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Open Access Highly Accessed Case report

Association of HLA class I with severe acute respiratory syndrome coronavirus infection

Marie Lin1, Hsiang-Kuang Tseng2, Jean A Trejaut1, Hui-Lin Lee1, Jun-Hun Loo1, Chen-Chung Chu1, Pei-Jan Chen2, Ying-Wen Su2, Ken Hong Lim2, Zen-Uong Tsai1, Ruey-Yi Lin3, Ruey-Shiung Lin4 and Chun-Hsiung Huang5*

Author Affiliations

1 Transfusion Medicine Laboratory, Mackay Memorial Hospital, Taipei, Taiwan

2 Department of Internal Medicine, Mackay Memorial Hospital, Taipei, Taiwan

3 Taipei Municipal Hoping Hospital, Taipei, Taiwan

4 Institute of Preventive Medicine, National Taiwan University, Taipei, Taiwan

5 Office of Director, Mackay Memorial Hospital, Taipei, Taiwan

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BMC Medical Genetics 2003, 4:9  doi:10.1186/1471-2350-4-9

Published: 12 September 2003

Abstract

Background

The human leukocyte antigen (HLA) system is widely used as a strategy in the search for the etiology of infectious diseases and autoimmune disorders. During the Taiwan epidemic of severe acute respiratory syndrome (SARS), many health care workers were infected. In an effort to establish a screening program for high risk personal, the distribution of HLA class I and II alleles in case and control groups was examined for the presence of an association to a genetic susceptibly or resistance to SARS coronavirus infection.

Methods

HLA-class I and II allele typing by PCR-SSOP was performed on 37 cases of probable SARS, 28 fever patients excluded later as probable SARS, and 101 non-infected health care workers who were exposed or possibly exposed to SARS coronavirus. An additional control set of 190 normal healthy unrelated Taiwanese was also used in the analysis.

Results

Woolf and Haldane Odds ratio (OR) and corrected P-value (Pc) obtained from two tails Fisher exact test were used to show susceptibility of HLA class I or class II alleles with coronavirus infection. At first, when analyzing infected SARS patients and high risk health care workers groups, HLA-B*4601 (OR = 2.08, P = 0.04, Pc = n.s.) and HLA-B*5401 (OR = 5.44, P = 0.02, Pc = n.s.) appeared as the most probable elements that may be favoring SARS coronavirus infection. After selecting only a "severe cases" patient group from the infected "probable SARS" patient group and comparing them with the high risk health care workers group, the severity of SARS was shown to be significantly associated with HLA-B*4601 (P = 0.0008 or Pc = 0.0279).

Conclusions

Densely populated regions with genetically related southern Asian populations appear to be more affected by the spreading of SARS infection. Up until recently, no probable SARS patients were reported among Taiwan indigenous peoples who are genetically distinct from the Taiwanese general population, have no HLA-B* 4601 and have high frequency of HLA-B* 1301. While increase of HLA-B* 4601 allele frequency was observed in the "Probable SARS infected" patient group, a further significant increase of the allele was seen in the "Severe cases" patient group. These results appeared to indicate association of HLA-B* 4601 with the severity of SARS infection in Asian populations. Independent studies are needed to test these results.