{"type": "root", "children": [{"type": "p", "children": [{"type": "t", "text": "\nWDHD1 (also known as AND‑1 or Ctf4) is a critical adaptor protein for DNA replication in eukaryotic cells. It functions at the initiation stage by bridging the replicative helicase complex (CMG, comprising Cdc45, MCM2‑7, and GINS) with DNA polymerase α. Structural and biochemical studies reveal that WDHD1 exists as a homotrimer organized via its SepB domain and contains regions (including a positively charged groove) that facilitate binding to the polymerase. This interaction is essential for promoting the efficient assembly of the pre‑replicative complex on chromatin and for proper replication origin licensing."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "1", "end_ref": "6"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nIn addition to its role in replication initiation, WDHD1 is instrumental in maintaining replication fork integrity and coordinating DNA damage responses. Its WD40 domain, for example, prevents excessive nuclease (MRE11‑dependent) resection at stalled forks, helping to avert the conversion of single‑stranded gaps into deleterious double‑strand breaks. WDHD1 also promotes efficient checkpoint activation by facilitating ATR‑mediated Chk1 phosphorylation and collaborates with factors such as Claspin and CtIP to ensure proper homologous recombination repair and to support sister chromatid cohesion during both replication and centromere assembly."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "7", "end_ref": "11"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nWDHD1 further contributes to genomic maintenance through roles in mismatch repair and chromatin regulation. It forms stable complexes with key mismatch repair proteins (MSH2, MSH3, and MSH6), suggesting its involvement in correcting replication‐induced mismatches. Altered expression or stability of WDHD1 has been linked to oncogenic phenomena—it is upregulated in human papillomavirus E7–expressing cells (thereby promoting G1 checkpoint abrogation and re‑replication) and in several cancer types, including triple‑negative breast cancer, lung adenocarcinoma, and laryngeal carcinoma. Moreover, WDHD1 affects the stability of chromatin modifiers such as Gcn5, implying further influence on histone acetylation and transcriptional regulation. Collectively, these findings nominate WDHD1 as both an essential mediator of DNA replication/repair and a potential biomarker or therapeutic target in malignancies."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "12", "end_ref": "20"}]}, {"type": "t", "text": "\n"}]}, {"type": "rg", "children": [{"type": "r", "ref": 1, "children": [{"type": "t", "text": "Wenge Zhu, Chinweike Ukomadu, Sudhakar Jha, et al. 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"}, {"type": "b", "children": [{"type": "t", "text": "Assembly of the Cdc45-Mcm2-7-GINS complex in human cells requires the Ctf4/And-1, RecQL4, and Mcm10 proteins."}]}, {"type": "t", "text": " "}, {"type": "i", "children": [{"type": "t", "text": "Proc Natl Acad Sci U S A (2009)"}]}, {"type": "t", "text": " DOI: "}, {"type": "a", "children": [{"type": "t", "text": "10.1073/pnas.0908039106"}], "href": "https://doi.org/10.1073/pnas.0908039106"}, {"type": "t", "text": " PMID: "}, {"type": "a", "children": [{"type": "t", "text": "19805216"}], "href": "https://pubmed.ncbi.nlm.nih.gov/19805216"}]}, {"type": "r", "ref": 3, "children": [{"type": "t", "text": "Vladimir P Bermudez, Andrea Farina, Inger Tappin, et al. 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