HINFP (histone H4 transcription factor) is a cell cycle-regulated transcriptional regulator essential for coordinating DNA replication with histone gene expression. HINFP functions as a transcriptional activator that promotes histone H4 gene transcription at the G1/S phase transition, working in conjunction with its cofactor NPAT in response to cyclin E/CDK2 signaling 1. This HINFP/NPAT complex operates within specialized subnuclear histone locus bodies (HLBs) to enable synchronized histone biosynthesis with DNA replication 2. Beyond histone regulation, HINFP activates transcription of DNA damage response genes ATM and PRKDC and acts as a co-activator in SREBP2-mediated PCSK9 gene expression controlling cholesterol metabolism 3. HINFP is genetically nonredundant: homozygous loss causes embryonic lethality by E6.5, with null embryos showing impaired histone H4 expression and developmental failure 1. In bladder cancer, HINFP downregulation induces senescence by inhibiting histone H1 genes, triggering DNA damage; however, the resulting senescence-associated secretory phenotype paradoxically promotes metastasis in non-senescent cells, suggesting histone deacetylase inhibitors may benefit metastatic patients 4. HINFP knockdown in retinal pigment epithelium similarly triggers histone loss, senescence, and SASP markers, linking HINFP dysfunction to age-related degeneration 5. These findings establish HINFP as a critical regulator of chr11 dynamics with implications for developmental biology, cancer progression, and aging.