{"type": "root", "children": [{"type": "p", "children": [{"type": "t", "text": "\nNASP is an essential histone chaperone that safeguards the supply of soluble histones and orchestrates nucleosome assembly during DNA replication, repair, and embryogenesis. Both somatic (sNASP) and testicular (tNASP) isoforms interact with core histones H3–H4 and the linker histone H1 via conserved tetratricopeptide repeat (TPR) domains, thereby facilitating proper chromatin formation, genome packaging, and cell cycle progression. Quantitative and biophysical studies have demonstrated that NASP forms distinct high‐specificity complexes with histones, underscoring its indispensable role in chromatin remodeling and nuclear assembly."}, {"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": "\nBeyond its classical role in nucleosome assembly, NASP functions as a dynamic regulator of histone supply, especially under conditions of replication stress and in oncogenic settings. By protecting a reservoir of soluble H3–H4, NASP fine-tunes histone degradation via chaperone-mediated autophagy and maintains chromatin integrity when demand surges unexpectedly. Differential expression and isoform-specific properties—as well as regulation by microRNAs (e.g., miR-29a and miR-381-3p) and long noncoding RNAs like CRNDE—modulate NASP levels, thereby impacting cell cycle progression, tumorigenesis, and responses mediated through pathways such as ERK/MAPK."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "10", "end_ref": "15"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nStructural dissection of NASP has revealed that its TPR motifs mediate high-affinity interactions not only with canonical histones but also with conserved peptide motifs present in all histone H3 variants. Furthermore, NASP interacts with additional chaperone proteins such as UBR7, thereby influencing the recycling and reincorporation of post-nucleosomal histone complexes. Recent findings also indicate that phosphorylation of NASP can modulate its association with key signaling factors like TRAF6, linking histone chaperoning to the regulation of innate immune responses."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "16", "end_ref": "18"}]}, {"type": "t", "text": "\n"}]}, {"type": "rg", "children": [{"type": "r", "ref": 1, "children": [{"type": "t", "text": "Richard T Richardson, Oleg M Alekseev, Gail Grossman, et al. 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