HLA Alleles Numbers

Assigned as of September 2023

The numbers below represent the number of named alleles for each gene. This number includes alleles that have been named but whose sequences are still confidential. This means that the number of sequences found in some files on this site may differ from the number of sequences indicated in this table. Details of the alleles that are still confidential can be seen in the latest version reports on the IPD-IMGT/HLA Database web site. The numbers below do not include the names of any deleted alleles - further details of deleted alleles can be found here. If you wish to cite these numbers in a publication, please see our citations page for further details.


Numbers of HLA Alleles
HLA Class I Alleles 25,844
HLA Class II Alleles 10,970
HLA Alleles 36,814
Other non-HLA Alleles 805
Number of Confidential Alleles 3
HLA Class I
Gene A B C E F G
Alleles 8,012 9,573 7,995 350 91 157
Proteins 4,688 5,694 4,410 140 17 48
Nulls 414 338 353 10 2 6
HLA Class I - Pseudogenes
Gene H J K L N P S T U V W Y
Alleles 72 33 6 5 5 5 7 8 5 3 11 3
Proteins 0 0 0 0 0 0 0 0 0 0 0 0
Nulls 0 0 0 0 0 0 0 0 0 0 0 0
HLA Class II
Gene DRA DRB DQA1 DQA2 DQB1 DQB2 DPA1 DPA2 DPB1 DPB2 DMA DMB DOA DOB
Alleles 65 4,530 688 42 2,491 41 619 5 2,393 6 58 82 92 63
Proteins 14 2,983 337 11 1,516 9 297 0 1,399 0 9 9 14 16
Nulls 0 198 21 0 111 1 26 0 127 0 0 0 1 0
HLA Class II - DRB Alleles
Gene DRB1 DRB2 DRB3 DRB4 DRB5 DRB6 DRB7 DRB8 DRB9
Alleles 3,588 1 482 248 199 3 2 1 6
Proteins 2,315 0 363 157 148 0 0 0 0
Nulls 122 0 24 27 25 0 0 0 0
Other non-HLA Genes
Gene HFE MICA MICB TAP1 TAP2
Alleles 6 531 245 12 106
Proteins 4 280 47 6 13
Nulls 0 8 25 1 0