HLA Alleles Numbers

Assigned as of September 2021

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 23,002
HLA Class II Alleles 8,673
HLA Alleles 31,675
Other non-HLA Alleles 655
Number of Confidential Alleles 0
HLA Class I
Gene A B C E F G
Alleles 7,114 8,464 6,855 278 47 92
Proteins 4,233 5,240 3,953 111 6 28
Nulls 366 293 301 7 0 5
HLA Class I - Pseudogenes
Gene H J K L N P S T U V W Y
Alleles 67 27 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 DPA1 DPA2 DPB1 DPB2 DMA DMB DOA DOB
Alleles 32 3,841 363 40 2,136 315 5 1,890 6 7 13 12 13
Proteins 5 2,644 185 11 1,366 147 2 1,191 3 4 7 3 5
Nulls 0 164 8 0 92 10 0 94 0 0 0 1 0
HLA Class II - DRB Alleles
Gene DRB1 DRB2 DRB3 DRB4 DRB5 DRB6 DRB7 DRB8 DRB9
Alleles 3,045 1 411 209 163 3 2 1 6
Proteins 2,079 0 306 134 125 0 0 0 0
Nulls 103 0 19 23 19 0 0 0 0
Other non-HLA Genes
Gene HFE MICA MICB TAP1 TAP2
Alleles 6 388 237 12 12
Proteins 4 192 42 6 5
Nulls 0 6 25 1 0