Browsing by Author "Chao, Michael J."

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    Multi-omics integration analysis identifies novel genes for alcoholism with potential overlap with neurodegenerative diseases
    (Springer Nature, 2021-08-20) Kapoor, Manav; Chao, Michael J.; Johnson, Emma C.; Novikova, Gloriia; Lai, Dongbing; Meyers, Jacquelyn L.; Schulman, Jessica; Nurnberger, John I., Jr.; Porjesz, Bernice; Liu, Yunlong; Foroud, Tatiana; Edenberg, Howard J.; Marcora, Edoardo; Agrawal, Arpana; Goate, Alison; Medical and Molecular Genetics, School of Medicine
    Identification of causal variants and genes underlying genome-wide association study (GWAS) loci is essential to understand the biology of alcohol use disorder (AUD) and drinks per week (DPW). Multi-omics integration approaches have shown potential for fine mapping complex loci to obtain biological insights to disease mechanisms. In this study, we use multi-omics approaches, to fine-map AUD and DPW associations at single SNP resolution to demonstrate that rs56030824 on chromosome 11 significantly reduces SPI1 mRNA expression in myeloid cells and lowers risk for AUD and DPW. Our analysis also identifies MAPT as a candidate causal gene specifically associated with DPW. Genes prioritized in this study show overlap with causal genes associated with neurodegenerative disorders. Multi-omics integration analyses highlight, genetic similarities and differences between alcohol intake and disordered drinking, suggesting molecular heterogeneity that might inform future targeted functional and cross-species studies.
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    Polygenic contributions to alcohol use and alcohol use disorders across population-based and clinically ascertained samples
    (Cambridge University Press, 2021) Johnson, Emma C.; Sanchez-Roige, Sandra; Acion, Laura; Adams, Mark J.; Bucholz, Kathleen K.; Chan, Grace; Chao, Michael J.; Chorlian, David B.; Dick, Danielle M.; Edenberg, Howard J.; Foroud, Tatiana; Hayward, Caroline; Heron, Jon; Hesselbrock, Victor; Hickman, Matthew; Kendler, Kenneth S.; Kinreich, Sivan; Kramer, John; Kuo, Sally I-Chun; Kuperman, Samuel; Lai, Dongbing; McIntosh, Andrew M.; Meyers, Jacquelyn L.; Plawecki, Martin H.; Porjesz, Bernice; Porteous, David; Schuckit, Marc A.; Su, Jinni; Zang, Yong; Palmer, Abraham A.; Agrawal, Arpana; Clarke, Toni-Kim; Edwards, Alexis C.; Biochemistry and Molecular Biology, School of Medicine
    Background: Studies suggest that alcohol consumption and alcohol use disorders have distinct genetic backgrounds. Methods: We examined whether polygenic risk scores (PRS) for consumption and problem subscales of the Alcohol Use Disorders Identification Test (AUDIT-C, AUDIT-P) in the UK Biobank (UKB; N = 121 630) correlate with alcohol outcomes in four independent samples: an ascertained cohort, the Collaborative Study on the Genetics of Alcoholism (COGA; N = 6850), and population-based cohorts: Avon Longitudinal Study of Parents and Children (ALSPAC; N = 5911), Generation Scotland (GS; N = 17 461), and an independent subset of UKB (N = 245 947). Regression models and survival analyses tested whether the PRS were associated with the alcohol-related outcomes. Results: In COGA, AUDIT-P PRS was associated with alcohol dependence, AUD symptom count, maximum drinks (R2 = 0.47-0.68%, p = 2.0 × 10-8-1.0 × 10-10), and increased likelihood of onset of alcohol dependence (hazard ratio = 1.15, p = 4.7 × 10-8); AUDIT-C PRS was not an independent predictor of any phenotype. In ALSPAC, the AUDIT-C PRS was associated with alcohol dependence (R2 = 0.96%, p = 4.8 × 10-6). In GS, AUDIT-C PRS was a better predictor of weekly alcohol use (R2 = 0.27%, p = 5.5 × 10-11), while AUDIT-P PRS was more associated with problem drinking (R2 = 0.40%, p = 9.0 × 10-7). Lastly, AUDIT-P PRS was associated with ICD-based alcohol-related disorders in the UKB subset (R2 = 0.18%, p < 2.0 × 10-16). Conclusions: AUDIT-P PRS was associated with a range of alcohol-related phenotypes across population-based and ascertained cohorts, while AUDIT-C PRS showed less utility in the ascertained cohort. We show that AUDIT-P is genetically correlated with both use and misuse and demonstrate the influence of ascertainment schemes on PRS analyses.