摘要:
The invention provides a composition comprising an extraembryonic endodermal (XEN) cell and/or an embryonic fibroblast (EF) cell. The invention also provides a method of establishing a XEN cell line or a primary embryonic fibroblast (EF) cell line in vitro, the method comprising culturing a zygote or parthenote from a mammal for a time sufficient to produce one or more blastocysts; and culturing the one or more blastocysts on feeder cells in culture medium for a time sufficient to produce one or a plurality of XEN cells and/or one or a plurality of EF cells.
摘要:
The invention relates to methods of minimising environmental impacts from farmed animals, such as dairy animals. More specifically, the invention relates to a method of minimising the nitrogen load from animals by the steps of: (a) testing animals to identify individual nitrogen load; and, (b) manipulating animal gene or genes in order to reduce the average nitrogen load. By identifying animals with a low average nitrogen load, they may then be manipulated and appropriate management used, for example, by grazing such animals in certain land areas that are more at risk of nitrogen emissions to the environment or by breeding from these animals. Animals with a high average nitrogen load could be grazed in areas that have a lower risk of nitrogen emission or could be culled altogether.
摘要:
Chickens that selectively produce female offspring are provided. In some aspects, a bird or cells thereof are provided that comprise an autosomal repressor cassette integrated on at least one copy of an autosome, which can suppress the expression of a protein essential for early development. In some aspects, a bird or cells thereof are provided that comprise an ectopic rescue cassette and a repressor cassette on the W or Z chromosome, which can selectively rescue embryo development in progeny animals. Methods for producing such animals and for production of commodity poultry eggs are also provided.
摘要:
The subject invention pertains to a Molecular Cell Diary System (MCDS), which allows identification of the history of somatic alterations in the cell. MCDS comprises one or more combinations of a DNA cutter and a DNA writer expressed under the control of a promoter controlled a cellular event of interest. The DNA cutter and the DNA writer are in a combination are co-expressed when an even of interest occurs. The DNA cutter creates double strand breaks (DSB) in a target DNA in a sequence specific manner and the DNA writer incorporates DNA sequences in the DSB. The endogenous DNA repair machinery synthesizes repairs the DSB. As such, the combination of the DNA cutter and the DNA writer modifies the target DNA and leaves "marks" of the occurrence of the cellular event of interest. These marks are sequenced and the cellular event history of the cell is deciphered.
摘要:
Described herein are donor vectors and systems for use in in vivo dual recombinase-mediated cassette exchange. Also described are animal models for consistent, rigorous, and facile investigation of transgene expression. Further described are methods of screening for therapeutic drugs using these animal models, and methods of treatment
摘要:
Provided herein is a recombinant or transgenic non-human mammal comprising a nucleic acid encoding a mutant three-prime exonuclease 1 (three prime repair exonuclease 1; TREX1), and in particular aspects the mammal expresses the mutant Trex1 protein. The non-human mammal is useful for identifying candidate compounds for the treatment of autoimmune disease (in human or animal, typically mammalian) subjects. Another aspect of the invention is, accordingly, a method for indentifying candidate compounds for the treatment of autoimmune disease or disorder comprising: providing the recombinant non-human mammal; administering a test substance to the recombinant non-human mammal; and determining whether said test substance reduces at least one indicia of autoimmune disease in said mammal, wherein a reduction in said at least one indicia indicates said test substance is a candidate compound for the treatment of autoimmune disease.
摘要:
The present invention relates to methods of gender determination and identification in avian subjects. More specifically, the invention provides non-invasive methods using transgenic avian animals that comprise at least one reporter gene integrated into at least one gender chromosome Z or W. The transgenic avian animals of the invention are used for gender determination and selection of embryos in unhatched avian eggs.
摘要:
A genetically modified NOD.Cg -Prkdc scid Il2rg tm1Wjl /Sz J mouse is provided by the present invention wherein the genome of the mouse includes a mutated Rhbdf2 gene such that the mouse expresses a mutant iRhom2 protein, wherein the mutant iRhom2 protein differs from wild-type iRhom2 protein due to one or more mutations selected from p.I156T, p.D158N and p.P159L, and wherein the mouse is characterized by hairless phenotype and increased growth of an exogenous tumor compared to a mouse of the same genetic background which express wild-type iRhom2 protein.
摘要:
In one aspect, the Invention relates to methods and compositions to remove replicate genetic material, such as duplicate copy number variations (CNVs) present in genetic material using targeted endonuclease technology with one guide, such as one single guide RNA. In another aspect, the invention relates to methods and compositions useful for removing replicate or duplicate genetic material. In another aspect the invention is useful for the treatment and prevention of conditions that are caused by replicate genetic material, including duplicate CNVs, such as a certain types of Duchenne Muscular Dystrophy and or MECP2 duplication syndrome. In another aspect the invention provides novel genetically engineered animals with duplicate CNVs useful to screen potential therapies.
摘要:
According to some embodiments herein, expression systems and methods for activity-dependent transcription of nucleic acids are provided. In some embodiments, adeno-associated viral vector systems comprise an immediate early gene promoter operably linked to a transcriptional activator. The transcription activator can be fused to an N-terminal portion of an immediate early gene, for example fos.