Sequencing based typing for HLA-C. Identification of three new alleles: Cw*0307, Cw*0502 and Cw*0504.
HLA-C has been described as a transplantation locus in the unrelated bone marrow transplantation setting, and noticeably the number of mismatches between HLA-A,-B,-DRB1 compatible pairs is considerably high. Sequencing based typing (SBT) is an accurate and efficient methodology utilised in the HLA class I and II allele level of resolution. SBT for HLA-C locus was applied on a sample of 40 HLA-A,B,DRB1,DRB3/4/5,DQB1-compatible bone marrow recipient-donor pairs, and 3 new HLA-C alleles have been found. Cw*0307, well defined by serology as Cw3, showed two amino acid changes at the NK motif 77-80 regarding all described Cw*03 alleles, N77K80 instead of S77N80. Two new Cw*05 alleles were described, Cw*0502 properly typed by serology, and Cw*0504 that behaves as a short antigen. Cw*0502 differed from Cw*0501 by only one nucleotide at exon 3, that generated an amino acid replacement at codon 177, K to E. Cw*0504 differs from Cw*0501 by two clustered amino acid positions (114 and 116) placed at the peptide binding site. The rate of new HLA-C alleles found in this small series evidences a high grade of hidden HLA-C diversity in the Spanish population, particularly in the well-defined serologic specificities.
Santos
S
S
Laboratory of Histocompatability, Regional Transfusion Centre, Menendez-Pelayo 85, 28009 Madrid, Spain.
Vicario
J L
JL
Garcia-Sanchez
F
F
Aviles
M J
MJ
Balas
A
A
D000483:Alleles; D000595:Amino Acid Sequence; D005091:Exons / Q000235:genetics; D015236:HLA-C Antigens / Q000235:genetics*; D006801:Humans; D008969:Molecular Sequence Data
D015236:HLA-C Antigens; C038653:HLA-C*03 antigen