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- Title
Single nucleotide polymorphism screening and association analysis– exclusion of integrinβ7 and vitamin D receptor (chromosome 12q) as candidate genes for asthma.
- Authors
Vollmert, C.; Illig, T.; Altmüller, J.; Klugbauer, S.; Loesgen, S.; Dumitrescu, L.; Wjst, M.
- Abstract
The human genes coding for integrinβ7 (ITGB7) and vitamin D receptor (VDR) are two of the several candidate genes for asthma and related phenotypes found in a promising candidate region on chromosome 12q that has been identified in multiple genomewide screens and candidate gene approaches.All exons, including parts of the neighbouring introns, and the predicted promoter region of theITGB7gene were screened for common polymorphisms in 32 independent asthmatic and healthy probands, resulting in the detection of two single nucleotide polymorphisms (SNPs) unknown so far. In addition to these SNPs, five already described SNPs of theITGB7and one in the humanVDRgene were analysed in a Caucasian sib pair study of 176 families with at least two affected children, using matrix assisted laser desorption/ionization time of flight mass spectrometry. All confirmed SNPs were tested for linkage/association with asthma and related traits (total serum IgE level, eosinophil cell count and slope of the dose–response curve after bronchial challenge).Two new variations in theITGB7gene were identified. The coding SNP in exon 4 causes a substitution of the amino acid GLU by VAL, whereas the other variation is non-coding (intron 3). None of the eight analysed SNPs, of either theITGB7or theVDRgenes, showed significant linkage/association with asthma or related phenotypes in the family study.These findings indicate that neither the humanITGB7nor theVDRgene seem to be associated with the pathogenesis of asthma or the expression of related allergic phenotypes such as eosinophilia and changes in total IgE level.
- Subjects
ASTHMA; GENETIC polymorphisms; INTEGRINS; VITAMIN D; CELL receptors; HUMAN chromosomes
- Publication
Clinical & Experimental Allergy, 2004, Vol 34, Issue 12, p1841
- ISSN
0954-7894
- Publication type
Article
- DOI
10.1111/j.1365-2222.2004.02047.x