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HLA-A33



major histocompatibility complex (human), class I, A33
Alleles A*3301
A*3303
Structure (See HLA-A)
Identifiers
3301 3303
Symbol(s) HLA-A
EBI-HLA A*3301
EBI-HLA A*3303
Shared data
Locus chr.6 6p21.31

HLA-A33 (A33) is an HLA-A serotype. The serotype identifies the HLA-A*3301 gene product. A33 is a split antigen type of the A19 broad antigen type. A33 is common in India and certain parts of Africa.[1]

Contents

Serotype

A33, A19 serotype recognition of Some HLA A*33 allele-group gene products[2]
A*33 A33 A19 Sample
allele % % size (N)
3301 87 3 687
3303 95 807

A33 frequencies

HLA A*3301 frequencies
freq
ref. Population (%)
[3] Pakistan Karachi Parsi12.2
[4] Portugal North7.6
[5] Tunisia6.1
[6] Morocco Nador Metalsa5.5
[4] Mongolia Buriat4.6
[7] Guinea Bissau4.6
[8] Jordan Amman3.5
[7] Cape Verde NW Islands3.2
[4] Portugal Centre3.0
[9] Iran Baloch2.8
[10] Pakistan Baloch2.4
[4] France South East2.3
[4] Sudanese1.8
[4] Japan Okinawa Ryukuan1.8
[11] Mali Bandiagara1.8
[12] Bulgaria1.8
[10] Pakistan Kalash1.7
[11] Uganda Kampala1.5
[13] Georgia Svaneti1.3
[11] Kenya Luo1.3
[14] Oman1.3
[11] Zambia Lusaka1.2
[15] China Guangdong Meizhou1.0
[4] Romanian1.0
[4] Croatia1.0
[16] China Qinghai Hui0.9
[4] Czech Republic[17]0.9
[4] Kenya 0.7
[18] Ireland Northern0.7
[14] Singapore Chinese0.6
[19] Cameroon Bamileke0.6
[20] India North Delhi0.5
[4] Georgia Tibilisi0.5
[4] Belgium0.5
[19] Cameroon Beti0.3
[11] Kenya Nandi0.2

'A33 shows two different distributions that can be discriminated by subtyping capability of SSP-PCR.

A*3301 distribution

The first distribution appears to have a Western distribution that introgresses into Europe as a result of the Post-neolithic periods. It is commonly found in linkage disequilibration within the A*3301-Cw*0802-B*1402 haplotype which can be extended to DRB1 and DQB1 in certain instances(See Below). The source of its general expansion appears to be the middle east or the levant, as it is found in the Palestinian population. B14 splits into B64 (B*1401) and B65 (B*1402) but the only arabian people which show both antigens are the United Arab Emirates.

A*3303 distribution

HLA A*3303 frequencies
freq
ref. Population (%)
[19] Cameroon Baka25.0
[19] Cameroon Sawa23.1
[4] India West Bhils18.0
[10] Pakistan Burusho17.9
[21] South Korea (3)16.3
[4] India West Parsis14.0
[4] Singapore Thai13.3
[4] India Mumbai Marathas13.0
[22] Japan12.8
[10] Pakistan Baloch12.7
[4] China South Han11.5
[4] Singapore Riau Malay10.9
[14] Singapore Chinese10.1
[4] Hong Kong Chinese10.0
[23] Chaoshan 9.8
[11] Mali Bandiagara9.4
[16] China Inner Mongolia9.3
[4] Singapore Chinese Han9.3
[4] Singapore Javan9.0
[24] India North Hindus8.7
[7] Guinea Bissau8.5
[4] Taiwan Minnan8.3
[4] Taiwan Hakka8.2
[25] Senegal Mandenka8.1
[10] Pakistan Brahui8.0
[10] Pakistan Sindhi7.6
[4] Russia Tuvan7.1
[10] Pakistan Pathan7.1
[4] South Africa Natal Tamil7.0
[3] Pakistan Karachi Parsi6.7
[26] India Tamil Nadu Nadar6.6
[4] Israel Jews6.4
[4] India Andhra Pradesh Golla6.3
[27] China North Han6.2
[28] China Beijing Tianjian6.2
[20] India New Delhi6.1
[10] Pakistan Kalash5.8
[9] Iran Baloch5.6
[16] China Qinghai Hui5.5
[4] China Guangzhou5.4
[19] Cameroon Bamileke4.5
[29] China Yunnan Nu4.4
[4] China Guangxi Maonan4.2
[15] China Guangdong Meizhou4.0
[7] Cape Verde SW Islands4.0
[4] Taiwan Pazeh3.6
[4] Uganda Kampala3.1
[4] China Beijing3.0
[4] India Khandesh Pawra3.0
[19] Cameroon Yaounde2.8
[4] Sudanese2.5
[4] Zimbabwe Harare Shona2.4
[7] Cape Verde NW Islands2.4
[19] Cameroon Beti2.3
[14] Oman2.1
[30] China Tibet1.6
[4] Croatia1.3
[4] Romanian1.2
[29] China Yunnan Lisu1.1
[4] Arab Druse1.0
[4] Georgia Tibilisi1.0
[4] Belgium1.0
[11] Kenya Luo0.9
[31] Lakota Sioux0.5
[4] Australian Indig. Cape York0.5
[5] Tunisia0.5
[14] South Africian Natal Zulu0.5
[4] Kenya 0.3
[18] Ireland Northern0.3
[11] Kenya Nandi0.2

Certain alleles confound population histories. At the top of that list is A*3303. This allele appears to jump, literally, out of West Africa into South Asia. The point of origin is africa, most likely central or western Africa given the low levels in East Africa (although much of East Africa is undersampled). In certain tested populations of the Middle East the leve of A*3303 is either very low, or non-existent. Within East Africa Sudan appears to be the highest at around 2%. The frequency of A*3303 begins to rise in eastern Arabia (Oman, UAE) and then markedly rise in the Brahui and Balochi of Pakistan. One haplotype stands out, the A33-B58-DR3-DQ2 haplotype which is found in West Africa, in Sudan, and Pakistan, scattered along West Indias coast, the Turkic republics and appears to have recently introgressed into Korea (post-Yayoi period of Japan) and China. So recent arrival into asia that the level of HLA DR3-DQ2 in korea of 2.9%. Korea is the major recent source of Japanese genes, by the Yayoi period that lasted from 3000 to 1600 years ago approximately 3/4ths of Japanese genetic makeup is attributed to this migration. And yet there is trace DR3-DQ2 in Japanese, none in the Ainu nor many other indigeonous Siberian groups.

A33 Haplotypes

A33-Cw8-B14-DR1-DQ5

HLA A*33-B14 frequencies
freq
ref. Population (%)
[3] Parsis (Pakistan)4.4
[32] Sardinian3.0
India West Coast Parsis 3.3 [33]
[32] Portuguese2.7
[32] Armenian2.5
[32] Indian2.0
[32] Polish2.0
Ashkenazi Jews1.8
[32] French1.8
[32] Panish1.7
[32] Albanian1.5
[32] German1.5
[32] Tuscan1.3
[32] Greek1.1
[32] Marathans1.1
[32] Italian1.0
[34] Palestinian0.9

When dealing with haplotypes, if one assumes that linkage disequilibrium is random, then one can estimate the time of equilibration based on the size of the haplotype, the A-B-DR haplotype is over 2 million nucleotides in length. Given this length it is unlikely it spread during the Neolithic period. A more like guess as to when it spread was the early historic period, with the spread of the Phonecian and Mycenaean culture throughout the mediterranean. Its presence in India, particularly northern India, indicates possible spread of this haplotype within the Black Sea region prior to the migration of Indo-Aryan culture across the Indus River. The specific nomenclature for this type is:

A*3301 : C*0802 : B*1402 : DRB1*0102 : DQA1*0102 : DQB1*0501




A33-B44

HLA A*33-B44 frequencies[32]
freq
ref. Population (%)
Iyers9.6
Korea8.0
Japan6.1
Thais4.7
[3] Parsis (Pakistan)4.4
Bharghavas4.0
Java3.7
Tribals (India)3.0
Chinese (Thailand)2.8
Vietnamese2.7

This haplotype appears to precede A33-B58 in Asia, bringing with it the DR7-DQ2 haplotype. There are two versions of the haplotype, possibly of different origins, its a good reason why serotyping alone should not be relied upon. The first haplotype is A33-Cw14-B44-DR13-DQ6.4[35]

A*3303 : C*1403 : B*4403 : DRB1*1302 : DQA1*0102 : DQB1*0604 : DPB1*0401

This haplotype is found in Japan and Korea, and it is the most common 5 locus HLA type in Korea, high at 4.2%, 25 times higher than in China. In Japan it is 4.8% and can be extended to DPB1 at 3.6%. While clearly not showing the level of disequilibrium of the Super B8 haplotype, the level of disequilibrium is high, indicating an expansive migration into these regions at some time in the recent past, most likely in the period precedeing the Yayoi period of Japan.

A*3303 : C*0701 : B*4403 : DRB1*0701 : DQA1*0201? : DQB1*0202

The second haplotype, like A33-B58 is found in Korea but not in Japan.[21] This haplotype carries the other common DQ2 haplotype, DQ2.2. The Cw*0701 is found in the A*33-B58 haplotype and is like the result of a recombination betwee A33-Cw7 and a different B44-DR7 haplotype. These haplotypes indicate that interpreting population relationships by allele or even by low resolution haplotype information is error-prone and suggests the need for high resolution multigene haplotype studies.

A33-Cw3-B58-DR3-DQ2

HLA A*33-B58 frequencies
freq
ref. Population (%)
[32] Chinese (Thailand)12.6
[10] Baloch (Pakistan)11.1
[23] Chaoshan (China)8.1
[32] Chinese (Singapore)5.5
[10] Burusho (Pakistan)4.6
[32] Hui4.0
[32] Mongolian3.7
[10] Kalash (Pakistan)3.6
[32] Korea3.5
[32] Yaku3.2
[10] Panthan (Pakistan)3.0
[32] Tribals (India)3.0
Baloch (SE Iran)2.9
[10] Brahui (Pakistan)2.9
[32] Southern Han2.8
[32] Thais2.5
[32] Vietnamese2.3
[32] Inner Mongolian2.2
[32] Miao2.1
[32] West African 2.1
[32] South African1.9
[36] Oman1.6
[10] Sindhi (Pakistan)1.5
[32] Manchu1.2
[37]Sudan1.2
Cameroon Yaounde[38]1.1

Within eastern Asia A*3303 is in linkage disiquilbrium with on haplotype in particular, the specific genetic makeup is:

A*3303 : C*0302 : B*5801 : DRB1*0301 : DQA1*0501 : DQB1*0201

It is interesting that the Cw allele in the pakistani population is the same as the allele in the east asian population C*0302. 8.3 of 11.1% of the A33-B58 in the Baloch Pakistani can is linked to DR3 and presumbably DQ2.5 (There are few exceptions outside of Africa). This extends a haplotype the forms a semi-circle around the Indian subcontinent indicating a subsantive and relatively recent genetic relationship. The parsis of Pakistan lack A33-B58, as with groups to the far west of pakistan. The A33-B58-DR3-DQ2 haplotype appears to have originated in whole from West Africa, with current possibilities for Sudan or Northern Ethiopia as points of exit from africa and a migration by the Indian ocean to the western side of the Indus River.

A33-Cw7-B58-DR13-DQ6

Within eastern Asia A*3303 is in linkage disiquilbrium with on haplotype in particular, the specific genetic makeup is:

A*3303 : C*0701 : B*5801 : DRB1*1302 : DQA1*0102 : DQB1*0609

This haplotype is composed of genes most frequent in parts of western Africa. This includes the A*3303, B*5801, DRB1*1302, and DQB1*0609. The DRB1*0609 haplotype in nodal in east/central africa in the Ugandan, Rwanda, Congo, Cameroon whereas the allele is at low frequencies in Western Europe, and its distribution is also consistent with a migration from east africa direct to the Lower Indus River.

References

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  2. ^ derived from IMGT/HLA
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  31. ^ Leffell MS, Fallin MD, Hildebrand WH, Cavett JW, Iglehart BA, Zachary AA (2004). "HLA alleles and haplotypes among the Lakota Sioux: report of the ASHI minority workshops, part III". Hum. Immunol. 65 (1): 78–89. PMID 14700599.
  32. ^ a b c d e f g h i j k l m n o p q r s t u v w x y z aa ab ac Sasazuki, Takehiko; Tsuji, Kimiyoshi; Aizawa, Miki (1992). HLA 1991: proceedings of the eleventh International Histocompatibility Workshop and Conference, held in Yokohama, Japan, 6-13 November, 1991. Oxford [Oxfordshire]: Oxford University Press. ISBN 0-19-262390-7. 
  33. ^ bears the C*0502 instead of the C*0802 otherwise seen with this haplotype
  34. ^ Arnaiz-Villena A, Elaiwa N, Silvera C, et al (2001). "The origin of Palestinians and their genetic relatedness with other Mediterranean populations". Hum. Immunol. 62 (9): 889–900. PMID 11543891.
  35. ^ Saito S, Ota S, Yamada E, Inoko H, Ota M (2000). "Allele frequencies and haplotypic associations defined by allelic DNA typing at HLA class I and class II loci in the Japanese population". Tissue Antigens 56 (6): 522–9. PMID 11169242.
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  37. ^ Ward FE, Jensen JB, Abdul Hadi NH, Stewart A, Vande Waa JV, Bayoumi RA (1989). "HLA genotypes and variant alleles in Sudanese families of Arab-Negroid tribal origin". Hum. Immunol. 24 (4): 239–51. PMID 2708086.
  38. ^ bears the A*3303:B*5802
v • d • e
HLA-A Serotypes
HLA-A - A1 - A2 - A3 - A9 (A23 - A24) - A10 (A25 - A26 - A34 - A43 - A66) - A11 - A19 (A29 - A30 - A31 - A32 - A33 - A74) - A28 (A68 - A69) - A36 - A80
 
This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "HLA-A33". A list of authors is available in Wikipedia.
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