16 results about "Egg cell" patented technology

Methods for improving parthenogenesis efficiency by DWT1 and BABY BOOM transcription factors in plants are provided. A rice embryo trigger transcription factor BABY BOOM1 can initiate embryogenesis when expressed in the unfertilized egg cell through a process called parthenogenesis (Khanday et al., 2019. Nature 565: 91-95). The parthenogenesis efficiency by BABY BBOM1 itself is 10-29%. This invention describes methods of high frequency of parthenogenesis by simultaneous expression of BABY BOOM and DWT1 transcription factors. When BABY BOOM1 and DWT1 are expressed together through egg cell-specific promoters, parthenogenesis efficiencies of up to 90% are achieved. These high parthenogenesis efficiencies are a prerequisite for field applications of synthetic apomixis in crop plants.

This invention discloses a two-branch oocyte target detection method and system for motion blur. Addressing the motion blur problem caused by equipment vibration and oocyte micro-movement during oocyte retrieval, this invention constructs an end-to-end detection model comprising a clear branch and a blurred branch. Each branch includes a lightweight feature recovery network, a multi-band feature fusion module, a frequency structure enhancement module, and an oocyte target detection network. During the training phase, feature domain deblurring loss, feature consistency self-supervised loss, and oocyte detection loss are used for joint training of the two branches, with the clear branch's features supervising the learning of robust feature representations in the blurred branch. During the inference phase, only the blurred branch outputs the detection results. The multi-band feature fusion module repairs degraded features such as contours, edges, and textures through frequency domain decomposition and targeted enhancement, while the frequency structure enhancement module compensates for missing structural information through a cross-attention mechanism. This invention effectively solves the problem of decreased detection accuracy caused by motion blur.

The invention discloses a litopenaeus vannamei egg membrane outer layer protein VMO1 and an application thereof in egg entering of a prawn foreign protein. The amino acid sequence of the egg membrane outer layer protein VMO1 of the litopenaeus vannamei is as shown in SEQ ID NO. 2. The litopenaeus vannamei vitelline membrane outer layer protein gene LvVMO1 is cloned from litopenaeus vannamei for the first time, and experiments prove that the litopenaeus vannamei vitelline membrane outer layer protein gene LvVMO1 is generated in the hepatopancreas tissue of the litopenaeus vannamei and enters eggs through a hemolymph way. A VMO1-EGFP in-vivo tracing test further shows that VMO1 is generated in hepatopancreas of the litopenaeus vannamei, enters the ovary through hemolymph, can carry foreign proteins such as EGFP, is transferred from an abdominal injection site and is enriched in the ovary. The invention provides an effective technical means for introducing a gene editing system into litopenaeus vannamei egg cells by using foreign proteins to realize genetic improvement and other applications of litopenaeus vannamei, and has wide application prospects and great economic values.

Provided is a method for constructing a humanized FKBP8 gene knock-in animal model, comprising: (1) constructing a targeting vector for humanized FKBP8 gene knock-in, and transfecting the targeting vector, Cas9, and sgRNA into fertilized eggs of donor animals; (2) transplanting surviving fertilized egg cells into the oviduct of pseudopregnant animals to obtain F0 generation animals and identifying the F0 generation animals, wherein animals showing positive homologous recombination are chimeric animals; and (3) mating the chimeric animals with wild-type animals to obtain F1 generation animals and performing identification, wherein F1 animals showing positive homologous recombination are humanized FKBP8 knock-in animals. In the construction method, an FKBP8 gene sequence in a donor animal is substituted by a human FKBP8 gene sequence, so as to achieve the purpose of humanizing the FKBP8 gene in the donor animal, thus successfully establishing a humanized FKBP8 gene knock-in animal model, so that screening for drugs targeting the FKBP8 gene and a product thereof in the animal model, or studying the pathogenesis and treatment mechanisms of the FKBP8 gene and the product thereof in related clinical diseases can be realized.

The invention relates to a mitochondrial delivery system and a preparation method and application thereof. According to the mitochondrial delivery system, safe and efficient cell entry of active mitochondria can be achieved, the mitochondrial delivery system has appropriate particle size and surface potential, toxicity to cells is avoided while the entrapment rate of the mitochondria is effectively improved and the electrochemical stability and biological activity of a mitochondrial membrane are guaranteed, and the mitochondrial cell entry efficiency is remarkably improved. The mitochondrial delivery system not only can transplant active mitochondria into common cells to repair cell damage, but also can transplant the active mitochondria into egg cells to play a role across a zona pellucida and a plasma membrane barrier. The mitochondrial delivery system can be used for treating mitochondrial diseases related to mitochondrial dysfunction, especially infertility caused by mitochondrial dysfunction of egg cells.

This invention relates to the field of cell biology, and more particularly to a method for constructing an artificial cell model in vitro based on extracts from Xenopus laevis egg cells. The method includes: mixing cytoplasmic extracts from Xenopus laevis egg cells, demembranous sperm, and tubulin, dispersing the mixture in an oil phase to obtain a reconstructed system; reacting the reconstructed system at 20-24°C for at least 30 minutes, resulting in the formation of a phospholipid bilayer-based cytoplasmic membrane structure around the cell. This invention provides a method for constructing artificial cells by selecting cytoplasmic extracts from Xenopus laevis egg cells, adding specific substances, and reacting under specific conditions to allow the extracts to self-assemble into cell structures in vitro, simultaneously forming a cytoplasmic membrane. The method provided by this invention offers important clues to the origin and evolution of cells, and the resulting artificial cell structures are highly similar to normal cells, possessing significant application value.

The invention discloses a method for rapidly establishing a respiratory syncytial virus susceptible animal model based on adenovirus transduction and application, and belongs to the technical field of animal models. The method comprises the following steps: constructing a homologous arm targeting vector carrying human-derived hIGF1R; the method comprises the following steps: injecting a homologous arm targeting vector, specific sgRNA and mRNA encoding Cas9 enzyme into a mouse fertilized egg cell to obtain an F0-generation positive mouse, and mating the F0-generation positive mouse with a wild-type same-strain mouse to obtain an F1-generation heterozygote mouse; the respiratory syncytial virus susceptible model mouse precursor is obtained. Cre enzyme can be transferred through an adenovirus transduction technology, and an STOP element between the promoter and an hIGF1R molecule is cut off, so that human hIGF1R receptor gene expression is quickly started. The animal model not only can reproduce a virus invasion path in a human body, but also can be used as a young small animal model for strict vaccine effectiveness and safety tests, has the characteristics of rapidness and high efficiency compared with a traditional method, and is suitable for in-vivo effectiveness evaluation and infection mechanism research of vaccines, antibodies and drugs under emergency conditions.

During ageing, egg cells display a gradual loss of cohesin complexes. The cohesin loss eventually causes sister chromatids to separate prematurely, which leads to aneuploidy. The inventors engineered an artificial cohesion system, which is a complex for chromatid or chromosome tethering to reduce, for example, age-related premature separation of sister chromatids in eggs. The artificial cohesion system is a complex, which tethers chromosomes or chromatids so that e.g. the risk of aneuploidy is reduced. Said complex comprises (I) one or more first protein(s) and (II) one or more second protein(s), wherein the (I) first and the (II) second protein(s) each comprise (i) a chromatin-binding component, (ii) a protein-binding region being N-terminal of the chromatin-binding component, (Hi) a protein-binding region being C-terminal of the chromatin-binding component. The present invention also includes nucleic acid molecule(s) encoding said complex. Furthermore, several in vitro methods concerning the complex or the nucleic acid molecule(s) encoding said complex also form part of the invention.

A composition includes a contraceptive chimeric virus-like particle with an antigenic carrier domain and one or more antigenic regions from a sperm cell in the antigenic carrier domain, with the antigenic carrier domain including human papillomavirus L1 capsid protein and the antigenic regions including one or more structural elements of the Catsper ion channel complex. When administered to a patient, the contraceptive vaccine stimulates production of anti-sperm antibodies that, upon binding to a sperm cell, inhibit the sperm cell's motility and thus inhibit the ability of the sperm cell to fertilize an egg cell. The induced immunoinfertility of the composition can be reversed for brief or extended lengths of time by overdosing the patient with a reversal agent lacking the antigenic carrier domain but having a protein sequence substantially identical to that of the one or more antigenic regions to sequester the anti-sperm antibodies.

The application discloses a culture solution containing lupeol for improving in-vitro maturation efficiency of pig oocytes and application thereof. The application adds lupeol, especially 4 muM lupeol, to an in-vitro maturation culture solution of oocytes, which can effectively improve the oxidation-reduction state of oocytes, significantly reduce the intracellular ROS level, and meanwhile, improve the GSH content, thereby maximally relieving oxidative stress damage in the in-vitro maturation process, significantly improving the maturation rate of pig oocytes in the meiotic metaphase II, and effectively reducing the DNA fragmentation ratio, which indicates that the lupeol has excellent effects of promoting nuclear maturation and protecting genetic material. The lupeol is added to the in-vitro maturation culture solution of oocytes, which is easy to operate and can be applied to the existing culture process, and can stably improve the efficiency and quality of pig in-vitro embryo production, and has important application value for pig germplasm resource preservation, rapid propagation of excellent breeds and development of animal husbandry.

This disclosure provides methods and compositions for increasing genome editing and site-directed integration events utilizing guided endonucleases and meiotic cell-preferred, egg cell-preferred or embryo tissue-preferred promoters.

The invention discloses an allogenic material introduction method suitable for large-scale oyster egg cells, and belongs to the technical field of marine organisms. Comprising the following steps: (1) dissecting oysters to obtain egg cells, then mixing nucleic acid molecules to be delivered with a transfection reagent to prepare a transfection system, and mixing protein molecules capable of self-assembling to form a condensation body with the nucleic acid molecules in a buffer solution to form a protein-nucleic acid condensation body compound, the transfection reagent contains protein molecules which can be self-assembled to form a condensation body; and (2) mixing seawater containing egg cells with the protein-nucleic acid aggregate compound, incubating, and terminating the reaction. The method is convenient to operate, large in transfection flux and small in damage to cell morphology. The method is suitable for transfection systems of various sizes, and by taking a six-hole cell culture plate as an example, about 8 * 10 < 4 > egg cells can be simultaneously transfected in one hole at most under the condition that the final culture system is about 2ml.

The present invention belongs to the fields of biotechnology and plant breeding. Specifically disclosed are a gene having parthenogenesis-inducing ability in plants, and the use thereof in plant breeding such as induction of haploid formation and apomixis. By means of regulating the expression of a gene that encodes a protein having parthenogenesis-inducing ability, the transition of egg cells into the embryonic development fate is effectively realized, thereby inducing parthenogenesis. The gene and a corresponding induction method therefor can be applied to related plant breeding processes such as the production of haploids and synthetic apomixis.

The application discloses a method and device for characterizing the viscoelasticity of an egg cell based on a nonlinear Maxwell model, a medium and a product, and relates to the field of the viscoelasticity of an egg cell. The method acquires a force-time curve sample set of a shellfish egg cell; a Maxwell model with a nonlinear index parameter is constructed; according to the force-time curve sample set, a differential evolution global optimization algorithm is used to optimize a unified parameter in the Maxwell model, with the maximum minimum determination coefficient in all samples as an optimization target, so that the optimized unified parameter is obtained; the Maxwell model with the optimized unified parameter is fitted and verified, so that it is determined that all samples reach a fitting standard, and a verified Maxwell model is obtained; and the verified Maxwell model is used to describe the nonlinear viscoelastic behavior of the shellfish egg cell. The application can accurately and universally describe the viscoelastic mechanical behavior of the shellfish egg cell.

The invention belongs to the field of biotechnology and plant breeding, and particularly discloses a gene with parthenogenesis induction capacity in plants and application of the gene in plant breeding such as haploid formation induction and apomixis induction. According to the present invention, the expression of the gene coding the protein with the parthenogenesis induction ability is regulated, such that the change from the egg cell to the embryonic development fate is effectively achieved so as to induce parthenogenesis; the gene and the corresponding induction method thereof can be applied to related plant breeding processes such as haploid production and apomixis synthesis.