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First Unaffected Pregnancy Using Preimplantation Genetic Diagnosis for Sickle Cell Anemia
Kangpu Xu, PhD;
Zhong Ming Shi, MD;
Lucinda L. Veeck, MLT, DSc;
Mark R. Hughes, MD, PhD;
Zev Rosenwaks, MD
JAMA. 1999;281:1701-1706.
Context Sickle cell anemia is a common autosomal recessive disorder. However, preimplantation genetic diagnosis (PGD) for this severe genetic disorder previously has not been successful.
Objective To achieve pregnancy with an unaffected embryo using in vitro fertilization (IVF) and PGD.
Design Laboratory analysis of DNA from single cells obtained by biopsy from embryos in 2 IVF attempts, 1 in 1996 and 1 in 1997, to determine the genetic status of each embryo before intrauterine transfer.
Setting University hospital in a large metropolitan area.
Patients A couple, both carriers of the recessive mutation for sickle cell disease.
Interventions Standard IVF treatment, intracytoplasmic sperm injection, embryo biopsy, single-cell polymerase chain reaction and DNA analyses, embryo transfer to uterus, pregnancy confirmation, and prenatal diagnosis by amniocentesis at 16.5 weeks' gestation.
Main Outcome Measure DNA analysis of single blastomeres indicating whether embryos carried the sickle cell mutation, allowing only unaffected or carrier embryos to be transferred.
Results The first IVF attempt failed to produce a pregnancy. Of the 7 embryos analyzed in the second attempt, PGD indicated that 4 were normal and 2 were carriers; diagnosis was not possible in 1. Three embryos were transferred to the uterus on the fourth day after oocyte retrieval. A twin pregnancy was confirmed by ultrasonography, and subsequent amniocentesis revealed that both fetuses were unaffected and were not carriers of the sickle cell mutation. The patient delivered healthy twins at 39 weeks' gestation.
Conclusion This first unaffected pregnancy resulting from PGD for sickle cell anemia demonstrates that the technique can be a powerful diagnostic tool for carrier couples who desire a healthy child but wish to avoid the difficult decision of whether to abort an affected fetus.
Author Affiliations: The Center for Reproductive Medicine and Infertility and the Department of Obstetrics and Gynecology, Weill Medical College of Cornell University, New York, NY (Drs Xu, Shi, Veeck, and Rosenwaks); and the Department of Reproductive Genetics, Wayne State University, Detroit Medical Center, Detroit, Mich (Dr Hughes).
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