Possible gene dosage effect of glutathione-S-transferases on atopic asthma: Using real-time PCR for quantification of GSTM1 and GSTT1 gene copy numbers

Asthma is a complex genetic disorder characterized by chronic inflammation in the airways. As oxidative stress is a key component of inflammation, variations in genes involved in antioxidant defense could therefore be likely candidates for asthma. Three enzymes from the superfamily glutathione‐S‐tra...

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Veröffentlicht in:Human mutation 2004-09, Vol.24 (3), p.208-214
Hauptverfasser: Brasch-Andersen, Charlotte, Christiansen, Lene, Tan, Qihua, Haagerup, Annette, Vestbo, Jørgen, Kruse, Torben A.
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container_title Human mutation
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creator Brasch-Andersen, Charlotte
Christiansen, Lene
Tan, Qihua
Haagerup, Annette
Vestbo, Jørgen
Kruse, Torben A.
description Asthma is a complex genetic disorder characterized by chronic inflammation in the airways. As oxidative stress is a key component of inflammation, variations in genes involved in antioxidant defense could therefore be likely candidates for asthma. Three enzymes from the superfamily glutathione‐S‐transferase (GST) involved in the antioxidant defense were tested for association to asthma using 246 Danish atopic families in a family‐based transmission disequilibrium test (TDT) design. A real‐time PCR assay for relative quantification of gene copy number of GSTM1 and GSTT1 was developed. The assay made it possible to distinguish individuals with zero, one, and two copies and thereby to investigate whether the GST genes influenced susceptibility to asthma in a dose‐dependent manner. We found that asthmatic patients with two copies of GSTM1 were significantly underrepresented (p
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As oxidative stress is a key component of inflammation, variations in genes involved in antioxidant defense could therefore be likely candidates for asthma. Three enzymes from the superfamily glutathione‐S‐transferase (GST) involved in the antioxidant defense were tested for association to asthma using 246 Danish atopic families in a family‐based transmission disequilibrium test (TDT) design. A real‐time PCR assay for relative quantification of gene copy number of GSTM1 and GSTT1 was developed. The assay made it possible to distinguish individuals with zero, one, and two copies and thereby to investigate whether the GST genes influenced susceptibility to asthma in a dose‐dependent manner. We found that asthmatic patients with two copies of GSTM1 were significantly underrepresented (p&lt;0.0005) and the significance increased by 10‐fold when only atopic asthmatics were analyzed (p&lt;0.00005). GSTT1 was significantly associated in an additive model to asthma, in which the alleles carrying the deletion of the gene were transmitted to affected offspring more often than expected by chance (p=0.019). The same transmission disequilibrium of the null GSTT1 allele was seen in patients with atopic asthma (p=0.021). The polymorphism c.342A&gt;G (p.I105V) in GSTP1 has previously been suggested as a risk factor for asthma. However, significant association with asthma or related atopic phenotypes could not be established in our study. We conclude that deletions of GSTM1 and GSTT1 could be risk factors for asthma and that the genes might have a protective role in the development of atopic asthma. 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Mutat</addtitle><description>Asthma is a complex genetic disorder characterized by chronic inflammation in the airways. As oxidative stress is a key component of inflammation, variations in genes involved in antioxidant defense could therefore be likely candidates for asthma. Three enzymes from the superfamily glutathione‐S‐transferase (GST) involved in the antioxidant defense were tested for association to asthma using 246 Danish atopic families in a family‐based transmission disequilibrium test (TDT) design. A real‐time PCR assay for relative quantification of gene copy number of GSTM1 and GSTT1 was developed. The assay made it possible to distinguish individuals with zero, one, and two copies and thereby to investigate whether the GST genes influenced susceptibility to asthma in a dose‐dependent manner. We found that asthmatic patients with two copies of GSTM1 were significantly underrepresented (p&lt;0.0005) and the significance increased by 10‐fold when only atopic asthmatics were analyzed (p&lt;0.00005). GSTT1 was significantly associated in an additive model to asthma, in which the alleles carrying the deletion of the gene were transmitted to affected offspring more often than expected by chance (p=0.019). The same transmission disequilibrium of the null GSTT1 allele was seen in patients with atopic asthma (p=0.021). The polymorphism c.342A&gt;G (p.I105V) in GSTP1 has previously been suggested as a risk factor for asthma. However, significant association with asthma or related atopic phenotypes could not be established in our study. We conclude that deletions of GSTM1 and GSTT1 could be risk factors for asthma and that the genes might have a protective role in the development of atopic asthma. 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Mutat</addtitle><date>2004-09</date><risdate>2004</risdate><volume>24</volume><issue>3</issue><spage>208</spage><epage>214</epage><pages>208-214</pages><issn>1059-7794</issn><eissn>1098-1004</eissn><abstract>Asthma is a complex genetic disorder characterized by chronic inflammation in the airways. As oxidative stress is a key component of inflammation, variations in genes involved in antioxidant defense could therefore be likely candidates for asthma. Three enzymes from the superfamily glutathione‐S‐transferase (GST) involved in the antioxidant defense were tested for association to asthma using 246 Danish atopic families in a family‐based transmission disequilibrium test (TDT) design. A real‐time PCR assay for relative quantification of gene copy number of GSTM1 and GSTT1 was developed. The assay made it possible to distinguish individuals with zero, one, and two copies and thereby to investigate whether the GST genes influenced susceptibility to asthma in a dose‐dependent manner. We found that asthmatic patients with two copies of GSTM1 were significantly underrepresented (p&lt;0.0005) and the significance increased by 10‐fold when only atopic asthmatics were analyzed (p&lt;0.00005). GSTT1 was significantly associated in an additive model to asthma, in which the alleles carrying the deletion of the gene were transmitted to affected offspring more often than expected by chance (p=0.019). The same transmission disequilibrium of the null GSTT1 allele was seen in patients with atopic asthma (p=0.021). The polymorphism c.342A&gt;G (p.I105V) in GSTP1 has previously been suggested as a risk factor for asthma. However, significant association with asthma or related atopic phenotypes could not be established in our study. We conclude that deletions of GSTM1 and GSTT1 could be risk factors for asthma and that the genes might have a protective role in the development of atopic asthma. Hum Mutat 24:208–214, 2004. © 2004 Wiley‐Liss, Inc.</abstract><cop>Hoboken</cop><pub>Wiley Subscription Services, Inc., A Wiley Company</pub><pmid>15300848</pmid><doi>10.1002/humu.20074</doi><tpages>7</tpages><oa>free_for_read</oa></addata></record>
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subjects Alleles
Asthma
Asthma - epidemiology
Asthma - genetics
Asthma - immunology
atopy
Biochemistry
Child
Computer Systems
Denmark - epidemiology
Enzymes
Gene Dosage
Genes
Genes, Recessive
Genetic Heterogeneity
Genetic Predisposition to Disease
Genetics
Genotype
Glutathione Transferase - genetics
Glutathione Transferase - physiology
glutathione-S-transferase M1
glutathione-S-transferase P1
glutathione-S-transferase T1
Health care
Hospitals
Humans
Hypersensitivity, Immediate - epidemiology
Hypersensitivity, Immediate - genetics
Hypersensitivity, Immediate - immunology
Inflammation
Oxidative stress
Phenotype
Polymerase Chain Reaction - methods
Polymorphism
Polymorphism, Single Nucleotide
real-time PCR quantification
Risk factors
Sequence Deletion
transmission disequilibrium test
title Possible gene dosage effect of glutathione-S-transferases on atopic asthma: Using real-time PCR for quantification of GSTM1 and GSTT1 gene copy numbers
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