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How can preimplantation genetic diagnosis detect Tay-Sachs disease?

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Preimplantation genetic diagnosis (PGD) is a procedure used to identify genetic defects in embryos created through in vitro fertilization prior to their implantation in the uterus.12

To detect Tay-Sachs disease, which is an autosomal recessive disorder, the process involves the following steps:

Biopsy: A single cell is extracted from the embryo.2
Analysis: DNA is isolated from the cell and analyzed using polymerase chain reaction (PCR).2

This molecular technique allows scientists to identify specific gene mutations associated with the disease. By screening embryos in this manner, couples who are carriers of the Tay-Sachs gene can select embryos that are free of the mutation, thereby preventing the transmission of the condition to their offspring.12

It is important to note that while PGD is a powerful tool for preventing inherited diseases, it is subject to ethical considerations, including the potential for false results and the broader debate regarding the selection of embryos based on genetic traits.1