{"type": "root", "children": [{"type": "p", "children": [{"type": "t", "text": "\nRecent studies have revealed that ASDURF, a polypeptide encoded by an upstream open reading frame (uORF) within the 5′ untranslated region of ASNSD1 mRNA, plays a pivotal role as an integral subunit of the PAQosome—a multi‐subunit chaperone complex involved in the assembly of several human protein complexes. ASDURF exhibits significant structural homology to β‐prefoldins and selectively assembles with five known subunits of the prefoldin‐like module to form a heterohexameric complex. This finding not only uncovers its contribution to the stability and proper biogenesis of the PAQosome but also provides a compelling example that eukaryotic uORF‐encoded peptides can have independent trans roles, extending their functional impact well beyond traditional cis‐acting regulation of downstream coding sequences."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "1"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nThe discovery of ASDURF’s chaperoning role emphasizes the broader biological significance of non‐canonical translational products and highlights the importance of integrating alternative open reading frame (alt‐ORF) products into proteomic studies. While the functional focus of studies such as those examining N‑α‑acetyltransferase 20 (NAA20) in cancer progression points to distinct molecular mechanisms—like the regulation of EGFR signaling via Rab5A in triple‐negative breast cancer"}, {"type": "fg", "children": [{"type": "fg_f", "ref": "2"}]}, {"type": "t", "text": "—the identification of ASDURF as the 12th PAQosome subunit illustrates that unconventional peptides can also serve as critical regulatory components in cellular homeostasis. Such insights compel the reassessment of overlooked genomic regions, encouraging a more inclusive view of the proteome with potential implications for both basic biology and disease research.\n"}]}, {"type": "rg", "children": [{"type": "r", "ref": 1, "children": [{"type": "t", "text": "Philippe Cloutier, Christian Poitras, Denis Faubert, et al. "}, {"type": "b", "children": [{"type": "t", "text": "Upstream ORF-Encoded ASDURF Is a Novel Prefoldin-like Subunit of the PAQosome."}]}, {"type": "t", "text": " "}, {"type": "i", "children": [{"type": "t", "text": "J Proteome Res (2020)"}]}, {"type": "t", "text": " DOI: "}, {"type": "a", "children": [{"type": "t", "text": "10.1021/acs.jproteome.9b00599"}], "href": "https://doi.org/10.1021/acs.jproteome.9b00599"}, {"type": "t", "text": " PMID: "}, {"type": "a", "children": [{"type": "t", "text": "31738558"}], "href": "https://pubmed.ncbi.nlm.nih.gov/31738558"}]}, {"type": "r", "ref": 2, "children": [{"type": "t", "text": "Lei Qiao, Chao Dong, Wenlei Jia, et al. "}, {"type": "b", "children": [{"type": "t", "text": "NAA20 recruits Rin2 and promotes triple-negative breast cancer progression by regulating Rab5A-mediated activation of EGFR signaling."}]}, {"type": "t", "text": " "}, {"type": "i", "children": [{"type": "t", "text": "Cell Signal (2023)"}]}, {"type": "t", "text": " DOI: "}, {"type": "a", "children": [{"type": "t", "text": "10.1016/j.cellsig.2023.110922"}], "href": "https://doi.org/10.1016/j.cellsig.2023.110922"}, {"type": "t", "text": " PMID: "}, {"type": "a", "children": [{"type": "t", "text": "37827343"}], "href": "https://pubmed.ncbi.nlm.nih.gov/37827343"}]}]}]}