TY - JOUR
T1 - Rare variations in WNT3A and DKK1 may predispose carriers to primary osteoporosis
AU - Korvala, Johanna
AU - Löija, Marika
AU - Mäkitie, Outi
AU - Sochett, Etienne
AU - Jüppner, Harald
AU - Schnabel, Dirk
AU - Mora, Stefano
AU - Cole, William G.
AU - Ala-Kokko, Leena
AU - Männikkö, Minna
PY - 2012/10
Y1 - 2012/10
N2 - Childhood-onset primary osteoporosis is manifested as reduced bone mineral density, peripheral fractures and/or vertebral compression fractures. Until now, only mutations in LRP5 have been shown to cause the disorder. Candidate gene analyses were performed on 15 patients with primary osteoporosis and 80 healthy controls using CSGE and sequencing. The genes studied included DKK1, DKK2, WNT3A, WNT10B, AXIN1, SOST, TPH1 and 5- HTR1B. Two rare variants in WNT3A (c.152A > G, p.K51R) and DKK1 (c.359G > T, p.R120L) were identified in two patients and their affected family members, but not in control subjects, suggesting a significance for the skeletal phenotype. The in vitro studies of variants showed reduced signaling activity in p.K51R-Wnt3a, while no differences were observed between the WT and variant forms of DKK1. This study addresses the role of other components of the canonical Wnt signaling pathway besides LRP5 in primary osteoporosis, and putatively associates WNT3A and DKK1 variants with the disorder. Future functional studies are needed to elucidate the functional effects of the variants.
AB - Childhood-onset primary osteoporosis is manifested as reduced bone mineral density, peripheral fractures and/or vertebral compression fractures. Until now, only mutations in LRP5 have been shown to cause the disorder. Candidate gene analyses were performed on 15 patients with primary osteoporosis and 80 healthy controls using CSGE and sequencing. The genes studied included DKK1, DKK2, WNT3A, WNT10B, AXIN1, SOST, TPH1 and 5- HTR1B. Two rare variants in WNT3A (c.152A > G, p.K51R) and DKK1 (c.359G > T, p.R120L) were identified in two patients and their affected family members, but not in control subjects, suggesting a significance for the skeletal phenotype. The in vitro studies of variants showed reduced signaling activity in p.K51R-Wnt3a, while no differences were observed between the WT and variant forms of DKK1. This study addresses the role of other components of the canonical Wnt signaling pathway besides LRP5 in primary osteoporosis, and putatively associates WNT3A and DKK1 variants with the disorder. Future functional studies are needed to elucidate the functional effects of the variants.
KW - Bone
KW - DKK1
KW - Genetics
KW - Osteoporosis
KW - WNT3A
UR - http://www.scopus.com/inward/record.url?scp=84866434299&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84866434299&partnerID=8YFLogxK
U2 - 10.1016/j.ejmg.2012.06.011
DO - 10.1016/j.ejmg.2012.06.011
M3 - Article
C2 - 22789636
AN - SCOPUS:84866434299
VL - 55
SP - 515
EP - 519
JO - European Journal of Medical Genetics
JF - European Journal of Medical Genetics
SN - 1769-7212
IS - 10
ER -