{"type": "root", "children": [{"type": "p", "children": [{"type": "t", "text": "\nThe four studies collectively illustrate the central role of RNA processing—specifically, the regulation of alternative polyadenylation by Nudt21 (also known as CFIm25)—in orchestrating cell fate decisions, transcript isoform diversity, and tissue remodeling. Although none of these abstracts directly address SNORA13, the findings provide important context for RNA‐mediated regulatory mechanisms that could extend to other RNA species. For instance, in cellular reprogramming and differentiation, suppression of Nudt21 accelerates the acquisition of pluripotency and alters differentiation trajectories by modulating the 3′ untranslated regions (3′UTRs) of over 1,500 transcripts, many of which encode chromatin regulators that subsequently influence cell identity and fate."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "1"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nIn the male germ cell context, alternative polyadenylation is harnessed to generate cell-specific mRNA isoforms that often forgo canonical polyadenylation signals. Here, CFIm subunits, including Nudt21, are expressed as shorter mRNAs in spermatogenic cells, suggesting an autoregulatory mechanism that fine-tunes their levels to facilitate proper transcript maturation during spermatogenesis."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "2"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nMoreover, both idiopathic pulmonary fibrosis and systemic sclerosis exhibit downregulation of CFIm25/Nudt21, leading to widespread 3′UTR shortening of key pro-fibrotic transcripts. This process removes microRNA binding sites, enhances the translation of fibrotic factors, and ultimately drives extracellular matrix remodeling and fibrotic pathology."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "3"}]}, {"type": "t", "text": " Together, these studies underscore the importance of alternative polyadenylation in both normal developmental processes and disease states, and while they do not specifically assess SNORA13, they lay a foundation for exploring how other noncoding RNAs might intersect with these post-transcriptional regulatory pathways.\n"}]}, {"type": "rg", "children": [{"type": "r", "ref": 1, "children": [{"type": "t", "text": "Justin Brumbaugh, Bruno Di Stefano, Xiuye Wang, et al. "}, {"type": "b", "children": [{"type": "t", "text": "Nudt21 Controls Cell Fate by Connecting Alternative Polyadenylation to Chromatin Signaling."}]}, {"type": "t", "text": " "}, {"type": "i", "children": [{"type": "t", "text": "Cell (2018)"}]}, {"type": "t", "text": " DOI: "}, {"type": "a", "children": [{"type": "t", "text": "10.1016/j.cell.2017.11.023"}], "href": "https://doi.org/10.1016/j.cell.2017.11.023"}, {"type": "t", "text": " PMID: "}, {"type": "a", "children": [{"type": "t", "text": "29249356"}], "href": "https://pubmed.ncbi.nlm.nih.gov/29249356"}]}, {"type": "r", "ref": 2, "children": [{"type": "t", "text": "Becky L Sartini, Hang Wang, Wei Wang, et al. "}, {"type": "b", "children": [{"type": "t", "text": "Pre-messenger RNA cleavage factor I (CFIm): potential role in alternative polyadenylation during spermatogenesis."}]}, {"type": "t", "text": " "}, {"type": "i", "children": [{"type": "t", "text": "Biol Reprod (2008)"}]}, {"type": "t", "text": " DOI: "}, {"type": "a", "children": [{"type": "t", "text": "10.1095/biolreprod.107.064774"}], "href": "https://doi.org/10.1095/biolreprod.107.064774"}, {"type": "t", "text": " PMID: "}, {"type": "a", "children": [{"type": "t", "text": "18032416"}], "href": "https://pubmed.ncbi.nlm.nih.gov/18032416"}]}, {"type": "r", "ref": 3, "children": [{"type": "t", "text": "Tingting Weng, Junsuk Ko, Chioniso P Masamha, et al. "}, {"type": "b", "children": [{"type": "t", "text": "Cleavage factor 25 deregulation contributes to pulmonary fibrosis through alternative polyadenylation."}]}, {"type": "t", "text": " "}, {"type": "i", "children": [{"type": "t", "text": "J Clin Invest (2019)"}]}, {"type": "t", "text": " DOI: "}, {"type": "a", "children": [{"type": "t", "text": "10.1172/JCI122106"}], "href": "https://doi.org/10.1172/JCI122106"}, {"type": "t", "text": " PMID: "}, {"type": "a", "children": [{"type": "t", "text": "30830875"}], "href": "https://pubmed.ncbi.nlm.nih.gov/30830875"}]}, {"type": "r", "ref": 4, "children": [{"type": "t", "text": "Tingting Weng, Jingjing Huang, Eric J Wagner, et al. "}, {"type": "b", "children": [{"type": "t", "text": "Downregulation of CFIm25 amplifies dermal fibrosis through alternative polyadenylation."}]}, {"type": "t", "text": " "}, {"type": "i", "children": [{"type": "t", "text": "J Exp Med (2020)"}]}, {"type": "t", "text": " DOI: "}, {"type": "a", "children": [{"type": "t", "text": "10.1084/jem.20181384"}], "href": "https://doi.org/10.1084/jem.20181384"}, {"type": "t", "text": " PMID: "}, {"type": "a", "children": [{"type": "t", "text": "31757866"}], "href": "https://pubmed.ncbi.nlm.nih.gov/31757866"}]}]}]}