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. 1999 Apr;36(4):323–325.

Association of a lymphotoxin α gene polymorphism and atopy in Italian families

E Trabetti 1, C Patuzzo 1, G Malerba 1, R Galavotti 1, L C Martinati 1, A Boner 1, P F Pignatti 1
PMCID: PMC1734358  PMID: 10227402

Abstract

Tumour necrosis factor (TNF) is a proinflammatory cytokine that increases human airway tissue responsiveness and is considered a candidate gene for asthma. Two common polymorphisms (LTαNcoI and TNFα-308) in the TNF gene complex were studied in 600 subjects from 131 Italian families with atopic asthmatic children. Skin prick test (SPT), total IgE levels, atopy (defined as increased IgE levels or SPT positivity or both), bronchial hyperresponsiveness, and clinical asthma were investigated. The observed distribution of the identical by descent alleles at the LTαNcoI locus was different from expected for SPT and atopy (p=0.015). The LTαNcoI genotype distribution for increased IgE levels was different between males and females (p=0.0011), and an association of the 2.2 genotype with increased IgE levels was observed in females (p=0.0032). The results indicate that the LTα gene, or a closely linked locus, is associated with atopy, and suggest a sex difference in the effect of the gene.


Keywords: atopy; asthma; TNF; LTα

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Selected References

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