{"type": "root", "children": [{"type": "p", "children": [{"type": "t", "text": "\n The CDAN1 gene encodes codanin‐1, a large, ubiquitously expressed protein that plays a critical role in the regulation of chromatin dynamics during cell cycle progression. Multiple studies have shown that codanin‐1 is tightly linked to DNA replication and proper histone management. In particular, codanin‐1 interacts with the key histone chaperone Asf1—sequestering it in the cytoplasm—and thereby acts as a negative regulator of histone deposition on nascent DNA, a mechanism that ensures the timely assembly of chromatin during S phase."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "1"}]}, {"type": "t", "text": "\n "}]}, {"type": "t", "text": "\n "}, {"type": "p", "children": [{"type": "t", "text": "\n Codanin‐1 is also implicated in maintaining nuclear envelope integrity possibly via links to microtubule‐associated proteins; its dynamic regulation—including phosphorylation during mitosis and transcriptional control by E2F1—underscores its cell cycle–regulated function."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "3"}]}, {"type": "t", "text": " Moreover, codanin‐1 forms a cytosolic complex with C15ORF41 and Asf1, a mutually exclusive interaction that appears to “gate” the supply of new histones to the chromatin assembly machinery."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "4"}]}, {"type": "t", "text": "\n "}]}, {"type": "t", "text": "\n "}, {"type": "p", "children": [{"type": "t", "text": "\n The biological significance of codanin‐1 is further emphasized by its association with congenital dyserythropoietic anemia type I (CDA‐I). Mutations in CDAN1 disturb normal erythropoiesis by leading to distinctive erythroblast nuclear abnormalities—such as internuclear chromatin bridges, spongy heterochromatin, and defects in chromatin condensation—which manifest as ineffective red cell production."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "1"}, {"type": "fg_f", "ref": "6"}]}, {"type": "t", "text": " In some cases, additional non‐hematological features, including skeletal anomalies and even altered liver responses, have been linked to aberrant codanin‐1 function."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "8"}]}, {"type": "t", "text": "\n "}]}, {"type": "t", "text": "\n "}, {"type": "p", "children": [{"type": "t", "text": "\n In summary, CDAN1–encoded codanin‐1 is a pivotal regulator of chromatin organization during DNA replication, acting through its interactions with key histone chaperones and cell cycle regulators. Its proper function is essential for normal erythropoiesis, and its disruption forms the molecular basis for CDA‐I, underscoring both its cellular importance and clinical relevance.\n "}]}, {"type": "rg", "children": [{"type": "r", "ref": 1, "children": [{"type": "t", "text": "Orly Dgany, Nili Avidan, Jean Delaunay, et al. "}, {"type": "b", "children": [{"type": "t", "text": "Congenital dyserythropoietic anemia type I is caused by mutations in codanin-1."}]}, {"type": "t", "text": " "}, {"type": "i", "children": [{"type": "t", "text": "Am J Hum Genet (2002)"}]}, {"type": "t", "text": " DOI: "}, {"type": "a", "children": [{"type": "t", "text": "10.1086/344781"}], "href": "https://doi.org/10.1086/344781"}, {"type": "t", "text": " PMID: "}, {"type": "a", "children": [{"type": "t", "text": "12434312"}], "href": "https://pubmed.ncbi.nlm.nih.gov/12434312"}]}, {"type": "r", "ref": 2, "children": [{"type": "t", "text": "Katrine Ask, Zuzana Jasencakova, Patrice Menard, et al. 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