Abstract:
:Whether smoking-associated DNA methylation has a causal effect on lung function has not been thoroughly evaluated. We first investigated the causal effects of 474 smoking-associated CpGs on forced expiratory volume in 1 s (FEV1) in UK Biobank (n = 321,047) by using two-sample Mendelian randomization (MR) and then replicated this investigation in the SpiroMeta Consortium (n = 79,055). Second, we used two-step MR to investigate whether DNA methylation mediates the effect of smoking on FEV1. Lastly, we evaluated the presence of horizontal pleiotropy and assessed whether there is any evidence for shared causal genetic variants between lung function, DNA methylation, and gene expression by using a multiple-trait colocalization ("moloc") framework. We found evidence of a possible causal effect for DNA methylation on FEV1 at 18 CpGs (p < 1.2 × 10-4). Replication analysis supported a causal effect at three CpGs (cg21201401 [LIME1 and ZGPAT], cg19758448 [PGAP3], and cg12616487 [EML3 and AHNAK] [p < 0.0028]). DNA methylation did not clearly mediate the effect of smoking on FEV1, although DNA methylation at some sites might influence lung function via effects on smoking. By using "moloc", we found evidence of shared causal variants between lung function, gene expression, and DNA methylation. These findings highlight potential therapeutic targets for improving lung function and possibly smoking cessation, although larger, tissue-specific datasets are required to confirm these results.
journal_name
Am J Hum Genetjournal_title
American journal of human geneticsauthors
Jamieson E,Korologou-Linden R,Wootton RE,Guyatt AL,Battram T,Burrows K,Gaunt TR,Tobin MD,Munafò M,Davey Smith G,Tilling K,Relton C,Richardson TG,Richmond RCdoi
10.1016/j.ajhg.2020.01.015subject
Has Abstractpub_date
2020-03-05 00:00:00pages
315-326issue
3eissn
0002-9297issn
1537-6605pii
S0002-9297(20)30015-Xjournal_volume
106pub_type
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