• Soo Yeon Kim, Eun Gyul Kim, Mina Kim, Jung Yeon Hong, Ga Eun Kim, Jae Hwa Jung, Mireu Park, Min Jung Kim, Yoon Hee Kim, Myung Hyun Sohn, and Kyung Won Kim.
• Department of Pediatrics, Severance Hospital, Institute of Allergy, Brain Korea 21 Project for Medical Science, Yonsei University College of Medicine, Seoul, Republic of Korea.
• Medicine (Baltimore). 2021 Nov 5; 100 (44): e27626e27626.

AbstractAsthma is a heterogeneous disease characterized by chronic airway inflammation with a genetic predisposition. Butyrophilin-like 2 (BTNL2) is a member of the immunoglobulin superfamily that plays an important role in regulating T cell activation and immune homeostasis. Here, we aimed to investigate the association of the genetic variants of BTNL2 with childhood asthma and asthma-related traits by utilizing extreme asthma phenotypes and employing a genome-wide association study. Our study included 243 children with well-defined moderate to severe atopic asthma and 134 healthy children with no history of allergic diseases and allergic sensitization. DNA from these subjects was genotyped using AxiomTM Genome-Wide Array Plates. Although no single nucleotide polymorphisms (SNPs) reached a genome-wide threshold of significance, 3 SNPs, rs3817971, rs41355746, and rs41441651, at BTNL2 were significantly associated with moderate to severe atopic asthma after performing Bonferroni correction. These SNPs were also associated with the risk of allergic sensitization toward house dust mites and the presence and degree of bronchial hyperresponsiveness. Thus, we identified that BTNL2 was associated with atopic moderate to severe persistent asthma in Korean children, and this may play an important role in disease development and susceptibility.Copyright © 2021 the Author(s). Published by Wolters Kluwer Health, Inc.

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