{"type": "root", "children": [{"type": "p", "children": [{"type": "t", "text": "\nSAMHD1 plays a pivotal role as an innate antiviral factor that restricts lentiviral infections—most notably HIV‐1—by depleting the intracellular pool of deoxynucleoside triphosphates (dNTPs) needed for reverse transcription. Expressed predominantly in nondividing myeloid cells and resting CD4⁺ T lymphocytes, SAMHD1 impedes early viral DNA synthesis. This antiviral block can be overcome when lentiviral accessory proteins such as Vpx target SAMHD1 for proteasomal degradation, thereby restoring dNTP availability and facilitating viral replication."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "1", "end_ref": "10"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nIn addition to its antiviral role, SAMHD1 functions as a dGTP‐stimulated deoxynucleotide triphosphohydrolase that hydrolyzes dNTPs, thereby maintaining nucleotide homeostasis in the cell. Its enzymatic activity depends on intricate allosteric regulation that promotes tetramer formation and is further modulated by posttranslational modifications – notably phosphorylation (for example, at threonine 592) – which can diminish its viral restriction ability without necessarily altering its dNTPase function. Moreover, interactions with cellular factors and responsiveness to fluctuations in nucleotide levels ensure that SAMHD1 activity is tuned in both proliferating and nondividing cells; this balance is critical for countering viral reverse transcription and for adapting to viral countermeasures that trigger proteasomal degradation."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "11", "end_ref": "31"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nBeyond its direct antiviral and nucleotide-regulating functions, SAMHD1 exerts broader effects on cellular homeostasis. Dysregulation of SAMHD1 is implicated in immune modulation, as evidenced by its links with autoinflammatory conditions such as Aicardi–Goutières syndrome and systemic lupus erythematosus, where impaired processing of endogenous nucleic acids may aberrantly activate type I interferon responses. 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