DMPK and myotonic dystrophy type 1: The most common strategy for DM1 PGT-M involves PCR amplification across the DMPK CTG repeat and selective transfer of embryos that do not carry the expanded allele for implantation (Sermon et al., 1997, 1998, 2001; Dean et al., 2001; Piyamongkol et al., 2001; Kakourou et al., 2007, 2008, 2010).