Peroxisome proliferator-activated receptor gamma/Pro12Ala polymorphism and peroxisome proliferator-activated receptor gamma coactivator-1 alpha/Gly482Ser polymorphism in patients with sarcoidosis.
OBJECTIVE
Reduced expression and activity of the peroxisome proliferator-activated receptor gamma (PPARG) have been measured in cells of bronchoalveolar lavage fluid in sarcoidosis patients. PPARG, together with its transcriptional coactivator peroxisome proliferator-activated receptor gamma coactivator-1 alpha (PPARGC1A), has important modulating effects on immune response and apoptosis. In the present study, we investigated whether the polymorphisms Pro12Ala (rs1805192) in the PPARG gene and Gly482Ser (rs8192678) in the PPARGC1A gene, which affect transcriptional activities, are associated with sarcoidosis.


METHODS
We performed an integrative "omic" approach and identified the PPARG gene as a suitable candidate. Polymerase chain reaction was performed followed by restriction fragment length polymorphism to determine PPARG/Pro12Ala and PPARGC1A/Gly482Ser genotypes of 104 sarcoidosis patients and 112 healthy control subjects.


RESULTS
A higher frequency of the Ala allele (p=0.0101, OR=1.84, CI 1.18-2.88), as well as a significantly higher frequency of Pro/Ala heterozygotes and Ala/Ala homozygotes at the Pro12Ala/PPARG polymorphism (p=0.0020, OR=2.45, CI 1.42-4.25) were found in patients with sarcoidosis. In addition, a higher frequency of the Ser allele (p=0.013, OR=1.69, CI 1.13-2.53) and Gly/Ser heterozygotes and Ser/Ser homozygotes (p=0.0470, OR=1.80, CI 1.04-3.10) at the Gly482Ser/PPARGC1A polymorphism were found in patients with sarcoidosis as compared to healthy control subjects.


CONCLUSIONS
Our results indicate that the presence of the Ala allele at the PPARG/Pro12Ala polymorphism and the Ser allele at the PPARGC1A/Gly482Ser polymorphism may be a predisposing factor for sarcoidosis.
Maver
A
A
Division of Medical Genetics, Department of Gynecology and Obstetrics, University Clinical Centre, Slovenia.
Medica
I
I
Salobir
B
B
Tercelj-Zorman
M
M
Sabovic
M
M
Petrovic
D
D
Peterlin
B
B
D000328:Adult; D000368:Aged; D001706:Biopsy; D018893:Bronchoalveolar Lavage; D004247:DNA / Q000235:genetics*; D005260:Female; D020022:Genetic Predisposition to Disease; D006360:Heat-Shock Proteins / Q000235:genetics* / Q000378:metabolism; D006801:Humans; D008297:Male; D008875:Middle Aged; D047495:PPAR gamma / Q000235:genetics* / Q000378:metabolism; D000071248:Peroxisome Proliferator-Activated Receptor Gamma Coactivator 1-alpha; D016133:Polymerase Chain Reaction; D011110:Polymorphism, Genetic; D012189:Retrospective Studies; D012507:Sarcoidosis / Q000175:diagnosis / Q000235:genetics / Q000378:metabolism*; D014157:Transcription Factors / Q000235:genetics* / Q000378:metabolism; D055815:Young Adult
D006360:Heat-Shock Proteins; D047495:PPAR gamma; C486497:PPARGC1A protein, human; D000071248:Peroxisome Proliferator-Activated Receptor Gamma Coactivator 1-alpha; D014157:Transcription Factors; D004247:DNA