{"type": "root", "children": [{"type": "p", "children": [{"type": "t", "text": "\n CATSPERD is emerging as an important component in the regulation of sperm function and male fertility. Studies in human spermatozoa have established that the CatSper channel complex is essential for mediating progesterone‐induced Ca²⁺ influx, an event critical for sperm hyperactivation and successful fertilization. Although direct functional assessments of CATSPERD were not performed in these studies, the near absence of CatSper currents correlated with fertilization failure in vitro, implying that proper assembly and function of the entire CatSper complex—including all of its subunits such as CATSPERD—is vital for sperm functionality."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "1"}]}, {"type": "t", "text": "\n "}]}, {"type": "t", "text": "\n "}, {"type": "p", "children": [{"type": "t", "text": "\n Complementary transcriptomic analyses during gametogenesis have revealed that CATSPERD exhibits dynamic, stage-specific expression during spermiogenesis, which supports a role in the developmental regulation of sperm maturation."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "2"}]}, {"type": "t", "text": "\n "}]}, {"type": "t", "text": "\n "}, {"type": "p", "children": [{"type": "t", "text": "\n Interestingly, altered expression patterns of CATSPERD are not limited to reproductive tissues. In oral squamous cell carcinoma, for example, CATSPERD is among a group of genes whose expression is markedly suppressed in tumor tissues compared to benign tissues, suggesting that its regulation may provide diagnostic value as a biomarker for malignancy."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "3"}]}, {"type": "t", "text": "\n "}]}, {"type": "t", "text": "\n "}, {"type": "p", "children": [{"type": "t", "text": "\n Finally, research in animal reproductive models, such as studies on fox hybrids, has demonstrated that downregulation of CATSPERD—together with other key genes involved in mitosis and meiosis—is associated with spermatogenic arrest and resultant male infertility. These findings further underscore the essential role of CATSPERD in facilitating normal sperm production."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "4"}]}, {"type": "t", "text": "\n "}]}, {"type": "t", "text": "\n "}, {"type": "p", "children": [{"type": "t", "text": "\n In summary, CATSPERD appears to be integral to the formation and function of the CatSper channel complex, with a pivotal role in both sperm maturation and fertilization. Its dynamic expression during spermiogenesis and association with defective spermatogenesis in animal models highlight its importance in male fertility. Moreover, the altered expression of CATSPERD in cancerous tissues opens avenues for its use as a biomarker in oncology, as well as underscoring its potential as a target for non-hormonal male contraception.\n "}]}, {"type": "rg", "children": [{"type": "r", "ref": 1, "children": [{"type": "t", "text": "Hannah L Williams, Steven Mansell, Wardah Alasmari, et al. "}, {"type": "b", "children": [{"type": "t", "text": "Specific loss of CatSper function is sufficient to compromise fertilizing capacity of human spermatozoa."}]}, {"type": "t", "text": " "}, {"type": "i", "children": [{"type": "t", "text": "Hum Reprod (2015)"}]}, {"type": "t", "text": " DOI: "}, {"type": "a", "children": [{"type": "t", "text": "10.1093/humrep/dev243"}], "href": "https://doi.org/10.1093/humrep/dev243"}, {"type": "t", "text": " PMID: "}, {"type": "a", "children": [{"type": "t", "text": "26453676"}], "href": "https://pubmed.ncbi.nlm.nih.gov/26453676"}]}, {"type": "r", "ref": 2, "children": [{"type": "t", "text": "Mary C Wallingford, Rachel Filkins, Danielle Adams, et al. 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"}, {"type": "b", "children": [{"type": "t", "text": "Neoexpression of "}, {"type": "a", "children": [{"type": "t", "text": "i"}], "href": "i"}, {"type": "t", "text": "JUNO"}, {"type": "a", "children": [{"type": "t", "text": "/i"}], "href": "/i"}, {"type": "t", "text": " in Oral Tumors Is Accompanied with the Complete Suppression of Four Other Genes and Suggests the Application of New Biomarker Tools."}]}, {"type": "t", "text": " "}, {"type": "i", "children": [{"type": "t", "text": "J Pers Med (2022)"}]}, {"type": "t", "text": " DOI: "}, {"type": "a", "children": [{"type": "t", "text": "10.3390/jpm12030494"}], "href": "https://doi.org/10.3390/jpm12030494"}, {"type": "t", "text": " PMID: "}, {"type": "a", "children": [{"type": "t", "text": "35330493"}], "href": "https://pubmed.ncbi.nlm.nih.gov/35330493"}]}, {"type": "r", "ref": 4, "children": [{"type": "t", "text": "Tong'ao Yang, Huamiao Liu, Yahan Yang, et al. 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