title: Rapid genotyping of HLA-B27 among Korean population by real-time PCR melting curve analysis.
abstract: BACKGROUND
  Real-time PCR and melting curve analysis is the relatively recent method for HLA-B27 genotyping, which has advantages of being simple and rapid.
  
  
  METHODS
  The accuracy of melting curve analysis for HLA-B27 was assessed in 153 clinical samples and 52 DNA samples from International Histocompatibility Workshop (IHW) cell lines, with sequence-based typing (SBT) as the reference method. We predicted melting reaction for various HLA-B27 subtypes using simulation software.
  
  
  RESULTS
  For clinical samples, 53 HLA-B27-positive and 100 negative results by melting curve analysis were confirmed by completely concordant SBT results. The B*27:05 allele was found in 50 patients, and the B*27:04 allele in 3 patients. Among 62 known alleles, 21 alleles had differences in the target sequence, including 10 alleles having mismatches in the primer binding site. In these alleles, differences in melting points (T(m)) were predicted to be ≤ 1.2°C. The predicted results were obtained when IHW samples were tested, which revealed slight lower T(m) for B*27:06 and negative results for B*27:07.
  
  
  CONCLUSIONS
  Genotyping of HLA-B27 by melting curve analysis was fast and reliable for routine laboratory testing for frequent alleles. In silico melting simulations provided useful information about the utility and limitation of this method for diverse HLA-B27 alleles.
authors.affiliation: Department of Laboratory Medicine, Seoul National University College of Medicine, Seoul, Republic of Korea.
authors.forename: Seon Young
authors.initials: SY
authors.lastname: Kim
authors.forename: Ho Eun
authors.initials: HE
authors.lastname: Chang
authors.forename: Sang Hoon
authors.initials: SH
authors.lastname: Song
authors.forename: Kyoung Un
authors.initials: KU
authors.lastname: Park
authors.forename: Junghan
authors.initials: J
authors.lastname: Song
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000483:Alleles; D005260:Female; D005838:Genotype; D060005:Genotyping Techniques / Q000379:methods*; D015796:HLA-B27 Antigen / Q000235:genetics*; D006801:Humans; D008297:Male; D008875:Middle Aged; D060888:Real-Time Polymerase Chain Reaction / Q000379:methods*; D056910:Republic of Korea; D044366:Transition Temperature; D055815:Young Adult
chemical_list: D015796:HLA-B27 Antigen