{"type": "root", "children": [{"type": "p", "children": [{"type": "t", "text": "\n Lysozyme‐like protein 1 (LYZL1) is a member of the c‐type lysozyme superfamily that is predominantly expressed in the male reproductive tract and has been implicated in both innate immunity and sperm function. Structural studies of the sperm‐associated counterpart (SLLP1) have revealed that, although it lacks key catalytic residues found in classical lysozymes, its conserved surface “fingerprint” appears tailored for interaction with an oolemmal receptor, suggesting a direct role in sperm–egg binding and fertilization."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "1"}]}, {"type": "t", "text": " In support of a broader functional repertoire, expression analyses in fish have shown that GLP2 stimulation significantly upregulates Lyzl‐1 along with other antimicrobial effectors in the intestine, implying that LYZL1 may also contribute to a local antimicrobial defense."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "2"}]}, {"type": "t", "text": " In human reproductive studies, proteomic comparisons in globozoospermic sperm (associated with Dpy19l2 deletions) have identified altered expression of LYZL1, further linking its normal expression to proper acrosomal functions and efficient sperm–egg interaction"}, {"type": "fg", "children": [{"type": "fg_f", "ref": "3"}]}, {"type": "t", "text": "; similar in vivo immunization studies in rats demonstrated that neutralizing LYZL1 leads to reduced sperm count, impaired acrosome reaction, and diminished fertility, underscoring its importance in male reproductive capacity."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "4"}]}, {"type": "t", "text": " In addition, while studies of mouse lysozyme‐like gene families have noted that the precise functions of LYZL1 (and its paralog LYZL6) remain to be fully elucidated"}, {"type": "fg", "children": [{"type": "fg_f", "ref": "5"}]}, {"type": "t", "text": ", further characterization in rat models has revealed that recombinant LYZL1 exhibits peptidoglycan binding, muramidase, and antibacterial activities—likely through bacterial membrane disruption—thereby suggesting a dual role as an antimicrobial effector within the reproductive tract."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "6"}]}, {"type": "t", "text": " Moreover, transcriptomic analyses in ovarian cancer have identified LYZL1 among a set of overlapping genes altered in chemoresistant phenotypes, which may reflect broader roles in cellular homeostasis beyond fertilization"}, {"type": "fg", "children": [{"type": "fg_f", "ref": "7"}]}, {"type": "t", "text": ", while investigations into genetic variation in metabolic disease contexts indicate that rare coding variants in LYZL1 are unlikely to contribute significantly to vascular calcification in type 2 diabetes."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "8"}]}, {"type": "t", "text": " Finally, conservation of LYZL1 expression in germ cells and its localization to key sperm structures (as further demonstrated in rat studies showing expression in primary spermatocytes, spermatids, and on the sperm tail) support a model in which LYZL1 plays a dual and evolutionarily conserved role in ensuring both proper sperm maturation/fertilization and localized antimicrobial defense."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "9"}]}, {"type": "t", "text": "\n "}]}, {"type": "rg", "children": [{"type": "r", "ref": 1, "children": [{"type": "t", "text": "H Zheng, A Mandal, I A Shumilin, et al. 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