Genetic Study of Families Affected by Paget's Disease of Bone
试验速览
- 阶段
- 不适用
- 状态
- 已完成
- 入组人数
- 83
- 试验地点
- 1
- 主要终点
- To identify new mutations or new haplotypes of mutations already identified, and/or to identify new mutations in new genes of Paget's disease of bone.
研究概览
简要总结
Paget's disease of bone is a frequent bone disorder which usually starts after the age of 40 and which is characterized by bone pain and deformities. Although often without any symptoms, this disease may have severe complications such as fissures, fractures, neurological compression, or deafness. In some cases, it is a genetic disorder transmitted with a dominant autosomal pattern of inheritance: one of the two parents carrying the disease transmits it to his offspring with a risk of 50% for each child. Since 2002, the first gene involved in Paget's disease of bone is known and 14 mutations of this gene have been published. A study confirmed that the presence of those mutations was associated with younger age of onset and more extensive disease. Thus, the knowledge of those genetic factors in the relatives of an affected individual allows the screening of the patients with a higher risk for complications, who may benefit from a medical follow up and earlier treatment, in order to avoid complications. Indeed, Paget's disease of bone may be treated efficiently by bisphosphonates.
This project aims at identifying and collecting over one year, 15 affected individuals affected by Paget's disease of bone and the relatives up to the second degree of relativeness (a total of 100 individuals is expected). The blood samples may be analysed in order to search for mutations of the previously known gene and/or to search for new mutations on new genes.
详细描述
Background : Paget's disease of bone is a chronic bone disorder with a late onset, usually after the age of 40. This disease is transmitted on a dominant autosomal pattern of inheritance with incomplete penetrance. Since 2002, the first gene (SEQUESTOSOME 1 or SQSTM1) involved in Paget's disease of bone is known. Actually, 14 mutations of this gene located in exons 7 and 8 have been reported in familial forms of the disease as well as in sporadic forms. Although the size of the samples studied in the literature are rather small to establish phenotype genotype correlations, it seems that the presence of those mutations are associated with an earlier onset of the disease and a more extensive disease. However, the presence of those mutations seems not sufficient to explain the whole development of the disease, but functional analyses may help to understand the real effect of those mutations. The link between the genetics and the observation of PARANYXOVIRAL inclusions in the nucleus of osteoclasts is not actually established. The hypothesis of an interaction between gene and environment may be plausible for several authors.
The results of a study on 94 sporadic French patients with Paget's disease of bone lead to the identification of two new mutations of SQSTM1 gene and showed the presence of double SQSTM1 mutations. This study established phenotype genotype correlations, affected individuals who carry a mutation have a younger age at diagnosis and a polyostotic involvement. This phenotype genotype correlation is a major element that may help to target the relatives at risk for complications, who may benefit from an earlier treatment to prevent complications occurrence.
Primary objective : to recruit 15 patients affected by Paget's disease of bone, with a familial form, and their relatives healthy or affected, up to the second degree of relativeness (total of about 100 individuals) for a genetic study on Paget's disease of bone with : DNA collection, blood puncture for RNA collection, serum collection and urinary collection to study the bone remodelling parameters. DNA samples will be used to search for mutations involved in Paget's disease of bone in collaboration with the research center of the University hospital center of LAVAL, Quebec, Canada.
Inclusion and exclusion criteria are described elsewhere.
Description of the protocol:
研究设计
- 研究类型
- Observational
- 观察模型
- Family Based
- 时间视角
- Retrospective
入排标准
- 年龄范围
- 18 Years 至 —（Adult, Older Adult）
- 性别
- All
- 接受健康志愿者
- 否
入选标准
- •Patient aged over 18 years,
- •patient who underwent a clinical examination,
- •patient who gave its written consent,
- •Each individual (index case) affected by Paget's disease of bone (with diagnosis confirmed by alkalies phosphatases analysis and/or imaging with bone scintigraphy and radiographies on the affected sites with a typical aspect of the disease), and :
- •At least one relative affected by Paget's disease of bone with confirmed diagnosis (see above),
- •Or an age at diagnosis < 55 years,
- •Or a polyostotic involvement with at least 4 affected bones,
- •Or the presence of a bone deformity at the time of the diagnosis.
- •Each relative with established phenotype by imaging (bone scintigraphy and/or radiographies), at first or second degree of relativeness of an index case defined in (a).
排除标准
- •Index case with not confirmed Paget's disease of bone by biological and/or radiological examinations,
- •Index with confirmed Paget's disease but without relative with the same disease, with an age at diagnosis >55 years, with a number of affected bones <4, without any bone deformity at the time of the diagnosis
- •Healthy relatives of a Paget patient who refuse to undergo bone scintigraphy and bone radiographies.
- •Individuals < 18 years
- •Pregnant or breast
- •feeding woman-individual living ina sanitary or social establishment
- •individual under guardianship
- •individual in an emergency situation
- •individual unable to give his consent
- •incarcerated individual
- •patient not covered by healthcare institutions
结局指标
主要结局
To identify new mutations or new haplotypes of mutations already identified, and/or to identify new mutations in new genes of Paget's disease of bone.
时间窗: 2007-2008
次要结局
未报告次要终点