TY - JOUR
T1 - A genome wide association study of fast beta EEG in families of European ancestry
AU - Meyers, Jacquelyn L.
AU - Zhang, Jian
AU - Manz, Niklas
AU - Rangaswamy, Madhavi
AU - Kamarajan, Chella
AU - Wetherill, Leah
AU - Chorlian, David B.
AU - Kang, Sun J.
AU - Bauer, Lance
AU - Hesselbrock, Victor
AU - Kramer, John
AU - Kuperman, Samuel
AU - Nurnberger, John I.
AU - Tischfield, Jay
AU - Wang, Jen Chyong
AU - Edenberg, Howard J.
AU - Goate, Alison
AU - Foroud, Tatiana
AU - Porjesz, Bernice
N1 - Publisher Copyright:
© 2016 Elsevier B.V.
PY - 2017/5/1
Y1 - 2017/5/1
N2 - Background Differences in fast beta (20–28 Hz) electroencephalogram (EEG) oscillatory activity distinguish some individuals with psychiatric and substance use disorders, suggesting that it may be a useful endophenotype for studying the genetics of disorders characterized by neural hyper-excitability. Despite the high heritability estimates provided by twin and family studies, there have been relatively few genetic studies of beta EEG, and to date only one genetic association finding has replicated (i.e., GABRA2). Method In a sample of 1564 individuals from 117 families of European Ancestry (EA) drawn from the Collaborative Study on the Genetics of Alcoholism (COGA), we performed a Genome-Wide Association Study (GWAS) on resting-state fronto-central fast beta EEG power, adjusting regression models for family relatedness, age, sex, and ancestry. To further characterize genetic findings, we examined the functional and behavioral significance of GWAS findings. Results Three intronic variants located within DSE (dermatan sulfate epimerase) on 6q22 were associated with fast beta EEG at a genome wide significant level (p < 5 × 10− 8). The most significant SNP was rs2252790 (p < 2.6 × 10− 8; MAF = 0.36; β = 0.135). rs2252790 is an eQTL for ROS1 expressed most robustly in the temporal cortex (p = 1.2 × 10− 6) and for DSE/TSPYL4 expressed most robustly in the hippocampus (p = 7.3 × 10− 4; β = 0.29). Previous studies have indicated that DSE is involved in a network of genes integral to membrane organization; gene-based tests indicated that several variants within this network (i.e., DSE, ZEB2, RND3, MCTP1, and CTBP2) were also associated with beta EEG (empirical p < 0.05), and of these genes, ZEB2 and CTBP2 were associated with DSM-V Alcohol Use Disorder (AUD; empirical p < 0.05).’ Discussion In this sample of EA families enriched for AUDs, fast beta EEG is associated with variants within DSE on 6q22; the most significant SNP influences the mRNA expression of DSE and ROS1 in hippocampus and temporal cortex, brain regions important for beta EEG activity. Gene-based tests suggest evidence of association with related genes, ZEB2, RND3, MCTP1, CTBP2, and beta EEG. Converging data from GWAS, gene expression, and gene-networks presented in this study provide support for the role of genetic variants within DSE and related genes in neural hyperexcitability, and has highlighted two potential candidate genes for AUD and/or related neurological conditions: ZEB2 and CTBP2. However, results must be replicated in large, independent samples.
AB - Background Differences in fast beta (20–28 Hz) electroencephalogram (EEG) oscillatory activity distinguish some individuals with psychiatric and substance use disorders, suggesting that it may be a useful endophenotype for studying the genetics of disorders characterized by neural hyper-excitability. Despite the high heritability estimates provided by twin and family studies, there have been relatively few genetic studies of beta EEG, and to date only one genetic association finding has replicated (i.e., GABRA2). Method In a sample of 1564 individuals from 117 families of European Ancestry (EA) drawn from the Collaborative Study on the Genetics of Alcoholism (COGA), we performed a Genome-Wide Association Study (GWAS) on resting-state fronto-central fast beta EEG power, adjusting regression models for family relatedness, age, sex, and ancestry. To further characterize genetic findings, we examined the functional and behavioral significance of GWAS findings. Results Three intronic variants located within DSE (dermatan sulfate epimerase) on 6q22 were associated with fast beta EEG at a genome wide significant level (p < 5 × 10− 8). The most significant SNP was rs2252790 (p < 2.6 × 10− 8; MAF = 0.36; β = 0.135). rs2252790 is an eQTL for ROS1 expressed most robustly in the temporal cortex (p = 1.2 × 10− 6) and for DSE/TSPYL4 expressed most robustly in the hippocampus (p = 7.3 × 10− 4; β = 0.29). Previous studies have indicated that DSE is involved in a network of genes integral to membrane organization; gene-based tests indicated that several variants within this network (i.e., DSE, ZEB2, RND3, MCTP1, and CTBP2) were also associated with beta EEG (empirical p < 0.05), and of these genes, ZEB2 and CTBP2 were associated with DSM-V Alcohol Use Disorder (AUD; empirical p < 0.05).’ Discussion In this sample of EA families enriched for AUDs, fast beta EEG is associated with variants within DSE on 6q22; the most significant SNP influences the mRNA expression of DSE and ROS1 in hippocampus and temporal cortex, brain regions important for beta EEG activity. Gene-based tests suggest evidence of association with related genes, ZEB2, RND3, MCTP1, CTBP2, and beta EEG. Converging data from GWAS, gene expression, and gene-networks presented in this study provide support for the role of genetic variants within DSE and related genes in neural hyperexcitability, and has highlighted two potential candidate genes for AUD and/or related neurological conditions: ZEB2 and CTBP2. However, results must be replicated in large, independent samples.
KW - Electrophysiology
KW - Endophenotype
KW - Genome-Wide Association Study (GWAS)
KW - Resting EEG
UR - http://www.scopus.com/inward/record.url?scp=85010953537&partnerID=8YFLogxK
U2 - 10.1016/j.ijpsycho.2016.12.008
DO - 10.1016/j.ijpsycho.2016.12.008
M3 - Article
C2 - 28040410
AN - SCOPUS:85010953537
SN - 0167-8760
VL - 115
SP - 74
EP - 85
JO - International Journal of Psychophysiology
JF - International Journal of Psychophysiology
ER -