Singleton birth after preimplantation genetic diagnosis for Huntington disease using whole genome amplification.

OBJECTIVE To report a successful case of preimplantation genetic diagnosis (PGD) for Huntington disease using whole genome amplification. DESIGN Case report. SETTING University assisted reproduction unit. PATIENT(S) A couple with family history of Huntington disease: The husband was carrying the expanded allele of the IT15 gene, and the wife had the normal allele. INTERVENTION(S) Preimplantation genetic diagnosis with whole genome amplification for identification of genetically normal embryos. MAIN OUTCOME MEASURE(S) Live birth. RESULT(S) In an IVF cycle, 15 oocytes were retrieved, of which 13 were mature and 11 were fertilized. On day 3, embryo biopsy and PGD were performed on ten good-quality embryos. Multiple displacement amplification was conducted, followed by polymerase chain reaction with fluorescence primers. Three pairs of primers were used for the amplification of the IT15 gene at the: 1) trinucleotide expansion site; 2) trinucleotide expansion site plus the polymorphic site situated on its 3'-end; and 3) polymorphic marker located downstream of the trinucleotide repeats. Two normal blastocysts were replaced on day 5 and another two good-quality blastocysts were cryopreserved. The woman gave birth to a normal baby girl whose normal genetic status was confirmed by prenatal diagnosis. CONCLUSION(S) Whole genome amplification by multiple displacement amplification can be used for PGD of Huntington disease.