Heterogeneity of HLA-G genes identified by polymerase chain reaction/single strand conformational polymorphism (PCR/SSCP).
A genomic HLA-G clone named 7.0E was isolated from a Japanese placenta. The deduced amino acid sequence of the 7.0E was identical to two HLA-G genomic clones and two cDNA clones previously described. The DNA sequences of alpha 1 and alpha 2 domains of the HLA-G gene from 5 cell lines also encoded the same amino acids. However, a 14 bp insertion, ATTTGTTCATGCCT, was present in the 3' untranslated region of 7.0E compared with the originally described HLA-G clone (HLA 6.0). Polymerase chain reaction (PCR)/single strand conformational polymorphism (SSCP) analysis of exon 8 allowed the HLA-G gene to be classified into two alternative types, G6.0 and 7.0 E, those correlated to the absence or the presence of the 14 bp stretch. Each group had minor sequence variant(s), and the alleles of the 7.0E-type were more heterogeneous than those of the G6.0-type. The 14 bp deletion is present only in the G6.0-type of HLA-G alleles among HLA class I genes. Thus it was suggested that G6.0 alleles were generated after diversification of the HLA-G.
Tamaki
J
J
Institute of Immunological Science, Hokkaido University, Japan.
Arimura
Y
Y
Koda
T
T
Fujimoto
S
S
Fujino
T
T
Wakisaka
A
A
Kakinuma
M
M
D000483:Alleles; D000595:Amino Acid Sequence; D000951:Antigens, Neoplasm / Q000032:analysis; D001483:Base Sequence; D005805:Genes, MHC Class I; D006680:HLA Antigens / Q000235:genetics*; D015793:HLA-B7 Antigen / Q000032:analysis; D059951:HLA-G Antigens; D015395:Histocompatibility Antigens Class I / Q000235:genetics*; D006801:Humans; D007564:Japan; D008969:Molecular Sequence Data; D010920:Placenta / Q000737:chemistry; D016133:Polymerase Chain Reaction; D011110:Polymorphism, Genetic; D017386:Sequence Homology, Amino Acid; D014407:Tumor Cells, Cultured
D000951:Antigens, Neoplasm; D006680:HLA Antigens; D015793:HLA-B7 Antigen; D059951:HLA-G Antigens; D015395:Histocompatibility Antigens Class I