Deep Sequencing of Three Loci Implicated in Large-Scale Genome-Wide Association Study Smoking Meta-Analyses.

Journal Article (Journal Article)

INTRODUCTION: Genome-wide association study meta-analyses have robustly implicated three loci that affect susceptibility for smoking: CHRNA5\CHRNA3\CHRNB4, CHRNB3\CHRNA6 and EGLN2\CYP2A6. Functional follow-up studies of these loci are needed to provide insight into biological mechanisms. However, these efforts have been hampered by a lack of knowledge about the specific causal variant(s) involved. In this study, we prioritized variants in terms of the likelihood they account for the reported associations. METHODS: We employed targeted capture of the CHRNA5\CHRNA3\CHRNB4, CHRNB3\CHRNA6, and EGLN2\CYP2A6 loci and flanking regions followed by next-generation deep sequencing (mean coverage 78×) to capture genomic variation in 363 individuals. We performed single locus tests to determine if any single variant accounts for the association, and examined if sets of (rare) variants that overlapped with biologically meaningful annotations account for the associations. RESULTS: In total, we investigated 963 variants, of which 71.1% were rare (minor allele frequency < 0.01), 6.02% were insertion/deletions, and 51.7% were catalogued in dbSNP141. The single variant results showed that no variant fully accounts for the association in any region. In the variant set results, CHRNB4 accounts for most of the signal with significant sets consisting of directly damaging variants. CHRNA6 explains most of the signal in the CHRNB3\CHRNA6 locus with significant sets indicating a regulatory role for CHRNA6. Significant sets in CYP2A6 involved directly damaging variants while the significant variant sets suggested a regulatory role for EGLN2. CONCLUSIONS: We found that multiple variants implicating multiple processes explain the signal. Some variants can be prioritized for functional follow-up.

Full Text

Duke Authors

Cited Authors

  • Clark, SL; McClay, JL; Adkins, DE; Aberg, KA; Kumar, G; Nerella, S; Xie, L; Collins, AL; Crowley, JJ; Quakenbush, CR; Hillard, CE; Gao, G; Shabalin, AA; Peterson, RE; Copeland, WE; Silberg, JL; Maes, H; Sullivan, PF; Costello, EJ; van den Oord, EJ

Published Date

  • May 2016

Published In

Volume / Issue

  • 18 / 5

Start / End Page

  • 626 - 631

PubMed ID

  • 26283763

Pubmed Central ID

  • PMC5942610

Electronic International Standard Serial Number (EISSN)

  • 1469-994X

Digital Object Identifier (DOI)

  • 10.1093/ntr/ntv166


  • eng

Conference Location

  • England