
JAMA:某种基因变异会增加骨折风险
据3月19日《美国医学协会期刊》(JAMA)上的一则研究显示,一项大型研究的结果表明LRP5基因的变异与骨折风险(其风险的增加可以高达20个百分点)的显著增加及椎骨和髋骨骨密度的降低有明显的关系。
Joyce B. J. van Meurs博士及其同僚对基因LRP5 及 LRP6的各种变异与骨密度(BMD)及骨折风险之间的相关性进行了检验。他们使用的是大范围内采集的证据,即对骨质疏松遗传标记(GENOMOS)协会中全部个体层级数据的汇总分析,其中包括来自欧洲及北美18个参与团队中的3万7534位个人的数据。对骨密度的评估方法采用的是双能量X光吸光测定法(一种成像技术)。对骨折的调查是通过问卷表、病史或放射学的文献材料获得的,某些病人小组的新发骨折数据可以通过常规监控方法获得,其中包括对脊椎骨折的放射线照相检查。
文章的作者写道:“在这一大范围多中心的合作研究中,我们获得了LRP5基因的遗传变异与BMD及骨折风险都有关联的证据。其作用虽然是轻度的,但这一作用却在所有研究中都非常一致地出现。根据人们一般所接受的骨密度下降一个标准差会使骨折发生率增加一倍的估计,预计该基因变异会使骨折风险增加15到20个百分点左右。尽管对BMD进行调整仅部分降低骨折的增高的风险,但这与我们所观察到的基因变异对骨折的影响类似。这一差异可能是由基因变异造成骨折的骨质、骨格尺寸或其他非骨骼决定因素引起的,但也有可能是因为对BMD的测量误差所致。我们需要作进一步的研究来弄清这一点。”(来源:EurekAlert!中文版)
生物谷推荐原始出处:
(JAMA),2008;299(11):1277-1290,Joyce B. J. van Meurs,André G. Uitterlinden
Large-Scale Analysis of Association Between LRP5 and LRP6 Variants and Osteoporosis
JAMA. 2008;299(11):1277-1290.
Context Mutations in the low-density lipoprotein receptor–related protein 5 (LRP5) gene cause rare syndromes characterized by altered bone mineral density (BMD). More common LRP5 variants may affect osteoporosis risk in the general population.
Objective To generate large-scale evidence on whether 2 common variants of LRP5 (Val667Met, Ala1330Val) and 1 variant of LRP6 (Ile1062Val) are associated with BMD and fracture risk.
Design and Setting Prospective, multicenter, collaborative study of individual-level data on 37 534 individuals from 18 participating teams in Europe and North America. Data were collected between September 2004 and January 2007; analysis of the collected data was performed between February and May 2007. Bone mineral density was assessed by dual-energy x-ray absorptiometry. Fractures were identified via questionnaire, medical records, or radiographic documentation; incident fracture data were available for some cohorts, ascertained via routine surveillance methods, including radiographic examination for vertebral fractures.
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