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The HLA genes and their diverse polymorphism

  • Immunology
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Indian Journal of Clinical Biochemistry Aims and scope Submit manuscript

Abstract

Advanced DNA level studies based on HLA class II sequence analysis have revealed considerable diversity in HLA among Asian Indians. High resolution typing of specific alleles such as DR2 and DR4 in the HLA class II region by PCR-SSP or SSOP hybridization and their associated DR-DQ haplotypes have helped to detect unique haplotypes and novel alleles which have subsequently been confirmed by sequencing. Incidentally, remarkable stability has been maintained in several other DRB1 alleles viz. DR1, DR7, DR9 and DR10. The ARMS-PCR technology has been found to be particularly useful for typing HLA-A, HLA-B and HLA-Cw alleles. These technologies are far superior over serological methods. Our studies have shown remarkable heterogeneity of common HLA-A and B alleles in Asian Indians. Molecular subtyping of HLA-A2 revealed that subtype A*0211 is found only in Indian population and may be the result of selection pressure in this population. Investigations into polymorphism in the HLA-B27 gene revealed that subtypes common both to the western caucasians and orientals occur in the Indian population. It is apparent that the population of the Indian subcontinent, placed as it is between the Caucasoids and Negroids on one hand and Australoids and Mongoloids on the other, provides a rich source of many HLA haplotypes. While the most frequent Caucasian haplotypes occur with a reasonable frequency in Asian Indians, those found predominantly in other ethnic groups (e.g., australian Aborigines and populations of Oceania, China and Japan) are also detected. Knowledge on this is most important for donor selection during organ and bone marrow transplantation and for designing MHC targeted vaccines in specific diseases.

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  1. Department of Histocompatibility & Immunogenetics, All India Institute of Medical Sciences, Ansari Nagar, 110029, New Delhi

    N. K. Mehra (Head)

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  1. N. K. Mehra
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Correspondence to N. K. Mehra.

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Mehra, N.K. The HLA genes and their diverse polymorphism. Indian J Clin Biochem 15 (Suppl 1), 65–77 (2000). https://doi.org/10.1007/BF02867546

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