{"type": "root", "children": [{"type": "p", "children": [{"type": "t", "text": "\nHOOK1 is a microtubule‐binding protein that plays a critical role in male germ cell development. In mice, loss‐of-function mutations affecting HOOK1 lead to drastic abnormalities in sperm morphology, including malformed heads and flagellar defects arising from disorganized microtubular structures such as the manchette. Such studies demonstrate that HOOK1 is integral to linking microtubular elements to the developing sperm cell’s architecture, implicating it as a candidate for human male infertility associated with teratozoospermia or decapitation defects."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "1", "end_ref": "3"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nIn addition to its role in spermatogenesis, HOOK1 functions as an adaptor protein in intracellular transport. It interacts with key components such as the cytoplasmic dynein motor and dynactin to promote efficient minus end-directed movement of organelles and vesicles along microtubules. Experiments using optogenetic recruitment and single-molecule assays reveal that HOOK1, as well as its homologs, activates dynein more effectively than other known dynein activators, and its interaction with proteins like Ankyrin G further suggests a broader role in organizing and positioning membrane-associated complexes."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "4"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nBeyond its established functions in cellular transport and sperm development, altered HOOK1 expression is emerging as a factor in other pathological contexts. For instance, variations in HOOK1 expression have been reported in ovarian tumors, hinting at a potential involvement in cancer stem cell regulation and tumor initiation. Moreover, studies involving the cryopreservation and assisted reproductive use of sperm from HOOK1-deficient models underscore the protein’s importance in maintaining sperm integrity during stress, thereby linking its proper function to both reproductive success and cellular homeostasis."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "6"}]}, {"type": "t", "text": "\n"}]}, {"type": "rg", "children": [{"type": "r", "ref": 1, "children": [{"type": "t", "text": "Irene Mendoza-Lujambio, Peter Burfeind, Christa Dixkens, et al. "}, {"type": "b", "children": [{"type": "t", "text": "The Hook1 gene is non-functional in the abnormal spermatozoon head shape (azh) mutant mouse."}]}, {"type": "t", "text": " "}, {"type": "i", "children": [{"type": "t", "text": "Hum Mol Genet (2002)"}]}, {"type": "t", "text": " DOI: "}, {"type": "a", "children": [{"type": "t", "text": "10.1093/hmg/11.14.1647"}], "href": "https://doi.org/10.1093/hmg/11.14.1647"}, {"type": "t", "text": " PMID: "}, {"type": "a", "children": [{"type": "t", "text": "12075009"}], "href": "https://pubmed.ncbi.nlm.nih.gov/12075009"}]}, {"type": "r", "ref": 2, "children": [{"type": "t", "text": "Thomas Schwarz, Barbara Prieler, Johannes A Schmid, et al. "}, {"type": "b", "children": [{"type": "t", "text": "Ccdc181 is a microtubule-binding protein that interacts with Hook1 in haploid male germ cells and localizes to the sperm tail and motile cilia."}]}, {"type": "t", "text": " "}, {"type": "i", "children": [{"type": "t", "text": "Eur J Cell Biol (2017)"}]}, {"type": "t", "text": " DOI: "}, {"type": "a", "children": [{"type": "t", "text": "10.1016/j.ejcb.2017.02.003"}], "href": "https://doi.org/10.1016/j.ejcb.2017.02.003"}, {"type": "t", "text": " PMID: "}, {"type": "a", "children": [{"type": "t", "text": "28283191"}], "href": "https://pubmed.ncbi.nlm.nih.gov/28283191"}]}, {"type": "r", "ref": 3, "children": [{"type": "t", "text": "Yasuhiro Yamauchi, Monika A Ward "}, {"type": "b", "children": [{"type": "t", "text": "Preservation of ejaculated mouse spermatozoa from fertile C57BL/6 and infertile Hook1/Hook1 mice collected from the uteri of mated females."}]}, {"type": "t", "text": " "}, {"type": "i", "children": [{"type": "t", "text": "Biol Reprod (2007)"}]}, {"type": "t", "text": " DOI: "}, {"type": "a", "children": [{"type": "t", "text": "10.1095/biolreprod.106.059881"}], "href": "https://doi.org/10.1095/biolreprod.106.059881"}, {"type": "t", "text": " PMID: "}, {"type": "a", "children": [{"type": "t", "text": "17314312"}], "href": "https://pubmed.ncbi.nlm.nih.gov/17314312"}]}, {"type": "r", "ref": 4, "children": [{"type": "t", "text": "Mara A Olenick, Mariko Tokito, Malgorzata Boczkowska, et al. "}, {"type": "b", "children": [{"type": "t", "text": "Hook Adaptors Induce Unidirectional Processive Motility by Enhancing the Dynein-Dynactin Interaction."}]}, {"type": "t", "text": " "}, {"type": "i", "children": [{"type": "t", "text": "J Biol Chem (2016)"}]}, {"type": "t", "text": " DOI: "}, {"type": "a", "children": [{"type": "t", "text": "10.1074/jbc.M116.738211"}], "href": "https://doi.org/10.1074/jbc.M116.738211"}, {"type": "t", "text": " PMID: "}, {"type": "a", "children": [{"type": "t", "text": "27365401"}], "href": "https://pubmed.ncbi.nlm.nih.gov/27365401"}]}, {"type": "r", "ref": 5, "children": [{"type": "t", "text": "Jill M Weimer, Subrata Chattopadhyay, Andrew W Custer, et al. "}, {"type": "b", "children": [{"type": "t", "text": "Elevation of Hook1 in a disease model of Batten disease does not affect a novel interaction between Ankyrin G and Hook1."}]}, {"type": "t", "text": " "}, {"type": "i", "children": [{"type": "t", "text": "Biochem Biophys Res Commun (2005)"}]}, {"type": "t", "text": " DOI: "}, {"type": "a", "children": [{"type": "t", "text": "10.1016/j.bbrc.2005.03.103"}], "href": "https://doi.org/10.1016/j.bbrc.2005.03.103"}, {"type": "t", "text": " PMID: "}, {"type": "a", "children": [{"type": "t", "text": "15823567"}], "href": "https://pubmed.ncbi.nlm.nih.gov/15823567"}]}, {"type": "r", "ref": 6, "children": [{"type": "t", "text": "Elisa Suárez-Martínez, Sander R Piersma, Thang V Pham, et al. "}, {"type": "b", "children": [{"type": "t", "text": "Protein homeostasis maintained by HOOK1 levels promotes the tumorigenic and stemness properties of ovarian cancer cells through reticulum stress and autophagy."}]}, {"type": "t", "text": " "}, {"type": "i", "children": [{"type": "t", "text": "J Exp Clin Cancer Res (2024)"}]}, {"type": "t", "text": " DOI: "}, {"type": "a", "children": [{"type": "t", "text": "10.1186/s13046-024-03071-2"}], "href": "https://doi.org/10.1186/s13046-024-03071-2"}, {"type": "t", "text": " PMID: "}, {"type": "a", "children": [{"type": "t", "text": "38807192"}], "href": "https://pubmed.ncbi.nlm.nih.gov/38807192"}]}]}]}