54 results about "Spermatogonium" patented technology

In order to examine whether or not a germ cell derived from a donor fish, which has been transplanted into a recipient fish of a different species by a surrogate fish technique, grows or matures in the gonad of the recipient fish, it is necessary to use, as an indicator, a trait that is specifically expressed in the germ cell and can be used to distinguish the recipient fish from the donor fish. Vasa gene, which is a germ cell-specific gene, is specific to a primordial germ cell and a spermatogonium / an oogonium, and it is not expressed in a somatic cell. In the present invention, the Vasa gene sequences of a tuna, a chub mackerel, a spotted mackerel, an eastern little tuna, and a drumfish are determined, and the expression of such gene is used as a marker for a germ cell. In addition, according to the present invention, it is possible to specifically detect only a tuna Vasa gene in Vasa gene sequences that are highly conserved in fishes, without sequencing. Thus, a tuna-derived germ cell can be reliably and simply identified in the gonad of the recipient fish. As a result, the growth or breeding of tuna can be carried out with good efficiency. Moreover, utilizing the aforementioned findings, even in a case in which not only a tuna but also another Perciformes fish is used as a donor, a germ cell derived from the donor fish can be efficiently detected from the gonad of a recipient fish of a different species.

Compositions and methods are provided for the reproducible derivation of germ cells and oocytes and spermatogonia therefrom. Also provide are methods of use of the same in reproductive and therapeutic cloning protocols.

A spermatogonial stem cell line that is derived from testes of rats characterized by a desirable genetic background can serve as a source for cells to transplant into male-sterile recipient animals that are immuno-compatible with the spermatogonial line. Rat cells thus transplanted readily develop into fertilization-competent, haploid male gametes, with little or no endogenous sperm competition generated by the testes of the male-sterile recipient. This approach, constituting the first vector system for the use of rat spermatogonial lines from in vitro culture in generating mutant rats on a desired genetic background, effects maximal germline transmission of donor haplotypes from the transplanted spermatogonial cells.

A male sterile mouse model with high genetic stability and phynotype stability is disclosed. Its preparing process features that the gene Kif18a is removed from genome or the exogenous gene is inserted in the gene Kif18a to make it be deactivated. Said model can be used to research the generation and development of sperm, the gene associated with the development of sperm, the transplantation of stem spermatogonium, reconfiguration of sperm, the migration and differentiation of reproduction cells, and the medicine for contraception.