HLA Alleles Numbers

Assigned as of June 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 22,436
HLA Class II Alleles 8,462
HLA Alleles 30,862
Other non-HLA Alleles 654
Number of Confidential Alleles 0
HLA Class I
Gene A B C E F G
Alleles 6,921 8,181 6,779 271 45 88
Proteins 4,156 5,090 3,927 110 6 26
Nulls 357 285 298 7 0 5
HLA Class I - Pseudogenes
Gene H J K L N P S T U V W Y
Alleles 66 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 29 3,801 343 40 2,033 298 5 1,862 6 7 13 12 13
Proteins 2 2,620 172 11 1,324 135 2 1,180 3 4 7 3 5
Nulls 0 158 7 0 88 10 0 94 0 0 0 1 0
HLA Class II - DRB Alleles
Gene DRB1 DRB2 DRB3 DRB4 DRB5 DRB6 DRB7 DRB8 DRB9
Alleles 3,018 1 404 203 163 3 2 1 6
Proteins 2,063 0 301 131 125 0 0 0 0
Nulls 97 0 19 23 19 0 0 0 0
Other non-HLA Genes
Gene HFE MICA MICB TAP1 TAP2
Alleles 6 388 236 12 12
Proteins 6 192 42 6 5
Nulls 0 6 25 1 0