novel findings in genomics and metabolomics in the aric study€¦ · systolic bp 1.30 (0.43) 0.002...
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Novel Findings in Genomicsand Metabolomics in the
ARIC study
Eric BoerwinkleBoston, MAMay, 2017
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Goals of Genetic Studies(of the Metabolome)
• Genes being novel predictors of disease• Predictors vs Biomarkers and the principal
of Mendelian Randomization• Biology of the human metabolome• Drug Target Discovery• Gene x Environment Interaction
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Maximizing Opportunity for Discovery↑ Power, while controlling costs
Read-outs of G x E, e.g. microbiome, metabolome, methylation
Phenotype definition, especially endophenotypes
Study Design (sample size, special populations, and families)
Improved Analysis,e.g. SVs and Annotation
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Multi-Omics Integration
Achieving this vision, requires delivering large amounts of high quality data to the community in a timely manner.
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The Atherosclerosis Risk in Communities (ARIC)
Study
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1,679 African-Americans (AAs) among the ARIC study
1,458 ARIC European Americans (EAs)
Having metabolomics data
Prediction of Incident Disease
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Metabolomics in the ARIC study
Detectable
RepeatableICC ≥0.6
missingness<80%
COMPOUND TYPE COUNTNamed Metabolites 361
Unnamed Metabolites 241Total Number of
Measured Metabolites 602
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COMPOUND TYPE COUNTNamed Metabolites 118
Unnamed Metabolites 86
Total Number 204
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Why Multi-Ethnic Studies?• Differences in Environment• Differences in site frequency
spectrum• G x E• Epidemiology of Disease
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Genomics
Advances in Genomics & Metabolome
MetabolomicsCandidate
Gene
GWAS
Exome Chip
Whole Exome Seq
Whole Genome Seq
Targeted Metabolomics
Untargeted Metabolomics
NMR
GC-MS/LC-MS
HILIC-MS
CE-MS
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Genomics
CandidateGene
Advances in Genomics & Metabolome
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HAL, Histidine and Coronary Heart Disease
Yu, Circ Cardiovasc Genet, 2015 10
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Advances in Genomics & Metabolome
Genomics
CandidateGene
GWAS
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GWAS on Metabolomics
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Common variants with p-value < 1.610-10
biliverdinUGT1A
(rs887829, T, 0.32, 8%)
bilirubin (Z,Z)
UGT1A(rs887829, T,
0.34, 5%) [H]HWESASLLR[OH]
ACE(rs4343, A, 0.35, 7%)
aspartylphenylalanine
ACE(rs4343, G, 0.22, 8%)
threonylphenylalanine
ACE(rs4363, G, 0.21, 6%)
creatineGATM
(rs2433610, T, 0.09, 5%)
glycineCPS1
(rs7422339, A, 0.10, 5%)
N-acetylphenylalanine
ACY3(rs12288023, C,
0.27, 5%)
phenylacetate
ACSM2B(rs7499271, A,
0.25, 5%)
3-hydroxydecanoateTHEM4
(rs10788817,G, 0.11, 5%)
acetylcarnitine
SIAE(rs12282107, C,
0.29, 6%)
deoxycarnitineSLC6A13
(rs555044, A, 0.07, 4%)
hexadecanedioate
ADH4(rs17028615, A,
0.19, 7%)
palmitoleate(16:1n7)PKD2L1
(rs603424, G, 0.11, 5%)
trehaloseTREH
(rs507080, A, 0.51, 10%)
Cofactors and vitamins Peptide
Lipid Amino acid
Carbohydratebilirubin
(E,E)UGT1A
(rs887829, T,0.32, 7%)
HXGXAKLKB1
(rs3733402, A, 0.44, 9%)
LEU-PHEKLKB1
(rs3733402, A, 0.28, 8%)
N-acetylornithine
NAT8(rs13538, A, 0.30, 20%)
Genome-wide Significant Gene-Metabolite Pairs
in 1,679 ARIC African Americans
Yu, PLoS Genet, 201413
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Common variants with p-value < 1.610-10
biliverdinUGT1A
(rs887829, T, 0.32, 8%)
bilirubin (Z,Z)
UGT1A(rs887829, T,
0.34, 5%) [H]HWESASLLR[OH]
ACE(rs4343, A, 0.35, 7%)
aspartylphenylalanine
ACE(rs4343, G, 0.22, 8%)
threonylphenylalanine
ACE(rs4363, G, 0.21, 6%)
creatineGATM
(rs2433610, T, 0.09, 5%)
glycineCPS1
(rs7422339, A, 0.10, 5%)
N-acetylphenylalanine
ACY3(rs12288023, C,
0.27, 5%)
phenylacetate
ACSM2B(rs7499271, A,
0.25, 5%)
3-hydroxydecanoateTHEM4
(rs10788817,G, 0.11, 5%)
acetylcarnitine
SIAE(rs12282107, C,
0.29, 6%)
deoxycarnitineSLC6A13
(rs555044, A, 0.07, 4%)
hexadecanedioate
ADH4(rs17028615, A,
0.19, 7%)
palmitoleate(16:1n7)PKD2L1
(rs603424, G, 0.11, 5%)
trehaloseTREH
(rs507080, A, 0.51, 10%)
Cofactors and vitamins Peptide
Lipid Amino acid
Carbohydratebilirubin
(E,E)UGT1A
(rs887829, T,0.32, 7%)
HXGXAKLKB1
(rs3733402, A, 0.44, 9%)
LEU-PHEKLKB1
(rs3733402, A, 0.28, 8%)
N-acetylornithine
NAT8(rs13538, A, 0.30, 20%)
Genome-wide Significant Gene-Metabolite Pairs
in 1,679 ARIC African Americans
Yu, PLoS Genet, 201414
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NAT8 and Chronic Kidney Disease
Caucasians
NAT8
Chronic kidney disease
N-acetlylornithine
African Americans
NAT8(rs13538, missense)
Chronic kidney diseaseN-actlylornithine
Kottgen A, et al. Nat Genet, 2010
Suhre KNature, 2011
Hypothesis 1: NAT8 – N-acetlyornithine – chronic kidney disease?
cross-sectional ?longitudinal?
Baseline eGFR ( p = 2.710-14 )Incident CKD (p = 0.004)
risk allele: Ap = 4.010-66
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Advances in Genomics & Metabolome
Genomics
CandidateGene
GWAS
Exome Chip
Whole Exome Seq
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Why Sequencing?
McCarthy, Nat Reviews Genet, 2009 17
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Defining LOF
• Variants predicted to trigger nonsense-mediated decay (NMD)
• Categories:1) Premature stop codon-introducing2) Disrupt essential splice site3) Insertion/deletion frameshifts
(indel)
• Additional Subdivision: • Full: all known protein coding
transcripts• Partial: affecting only a fraction of
known coding transcriptsImage via: http://compbio.berkeley.edu/people/ed/rust/ 18
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Annotating LOF
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• 8,554 ARIC Study participants • 5,718 EA and 2,836 AA• (4,277 disc and 4,277 repl)
• Variant filtering:• Single-exon genes• Non protein-coding genes• Affect all gene isoforms• Terminal gene exon
• 36,787 LOF sites in 11,922 genes
• Average per individual:• Heterozygous (homozygous)
LOF type Initial After filtering
% Filtered out (Low-Confidence)
Stop gain 19,759 14,076 28.7%Splice 10,634 8,843 16.8%
Frame Shift 33,703 13,868 58.8%Total 64,096 36,787
LOF type AA EA
Stop gain 27.3 (2.1) 21.1 (2.2)
Splice 16.7 (1.9) 9.6 (1.8)
Frame Shift 36.1 (4.4) 22.6 (3.1)
Total 80.1 (8.4) 53.3 (7.1)
FHS: phs000651.v4.p9; CHS: phs000667.v1.p1; ARIC phs000668.v1.p1
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324 single LoF varaints (MAF ≥ 5%),1285 genes with cMAC ≥ 7 included,p-value < 1.3 × 10-7
Significant LoF mutation metabolite pairs
Yu, Sci Adv, 2016 20
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SLCO1B1, Hexadecanedioate & Heart Failure
Yu, Sci Adv, 2016 21
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Possible Mechanism of the Association
250 mg/kg/day hexadecanedioate feeding
European-Americans (n = 1,551)
African-Americans (n = 2,448)
Beta (SE) p-value Beta (SE) p-valueSystolic BP 1.30 (0.43) 0.002 3.38 (0.61) 4E-8
Diastolic BP 0.74 (0.26) 0.004 1.33 (0.360 2E-4
C. Menni et al., Metabolomic identification of a novel pathway of blood pressureregulation involving hexadecanedioate. Hypertension 66, 422 (Aug, 2015).
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Advances in Genomics & Metabolome
Genomics
CandidateGene
GWAS
Exome Chip
Whole Exome Seq
Whole Genome Seq
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The genomes were annotated by ANNOVAR based on the RefSeq database
Whole Genome Composition
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From G. Abecasis
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Aggregate by annotated functional motif for low frequency and rare SNVs (MAF ≤ 5%):
Sliding windowRegulatory domainFirst intron
Analytic ApproachWGS Annotation is Key
26WGS Annotation Tool: WGSA (Liu et al, J Med Genet, 2015)
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2 significant sliding windows (p < 4e-8), 6kb downstream of
AGArs11131799, the most significant common variant
Functional coding variants (MAF < 5%) in AGA aggregately affect asparagine levels
Asparagine:
o A non-essential amino acid;o Biosynthesis/diet intake;o Required for development and function of the brain.
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rs11131799 (1st intron of AGA):
o Predicted promoter;
o Influences the expression levels of AGA (p = 0.01).
AGA gene:
o Aspartylglucosaminidase
o cleaves asparagine from N-acetylglucosamine.
AGA
expr
essio
n le
vels
Aspa
ragi
ne le
vels
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Multi-Omics Integration
Achieving this vision, requires delivering large amounts of high quality data to the community in a timely manner.
29
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Identification of “Causal” Pathways among the Serum Metabolome
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• As shown above, the principal of Mendelian randomization can lend credence to claims of causal inference.
• This principal of Mendelian randomization can extend to information across the genome.
• We (Yazdani, 2016) have combined the principal of genome-wide Mendelian randomization with Directed Acyclic Graph algorithms. (GDAG).
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Metabolomic-Triglycerides Network
Yazdani et. al, (2016). Metabolomics
In total, 9 metabolites have direct a effect on triglyceride levels.
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Acknowledgments
University of Texas Health Science Center at HoustonBing YuMandana YazdaniElena FeofanovaPaul de VriesXiaoming LiuAlanna Morrison
Baylor College of MedicineGinger Metcalf Fuli YuDonna MuznyRichard Gibbs
Framingham Heart StudyRobert GersztenEugene RheeDan LevyVasan Ramachandran
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Atherosclerosis Risk in Communities StudyChristie BallantyneJosef Coresh