期刊
JOURNAL OF BONE AND MINERAL RESEARCH
卷 31, 期 9, 页码 1734-1742出版社
WILEY
DOI: 10.1002/jbmr.2841
关键词
WNT SIGNALING; PEDIATRIC OSTEOPOROSIS; COMPRESSION FRACTURE; BONE; TURNOVER; AUTOSOMAL DOMINANT OSTEOPOROSIS
资金
- Sigrid Juselius Foundation
- Folkhalsan Research Foundation
- Academy of Finland
- Foundation for Pediatric Research
- Helsinki University Research Funds
- Swedish Research Council
- Novo Nordisk Foundation
- European Society for Paediatric Endocrinology Research Unit
- Swedish Childhood Cancer Foundation
- Stockholm County Council
- Karolinska Institute
- Novo Nordisk Fonden [NNF15OC0016398] Funding Source: researchfish
WNT proteins comprise a 19-member glycoprotein family that act in several developmental and regenerative processes. In bone, WNT proteins regulate osteoblast differentiation and maintain bone health by activating the canonical WNT/-catenin pathway. We reported a heterozygous missense mutation c.652T>G (p.C218G) in WNT1 exon 4 as the cause for severe early-onset, autosomal dominant osteoporosis. The initial study concerned a large Finnish family with 10 affected adults. Here we report clinical findings of the WNT1 osteoporosis in 8 children and young adults (median age 14 years; range 10 to 30 years) in two families, all with the p.C218G mutation in WNT1. Clinical assessments showed no apparent dysmorphia or features similar to typical osteogenesis imperfecta (OI). Biochemistry revealed no changes in parameters of calcium metabolism and bone turnover markers. Fracture frequencies varied, but all subjects had sustained at least one fracture and 4 had a pathological fracture history. Plain radiographs showed osteopenic appearance, loss in vertebral height, and thin diaphyses of the long bones. Bone densitometry showed the BMD to be below normal median in all subjects and the bone mass deficit seemed to be more severe in older participants. Bone histomorphometry revealed a low turnover osteoporosis in 2 subjects at ages 14 and 16 years. These findings are congruent with earlier findings in adult patients and indicate that WNT1 osteoporosis causes significant skeletal changes already in early childhood and impairs bone mass gain during pubertal years. Genetic testing of children or close relatives of affected individuals is recommended for appropriate preventive measures. (c) 2016 American Society for Bone and Mineral Research.
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