{"type": "root", "children": [{"type": "p", "children": [{"type": "t", "text": "\nAlthough the query requested a summary of CTAGE4, none of the provided abstracts mention or address CTAGE4. Instead, the studies describe the functions of meiosis‐specific HORMA-domain proteins—primarily HORMAD1 and HORMAD2—in the regulation of meiotic chromosome behavior. In the first study, these proteins are shown to localize preferentially along unsynapsed chromosome axes, with their removal from synapsed regions correlating with synaptonemal complex (SC) formation. This regulation appears to be critical for proper homologue alignment and crossover formation during meiosis, and it is suggested that factors such as the ATPase TRIP13 help coordinate the mutually exclusive distribution of HORMADs and SC components."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "1"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nSubsequent investigations focused on HORMAD2 have revealed that its association with unsynapsed chromosome axes is essential for recruiting the checkpoint kinase ATR specifically to these regions. This targeted ATR accumulation is a key aspect of a surveillance mechanism that monitors asynapsis and helps eliminate aberrant oocytes. For instance, in mouse oocytes lacking programmed double-strand breaks (as in Spo11 mutants) or defective in DSB repair, HORMAD2-dependent ATR recruitment correlates with the formation of ATR-enriched chromatin structures that serve as quality control checkpoints during meiotic prophase."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "2"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nFurther mechanistic insights demonstrate that the dynamic behavior of HORMAD2 is finely controlled at the molecular level. In particular, analyses have identified that the N-terminal domain of HORMAD2 is critical for its timely dissociation from synapsed chromosomes, underscoring a precise regulatory mechanism that ensures the proper progression of meiotic events and checkpoint signaling. Overall, the compiled studies elucidate how HORMA-domain proteins, rather than CTAGE4, orchestrate essential meiotic processes by controlling chromosome synapsis and activating surveillance mechanisms."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "4"}]}, {"type": "t", "text": "\n"}]}, {"type": "rg", "children": [{"type": "r", "ref": 1, "children": [{"type": "t", "text": "Lukasz Wojtasz, Katrin Daniel, Ignasi Roig, et al. "}, {"type": "b", "children": [{"type": "t", "text": "Mouse HORMAD1 and HORMAD2, two conserved meiotic chromosomal proteins, are depleted from synapsed chromosome axes with the help of TRIP13 AAA-ATPase."}]}, {"type": "t", "text": " "}, {"type": "i", "children": [{"type": "t", "text": "PLoS Genet (2009)"}]}, {"type": "t", "text": " DOI: "}, {"type": "a", "children": [{"type": "t", "text": "10.1371/journal.pgen.1000702"}], "href": "https://doi.org/10.1371/journal.pgen.1000702"}, {"type": "t", "text": " PMID: "}, {"type": "a", "children": [{"type": "t", "text": "19851446"}], "href": "https://pubmed.ncbi.nlm.nih.gov/19851446"}]}, {"type": "r", "ref": 2, "children": [{"type": "t", "text": "Lukasz Wojtasz, Jeffrey M Cloutier, Marek Baumann, et al. "}, {"type": "b", "children": [{"type": "t", "text": "Meiotic DNA double-strand breaks and chromosome asynapsis in mice are monitored by distinct HORMAD2-independent and -dependent mechanisms."}]}, {"type": "t", "text": " "}, {"type": "i", "children": [{"type": "t", "text": "Genes Dev (2012)"}]}, {"type": "t", "text": " DOI: "}, {"type": "a", "children": [{"type": "t", "text": "10.1101/gad.187559.112"}], "href": "https://doi.org/10.1101/gad.187559.112"}, {"type": "t", "text": " PMID: "}, {"type": "a", "children": [{"type": "t", "text": "22549958"}], "href": "https://pubmed.ncbi.nlm.nih.gov/22549958"}]}, {"type": "r", "ref": 3, "children": [{"type": "t", "text": "Hiroshi Kogo, Makiko Tsutsumi, Hidehito Inagaki, et al. "}, {"type": "b", "children": [{"type": "t", "text": "HORMAD2 is essential for synapsis surveillance during meiotic prophase via the recruitment of ATR activity."}]}, {"type": "t", "text": " "}, {"type": "i", "children": [{"type": "t", "text": "Genes Cells (2012)"}]}, {"type": "t", "text": " DOI: "}, {"type": "a", "children": [{"type": "t", "text": "10.1111/gtc.12005"}], "href": "https://doi.org/10.1111/gtc.12005"}, {"type": "t", "text": " PMID: "}, {"type": "a", "children": [{"type": "t", "text": "23039116"}], "href": "https://pubmed.ncbi.nlm.nih.gov/23039116"}]}, {"type": "r", "ref": 4, "children": [{"type": "t", "text": "Isabella G Cossu, N Adrian Leu, Yongjuan Guan, et al. "}, {"type": "b", "children": [{"type": "t", "text": "The N-terminal modification of HORMAD2 causes its ectopic persistence on synapsed chromosomes without meiotic blockade."}]}, {"type": "t", "text": " "}, {"type": "i", "children": [{"type": "t", "text": "Reproduction (2024)"}]}, {"type": "t", "text": " DOI: "}, {"type": "a", "children": [{"type": "t", "text": "10.1530/REP-23-0330"}], "href": "https://doi.org/10.1530/REP-23-0330"}, {"type": "t", "text": " PMID: "}, {"type": "a", "children": [{"type": "t", "text": "38401263"}], "href": "https://pubmed.ncbi.nlm.nih.gov/38401263"}]}]}]}