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Method for producing somatic cell cloned bovine blastocyst

A technology of somatic cell cloning and donor cells, applied in biochemical equipment and methods, botany equipment and methods, applications, etc., can solve the problem of low efficiency of somatic cell cloning

Inactive Publication Date: 2012-11-07
INST OF ANIMAL SCI OF CHINESE ACAD OF AGRI SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Nevertheless, the efficiency of bovine somatic cell cloning is still very low. Therefore, starting from the key links of somatic cell cloning, it is of great significance to develop a high-efficiency somatic cell cloned bovine blastocyst production method

Method used

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  • Method for producing somatic cell cloned bovine blastocyst
  • Method for producing somatic cell cloned bovine blastocyst
  • Method for producing somatic cell cloned bovine blastocyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Example 1 Preparation of cloned bovine blastocysts by the somatic cell cloning method of the present invention

[0039] (1) Preparation of donor cells

[0040] Take 5-15 generations of Holstein bull ear margin fibroblasts, when the cells grow to 70-80% confluence, replace the DMEM medium containing 0.5% fetal bovine serum, continue to culture for 3-5 days, and then use them.

[0041] (2) Collection and in vitro maturation and culture of oocytes

[0042] Take cattle ovaries from the slaughterhouse, put them in normal saline at about 30℃, and transport them back to the laboratory in time. After washing the ovaries three times with normal saline, use a vacuum pump to suck follicles with a diameter of 2-8mm, and select the complete and dense cumulus-oocyte complexes (COCs) under a stereo microscope. First wash twice with 0.01% PVA-free calcium-magnesium PBS solution, then transfer it into TCM199+10%FBS+0.01IU / mL FSH+0.01IU / mLLH+1μg / mL E2 mature medium, 50-60 pieces / well. Place in...

Embodiment 2

[0050] Example 2 Preparation of cloned blastocysts by manual cloning

[0051] Among them, the preparation of donor cells, the collection and in vitro maturation and culture of oocytes, the activation and in vitro culture of reconstructed embryos are the same as the corresponding steps in Example 1. The oocytes are enucleated and zona-free oocytes are combined with the body. The cell fusion process is as follows:

[0052] Manually denuclear:

[0053] The oocyte-cumulus cell complex that has been matured in vitro for about 18 hours is treated with 0.1% hyaluronidase to remove granular cells, and then placed in a maturation solution with 5% decarboxycolcine (Demecolcine, DC) for 2 hours Then select the oocytes with uniform cytoplasm and discharge the polar body, digest the zona pellucida with 0.5% pronase, cut off the protruding part with a microdissecting knife under a stereo microscope, and put the non-nucleated oocytes into T20 Reserve in the droplet. see Figure 5 with 6 .

[0054...

Embodiment 3

[0057] Example 3 Preparation of cloned blastocysts by microinjection

[0058] Among them, the preparation of donor cells, the collection and in vitro maturation culture of oocytes, the activation and in vitro culture of reconstructed embryos are the same as the corresponding steps in Example 1. The construction process of oocyte denucleation and reconstructed embryos is as follows:

[0059] Microscopic denucleation:

[0060] Move the oocytes with the first polar body into the operating solution H199+7.5ug / mL cell relaxin B droplet, and use a 20μm diameter glass pipette (with a tip) to remove the first polar body and The chromosomes in the oocyte below it are also sucked out. After the operation, the oocytes were transferred to the corresponding droplets in another dish, the cytoplasm containing the chromosomes was stained with Hoechst33342 for 5 minutes, and the enucleation rate was checked under UV light. The oocytes with complete enucleation were washed three times in T20 solution...

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Abstract

he invention discloses a method for producing somatic cell cloned bovine blastocysts. According to the method, to bovine ear limbal fibroblasts are used as nuclear transfer donorcells, and mature bovine oocytes cultivated in vitro are used as nuclear transfer receptor cells; the oocytes are denucleated by extrusion and removed with the zona pellucida; the oocytes and the donor cells are adhered in an arrangement way of oocytes-donor cells-oocytes and treated with electro-fusion to obtain reconstructed embryos; and the reconstructed embryos are activated and cultured in vitro to obtain the cloned blastocysts. The method can improve the production efficiency of the cloned bovine blastocysts.

Description

Technical field [0001] The invention relates to a method for producing somatic cell cloned bovine blastocysts. Background technique [0002] Mammalian somatic cell cloning refers to the transfer of somatic cell nuclei into enucleated recipient cells (mature oocytes or fertilized eggs), and new reconstructed embryos are reprogrammed, divided, differentiated and developed according to the genetic information of the donor. The more popular methods of somatic cell nuclear transfer are manual cloning and micromanipulation. [0003] The efficiency of cloning technology itself is affected by various links, including the enucleation of oocytes, somatic cell injection into oocytes, fusion of enucleated oocytes and somatic cells, activation of reconstructed embryos, and in vitro culture of reconstructed embryos. [0004] During the cloning process, the denucleation of mature oocytes is an important part of nuclear transfer technology, which requires complete removal while minimizing damage to...

Claims

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Application Information

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IPC IPC(8): C12N15/877
Inventor 杜卫华朱化彬
Owner INST OF ANIMAL SCI OF CHINESE ACAD OF AGRI SCI
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