Genetic impact of a butyrophilin-like 2 (BTNL2) gene variation on specific IgE responsiveness to Dermatophagoides farinae (Der f) in Japanese.
BACKGROUND
Dermatophagoides farinae (Der f) is one of the most frequently implicated allergens in several allergic diseases. Several genome-wide screens have identified a linkage between chromosome 6p21 and mite-specific IgE responsiveness. Butyrophilin-like 2 (BTNL2) is a member of the immunoglobulin superfamily and, on the basis of its homology to B7-1, has been implicated as a costimulatory molecule involved in T-cell activation. BTNL2 resides in the HLA region on chromosome 6p21, and significant associations between BTNL2 gene polymorphisms and several inflammatory diseases have been reported.


OBJECTIVE
The aim of this study was to examine whether BTNL2 gene polymorphisms are associated with specific IgE responses to Der f.


METHODS
Three single nucleotide polymorphisms (SNPs), including 2 coding SNPs and 1 intron SNP, were studied. One of the coding SNPs was the rs2076530 A > G, which has a functional consequence. A total of 863 unrelated Japanese subjects (447 positive and 416 negative for IgE to Der f) were recruited for a case-control study.


RESULTS
Controlling for gender, age, smoking, and the presence of asthma, multiple logistic regression analyses showed that homozygosity of the rs2076530 A allele, which has been reported to be a risk allele for sarcoidosis, was associated with a risk of sensitization towards Der f (Odds ratio; 1.55, p = 0.0060).


CONCLUSIONS
Although an association which may be due to the linkage disequilibrium with other genes in 6p21 needs to be ruled out, the present findings suggest that the BTNL2 gene might be one of the candidate genes that is responsible for the pathogenesis of Der f-specific IgE responsiveness.
Konno
Satoshi
S
First Department of Medicine, Hokkaido University School of Medicine, Hokkaido, Japan. satkonno@med.hokudai.ac.jp
Takahashi
Daisuke
D
Hizawa
Nobuyuki
N
Hattori
Takeshi
T
Takahashi
Ayumu
A
Isada
Akira
A
Maeda
Yukiko
Y
Huang
Shau-Ku
SK
Nishimura
Masaharu
M
D000293:Adolescent; D000328:Adult; D000368:Aged; D000818:Animals; D000071797:Butyrophilins; D040001:Dermatophagoides farinae / Q000276:immunology*; D005260:Female; D005802:Genes, MHC Class II; D006239:Haplotypes; D006801:Humans; D007073:Immunoglobulin E / Q000097:blood*; D008297:Male; D008562:Membrane Glycoproteins / Q000235:genetics*; D008875:Middle Aged; D020641:Polymorphism, Single Nucleotide
C408263:BTNL2 protein, human; D000071797:Butyrophilins; D008562:Membrane Glycoproteins; D007073:Immunoglobulin E