Genetic Analysis of Bone Structure and Strength

骨骼结构和强度的遗传分析

• 批准号: 7097425
• 负责人: CHARLES H TURNER
• 金额: $ 40.46万
• 依托单位: INDIANA UNIV-PURDUE UNIV AT INDIANAPOLIS
• 依托单位国家: 美国
• 财政年份: 2000
• 资助国家: 美国
• 起止时间: 2000-02-08 至 2009-05-31
• 项目状态: 已结题
• 来源: https://reporter.nih.gov/project-details/7097425
• 关键词: biomechanics; bone density; bone development; bone fracture; calcium flux; developmental genetics; laboratory mouse; mechanical stress; microarray technology; morphology; osteoblasts; quantitative trait loci; shear stress; tissue /cell culture; biomechanics; bone density; bone development; bone fracture; calcium flux; developmental genetics; laboratory mouse; mechanical stress; microarray technology; morphology; osteoblasts; quantitative trait loci; shear stress; tissue /cell culture

DESCRIPTION (provided by applicant): Osteoporosis is a complex disease, from a genetics standpoint. Bone mass and structure are highly heritable traits, but there are probably many genes that contribute to these traits. We have identified quantitative trait loci (QTL) in B6C3F2 mice that are linked to bone structure and strength. In addition, we have developed 11 congenic mouse lines, each of which contains a bone structure/strength QTL. Our preliminary studies demonstrate that the progenitor mouse strains (C57BL/6 and C3H/He) differ considerably in their skeletal response to mechanical loading. Furthermore, we demonstrated in a congenic mouse line, B6.C3H-4T, a significantly enhanced skeletal responsiveness to mechanical loading. Not surprisingly, B6.C3H-4T femurs have significantly larger cross-sectional size compared to B6 control femurs. This finding suggests that congenic mice can be used to identify genes that affect cellular mechanotransduction in bone. We have identified four congenic mouse lines (in addition to B6.C3H-4T) that have altered femoral crosssectional size. We propose to determine which of these congenic lines differ in skeletal mechanical loading response. We will then develop congenic sublines and complete fine mapping of the QTLs to isolate genes contributing to altered mechanotransduction. We will develop multiple sublines of congenic mice to genetically dissect each QTL region to better pinpoint the location on the chromosome contributing to femoral BMD and/or structure/strength phenotypes. In addition we will study osteoblasts isolated from congenic mouse lines to determine their responsiveness to mechanical stimuli and we will examine gene expression profiles in bones from congenic mice and in isolated osteoblasts in order to determine the genetic pathways that differ among the congenic lines.

描述（由申请人提供）：从遗传学的角度来看，骨质疏松症是一种复杂的疾病。骨骼质量和结构是高度可遗传的特征，但是可能有许多基因导致这些特征。我们已经确定了与骨骼结构和强度有关的B6C3F2小鼠中的定量性状基因座（QTL）。此外，我们已经开发了11种先天小鼠系，每条小鼠系列都包含骨结构/强度QTL。我们的初步研究表明，祖细胞菌株（C57BL/6和C3H/HE）在其对机械负荷的骨骼反应中有很大差异。此外，我们在b6.c3h-4t的先天小鼠系中证明了这一点，这是对机械载荷的骨骼响应的显着增强。毫不奇怪，与B6对照股相比，B6.C3H-4T股骨具有明显更大的横截面大小。这一发现表明，先天小鼠可用于鉴定影响骨骼中细胞机械转导的基因。我们已经确定了改变股骨横截面大小的四种先天小鼠系（除了B6.C3H-4T之外）。我们建议确定骨骼机械载荷响应中哪些先天线不同。然后，我们将开发QTLS的固有subline和完整的QTL映射，以分离有助于改变机械转导的基因。我们将开发多个先天小鼠的多种额叶，以遗传剖析每个QTL区域，以更好地确定染色体上有助于股骨BMD和/或结构/强度表型的位置。此外，我们还将研究从异基因小鼠系中分离出的成骨细胞，以确定它们对机械刺激的反应，我们将检查来自先天小鼠和分离的成骨细胞的骨骼中的基因表达谱，以确定与先天性线不同的遗传途径。