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preimplantation genetic diagnosis

preimplantation genetic diagnosis (PGD) The screening of early embryos for disease-causing genes to enable the selection of ‘healthy’ embryos. The technique is used in conjunction with in vitro fertilization, which typically yields a number of embryos. A single cell is removed from an eight-stage embryo and subjected to genetic testing; for example, it may be tested for a specific disease allele using either a gene probe and fluorescence in situ hybridization or the polymerase chain reaction. If the results are satisfactory, the embryo is implanted in the mother's uterus, and development proceeds. Removal of a single cell at this stage does not affect the embryo's subsequent development. PGD can help especially when couples who are being treated for fertility problems also have a history of genetic disease. However, use of PGD can be extended in nontherapeutic ways, such as choosing a baby's sex or selecting particular desired traits to produce so-called ‘designer babies’. These highly controversial applications of PGD are prohibited in certain countries, including the UK.

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"preimplantation genetic diagnosis." A Dictionary of Biology. . Encyclopedia.com. 16 Aug. 2017 <http://www.encyclopedia.com>.

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"preimplantation genetic diagnosis." A Dictionary of Biology. . Retrieved August 16, 2017 from Encyclopedia.com: http://www.encyclopedia.com/science/dictionaries-thesauruses-pictures-and-press-releases/preimplantation-genetic-diagnosis

preimplantation genetic diagnosis

preimplantation genetic diagnosis (PGD) (pree-im-plahn-tay-shŏn) n. prenatal genetic diagnosis extended to the earliest stages of embryonic development, before implantation occurs.

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"preimplantation genetic diagnosis." A Dictionary of Nursing. . Encyclopedia.com. 16 Aug. 2017 <http://www.encyclopedia.com>.

"preimplantation genetic diagnosis." A Dictionary of Nursing. . Encyclopedia.com. (August 16, 2017). http://www.encyclopedia.com/caregiving/dictionaries-thesauruses-pictures-and-press-releases/preimplantation-genetic-diagnosis

"preimplantation genetic diagnosis." A Dictionary of Nursing. . Retrieved August 16, 2017 from Encyclopedia.com: http://www.encyclopedia.com/caregiving/dictionaries-thesauruses-pictures-and-press-releases/preimplantation-genetic-diagnosis

preimplantation genetic diagnosis

preimplantation genetic diagnosis: see embryo screening.

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"preimplantation genetic diagnosis." The Columbia Encyclopedia, 6th ed.. . Encyclopedia.com. 16 Aug. 2017 <http://www.encyclopedia.com>.

"preimplantation genetic diagnosis." The Columbia Encyclopedia, 6th ed.. . Encyclopedia.com. (August 16, 2017). http://www.encyclopedia.com/reference/encyclopedias-almanacs-transcripts-and-maps/preimplantation-genetic-diagnosis

"preimplantation genetic diagnosis." The Columbia Encyclopedia, 6th ed.. . Retrieved August 16, 2017 from Encyclopedia.com: http://www.encyclopedia.com/reference/encyclopedias-almanacs-transcripts-and-maps/preimplantation-genetic-diagnosis