SRI International, Menlo Park, CA 94025, USA.
Cancer Epidemiol Biomarkers Prev. 2009 Dec;18(12):3399-406. doi: 10.1158/1055-9965.EPI-09-0960.
Nicotine withdrawal symptoms are related to smoking cessation. A Rasch model has been used to develop a unidimensional sensitivity score representing multiple correlated measures of nicotine withdrawal. A previous autosome-wide screen identified a nonparametric linkage (NPL) log-likelihood ratio (LOD) score of 2.7 on chromosome 6q26 for the sum of nine withdrawal symptoms.
The objectives of these analyses were to (a) assess the influence of nicotine withdrawal sensitivity on relapse, (b) conduct autosome-wide NPL analysis of nicotine withdrawal sensitivity among 158 pedigrees with 432 individuals with microsatellite genotypes and nicotine withdrawal scores, and (c) explore family-based association of single nucleotide polymorphism (SNP) at the mu opioid receptor candidate gene (OPRM1) with nicotine withdrawal sensitivity in 172 nuclear pedigrees with 419 individuals with both SNP genotypes and nicotine withdrawal scores.
An increased risk for relapse was associated with nicotine withdrawal sensitivity score (odds ratio, 1.25; 95% confidence interval, 1.10-1.42). A maximal NPL LOD score of 3.15, suggestive of significant linkage, was identified at chr6q26 for nicotine withdrawal sensitivity. Evaluation of 18 OPRM1 SNPs via the family-based association test with the nicotine withdrawal sensitivity score identified eight tagging SNPs with global P values <0.05 and false discovery rate Q values <0.06.
An increased risk of relapse, suggestive linkage at chr6q26, and nominally significant association with multiple OPRM1 SNPs were found with Rasch-modeled nicotine withdrawal sensitivity scores in a multiplex smoking pedigree sample. Future studies should attempt to replicate these findings and investigate the relationship between nicotine withdrawal symptoms and variation at OPRM1.
尼古丁戒断症状与戒烟有关。拉什模型已被用于开发代表尼古丁戒断的多个相关测量的一维敏感性评分。先前的常染色体全基因组筛查发现,9 种戒断症状总和的非参数连锁(NPL)对数似然比(LOD)评分在 6q26 染色体上为 2.7。
这些分析的目的是(a)评估尼古丁戒断敏感性对复发的影响,(b)对 158 个家系中的 432 个人进行常染色体全基因组 NPL 分析,这些家系具有微卫星基因型和尼古丁戒断评分,以及(c)在 172 个核家系中探索候选基因(OPRM1)中的单核苷酸多态性(SNP)与尼古丁戒断敏感性的基于家族的关联,这些家系有 419 个人具有 SNP 基因型和尼古丁戒断评分。
与尼古丁戒断敏感性评分相关的复发风险增加(优势比,1.25;95%置信区间,1.10-1.42)。在 chr6q26 上鉴定出尼古丁戒断敏感性的最大 NPL LOD 评分 3.15,提示存在显著连锁。通过基于家族的关联检验,使用尼古丁戒断敏感性评分对 18 个 OPRM1 SNPs 进行评估,确定了 8 个具有全局 P 值 <0.05 和错误发现率 Q 值 <0.06 的标记 SNP。
在一个多态吸烟家系样本中,使用拉什模型的尼古丁戒断敏感性评分发现,复发风险增加、chr6q26 处的提示性连锁以及与多个 OPRM1 SNPs 的名义显著关联。未来的研究应尝试复制这些发现,并研究尼古丁戒断症状与 OPRM1 变异之间的关系。