Erschienen in:
01.04.2014 | Original Article
The exon 3 polymorphism of the growth hormone receptor is a severity-related factor for osteoporosis
verfasst von:
Felipe Albuquerque Marques, Túlio Cesar Lins, Ricardo Moreno Lima, Rômulo Maia Carlos Fonseca, Nanci Maria de França, Ricardo Jacó de Oliveira, Maria Teresinha de Oliveira Cardoso, Rinaldo Wellerson Pereira, Robert Pogue
Erschienen in:
Endocrine
|
Ausgabe 3/2014
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Abstract
The purpose of this study was to investigate the association between the GHR exon 3 fl/d3 polymorphism and body composition traits in Brazilian cohorts of normal post-menarche adolescent girls and in post-menopausal women with and without osteoporosis. First, multiplex PCR and quantitative PCR (TaqMan) were used with 105 DNA samples from the general Brazilian population to validate the SNP rs6873545 as a surrogate marker for the GHR polymorphism. Subsequently, genotyping was carried out to evaluate associations for this polymorphism in 136 post-menarche adolescents and 175 post-menopausal women, who were evaluated for body composition traits such as bone mineral density and fat-free mass. Statistical analysis used an independent sample t test, one-way ANOVA test and post hoc Tukey HSD test. Significant values were assumed by p < 0.05. Genotyping indicated complete linkage disequilibrium between the GHR polymorphism and the SNP alleles (r
2 = 1.0). Adolescents and healthy post-menopausal women showed no genotype associations for body composition traits or osteoporosis. However, a lower total body bone mineral density was observed in fl/fl post-menopausal women with osteoporosis (p = 0.0004). These results suggest that the SNP rs6873545 can be used as a surrogate for the GHR
fl/d3 polymorphism due to linkage disequilibrium in the Brazilian population and that the fl/fl genotype is a severity–related risk factor for osteoporosis, but did not appear to be associated with disease status.