Radder Josiah E, Gregory Alyssa D, Leme Adriana S, Cho Michael H, Chu Yanxia, Kelly Neil J, Bakke Per, Gulsvik Amund, Litonjua Augusto A, Sparrow David, Beaty Terri H, Crapo James D, Silverman Edwin K, Zhang Yingze, Berndt Annerose, Shapiro Steven D
1 Division of Pulmonary, Allergy and Critical Care Medicine, Department of Medicine, University of Pittsburgh, Pittsburgh, Pennsylvania.
2 Channing Division of Network Medicine, and.
Am J Respir Cell Mol Biol. 2017 Sep;57(3):367-375. doi: 10.1165/rcmb.2016-0220OC.
Chronic obstructive pulmonary disease (COPD) is caused by a complex interaction of environmental exposures, most commonly cigarette smoke, and genetic factors. Chronic cigarette smoke exposure in the mouse is a commonly used animal model of COPD. We aimed to expand our knowledge about the variable susceptibility of inbred strains to this model and test for genetic variants associated with this trait. To that end, we sought to measure differential susceptibility to cigarette smoke-induced emphysema in the mouse, identify genetic loci associated with this quantitative trait, and find homologous human genes associated with COPD. Alveolar chord length (CL) in 34 inbred strains of mice was measured after 6 months of exposure to cigarette smoke. After testing for association, we connected a murine candidate locus to a published meta-analysis of moderate-to-severe COPD. We identified deleterious mutations in a candidate gene in silico and measured gene expression in extreme strains. A/J was the most susceptible strain in our survey (Δ CL 7.0 ± 2.2 μm) and CBA/J was the least susceptible (Δ CL -0.3 ± 1.2 μm). By integrating mouse and human genome-wide scans, we identified the candidate gene Abi3bp. CBA/J mice harbor predicted deleterious variants in Abi3bp, and expression of the gene differs significantly between CBA/J and A/J mice. This is the first report of susceptibility to cigarette smoke-induced emphysema in 34 inbred strains of mice, and Abi3bp is identified as a potential contributor to this phenotype.
慢性阻塞性肺疾病(COPD)是由环境暴露(最常见的是香烟烟雾)与遗传因素的复杂相互作用引起的。在小鼠中慢性暴露于香烟烟雾是常用的COPD动物模型。我们旨在扩展对近交系对此模型易感性差异的认识,并测试与该性状相关的基因变异。为此,我们试图测量小鼠对香烟烟雾诱导的肺气肿的易感性差异,确定与该数量性状相关的基因座,并找到与COPD相关的同源人类基因。在暴露于香烟烟雾6个月后,测量了34个近交系小鼠的肺泡弦长(CL)。在进行关联测试后,我们将一个小鼠候选基因座与已发表的中重度COPD荟萃分析联系起来。我们在计算机上鉴定了一个候选基因中的有害突变,并测量了极端品系中的基因表达。在我们的研究中,A/J是最易感品系(ΔCL 7.0±2.2μm),而CBA/J是最不易感品系(ΔCL -0.3±1.2μm)。通过整合小鼠和人类全基因组扫描,我们鉴定了候选基因Abi3bp。CBA/J小鼠在Abi3bp中携带预测的有害变异,并且该基因在CBA/J和A/J小鼠之间的表达存在显著差异。这是关于34个近交系小鼠对香烟烟雾诱导的肺气肿易感性的首次报告,并且Abi3bp被鉴定为该表型的潜在促成因素。