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2015 ; 23
(4
): 523-9
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Phenome-wide association studies (PheWASs) for functional variants
#MMPMID25074467
Ye Z
; Mayer J
; Ivacic L
; Zhou Z
; He M
; Schrodi SJ
; Page D
; Brilliant MH
; Hebbring SJ
Eur J Hum Genet
2015[Apr]; 23
(4
): 523-9
PMID25074467
show ga
The genome-wide association study (GWAS) is a powerful approach for studying the
genetic complexities of human disease. Unfortunately, GWASs often fail to
identify clinically significant associations and describing function can be a
challenge. GWAS is a phenotype-to-genotype approach. It is now possible to
conduct a converse genotype-to-phenotype approach using extensive electronic
medical records to define a phenome. This approach associates a single genetic
variant with many phenotypes across the phenome and is called a phenome-wide
association study (PheWAS). The majority of PheWASs conducted have focused on
variants identified previously by GWASs. This approach has been efficient for
rediscovering gene-disease associations while also identifying pleiotropic
effects for some single-nucleotide polymorphisms (SNPs). However, the use of SNPs
identified by GWAS in a PheWAS is limited by the inherent properties of the GWAS
SNPs, including weak effect sizes and difficulty when translating discoveries to
function. To address these challenges, we conducted a PheWAS on 105 presumed
functional stop-gain and stop-loss variants genotyped on 4235 Marshfield Clinic
patients. Associations were validated on an additional 10?640 Marshfield Clinic
patients. PheWAS results indicate that a nonsense variant in ARMS2 (rs2736911) is
associated with age-related macular degeneration (AMD). These results demonstrate
that focusing on functional variants may be an effective approach when conducting
a PheWAS.
|*Phenotype
[MESH]
|*Polymorphism, Single Nucleotide
[MESH]
|Databases, Genetic
[MESH]
|Electronic Health Records
[MESH]
|Genetic Predisposition to Disease/genetics
[MESH]