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Study of the deletions in the GSTM1 and GSTT1 genes and of the Ile105Val polymorphism of the GSTP1 gene in patients with Paget’s disease of bone
Usategui-Martín R, Corral E, Alonso M, Calero-Paniagua I, Carranco-Medina TE, Quesada-Moreno A, Sánchez-González MD, Hidalgo-Calleja C, Pérez-Garrido L, Montilla Morales C, Mirón-Canelo J, González-Sarmiento R, del Pino-Montes J
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Background: Paget’s disease of bone (PDB) is a disorder focussed on the bone with an increase in the number, size and activity of the osteoclasts. Some epidemiological data support the theory of its relationship with toxic or infectious environmental agents, whose interaction with some predisposing genetic alterations may lead to PDB. The glutathione S-transferases (GST) are involved in the metabolism of toxins, by catalysing the nucleophilic attack of the physiological substrate, reduced glutathione or GSH (g-Glu-Cys-Gly) on the electrophilic centre of a great number of toxic structures. We studied whether the variability of the GSTM1, GSTP1 and GSTT1 genes is related to the risk of developing PDB. Patients and methods: We analysed 148 patients diagnosed with PDB, and 207 control individuals matched in sex and age with no history of bone alterations. Using genomic DNA obtained from peripheral blood the presence-absence of the GSTM1 and GSTT1 genes was studied by means of multiplex PCR. The study of the Ile105Val GSTP1 gene was carried out using PCR and subsequent digestion with the restriction enzyme BsmAI. The distribution of genotypes was analysed by means of the Pearson chi-square test. When statistically significant differences were found we carried out a multivariate logistical regression to determine the risk which the presence of a particular genotype could generate. We used the CSPSS 21.0 program. Differences were considered to be statistically significant when the value of p<0.05. Results: We found differences in the distribution of the presence-absence of the deletion in the GSTM1 gene; not being a carrier for the deletion or being a heterozygous carrier in the GSTM1 gene confers a lower risk of developing PDB (OR=0.56, 95% CI: 0.36-0.87; p=0.011). In the study of the GSTT1 and GSTP1 genes there were no significant differences. Conclusion: The detoxifying activity diminishes when two copies of the GSTM1 gene with deletions are inherited by reducing in enzyme activity, which has been associated with a greater susceptibility to some cancers, alcoholic hepatopathy and other inflammatory problems. We are not aware of any description of its association with PDB. PDB is observed more frequently in carriers of the homozygous deletion in the GSTM1 gene. This fact could explain the epidemiological findings which link PDB to exposure to certain environmental agents.
Key words: Paget’s disease of bone, glutathione S-transferase, genetics, polymorphism.
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