{"type": "root", "children": [{"type": "p", "children": [{"type": "t", "text": "\n CECR7 is a chimeric transcription unit located in the cat eye syndrome (CES) critical region on chromosome 22q and appears to have arisen through the integration of multiple duplicons in pericentromeric DNA."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "1"}]}, {"type": "t", "text": " Expression of CECR7 has been detected in human and gorilla fibroblasts, although its expression in orangutans was not apparent, suggesting that its activation occurred early in primate evolution but may be subject to species‐specific silencing (1). In the context of developmental abnormalities, analyses employing fluorescence in situ hybridization (FISH) in prenatal samples have demonstrated that CECR7 is not present on certain marker chromosomes derived from 22q11, implying that rearrangements affecting dosage of the region may spare CECR7 or alter its regulation."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "3"}]}, {"type": "t", "text": "\n "}]}, {"type": "t", "text": "\n "}, {"type": "p", "children": [{"type": "t", "text": "\n In cancer studies, differential methylation patterns affecting the first exon of CECR7 have been identified in mucosa adjacent to colorectal cancer compared to normal tissue, indicating that epigenetic regulation of this gene may be involved in tumorigenesis."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "5"}]}, {"type": "t", "text": " Moreover, CECR7 has emerged as a component of competing endogenous RNA (ceRNA) networks in hepatocellular carcinoma and pancreatic cancer, where its interaction with microRNAs (notably hsa‐miR‐429) appears linked to the regulation of key immune and growth‐modulatory factors such as CTLA4. The inclusion of CECR7 in these networks and its significant association with overall survival in hepatocellular carcinoma patients suggest that it may serve as a prognostic biomarker and participate in the modulation of oncogenic pathways."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "6"}]}, {"type": "t", "text": "\n "}]}, {"type": "t", "text": "\n "}, {"type": "p", "children": [{"type": "t", "text": "\n Although its precise biological function remains to be fully elucidated, the available evidence points to a role for CECR7 in both developmental disorders, as evidenced by its location within the CES region, and in cancer, through its involvement in regulatory RNA networks. Ongoing studies into its epigenetic modifications and interactions with microRNAs may help further clarify the mechanisms by which CECR7 influences gene expression in both normal development and disease.\n "}]}, {"type": "rg", "children": [{"type": "r", "ref": 1, "children": [{"type": "t", "text": "Lindsay Bridgland, Tim K Footz, Melanie D Kardel, et al. 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