Serotonin transporter and BDNF polymorphisms interact to predict trait worry.

Serotonin transporter and BDNF polymorphisms interact to predict trait worry.
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DOI:
10.1080/10615806.2014.909928
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发表时间:
2014
期刊:
Anxiety, stress, and coping
影响因子:
--
通讯作者:
McGeary JE
McGeary JE
中科院分区:
其他
文献类型:
--
作者:
Bredemeier K;Beevers CG;McGeary JE

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过度担忧与一系列心理障碍有关。虽然之前的研究已经检测了与一系列不同焦虑表型相关的基因,但没有一项研究专门探索与总体焦虑倾向相关的基因。本研究检测了SLC6A4基因的5-HTTLPR、脑源性神经营养因子(BDNF)基因的Val66Met和儿茶酚-O-甲基转移酶(COMT)基因的Val158Met三个候选基因的功能多态与特质焦虑之间的关系。一个不同的成年参与者样本(n=173)完成了宾夕法尼亚州立大学的担忧问卷(PSWQ),并提供了DNA样本用于基因分型。结果显示,5-HTTLPR和BDNF型之间存在显著的交互作用,可预测焦虑水平。5-HTTLPR短等位基因与PSWQ评分呈显著正相关,但仅在BDNF MET等位基因携带者中存在。COMT基因与焦虑水平没有显著关联,COMT与5-HTTLPR或BDNF基因之间也没有相互作用来预测PSWQ得分。这些发现为担忧的可能遗传病因提供了初步证据。最后,本文讨论了本研究的主要局限和未来研究的方向。
Excessive worry is associated with a range of psychological disorders. While previous studies have examined genes associated with a range of different anxiety phenotypes, none have explored genes specifically associated with the general tendency to worry. The present study tested associations between trait worry and functional polymorphisms of three candidate genes: the serotonin transporter-linked polymorphic region (5-HTTLPR) of the SLC6A4 gene, the Val66Met region of the brain-derived neurotrophic factor (BDNF) gene, and the Val158Met region of the catechol-O-methyltransferase (COMT) gene. A heterogeneous sample of adult participants (n = 173) completed the Penn State Worry Questionnaire (PSWQ) and provided DNA samples for genotyping. Results revealed a significant interaction between 5-HTTLPR and BDNF genotypes predicting levels of worry. Specifically, there was a significant positive association between 5-HTTLPR short alleles and PSWQ scores, but only in BDNF met allele carriers. COMT genotype was not significantly associated levels of worry, nor did COMT interact with 5-HTTLPR or BDNF genotypes to predict PSWQ scores. These findings provide preliminary evidence about the putative genetic etiology of worrying. Key limitations of the present study and corresponding directions for future research on this topic are discussed.
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