title: Lack of acrosome formation in mice lacking a Golgi protein, GOPC.
abstract: The acrosome is a unique organelle that plays an important role at the site of sperm-zona pellucida binding during the fertilization process, and is lost in globozoospermia, an inherited infertility syndrome in humans. Although the acrosome is known to be derived from the Golgi apparatus, molecular mechanisms underlying acrosome formation are largely unknown. Here we show that Golgi-associated PDZ- and coiled-coil motif-containing protein (GOPC), a recently identified Golgi-associated protein, is predominantly localized at the trans-Golgi region in round spermatids, and male mice in which GOPC has been disrupted are infertile with globozoospermia. The primary defect was the fragmentation of acrosomes in early round spermatids, and abnormal vesicles that failed to fuse to developing acrosomes were apparent. In later stages, nuclear malformation and an abnormal arrangement of mitochondria, which are also characteristic features of human globozoospermia, were observed. Interestingly, intracytoplasmic sperm injection (ICSI) of such malformed sperm into oocytes resulted in cleavage into blastocysts only when injected oocytes were activated. Thus, GOPC provides important clues to understanding the mechanisms underlying spermatogenesis, and the GOPC-deficient mouse may be a unique and valuable model for human globozoospermia.
authors.affiliation: Department of Cell Biology, Japanese Foundation for Cancer Research (JFCR) Cancer Institute, 1-37-1 Kami-Ikebukuro, Toshima-Ku, Tokyo 170-8455, Japan.
authors.forename: Ryoji
authors.initials: R
authors.lastname: Yao
authors.forename: Chizuru
authors.initials: C
authors.lastname: Ito
authors.forename: Yasuko
authors.initials: Y
authors.lastname: Natsume
authors.forename: Yoshinobu
authors.initials: Y
authors.lastname: Sugitani
authors.forename: Hitomi
authors.initials: H
authors.lastname: Yamanaka
authors.forename: Shoji
authors.initials: S
authors.lastname: Kuretake
authors.forename: Kaoru
authors.initials: K
authors.lastname: Yanagida
authors.forename: Akira
authors.initials: A
authors.lastname: Sato
authors.forename: Kiyotaka
authors.initials: K
authors.lastname: Toshimori
authors.forename: Tetsuo
authors.initials: T
authors.lastname: Noda
mesh_terms: D000177:Acrosome / Q000502:physiology* / Q000648:ultrastructure; D020101:Acrosome Reaction; D048868:Adaptor Proteins, Signal Transducing; D000818:Animals; D002352:Carrier Proteins / Q000235:genetics / Q000502:physiology*; D005260:Female; D018507:Gene Expression Regulation, Developmental; D015698:Genomic Library; D006056:Golgi Apparatus / Q000502:physiology* / Q000648:ultrastructure; D000077614:Golgi Matrix Proteins; D047908:Intracellular Signaling Peptides and Proteins; D008297:Male; D051379:Mice; D018345:Mice, Knockout; D016253:Microscopy, Immunoelectron; D020133:Reverse Transcriptase Polymerase Chain Reaction; D013737:Testis / Q000166:cytology; D015044:Zona Pellucida / Q000502:physiology
chemical_list: D048868:Adaptor Proteins, Signal Transducing; D002352:Carrier Proteins; D000077614:Golgi Matrix Proteins; C435484:Gopc protein, mouse; D047908:Intracellular Signaling Peptides and Proteins