{"type": "root", "children": [{"type": "p", "children": [{"type": "t", "text": "\nRAG1 is a lymphoid‐specific endonuclease that, together with its partner RAG2, initiates V(D)J recombination—the precisely orchestrated process that cleaves DNA at recombination signal sequences to generate diverse antigen receptor (T‐ and B‐cell) genes. This catalytic activity is essential not only for assembling primary receptor repertoires during lymphocyte development but also for secondary receptor editing in mature cells, thereby helping to shape immune tolerance. Moreover, naturally occurring polymorphisms and hypomorphic mutations in RAG1 have been implicated in conditions ranging from severe combined immunodeficiency and Omenn syndrome to subtler immune dysregulation and even associations with cancer risk."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "1", "end_ref": "16"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nBeyond its canonical role in DNA cleavage, RAG1 contains regulatory domains outside its core catalytic region that modulate recombination efficiency and genomic targeting. In particular, its noncore RING domain confers ubiquitin ligase activity capable of monoubiquitylating histone H3 and potentially other nuclear factors, thereby influencing local chromatin accessibility and integration of repair signals. RAG1 also interacts with various transcription factors and components of the DNA damage response—including pathways activated by constitutive “tonic” receptor signaling and ATM‐mediated feedback—to ensure that cleavage events are properly coupled to DNA repair. These layers of regulation minimize off‐target breaks and maintain genomic integrity during antigen receptor assembly."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "17", "end_ref": "32"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nDefects in RAG1 function—whether through inherited mutations, hypomorphic alleles, or polymorphic variations—are linked to a diverse array of clinical pathologies. 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