因的基因型组合。在COPD患者中常出现TNFA基因的GG基因型和LTA基因AG杂合基因型组合的个体。在COPD发生风险方面,这个基因型组合的个体中出现明显增高。
意大利研究者进行了健康对照组和COPD患者组之间组合类似分析〔7,10〕。COPD患者最常出现的GGAA组合频率为45%,对照组为45.9%。来自意大利COPD患者组GGAG组合频率(29.2%)没有超过健康对照组(31.5%)。但在COPD组观察到GGGG和GAAA组合频率增高倾向(2.4%比对照的0.8%和4.8%比对照的0.8%)。
本研究描述了LTA基因的基因型,以及TNFA和LTA基因的基因型组合,它们与COPD的易感性相关。在临床上可作为遗传性标记进行检测,用于早期发现COPD的易感人群,对于预防COPD的发生发展具有一定的实际意义。但几种基因型的多态性显然不能解释COPD发病中全部的基因调控机制及其遗传易感性〔11〕。
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