DNTTIP1 is a chr20-associated protein that functions as a scaffold for the mitotic deacetylase complex (MiDAC), which it assembles through interaction with MIDEAS and histone deacetylase 1/2 (HDAC1/2). The protein contains a unique dimerization domain and a carboxy-terminal region that mediates direct binding to DNA and nucleosomes, positioning it to recruit HDAC1/2 complexes to target gene promoters. Beyond its structural role in MiDAC, DNTTIP1 acts as a transcriptional regulator, recognizing specific DNA sequences and controlling genes such as RAB20 and BMF. DNTTIP1 is significantly upregulated across multiple cancer types and drives malignant progression through epigenetic silencing of tumor suppressor genes. In nasopharyngeal carcinoma, DNTTIP1 recruits HDAC1 to the DUSP2 promoter, suppressing its expression and activating ERK signaling to promote metastasis 1. In oral squamous cell carcinomas, DNTTIP1-HDAC interaction promotes tumor growth through p53 deacetylation, with DNTTIP1 knockdown causing G1 cell-cycle arrest 2. In acute leukaemia, DNTTIP1 drives leukaemogenesis by silencing the pro-apoptotic gene BMF; DNTTIP1 depletion triggers histone H3K27 hyperacetylation at the BMF promoter and reactivates this effector, with HDAC and BCL2 inhibitors showing synergistic efficacy 3. At the organismal level, DNTTIP1 is essential for embryonic development; mice lacking DNTTIP1 die during late embryogenesis with heart malformation and haematopoietic failure 4. Recent evidence suggests DNTTIP1 also participates in HIV latency control, where it recognizes the HIV core promoter and supports Tat-mediated viral reactivation 5.