{"type": "root", "children": [{"type": "p", "children": [{"type": "t", "text": "\nSETD1B encodes a lysine methyltransferase that plays a central role in chromatin regulation by catalyzing histone H3 lysine‐4 (H3K4) methylation and thereby promoting active transcription. Intriguingly, in addition to its canonical nuclear activity, a cytoplasmic variant of SETD1B exerts a non‐catalytic function that is essential for cell viability and modulates metabolic gene expression via ADIPOR1 signaling. Structural studies of its RNA recognition motif (RRM) further suggest that SETD1B contributes to the proper assembly of COMPASS (complex of proteins associated with Set1) complex components, emphasizing its multi‐faceted role in gene expression regulation."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "1", "end_ref": "5"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nIn the neurodevelopmental context, de novo missense and frameshift variants as well as microdeletions affecting SETD1B have been linked to a syndromic disorder marked by intellectual disability, language delay, seizures, and autistic features. The disruption of the SET domain—critical for its methyltransferase activity—establishes SETD1B as an essential epigenetic regulator required for proper neuronal gene expression and craniofacial development."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "6", "end_ref": "8"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nBeyond developmental disorders, aberrations in SETD1B have been implicated in various cancers. Recurrent frameshift mutations in SETD1B are observed in gastrointestinal malignancies—including gastric and colorectal cancers with microsatellite instability—and in primary hepatic neuroendocrine tumors, where mutant forms promote cell proliferation, migration, and invasion. In hepatocellular carcinoma, overexpression of SETD1B correlates with larger tumor size, advanced clinical stage, and reduced overall survival. Moreover, in hematologic malignancies such as acute megakaryoblastic leukemia and follicular lymphoma, SETD1B dysregulation alters the expression of key pro‐apoptotic genes, contributing to drug resistance and tumor progression, thereby underscoring its potential as a prognostic marker and therapeutic target."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "9", "end_ref": "14"}]}, {"type": "t", "text": "\n"}]}, {"type": "rg", "children": [{"type": "r", "ref": 1, "children": [{"type": "t", "text": "Lu Wang, Clayton K Collings, Zibo Zhao, et al. 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"}, {"type": "b", "children": [{"type": "t", "text": "An atypical 12q24.31 microdeletion implicates six genes including a histone demethylase KDM2B and a histone methyltransferase SETD1B in syndromic intellectual disability."}]}, {"type": "t", "text": " "}, {"type": "i", "children": [{"type": "t", "text": "Hum Genet (2016)"}]}, {"type": "t", "text": " DOI: "}, {"type": "a", "children": [{"type": "t", "text": "10.1007/s00439-016-1668-4"}], "href": "https://doi.org/10.1007/s00439-016-1668-4"}, {"type": "t", "text": " PMID: "}, {"type": "a", "children": [{"type": "t", "text": "27106595"}], "href": "https://pubmed.ncbi.nlm.nih.gov/27106595"}]}, {"type": "r", "ref": 4, "children": [{"type": "t", "text": "I M Krzyzewska, S M Maas, P Henneman, et al. 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