{"type": "root", "children": [{"type": "p", "children": [{"type": "t", "text": "\nA review of these studies reveals detailed mechanisms controlling testis‐specific gene expression during spermatogenesis—mechanisms that include promoter insulator function, nuclear matrix tethering, and repressor-mediated transcriptional pausing through factors such as TDP-43. For example, one study demonstrated that an insulator element in the SP-10 (ACRV1) gene promoter sequesters the core promoter in somatic cells by tethering it to the nuclear matrix, thereby silencing its expression, while releasing this tethering in round spermatids permits transcription."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "1"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nAdditional investigations have highlighted the role of transcription factors—such as the NF45/NF90 complex—in activating key testis-specific promoters and demonstrated that a precise change in chromatin accessibility, coupled with enhancer-core promoter compatibility, is essential for activating genes like SP-10 only during defined stages of spermatogenesis. Moreover, TDP-43 has been shown to enforce promoter pausing in early germ cells, ensuring that transcription is initiated only in the correct developmental context."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "3", "end_ref": "5"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nWhile these studies deepen our understanding of the molecular events governing spermatogenesis—including tight transcriptional control in germ versus somatic tissues and the involvement of additional factors like ACVR1B in related contexts"}, {"type": "fg", "children": [{"type": "fg_f", "ref": "6"}]}, {"type": "t", "text": "—none of the work described addresses or assigns a function to OR4M2B. Thus, based on the available literature highlighted above, the specific role of OR4M2B remains uncharacterized within these regulatory networks.\n"}]}, {"type": "rg", "children": [{"type": "r", "ref": 1, "children": [{"type": "t", "text": "Mayuresh M Abhyankar, Craig Urekar, Prabhakara P Reddi "}, {"type": "b", "children": [{"type": "t", "text": "A novel CpG-free vertebrate insulator silences the testis-specific SP-10 gene in somatic tissues: role for TDP-43 in insulator function."}]}, {"type": "t", "text": " "}, {"type": "i", "children": [{"type": "t", "text": "J Biol Chem (2007)"}]}, {"type": "t", "text": " DOI: "}, {"type": "a", "children": [{"type": "t", "text": "10.1074/jbc.M705811200"}], "href": "https://doi.org/10.1074/jbc.M705811200"}, {"type": "t", "text": " PMID: "}, {"type": "a", "children": [{"type": "t", "text": "17932037"}], "href": "https://pubmed.ncbi.nlm.nih.gov/17932037"}]}, {"type": "r", "ref": 2, "children": [{"type": "t", "text": "Prabhakara P Reddi "}, {"type": "b", "children": [{"type": "t", "text": "Transcriptional regulation of spatiotemporal gene expression within the seminiferous epithelium: Mouse Acrv1 gene as a model."}]}, {"type": "t", "text": " "}, {"type": "i", "children": [{"type": "t", "text": "Andrology (2023)"}]}, {"type": "t", "text": " DOI: "}, {"type": "a", "children": [{"type": "t", "text": "10.1111/andr.13410"}], "href": "https://doi.org/10.1111/andr.13410"}, {"type": "t", "text": " PMID: "}, {"type": "a", "children": [{"type": "t", "text": "36793255"}], "href": "https://pubmed.ncbi.nlm.nih.gov/36793255"}]}, {"type": "r", "ref": 3, "children": [{"type": "t", "text": "Sandeep A Ranpura, Umesh Deshmukh, Prabhakara P Reddi "}, {"type": "b", "children": [{"type": "t", "text": "NF45 and NF90 in murine seminiferous epithelium: potential role in SP-10 gene transcription."}]}, {"type": "t", "text": " "}, {"type": "i", "children": [{"type": "t", "text": "J Androl (2008)"}]}, {"type": "t", "text": " DOI: "}, {"type": "a", "children": [{"type": "t", "text": "10.2164/jandrol.107.003756"}], "href": "https://doi.org/10.2164/jandrol.107.003756"}, {"type": "t", "text": " PMID: "}, {"type": "a", "children": [{"type": "t", "text": "17942973"}], "href": "https://pubmed.ncbi.nlm.nih.gov/17942973"}]}, {"type": "r", "ref": 4, "children": [{"type": "t", "text": "Avin S Lalmansingh, Craig J Urekar, Prabhakara P Reddi "}, {"type": "b", "children": [{"type": "t", "text": "TDP-43 is a transcriptional repressor: the testis-specific mouse acrv1 gene is a TDP-43 target in vivo."}]}, {"type": "t", "text": " "}, {"type": "i", "children": [{"type": "t", "text": "J Biol Chem (2011)"}]}, {"type": "t", "text": " DOI: "}, {"type": "a", "children": [{"type": "t", "text": "10.1074/jbc.M110.166587"}], "href": "https://doi.org/10.1074/jbc.M110.166587"}, {"type": "t", "text": " PMID: "}, {"type": "a", "children": [{"type": "t", "text": "21252238"}], "href": "https://pubmed.ncbi.nlm.nih.gov/21252238"}]}, {"type": "r", "ref": 5, "children": [{"type": "t", "text": "Craig Urekar, Kshitish K Acharya, Preeti Chhabra, et al. "}, {"type": "b", "children": [{"type": "t", "text": "A 50-bp enhancer of the mouse acrosomal vesicle protein 1 gene activates round spermatid-specific transcription in vivo†."}]}, {"type": "t", "text": " "}, {"type": "i", "children": [{"type": "t", "text": "Biol Reprod (2019)"}]}, {"type": "t", "text": " DOI: "}, {"type": "a", "children": [{"type": "t", "text": "10.1093/biolre/ioz115"}], "href": "https://doi.org/10.1093/biolre/ioz115"}, {"type": "t", "text": " PMID: "}, {"type": "a", "children": [{"type": "t", "text": "31290539"}], "href": "https://pubmed.ncbi.nlm.nih.gov/31290539"}]}, {"type": "r", "ref": 6, "children": [{"type": "t", "text": "A Tang, Q Yan, L Sun, et al. "}, {"type": "b", "children": [{"type": "t", "text": "Developmental expression of ACRV1 in humans and mice."}]}, {"type": "t", "text": " "}, {"type": "i", "children": [{"type": "t", "text": "Andrologia (2012)"}]}, {"type": "t", "text": " DOI: "}, {"type": "a", "children": [{"type": "t", "text": "10.1111/j.1439-0272.2010.01095.x"}], "href": "https://doi.org/10.1111/j.1439-0272.2010.01095.x"}, {"type": "t", "text": " PMID: "}, {"type": "a", "children": [{"type": "t", "text": "21488928"}], "href": "https://pubmed.ncbi.nlm.nih.gov/21488928"}]}, {"type": "r", "ref": 7, "children": [{"type": "t", "text": "Wanglong Qiu, Sophia M Tang, Sohyae Lee, et al. 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