Abstract
Human leukocyte antigen (HLA) genes control the regulation of the human immune system and are involved in immune-related diseases. Population surveys on relationships between single nucleotide polymorphisms (SNP) and HLA alleles are essential to conduct genetic association between HLA variants and diseases. Samples were obtained from our in-house database for epilepsy genetics and pharmacogenetics research. Using 184 epilepsy patients with both genome-wide SNP array and HLA-A/B candidate gene sequencing data, we sought tagging SNPs that completely represent sixHLA risk alleles; in addition, a Hong Kong population-specific reference panel was constructed for SNP-based HLA imputation. The performance of our new panel was compared to a recent Han Chinese panel. Finally, genetic associations of HLA variants with mild skin rash were performed on the combined sample of 408 patients. Common SNPs rs2571375 and rs144295468 were found to successfully tag HLA risk alleles A*31:01 and B*13:01, respectively. HLA-B*15:02 can be predicted by rs144012689 with >95% sensitivity and specificity. The imputation reference panel for the Hong Kong population had comparable performance to the Han Chinese panel due to the large sample size for common HLA alleles, though it retained discordance for imputing rare alleles. No significant genetic associations were found between HLA genetic variants and mild skin rash induced by aromatic antiepileptic drugs. This study provides new information on the genetic structure of HLA regions in the Hong Kong population by identifying tagging SNPs and serving as a reference panel. Moreover, our comprehensive genetic analyses revealed no significant association between HLA alleles and mild skin rash in Hong Kong Han Chinese.
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Acknowledgements
This project is supported by the Hong Kong Health and Medical Research Fund (HMRF 01120186 grant to Patrick Kwan) and General Research Fund (HKU 7623/08M and HKU 7630/12M grants to Stacey Cherny). We would like to give special thanks to Drs Wanling Yang and Ching-Lung Cheung from the Centre for Genomic Sciences at the University of Hong Kong, and Mark McCormack from the Royal College of Surgeons of Ireland for their advice on HLA analysis. We thank all the neurologists who recruited the patients, and the patients for participating in the study.
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Gui, H., Kwok, M., Baum, L. et al. SNP-based HLA allele tagging, imputation and association with antiepileptic drug-induced cutaneous reactions in Hong Kong Han Chinese. Pharmacogenomics J 18, 340–346 (2018). https://doi.org/10.1038/tpj.2017.11
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DOI: https://doi.org/10.1038/tpj.2017.11
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