{"type": "root", "children": [{"type": "p", "children": [{"type": "t", "text": "\nPumilio RNA‐binding protein 1 (PUM1) is a highly conserved posttranscriptional regulator that binds specific sequence elements in the 3′ untranslated regions of target mRNAs, thereby modulating their stability, decay, and translation. Early studies revealed that PUM1 recognizes a consensus “UGUA” motif in target RNAs and can promote mRNA decay and translational repression, thus directly regulating genes involved in transcription and cell cycle progression."}, {"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": "\nPUM1 activity is intricately linked to genome stability and cell cycle control. The long noncoding RNA NORAD, for instance, safeguards genomic integrity by sequestering PUM proteins, preventing their hyper-repressive activity on mRNAs encoding critical factors for mitosis, DNA repair, and replication."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "5"}]}, {"type": "t", "text": " In hematopoietic and mesenchymal stem/progenitor cells, PUM1 helps maintain proliferation and proper differentiation, in part by modulating the stability of mRNAs such as FOXP1 and TLR4, thereby impacting cell cycle regulators and pathways like NF‐κB."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "7"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nIn the context of cancer and other proliferative diseases, PUM1 exerts a dualistic role. It contributes to oncogenic processes by repressing key tumor suppressors and regulating mRNAs encoding cell cycle drivers—for example, by limiting the translation of E2F3 and PrPC and modulating mRNA decay through direct association with the CCR4–NOT deadenylase complex."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "9", "end_ref": "14"}]}, {"type": "t", "text": " Moreover, studies in pancreatic and gastric cancer have demonstrated that altered PUM1 levels support tumor cell proliferation, invasion, and immune escape, partly by affecting signaling pathways such as PERK/eIF2/ATF4 and by upregulating factors like PD‐L1 through stabilization of intermediary transcripts."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "15"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nBeyond its role in proliferative control, PUM1 is essential for proper developmental and neurological function. In germ cells and embryonic stem cells, PUM1 contributes to the maintenance of pluripotency by supporting the expression of factors such as OCT4 and NANOG and by orchestrating posttranscriptional regulons that impact germ cell fate."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "17"}]}, {"type": "t", "text": " Disruption of PUM1 function—either by haploinsufficiency or by pathogenic mutations—has been associated with neurodegeneration and spinocerebellar ataxia, highlighting its dosage-sensitive role in neuronal integrity."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "19"}, {"type": "fg_f", "ref": "10"}]}, {"type": "t", "text": " Additionally, in erythropoiesis, PUM1 regulates hemoglobin switching by binding to γ-globin mRNA, thereby modulating its stability and translation."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "20"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nMechanistically, PUM1 mediates its regulatory effects through versatile interactions with its target RNAs. It can induce local structural changes that facilitate microRNA binding"}, {"type": "fg", "children": [{"type": "fg_f", "ref": "2"}]}, {"type": "t", "text": ", promote deadenylation and decapping by recruiting effector complexes like CCR4–NOT"}, {"type": "fg", "children": [{"type": "fg_f", "ref": "21"}]}, {"type": "t", "text": ", and even participate in RNA-driven phase separation events that modulate its availability and activity."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "22"}]}, {"type": "t", "text": " Further expanding its functional repertoire, aberrant interactions involving PUM1 have been implicated in the dysregulation of innate immunity, as it normally represses key immune modulators such as LGP2"}, {"type": "fg", "children": [{"type": "fg_f", "ref": "23"}]}, {"type": "t", "text": ", and in altering posttranscriptional networks in response to mutations affecting other critical regulators, as seen with a DICER1 syndrome allele that disrupts PUM1 binding."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "24"}]}, {"type": "t", "text": " Finally, in conditions such as preeclampsia, PUM1 forms part of a regulatory axis involving microRNAs and other RNA-binding proteins"}, {"type": "fg", "children": [{"type": "fg_f", "ref": "25"}]}, {"type": "t", "text": ", while its baseline stability has even positioned it as a candidate reference gene in certain gene expression studies."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "26"}]}, {"type": "t", "text": "\n"}]}, {"type": "rg", "children": [{"type": "r", "ref": 1, "children": [{"type": "t", "text": "Adam R Morris, Neelanjan Mukherjee, Jack D Keene "}, {"type": "b", "children": [{"type": "t", "text": "Ribonomic analysis of human Pum1 reveals cis-trans conservation across species despite evolution of diverse mRNA target sets."}]}, {"type": "t", "text": " "}, {"type": "i", "children": [{"type": "t", "text": "Mol Cell Biol (2008)"}]}, {"type": "t", "text": " DOI: "}, {"type": "a", "children": [{"type": "t", "text": "10.1128/MCB.00155-08"}], "href": "https://doi.org/10.1128/MCB.00155-08"}, {"type": "t", "text": " PMID: "}, {"type": "a", "children": [{"type": "t", "text": "18411299"}], "href": "https://pubmed.ncbi.nlm.nih.gov/18411299"}]}, {"type": "r", "ref": 2, "children": [{"type": "t", "text": "Martijn Kedde, Marieke van Kouwenhove, Wilbert Zwart, et al. 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