Maria L Vazquez-Villegas 1 2, Norma A Rodriguez-Jimenez 3, Betsabe Contreras-Haro 4, Jose C Vasquez-Jimenez 5, Edsaul E Perez-Guerrero 6, Maria-Cristina Moran-Moguel 7, Esther N Sánchez-Rodríguez 8, Alejandra Villagómez-Vega 8, Ismael Nuño-Arana 9, Itzel N Becerra-Alvarado 8, Edy D Rubio-Arellano 3, Cesar A Nava-Valdivia 10, Juan M Ponce-Guarneros 3, Nicte S Fajardo-Robledo 11, Arnulfo H Nava-Zavala 12 13 14, Laura Gonzalez-Lopez 8 15, Ana M Saldaña-Cruz 3
Genet Test Mol Biomarkers. 2021 Mar;25(3):211-217. doi: 10.1089/gtmb.2020.0199.
Background: The Wnt/β catenin pathway promotes bone mineralization stimulating proliferation, differentiation, and survival of osteoblasts; it also inhibits osteoclast differentiation and osteocyte activity. Sclerostin (SOST) and Dickkopf 1 (DKK1) are Wnt/β catenin pathway inhibitors. Genetic variability in the expression of SOST and DKK1 might be involved in the development of postmenopausal osteoporosis (OP).
Aim: To determine whether the SOST rs851056 and DKK1 rs1569198 polymorphisms are associated with OP in Mexican-Mestizo postmenopausal women.
Materials and Methods: Two hundred and eighty Mexican-Mestizo postmenopausal women were assessed for their bone mineral density by dual-energy X-ray absorptiometry (DXA). Patients were classified as OP or non-OP. Genomic DNA was extracted from peripheral blood leukocytes. Genetic polymorphisms were analyzed by quantitative polymerase chain reaction using TaqMan probes.
Results: The frequency of OP was 40% among the study population. Osteoporotic patients were older (p < 0.001), had a higher frequency of smoking (p = 0.01), and lower body mass index (p < 0.001) compared with the non-osteoporotic patients. The genotypic frequencies of the rs851056 locus of the SOST gene were GG 19%, GC 45%, and CC 35%, whereas the genotypic frequencies of the rs1569198 locus of the DKK1 gene were GG 15%, GA 40%, and AA 44%. In relation to rs851056 locus of the SOST gene, no differences were observed between the OP and non-OP cohorts in the frequencies of the GC polymorphism (48.7% vs. 43.1%). Similarly, analyses of the DKK1 rs1569198 does not demonstrate differences in the GA genotypic frequencies between the OP and non-OP cohorts (42.5% vs. 38.9%).
Conclusion: Polymorphisms SOST rs851056 and DKK1 rs1569198 polymorphisms are not associated with OP in Mexican-Mestizo postmenopausal women.