PGD for TSD is performed at a number of centers, but this is the first time the test has been performed
in Cyprus. All stages of assisted reproduction and embryo biopsy were carried out as previously described
(Palmer et al., 2002). Four cleavage-stage embryos (day 3) were biopsied and the single blastomere
biopsies were analyzed for the four STR markers. One embryo failed to proliferate after the biopsy and was
omitted from the analysis. Two embryos were diagnosed as TSD carriers. In the third embryo,
contamination of the sample was detected and was rejected. Only embryo 1, which was diagnosed as a
carrier of the silent mutation c.1305CNT(p.=), successfully reached the expanded blastocyst stage and was
transferred on day 5.