title: [Establishment of a novel HLA genotyping method for preimplantation genetic diagnonis using multiple displacement amplification-polymerase chain reaction-sequencing based technique].
abstract: OBJECTIVE
  To establish a novel HLA genotyping method for preimplantation genetic diagnonis (PGD) using multiple displacement amplification-polymerase chain reaction-sequencing based technique (MDA-PCR-SBT).
  
  
  METHODS
  Peripheral blood samples and 76 1PN, 2PN, 3PN discarded embryos from 9 couples were collected. The alleles of HLA-A, B, DR loci were detected from the MDA product with the PCR-SBT method. The HLA genotypes of the parental peripheral blood samples were analyzed with the same protocol. The genotypes of specific HLA region were evaluated for distinguishing the segregation of haplotypes among the family members, and primary HLA matching was performed between the embryos.
  
  
  RESULTS
  The 76 embryos were subjected to MDA and 74 (97.4%) were successfully amplified. For the 34 embryos from the single blastomere group, the amplification rate was 94.1%, and for the 40 embryos in the two blastomeres group, the rate was 100%. The dropout rates for DQ allele and DR allele were 1.3% and 0, respectively. The positive rate for MDA in the single blastomere group was 100%, with the dropout rates for DQ allele and DR allele being 1.5% and 0, respectively. The positive rate of MDA for the two blastomere group was 100%, with the dropout rates for both DQ and DR alleles being 0. The recombination rate of fetal HLA was 20.2% (30/148). Due to the improper classification and abnormal fertilized embryos, the proportion of matched embryos HLA was 20.3% (15/74),which was lower than the theoretical value of 25%.
  
  
  CONCLUSIONS
  PGD with HLA matching can facilitate creation of a HLA-identical donor (saviour child) for umbilical cord blood or bone marrow stem cells for its affected sibling with a genetic disease. Therefore, preimplantation HLA matching may provide a tool for couples desiring to conceive a potential donor progeny for transplantation for its sibling with a life-threatening disorder.
authors.affiliation: Reproduction Medicine Center, Tianjin Central Gynecology and Obstetrics Hospital, Tianjin 300053, P.R. China. tjzys@hotmail.com.
authors.forename: Yinfeng
authors.initials: Y
authors.lastname: Zhang
authors.forename: Haining
authors.initials: H
authors.lastname: Luo
authors.forename: Yunshan
authors.initials: Y
authors.lastname: Zhang
mesh_terms: D001755:Blastocyst / Q000166:cytology / Q000378:metabolism; D005260:Female; D005838:Genotype; D060005:Genotyping Techniques / Q000379:methods*; D006680:HLA Antigens / Q000235:genetics*; D059866:HLA-DQ beta-Chains / Q000235:genetics; D059811:HLA-DRB1 Chains / Q000235:genetics; D006801:Humans; D016133:Polymerase Chain Reaction / Q000379:methods*; D011247:Pregnancy; D019836:Preimplantation Diagnosis / Q000379:methods*; D015203:Reproducibility of Results; D017422:Sequence Analysis, DNA / Q000379:methods*
chemical_list: D006680:HLA Antigens; D059866:HLA-DQ beta-Chains; C069051:HLA-DQB1 antigen; D059811:HLA-DRB1 Chains