A novel DR beta 1*03 allele identified by polymerase chain reaction-restriction fragment length polymorphism.

This report describes a new MHC class II allele, HLA-DR beta 1*0306, discovered in a 31-year-old Norwegian male. The allele typed serologically as DRw52 (DR3) and amplified in PCR using DR52-associated group primers. This product could not be identified using established restriction digests, however. Use of Asp 700, Msp I, Hha I, Bse RI, Mnl I, Hph I, and Bsrb I gave banding patterns expected for a DR beta 1*03011 allele, but Rsa I had an additional site at codon 47. Sequencing showed a single base change at this position, with the substitution of tyrosine for phenylanine in this new allele. The biologic impact of this substitution remains to be determined.