Volume 51, Issue 1 pp. 32-38
ORIGINAL ARTICLE

Leukocyte immunoglobulin-like receptor A3 gene deletion in five Chinese populations and protective association with nasopharyngeal carcinoma

Wei Tian

Corresponding Author

Wei Tian

Department of Immunology, College of Basic Medical Sciences, Central South University, Changsha, China

Laboratory of Cellular and Molecular Biology, College of Basic Medical Sciences, Central South University, Changsha, China

Correspondence

Professor Wei Tian, Department of Immunology & Laboratory of Cellular and Molecular Biology, College of Basic Medical Sciences, Central South University, Changsha, Hunan, China.

Email: [email protected]

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Li Xin Li

Li Xin Li

Laboratory of Cellular and Molecular Biology, College of Basic Medical Sciences, Central South University, Changsha, China

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Wen Cheng

Wen Cheng

Department of Immunology, College of Basic Medical Sciences, Central South University, Changsha, China

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He Kun Jin

He Kun Jin

Department of Radiotherapy, Hunan Cancer Hospital (the affiliated Cancer Hospital of XiangYa School of Medicine of Central South University), Changsha, China

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Sha Shuang Zhang

Sha Shuang Zhang

Laboratory of Cellular and Molecular Biology, College of Basic Medical Sciences, Central South University, Changsha, China

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First published: 28 November 2023
Citations: 1

Wei Tian and Li Xin Li are co-first authors.

Abstract

Among the thirteen leukocyte Ig-like receptor (LILR) loci located at 19q13.4, LILRA3 is unique in that it encodes a soluble protein lacking the transmembrane and cytoplasmic domains, and a 6.7 kb deletion spanning the first seven exons has been detected in some human individuals. Presently, there is a lack of data about the distribution of LILRA3 gene deletion in more diverse ethnic groups. Also, no previous studies have investigated the correlation between copy number variation (CNV) of LILRA3 and nasopharyngeal carcinoma (NPC). In this study, five populations from China mainland: two Southern Han populations, Hunan (N = 1478) and Guandong (N = 107); one Southeastern Han population, Fujian (N = 439); and two Northern populations, Inner Mongolia Han (N = 104) and Mongol population from Inner Mongolia (N = 158) were investigated for CNV of LILRA3 using polymerase chain reaction-sequence-specific priming (PCR-SSP) method. LILRA3 variants were also examined in a cohort of NPC cases (N = 1142) in Hunan Han population. The five Chinese populations demonstrated northward increase in frequency of the deleted form of LILRA3 gene (LILRA3*Del) (all corrected p values < 0.05). Inter-population comparison also uncovered significant differentiation in the distribution of CNV of LILRA3 among modern human populations. LILRA3*Del was found to confer significantly reduced risk to NPC in Hunan Han population (at allelic level: OR = 0.79, 95% CI = 0.71–0.89, p < 0.0001; at genotype level: OR = 0.63, 95% CI = 0.51–0.79, p < 0.0001). No interaction was found between LILRA3 variants and HLA-A*02:07, HLA-A*11:01, HLA-B*13 and HLA-B*46:01 alleles in susceptibility to NPC. Our study constitutes the first demonstration of LILRA3 gene as a locus linked to NPC susceptibility in a southern Chinese population. Future independent studies in other populations are warranted to confirm the findings reported in this study.

CONFLICT OF INTEREST STATEMENT

The authors declare no conflicts of interest.

DATA AVAILABILITY STATEMENT

The data that support the findings of this study are available from the corresponding author upon reasonable request.

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