TY - JOUR T1 - Preimplantation genetic testing for a chr14q32 microdeletion in a family with Kagami-Ogata syndrome and Temple syndrome JF - Journal of Medical Genetics JO - J Med Genet DO - 10.1136/jmedgenet-2020-107433 SP - jmedgenet-2020-107433 AU - Joan Sabria-Back AU - Ana Monteagudo-Sánchez AU - Marta Sánchez-Delgado AU - Anne C Ferguson-Smith AU - Olga Gómez AU - Africa Pertierra Cartada AU - Jair Tenorio AU - Julián Nevado AU - Pablo Lapunzina AU - Arrate Pereda Aguirre AU - Carles Giménez Sevilla AU - Estefanía Toro Toro AU - Guiomar Perez de Nanclares AU - David Monk Y1 - 2021/02/12 UR - http://jmg.bmj.com/content/early/2021/02/11/jmedgenet-2020-107433.abstract N2 - Introduction Kagami-Ogata syndrome (KOS14) and Temple syndrome (TS14) are two disorders associated with reciprocal alterations within the chr14q32 imprinted domain. Here, we present a work-up strategy for preimplantation genetic testing (PGT) to avoid the transmission of a causative micro-deletion.Methods We analysed DNA from the KOS14 index case and parents using methylation-sensitive ligation-mediated probe amplification and methylation pyrosequencing. The extent of the deletion was mapped using SNP arrays. PGT was performed in trophectoderm samples in order to identify unaffected embryos. Samples were amplified using multiple displacement amplification, followed by genome-wide SNP genotyping to determine the at-risk haplotype and next-generation sequencing to determine aneuploidies.Results A fully methylated pattern at the normally paternally methylated IG-DMR and MEG3 DMR in the KOS14 proband, accompanied by an unmethylated profile in the TS14 mother was consistent with maternal and paternal transmission of a deletion, respectively. Further analysis revealed a 108 kb deletion in both cases. The inheritance of the deletion on different parental alleles was consistent with the opposing phenotypes. In vitro fertilisation with intracytoplasmatic sperm injection and PGT were used to screen for deletion status and to transfer an unaffected embryo in this couple. A single euploid-unaffected embryo was identified resulting in a healthy baby born.Discussion We identify a microdeletion responsible for multigeneration KOS14 and TS14 within a single family where carriers have a 50% risk of transmitting the deletion to their offspring. We show that PGT can successfully be offered to couples with IDs caused by genetic anomalies. ER -