{"type": "root", "children": [{"type": "p", "children": [{"type": "t", "text": "\nRecent studies have demonstrated that the testis‐specific serine protease TESSP‐1 plays a critical role in spermatogenesis by facilitating the progression of meiosis in male germ cells. In an in vitro organ culture experiment using an antibody against Prss41/TESSP‐1, inhibition of its function resulted in reduced germ cell numbers, an arrest of meiosis at the stage of spermatogonia, and increased apoptosis, thus emphasizing its essential role in early germ cell development."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "1"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nMolecular cloning and expression analyses have further characterized TESSP‐1 as a testis‐specific enzyme that emerges during sexual maturation. Detailed studies revealed that TESSP‐1 is expressed specifically in type B spermatogonia and early spermatocytes, with multiple alternatively spliced transcripts generated during testicular development. Its C‐terminal hydrophobic region is crucial for membrane binding through glycosylphosphatidylinositol anchoring, suggesting a regulated localization necessary for its function in mediating proper proteolytic processing during spermatogenesis."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "2"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nImmunofluorescence-based localization studies have provided additional insights into the functional dynamics of TESSP‐1 within the testis. These studies showed that TESSP‐1 localizes to the plasma membrane of spermatogonia and Sertoli cells in the basal compartment and exhibits intracellular localization, likely associated with the Golgi apparatus, in spermatocytes and spermatids located in the adluminal compartment. This differential localization implies that TESSP‐1 may participate in multiple processes during germ cell maturation, encompassing both membrane-associated events and intracellular proteolytic functions critical for successful spermatogenesis."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "3"}]}, {"type": "t", "text": "\n"}]}, {"type": "rg", "children": [{"type": "r", "ref": 1, "children": [{"type": "t", "text": "Ryoma Yoneda, Atsushi P Kimura "}, {"type": "b", "children": [{"type": "t", "text": "A testis-specific serine protease, Prss41/Tessp-1, is necessary for the progression of meiosis during murine in vitro spermatogenesis."}]}, {"type": "t", "text": " "}, {"type": "i", "children": [{"type": "t", "text": "Biochem Biophys Res Commun (2013)"}]}, {"type": "t", "text": " DOI: "}, {"type": "a", "children": [{"type": "t", "text": "10.1016/j.bbrc.2013.10.028"}], "href": "https://doi.org/10.1016/j.bbrc.2013.10.028"}, {"type": "t", "text": " PMID: "}, {"type": "a", "children": [{"type": "t", "text": "24129193"}], "href": "https://pubmed.ncbi.nlm.nih.gov/24129193"}]}, {"type": "r", "ref": 2, "children": [{"type": "t", "text": "Naoharu Takano, Hitoshi Matsui, Takayuki Takahashi "}, {"type": "b", "children": [{"type": "t", "text": "TESSP-1: a novel serine protease gene expressed in the spermatogonia and spermatocytes of adult mouse testes."}]}, {"type": "t", "text": " "}, {"type": "i", "children": [{"type": "t", "text": "Mol Reprod Dev (2005)"}]}, {"type": "t", "text": " DOI: "}, {"type": "a", "children": [{"type": "t", "text": "10.1002/mrd.20184"}], "href": "https://doi.org/10.1002/mrd.20184"}, {"type": "t", "text": " PMID: "}, {"type": "a", "children": [{"type": "t", "text": "15515062"}], "href": "https://pubmed.ncbi.nlm.nih.gov/15515062"}]}, {"type": "r", "ref": 3, "children": [{"type": "t", "text": "Naoharu Takano, Atsushi Kimura, Takayuki Takahashi "}, {"type": "b", "children": [{"type": "t", "text": "Two distinct localization patterns of testis-specific serine protease 1 (TESSP1) in the seminiferous tubules of the mouse testis."}]}, {"type": "t", "text": " "}, {"type": "i", "children": [{"type": "t", "text": "Zoolog Sci (2009)"}]}, {"type": "t", "text": " DOI: "}, {"type": "a", "children": [{"type": "t", "text": "10.2108/zsj.26.294"}], "href": "https://doi.org/10.2108/zsj.26.294"}, {"type": "t", "text": " PMID: "}, {"type": "a", "children": [{"type": "t", "text": "19798924"}], "href": "https://pubmed.ncbi.nlm.nih.gov/19798924"}]}]}]}