PGTP process starts off the same as any other pre-implantation genetic test. Clinicians take a small sample of a days old embryo and sequence its DNA. Then, using information from studies of polygenic risks, they find variants that correlate with the likelihood of developing a certain condition later in life.
Companies are offering genetic tests of embryos generated by in vitro fertilization that they say allow prospective parents to choose those with the lowest risk for diseases such as diabetes or certain cancers. However, some researchers are concerned about the accuracy and ethics of these tests.
This is an audio version of our Feature: The controversial embryo tests that promise a better baby
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