also facilitates the acquisition of tumor‑initiating capabilities. Thus, PIWIL2 contributes to tumor heterogeneity, metastasis and resistance to therapy."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "14", "end_ref": "21"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nIn addition to its effects on tumor cell growth, PIWIL2 is implicated in modulating epigenetic programs and ensuring genomic stability. It has been reported to participate in the DNA damage response by promoting histone H3 acetylation and chromatin relaxation, and to negatively regulate transforming growth factor‑β (TGF‑β) signaling via interaction with Hsp90 and the promotion of receptor degradation. PIWIL2 also stabilizes epigenetic regulators such as HDAC3, thereby influencing gene transcription relevant to cellular proliferation and survival."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "22", "end_ref": "24"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nPIWIL2 also plays an essential role in the germline. It is critical for piRNA biogenesis and transposon control during spermatogenesis, thereby contributing to genome integrity in reproductive cells. Aberrant promoter hypermethylation or altered expression of PIWIL2 is linked to impaired spermatogenesis and male infertility, and studies in both human spermatozoa and animal models have highlighted its potential as a molecular marker of sperm quality."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "25", "end_ref": "32"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nRemarkably, PIWIL2 has also been implicated in host defense against viral elements. In activated CD4+ T cells, PIWIL2 (also known as HILI) can bind specific tRNAs and inhibit the replication of HIV, suggesting a broader role in controlling both exogenous and endogenous mobile genetic elements."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "33"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nThe expression profile of PIWIL2 further underscores its potential as a biomarker and prognostic indicator in diverse human malignancies. In various studies, its expression levels in cancers such as papillary thyroid carcinoma, prostate cancer, bladder cancer, cholangiocarcinoma, and breast cancer have been correlated with advanced disease stage, increased invasion and metastasis, and poorer patient survival. Such findings highlight its promise not only as a diagnostic marker but also as a potential target for therapeutic intervention."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "34", "end_ref": "44"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nFinally, outside the context of cancer and reproduction, aberrant PIWIL2 expression has been noted in normal somatic tissues. For instance, its expression in skin and adnexal structures has been linked to the regulation of keratinocyte differentiation, and preliminary evidence in rheumatoid arthritis suggests potential roles in modulating inflammatory responses."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "45"}]}, {"type": "t", "text": "\n"}]}, {"type": "rg", "children": [{"type": "r", "ref": 1, "children": [{"type": "t", "text": "Jae Ho Lee, Dorothea Schütte, Gerald Wulf, et al. 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