HLA-B47




major histocompatibility complex (human), class I, B47
Alleles	B4701 B4702 B*4703
Structure (See HLA-B)
Symbol(s)	HLA-B
EBI-HLA	B*4701
EBI-HLA	B*4702
EBI-HLA	B*4703
Locus	chr.6 6p21.31

HLA-B47 (B47) is an HLA–B serotype. The serotype identifies the HLA-B*47 gene products (B*4701, B*4702, B*4703) .^[1] Comparison of B47 nucleotide sequence with other HLA-B sequences shows a segment of 228 bp identical with B44 in the alpha 1 domain and a segment of 218 bp identical with B27 in the alpha 2 domain, but only a 91 bp segment of identity with B13 in the alpha 1 domain. The complex pattern of substitutions and their degree of divergence indicate that HLA-B13 and HLA-Bw47 alleles are not related by a simple mutational event.^[2] B47 is linked to (close to on the chromosome) a gene that causes adrenal deficiency. B47 is generally low in frequency and with highest known frequencies in Central and Western Africa. (For terminology help see: HLA-serotype tutorial)

Serotype

B47 serotype recognition of Some HLA B*47 allele-group gene products^[3]
B*47	B47	Other	Sample
allele	%	%	size (N)
4701	50	37	317
4702	40	40	5
4703	25	50	4

Serotyping for B47 is poor and typing is best performed with SSP-PCR or gene sequencing.

Disease Associations

B47 is linked to Adrenal 21-hydroxylase deficiency.^[2] The CYP21 gene is located close to B47 between HLA-B and HLA-DRB1 locus.

B*4701 frequencies

**HLA B*4701 frequencies**
		freq
ref.	Population	(%)
^[4]	Bamileke (Cameroon)	2.6
^[4]	Zapotec (Oaxaca, Mexico)	2.2
^[4]	Niokholo Mandinka (Senegal)	1.6
^[4]	Mbenzele Pygmy (CAR)	1.5
^[4]	Nandi (Kenya)	1.3
^[4]	Sudanese	1.3
^[4]	Yaoundé City (Cameroon)	1.1
^[4]	Lusaka (Zambia)	1.1
^[4]	Central Portugal	1.0
^[4]	Bulgaria	0.9
^[4]	Czech Republic	0.9
^[4]	Cape Verde Islands	0.8
^[4]	Berber (Morocco)	0.7
^[4]	Finland	0.6
^[4]	Svans (Georgia)	0.6
^[4]	Bergamo (Italy)	0.6
^[4]	Romanians	0.6
^[4]	North Delhi ((India))	0.5
^[4]	Orkney Isles (Scotland)	0.5
^[4]	Basque (Gipuzkoa, Spain)	0.5
^[4]	Southeastern (France)	0.4
^[4]	Oman	0.4
^[4]	Kenya	0.3

Regions of Africa with Higher B4701 frequencies
Orange = 1 to 3%
Yellow = 0.1 to 1%

References

^ Marsh, S. G.; Albert, E. D.; Bodmer, W. F.; Bontrop, R. E.; Dupont, B.; Erlich, H. A.; Fernández-Viña, M.; Geraghty, D. E.; Holdsworth, R.; Hurley, C. K.; Lau, M.; Lee, K. W.; Mach, B.; Maiers, M.; Mayr, W. R.; Müller, C. R.; Parham, P.; Petersdorf, E. W.; Sasazuki, T.; Strominger, J. L.; Svejgaard, A.; Terasaki, P. I.; Tiercy, J. M.; Trowsdale, J. (2010). "Nomenclature for factors of the HLA system, 2010". Tissue Antigens. 75 (4): 291–455. doi:10.1111/j.1399-0039.2010.01466.x. PMC 2848993. PMID 20356336.
^ ^a ^b Zemmour J, Ennis PD, Parham P, Dupont B (1988). "Comparison of the structure of HLA-B47 to HLA-B13 and its relationship to 21-hydroxylase deficiency". Immunogenetics. 27 (4): 281–7. doi:10.1007/BF00376123. PMID 3257938.
^ derived from IMGT/HLA
^ ^a ^b ^c ^d ^e ^f ^g ^h ⁱ ^j ^k ^l ^m ⁿ ^o ^p ^q ^r ^s ^t ^u ^v ^w Middleton D, Menchaca L, Rood H, Komerofsky R (2003). "New allele frequency database". Tissue Antigens. 61 (5): 403–7. doi:10.1034/j.1399-0039.2003.00062.x. PMID 12753660.

[pmid15787720-1] Marsh, S. G.; Albert, E. D.; Bodmer, W. F.; Bontrop, R. E.; Dupont, B.; Erlich, H. A.; Fernández-Viña, M.; Geraghty, D. E.; Holdsworth, R.; Hurley, C. K.; Lau, M.; Lee, K. W.; Mach, B.; Maiers, M.; Mayr, W. R.; Müller, C. R.; Parham, P.; Petersdorf, E. W.; Sasazuki, T.; Strominger, J. L.; Svejgaard, A.; Terasaki, P. I.; Tiercy, J. M.; Trowsdale, J. (2010). "Nomenclature for factors of the HLA system, 2010". Tissue Antigens. 75 (4): 291–455. doi:10.1111/j.1399-0039.2010.01466.x. PMC 2848993. PMID 20356336.

[pmid3257938-2] Zemmour J, Ennis PD, Parham P, Dupont B (1988). "Comparison of the structure of HLA-B47 to HLA-B13 and its relationship to 21-hydroxylase deficiency". Immunogenetics. 27 (4): 281–7. doi:10.1007/BF00376123. PMID 3257938.

[3] rived from IMGT/HLA

[pmid12753660-4] ^ ^a ^b ^c ^d ^e ^f ^g ^h ⁱ ^j ^k ^l ^m ⁿ ^o ^p ^q ^r ^s ^t ^u ^v ^w Middleton D, Menchaca L, Rood H, Komerofsky R (2003). "New allele frequency database". Tissue Antigens. 61 (5): 403–7. doi:10.1034/j.1399-0039.2003.00062.x. PMID 12753660.

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