{"type": "root", "children": [{"type": "p", "children": [{"type": "t", "text": "\nDEFB136 is a member of the mammalian β‐defensin family, a group of cationic peptides that serve as important innate host defense molecules. Although β‐defensins have long been recognized for their antimicrobial activities, many also exhibit pleiotropic functions that extend beyond direct microbicidal roles. Evidence from comprehensive gene repertoire studies indicates that DEFB136, like several other β‐defensins, is predominantly expressed in the male reproductive tract—especially in the epididymis and testis—underscoring its potential dual role in both safeguarding against pathogens and supporting aspects of fertility."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "1"}]}, {"type": "t", "text": ""}, {"type": "p", "children": [{"type": "t", "text": "\nThe developmental regulation and tissue specificity of DEFB136 expression suggest that it might contribute to creating an optimal microenvironment for sperm maturation by providing antimicrobial protection while modulating immune responses. This dual role is a recurring theme among β‐defensin family members, many of which are tightly regulated during sexual maturation and are critical for maintaining a balance between immune defense and reproductive function."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "1"}]}, {"type": "t", "text": ""}, {"type": "p", "children": [{"type": "t", "text": "\nIn summary, DEFB136 appears to function as both an antimicrobial peptide and an immunomodulatory factor in the male reproductive system. Its preferential expression in the reproductive tract implicates it in protecting sperm from infection while possibly influencing fertility, aligning with the concept that β‐defensins have evolved to simultaneously contribute to host defense and reproductive success."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "1"}]}]}]}]}, {"type": "rg", "children": [{"type": "r", "ref": 1, "children": [{"type": "t", "text": "Amar A Patil, Yibin Cai, Yongming Sang, et al. "}, {"type": "b", "children": [{"type": "t", "text": "Cross-species analysis of the mammalian beta-defensin gene family: presence of syntenic gene clusters and preferential expression in the male reproductive tract."}]}, {"type": "t", "text": " "}, {"type": "i", "children": [{"type": "t", "text": "Physiol Genomics (2005)"}]}, {"type": "t", "text": " DOI: "}, {"type": "a", "children": [{"type": "t", "text": "10.1152/physiolgenomics.00104.2005"}], "href": "https://doi.org/10.1152/physiolgenomics.00104.2005"}, {"type": "t", "text": " PMID: "}, {"type": "a", "children": [{"type": "t", "text": "16033865"}], "href": "https://pubmed.ncbi.nlm.nih.gov/16033865"}]}]}]}