{"type": "root", "children": [{"type": "p", "children": [{"type": "t", "text": "\nSECIS‐binding protein 2 (SECISBP2) is a pivotal protein in the synthesis of selenoproteins. It recognizes and binds to the SECIS element—a specialized RNA hairpin located in the 3′ untranslated region of selenoprotein mRNAs—and, through its conserved RNA‐binding domain, helps recode UGA stop codons to insert selenocysteine during translation. Structural and mutagenesis studies have defined key residues that govern its association with SECIS RNA and have revealed that SECISBP2 undergoes conformational changes and nucleocytoplasmic shuttling (in response to oxidative cues) that promote the recruitment of the Sec-specific elongation factor and proper positioning within the ribosomal A site."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "1", "end_ref": "6"}]}, {"type": "t", "text": "\n\nDefects or mutations in SECISBP2 disrupt this finely tuned process, leading to a marked reduction in the synthesis of most selenoproteins and producing a wide range of clinical phenotypes. Genetic variants have been associated with multisystem disorders that include altered thyroid hormone metabolism, muscular dystrophy, impaired antioxidant defense and immune dysregulation, as well as potential links to cancer predisposition. Moreover, alternative splicing events and post‐transcriptional modulation by other RNA-binding proteins further influence SECISBP2 levels, thereby dictating the hierarchy of selenoprotein expression required for maintaining cellular redox balance and metabolic homeostasis."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "7", "end_ref": "14"}]}, {"type": "t", "text": "\n\nRecent investigations have extended our understanding of SECISBP2 by highlighting its tissue‐specific roles and additional regulatory nuances. In contexts such as osteoarthritis, trophoblast biology, and diffuse large B-cell lymphoma, SECISBP2 has been implicated not only in sustaining selenoprotein expression to counteract oxidative stress but also in regulating cell proliferation. Furthermore, studies have revealed that SECISBP2 expression and localization can be modulated by alternative splicing and microRNA interactions, adding extra layers of translational control that enable diverse cellular responses to metabolic and environmental challenges."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "15", "end_ref": "20"}]}, {"type": "t", "text": ""}]}, {"type": "rg", "children": [{"type": "r", "ref": 1, "children": [{"type": "t", "text": "Erik Schoenmakers, Maura Agostini, Catherine Mitchell, et al. 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"}, {"type": "b", "children": [{"type": "t", "text": "The redox state of SECIS binding protein 2 controls its localization and selenocysteine incorporation function."}]}, {"type": "t", "text": " "}, {"type": "i", "children": [{"type": "t", "text": "Mol Cell Biol (2006)"}]}, {"type": "t", "text": " DOI: "}, {"type": "a", "children": [{"type": "t", "text": "10.1128/MCB.02284-05"}], "href": "https://doi.org/10.1128/MCB.02284-05"}, {"type": "t", "text": " PMID: "}, {"type": "a", "children": [{"type": "t", "text": "16782878"}], "href": "https://pubmed.ncbi.nlm.nih.gov/16782878"}]}, {"type": "r", "ref": 4, "children": [{"type": "t", "text": "Christine Allmang, Philippe Carbon, Alain Krol "}, {"type": "b", "children": [{"type": "t", "text": "The SBP2 and 15.5 kD/Snu13p proteins share the same RNA binding domain: identification of SBP2 amino acids important to SECIS RNA binding."}]}, {"type": "t", "text": " "}, {"type": "i", "children": [{"type": "t", "text": "RNA (2002)"}]}, {"type": "t", "text": " DOI: "}, {"type": "a", "children": [{"type": "t", "text": "10.1017/s1355838202020034"}], "href": "https://doi.org/10.1017/s1355838202020034"}, {"type": "t", "text": " PMID: "}, {"type": "a", "children": [{"type": "t", "text": "12403468"}], "href": "https://pubmed.ncbi.nlm.nih.gov/12403468"}]}, {"type": "r", "ref": 5, "children": [{"type": "t", "text": "Jesse Donovan, Kelvin Caban, Ruchira Ranaweera, et al. 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