title: Long-term (5 years) cryopreserved spermatogonia have high capacity to generate functional gametes via interspecies transplantation in salmonids.
abstract: Although sperm cryopreservation is a powerful tool widely applicable in biodiversity conservation and broodstock management, cryopreservation of teleost eggs and embryos remains challenging. In the present study, we demonstrated that spermatogonia of rainbow trout (Oncorhynchus mykiss) cryopreserved for 5 years possessed the ability to differentiate into functional eggs or sperm in the gonads of triploid recipient masu salmon (Oncorhynchus masou). After cryopreservation for 5 years in liquid nitrogen, intraperitoneally transplanted spermatogonia migrated toward, and incorporated into, the gonads of xenogeneic recipients. The transplanted spermatogonia resumed spermatogenesis and oogenesis in male and female recipients, respectively, and differentiated into sperm or eggs within the gonads of male and female recipients at 2 years posttransplantation. The differentiated sperm and eggs generated normal rainbow trout representative of donor phenotypes. Thus, cryopreservation of spermatogonia is a powerful and reliable method for long-term preservation of fish genetic resources.
authors: Department of Marine Biosciences, Tokyo University of Marine Science and Technology, Tokyo 108-8477, Japan; Biological and Genetic Resources Assessment Division, National Institute of Biological Resources, Incheon 404-708, South Korea.
authors: Seungki
authors: S
authors: Lee
authors: Department of Marine Biosciences, Tokyo University of Marine Science and Technology, Tokyo 108-8477, Japan.
authors: Yoshiko
authors: Y
authors: Iwasaki
authors: Department of Marine Biosciences, Tokyo University of Marine Science and Technology, Tokyo 108-8477, Japan. Electronic address: goro@kaiyodai.ac.jp.
authors: Goro
authors: G
authors: Yoshizaki
mesh_terms: D000818:Animals; D002454:Cell Differentiation / Q000502:physiology; D015925:Cryopreservation / Q000379:methods*; D005260:Female; D064593:Heterografts; D008297:Male; D017686:Oncorhynchus mykiss; D009865:Oocytes / Q000166:cytology*; D009866:Oogenesis / Q000502:physiology; D013091:Spermatogenesis / Q000502:physiology; D013093:Spermatogonia / Q000502:physiology*; D013094:Spermatozoa / Q000166:cytology*
keywords: Interspecies transplantation; Masu salmon; Rainbow trout; Slow freezing; Spermatogonial stem cells; Testis cryopreservation