摘要:
Methods and compositions for producing selected non-human mammalian germ cells and gametes and for making non-human animals using the produced germ cells and gametes are provided by the present invention. Methods of generating a non-human embryo and/or animal derived from donor stem cells, methods of generating chimeric non-human animals having substantially all gametes and/or germ cells derived from the donor stem cells, methods of producing a non-human host embryo lacking functional endogenous germ cells and non-human host embryos incapable of developing endogenous gametes of the present invention are described herein.
摘要:
The present invention relates to a method for increasing the efficiency of offspring production in producing animals belonging to the family Canidae (canines) by somatic cell nuclear transfer. More specifically, relates to a method for increasing the efficiency of production of cloned canines by a method for cloning canines comprising enucleating the oocyte of a canine to prepare an enucleated oocyte, fusing a nuclear donor cell with the enucleated oocyte to prepare a nuclear transfer embryo and transferring the nuclear transfer embryo into the oviduct of a surrogate mother, wherein the nuclear donor cell is cultured in a medium containing a specific cell cycle synchronization-inducing substance such as roscovitine in the preparation thereof. The method enables to clone canines with high efficiency, and thus can contribute to the development of studies in the fields of veterinary medicine, anthropology and medical science such as the propagation of superior canines, the conservation of rare or nearly extinct canines, xenotransplantation and disease animal models.
摘要:
The present invention relates to methods and compositions for the production and derivation of pluripotent stem cells from embryos or embryo-derived cells and therapeutic uses therefor. In particular, the present invention relates to a method for producing functional stem cells or stem cell-like cells comprising the steps of culturing an embryo or embryo-derived cells in the presence of a demethylation agent and isolating functional pluripotent cells.
摘要:
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.
摘要:
The present invention is directed to various methodologies to make NT a practical procedure for animals, specifically, primates including human and non-human primates. Furthermore, the methods and molecular components provided by the present invention provide a practical means for producing embryos with desired characteristics. In a specific embodiment, the methodology of the present invention comprises introducing nuclei having desired characteristics along with one or more molecular components into an enucleated egg, thus creating a nuclear transfer construct, culturing the egg to produce a viable embryo, transferring the embryo to the oviducts of a female, and producing a cloned animal.
摘要:
The present invention concerns the use of chromosomal replacement techniques in the context of producing cloned and transgenic animals, in order to correct chromosome abnormalities or alter autosomal genotypes, and provide for novel breeding pairs by replacing the sex chromosome in animals to be cloned. Replacement of a sex chromosome, or an X or Y chromosome, will result in animals that are autosomally isogenic and sexually non-isogenic (AISN), with nullautosomally isogenicnull meaning that the paired sets of autosomes (non-sex chromosomes) in each animal are isogenic or identical. Also included in the invention are animals that are both nullautosomallynull and nullallelicallynull isogenic whereby each particular pair of chromosomes is internally isogenic or identical within a single animal as well as between animals. Such animals are particularly useful in generating a line of cloned mammals using sexual reproduction, without having to undergo nuclear transfer in order to propagate cloned animals.
摘要:
Cloned non-human mammalian nuclear transfer units, embryos and animals are provided by introducing a contact-inhibited non-cycling mammalian donor cell in the G1 state or a nucleus thereof into an enucleated oocyte from a non-human mammal of the same species as the donor to form a nuclear transfer unit, implanting the nuclear transfer unit into the uterus of a surrogate mother, permitting the nuclear transfer unit to develop into the cloned non-human mammalian embryo and allowing the embryo to come to term.
摘要:
An improved method of nuclear transfer involving the transplantation of donor cell nuclei into enucleated oocytes of a species different from the donor cell is provided. The resultant nuclear transfer units are useful for the production of isogenic embryonic stem cells, in particular human isogenic embryonic or stem cells. These embryonic or stem-like cells are useful for producing desired differentiated cells and for introduction, removal or modification, of desired genes, e.g., at specific sites of the genome of such cells by homologous recombination. These cells, which may contain a heterologous gene, are especially useful in cell transplantation therapies and for in vitro study of cell differentiation.
摘要:
Demethylation of a methylated DNA sequence in a eukaryotic cell is described, utilising a molecule that includes at least a first domain that exhibits a cytidine deaminase activity and at least a second domain that confers either a specific or non-specific DNA binding activity. The molecules of the invention are useful in somatic cell nuclear transfer and also in cancer therapy
摘要:
An improved method of nuclear transfer involving the transplantation of differentiated donor cell nuclei into enucleated oocytes of a species different from the donor cell is provided. The resultant nuclear transfer units are useful for the production of isogenic embryonic stem cells, in particular human isogenic embryonic or stem cells. These embryonic or stem-like cells are useful for producing desired differentiated cells and for introduction, removal or modification, of desired genes, e.g., at specific sites of the genome of such cells by homologous recombination. These cells, which may contain a heterologous gene, are especially useful in cell transplantation therapies and for in vitro study of cell differentiation. Also, methods for improving nuclear transfer efficiency by genetically altering donor cells to inhibit apoptosis, select for a specific cell cycle and/or enhance embryonic growth and development are provided.