{"type": "root", "children": [{"type": "p", "children": [{"type": "t", "text": "\nHuman PNPT1 encodes the mitochondrial polynucleotide phosphorylase (PNPase), a conserved 3′→5′ exoribonuclease that plays a central role in mitochondrial RNA metabolism. Rather than residing in the mitochondrial matrix, endogenous PNPase is uniquely localized to the intermembrane space where it regulates the import of select nuclear‐encoded RNAs into the matrix and modulates their processing – including polyadenylation and maturation. In this capacity, PNPase participates in the assembly of an RNA‐degrading “degradosome” (in association with the helicase hSuv3) that safeguards RNA quality control and proper turnover. Disruption of its structural integrity, for example by mutations compromising trimerization, perturbs RNA binding and leads to accumulation of RNA processing intermediates, collectively impairing mitochondrial transcript maturation and respiratory function."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "1", "end_ref": "9"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nApart from its mitochondrial RNA‐handling roles, PNPase is tightly linked to the regulation of cellular homeostasis. Its expression is inducible by type I interferons, and elevated PNPase activity has been shown to selectively degrade oncogenic mRNAs (for example, c‐myc) and key microRNAs (such as miR-221), thereby triggering G1 cell cycle arrest, senescence, and apoptosis in diverse cell types including melanoma cells. These findings implicate PNPase as an important mediator of interferon action and a negative regulator of cell proliferation."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "10", "end_ref": "18"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nMutations or dysregulation of PNPT1 have been increasingly associated with a spectrum of human diseases. Defective PNPase activity—whether due to impaired trimerization, aberrant RNA‐binding, or misregulated transcription driven by promoter elements (involving factors such as SP1 and NFY) and metabolic cues (for example, citrate)—can result in diverse clinical phenotypes. These include mitochondrial respiratory chain deficiencies manifesting as sensorineural hearing loss, Leigh syndrome, neurodegenerative disorders such as spinocerebellar ataxia, and even metabolic disturbances including fatty liver disease; in some studies, associations with altered noncoding SNPs have even been linked to drug-induced side effects. Collectively, these observations underscore the multifaceted role of PNPase in mitochondrial homeostasis, RNA surveillance, and broader cellular regulatory pathways, highlighting its potential as a therapeutic target in both neoplastic and mitochondrial disorders."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "19", "end_ref": "35"}]}, {"type": "t", "text": "\n"}]}, {"type": "rg", "children": [{"type": "r", "ref": 1, "children": [{"type": "t", "text": "Robert N Rainey, Jenny D Glavin, Hsiao-Wen Chen, et al. 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