Definition of Cloning and SCNT
Cloning is the production of genetically identical individuals by the process of asexual reproduction . In animals, the term has been applied to offspring that are produced by the technique of nuclear transfer (NT) . The process of nuclear transfer involves the production of an embryo by transferring nuclear genetic material from a donor cell (karyoplast ) into a recipient cell from which the genetic material has been removed (cytoplast ). Two factors determine the clonality of the resultant offspring. One is the recipient cell, generally an oocyte or unfertilized egg obtained from an unrelated animal. The second is the donor cell, which can be obtained from a variety of sources including embryos, germ line, and somatic tissues of fetuses and adult organisms. When cells from somatic tissues are used,...
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Abbreviations
- Aneuploid:
-
An unbalanced number of chromosomes.
- Blastocyst:
-
A stage of early development where the embryo contains a fluid-filled cavity and two cell populations: an inner cell mass and an outer layer of trophectoderm cells.
- Cell cycle:
-
The period between the birth of a cell and its division. During a single cell cycle, the cell must duplicate all of its components, including DNA, to form two equal daughter cells.
- Chromatin:
-
The combination of DNA and proteins, mostly histones.
- Cytoplast:
-
An enucleated cell used as a recipient for a donor nucleus. Generally in SCNT, the recipient cytoplast is an enucleated oocyte.
- Diploid:
-
The cell or nucleus contains two complete copies of the genome or a complete complement of chromosomes (2n), in general, a single maternal and a single paternal.
- Donor cell:
-
The cell that provides the genetic material (nucleus) for SCNT. The resulting animal will be a genomic copy of the animal from which this cell was collected.
- Haploid:
-
The cell or nucleus contains only a single copy of the genome or half of the chromosome complement (n). Pronuclei are, in general, haploid, containing either a single maternal genome or a single paternal genome.
- Karyoplast:
-
A cell or a membrane-bound portion of a cell containing the donor nucleus enclosed. In livestock SCNT, the karyoplast is generally an intact cell.
- Meiosis:
-
The process of reduction in the number of chromosomes that occurs during germ cell formation. Following a round of DNA synthesis, a single cell undergoes two rounds of division resulting in four cells, each containing a haploid genome. During division, independent assortment of parental chromosomes and homologous recombination generate a unique haploid genotype in each of the germ cells.
- Metaphase II (MII):
-
Stage during the second meiotic division where the chromosomes are aligned at the metaphase plate prior to segregation of sister chromatids to opposite poles. In most mammalian species, mature oocytes arrest at MII and meiosis is reinitiated and completed upon fertilization.
- Parthenote:
-
An unfertilized zygote produced by activation of an oocyte. A parthenote may be haploid or diploid for maternal DNA, a gynogenote, or following enucleation and replacement with paternal DNA, an androgenote.
- Tetraploid:
-
The cell or nucleus contains four haploid copies of the genome (4n).
- Zygote:
-
The 1-cell stage of development of a fertilized embryo. During most of the first cell cycle, the zygote will contain two pronuclei containing the maternal and paternal DNA.
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German, S.D., Campbell, K.H.S. (2013). Livestock Somatic Cell Nuclear Transfer . In: Christou, P., Savin, R., Costa-Pierce, B.A., Misztal, I., Whitelaw, C.B.A. (eds) Sustainable Food Production. Springer, New York, NY. https://doi.org/10.1007/978-1-4614-5797-8_2
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