Tetraploid Embryo Complementation
Tetraploid Embryo Complementation - Related Videos
10:04
Establishment of Proliferative Tetraploid Cells from Nontransformed Human Fibroblasts
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Cited by 2 •
2017
Although proliferative polyploid cells are necessary to analyze chromosomal instability of polyploid cells, creating such cells from nontransformed human cells is not easy. The present report describes relatively simple procedures to establish proliferative tetraploid cells free of a diploid population from normal human fibroblasts.
06:17
Depletion of Specific Cell Populations by Complement Depletion
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Cited by 15 •
2010
To effectively study the function of immune cell populations their purification is often required. Complement depletion is a fast and inexpensive technique for the isolation of immune cell populations with high purity.
01:27
Complement System
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2024
The complement system is a group of approximately 20 plasma proteins that strengthen the body's defenses against infections through opsonization, inflammation, and cell lysis. Opsonization involves coating pathogens with complement proteins, making them more recognizable and facilitating phagocyte engulfment. Certain complement proteins induce inflammation that attracts immune cells to the site of infection. Cell lysis involves the destruction of pathogens through the formation of a membrane...
00:49
Complementation Tests
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2021
A complementation test is a simple cross to identify whether the two mutations are located on the same gene or different genes. It was first performed by Edward Lewis in the 1940s while working on fruit flies. He developed the test to identify the location and arrangement of different mutations on chromosomes. Organisms heterozygous for different mutations are crossed pairwise in all combinations. If present on different genes, the mutations can complement each other by providing the missing...
04:29
Bimolecular Complementation Affinity Purification to Isolate Two Interacting Proteins
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2025
In this video, we have demonstrated bimolecular complementation affinity purification, BiCAP, to detect and isolate specific protein dimers using conformation-specific single-domain antibodies.
FAQs
Tetraploid cells primarily support the extraembryonic component, whereas introduced embryonic stem or induced pluripotent stem cells contribute to the embryo proper. This division lets investigators assess whether the donor population can supply the cells needed for embryonic development rather than merely participating in a mixed cell population. The resulting lineage separation is central to interpreting complementation experiments.
The assay places a demanding developmental requirement on the donor cells: they must generate the embryo proper within an embryo whose tetraploid cells mainly form extraembryonic tissues. Consequently, complementation provides stronger evidence of developmental potential than an assessment limited to selected cell types or isolated differentiation outcomes. It is therefore used to evaluate the functional capacity of pluripotent stem-cell lines.
Conversion changes the expected contribution of the embryo’s own cells, making tetraploid cells primarily associated with extraembryonic tissues. This creates a developmental setting in which the introduced pluripotent cells can be examined for their contribution to the embryo proper. The altered cellular arrangement is what allows the assay to distinguish donor-cell developmental capacity from the supporting role of tetraploid cells.
Electrofusion is commonly performed at the two-cell stage to convert diploid embryos into tetraploid embryos. The resulting embryos are then used to produce blastocysts, into which pluripotent embryonic stem or induced pluripotent stem cells are introduced. Maintaining this sequence is important because the assay depends on establishing the tetraploid embryo before evaluating donor-cell contributions.
A typical workflow begins with diploid embryos, followed by electrofusion at the two-cell stage to generate tetraploid embryos. These embryos develop into blastocysts, and pluripotent embryonic stem or induced pluripotent stem cells are introduced into them. Researchers then evaluate whether the donor cells contribute to the embryo proper, using that outcome to assess developmental potential.
Tetraploid embryo complementation supports several related investigations: evaluating stem-cell pluripotency, dissecting contributions to distinct cell lineages, and studying early mammalian development. Because tetraploid and donor cells have different developmental contributions, the assay can connect a stem-cell population with its capacity to participate in embryonic formation. Its use is especially relevant when a stringent functional test is required.
The method is technically demanding, and complementation is inefficient. These limitations make it unsuitable for routine use despite the strength of its developmental readout. Experimental interpretation therefore depends on recognizing that an unsuccessful or infrequent complementation event may reflect procedural constraints as well as the developmental properties of the tested embryonic or induced pluripotent stem-cell population.