TY - JOUR
T1 - Association of atopy and eczema with polymorphisms in T-cell immunoglobulin domain and mucin domain - IL-2-inducible T-cell kinase gene cluster in chromosome 5q33
AU - Graves, Penelope E.
AU - Siroux, Valérie
AU - Guerra, Stefano
AU - Klimecki, Walter T.
AU - Martinez, Fernando D.
PY - 2005/9
Y1 - 2005/9
N2 - Background: The T-cell immunoglobulin domain and mucin domain (TIM) gene family and the gene for IL-2-inducible T-cell kinase (ITK), located in chromosome 5q33 and potentially involved in the T-cell proliferation and differentiation, are good candidate genes for allergic diseases. Objective: We assessed the role of polymorphisms in the TIM family genes and ITK in atopy, eczema, and asthma. Methods: Twenty-one polymorphisms in the TIM-ITK gene cluster were genotyped in 564 children enrolled in the Tucson Children's Respiratory Study. Skin prick tests to common allergens were performed at age 6.1 years (n = 508), age 10.8 years (n = 539), and age 16.6 years (n = 424). Asthma and eczema were assessed by questionnaire at these 3 points. Averaged relative risks were estimated. Results: One 15-bp insertion/deletion in exon 4 of TIM1 was significantly related to atopy and eczema (relative risk associated with carrying at least 1 rare allele = 1.24 [1.07-1.45], P = .005; and 1.43 [1.01-2.01], P = .004, respectively). The 3 tested single nucleotide polymorphisms (SNPs) in TIM3 were significantly related to atopy and eczema. One of them, at position +4259 calculated from the translation start site, predicts a putative change in the amino acid sequence of the protein, and was the most strongly related to atopy (relative risk = 1.28 [1.12-1.47]; P = .0003). SNPs in the 5′ genomic region in ITK, which show moderate linkage disequilibrium with those in TIM3, had an independent effect on atopy. None of the polymorphisms studied was related to asthma. Conclusion: Our findings support a potential role for SNPs in TIM1, TIM3, and ITK, independent of each other, in allergic diseases.
AB - Background: The T-cell immunoglobulin domain and mucin domain (TIM) gene family and the gene for IL-2-inducible T-cell kinase (ITK), located in chromosome 5q33 and potentially involved in the T-cell proliferation and differentiation, are good candidate genes for allergic diseases. Objective: We assessed the role of polymorphisms in the TIM family genes and ITK in atopy, eczema, and asthma. Methods: Twenty-one polymorphisms in the TIM-ITK gene cluster were genotyped in 564 children enrolled in the Tucson Children's Respiratory Study. Skin prick tests to common allergens were performed at age 6.1 years (n = 508), age 10.8 years (n = 539), and age 16.6 years (n = 424). Asthma and eczema were assessed by questionnaire at these 3 points. Averaged relative risks were estimated. Results: One 15-bp insertion/deletion in exon 4 of TIM1 was significantly related to atopy and eczema (relative risk associated with carrying at least 1 rare allele = 1.24 [1.07-1.45], P = .005; and 1.43 [1.01-2.01], P = .004, respectively). The 3 tested single nucleotide polymorphisms (SNPs) in TIM3 were significantly related to atopy and eczema. One of them, at position +4259 calculated from the translation start site, predicts a putative change in the amino acid sequence of the protein, and was the most strongly related to atopy (relative risk = 1.28 [1.12-1.47]; P = .0003). SNPs in the 5′ genomic region in ITK, which show moderate linkage disequilibrium with those in TIM3, had an independent effect on atopy. None of the polymorphisms studied was related to asthma. Conclusion: Our findings support a potential role for SNPs in TIM1, TIM3, and ITK, independent of each other, in allergic diseases.
KW - Asthma
KW - Atopy
KW - Eczema
KW - ITK
KW - Polymorphisms
KW - TIM
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UR - http://www.scopus.com/inward/citedby.url?scp=24644514025&partnerID=8YFLogxK
U2 - 10.1016/j.jaci.2005.05.004
DO - 10.1016/j.jaci.2005.05.004
M3 - Article
C2 - 16159638
AN - SCOPUS:24644514025
SN - 0091-6749
VL - 116
SP - 650
EP - 656
JO - Journal of Allergy and Clinical Immunology
JF - Journal of Allergy and Clinical Immunology
IS - 3
ER -