Abstract
The HLA-DRB3/B4/B5 sequence-based typing method developed in this study in combination with PCR-SSP, enabled us to identify a new DRB3*02 allele, that was named as DRB3*0209 (GenBank accession number AF148518). This name has been officially assigned by the WHO Nomenclature Committee in May 1999. The new allele differs from DRB3*0207 by one substitution in codon 51 from AGG to ACG and another in codon 60 from TAC to TCC, resulting in aminoacid changes from Arg-->Thr (codon 51) and from Tyr-->Ser (codon 60). The DRB3*0209 allele was discovered in two related North Italian families. The fact that it was present in an hemizygous situation in three members of the paternal family and in one member of the secondary related family enabled us to isolate and sequence the new DRB3 allele without cloning, to identify its association with the DRB1 locus, and to generate an Epstein-Barr virus (EBV)-transformed cell line, now present in our ECBR (European Collection for Biomedical Research) Cell Line Bank.
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