Best practices for analyzing imputed genotypes from low-pass sequencing in dogs.
Mamm Genome
; 33(1): 213-229, 2022 03.
Article
em En
| MEDLINE
| ID: mdl-34498136
ABSTRACT
Although DNA array-based approaches for genome-wide association studies (GWAS) permit the collection of thousands of low-cost genotypes, it is often at the expense of resolution and completeness, as SNP chip technologies are ultimately limited by SNPs chosen during array development. An alternative low-cost approach is low-pass whole genome sequencing (WGS) followed by imputation. Rather than relying on high levels of genotype confidence at a set of select loci, low-pass WGS and imputation rely on the combined information from millions of randomly sampled low-confidence genotypes. To investigate low-pass WGS and imputation in the dog, we assessed accuracy and performance by downsampling 97 high-coverage (> 15×) WGS datasets from 51 different breeds to approximately 1× coverage, simulating low-pass WGS. Using a reference panel of 676 dogs from 91 breeds, genotypes were imputed from the downsampled data and compared to a truth set of genotypes generated from high-coverage WGS. Using our truth set, we optimized a variant quality filtering strategy that retained approximately 80% of 14 M imputed sites and lowered the imputation error rate from 3.0% to 1.5%. Seven million sites remained with a MAF > 5% and an average imputation quality score of 0.95. Finally, we simulated the impact of imputation errors on outcomes for case-control GWAS, where small effect sizes were most impacted and medium-to-large effect sizes were minorly impacted. These analyses provide best practice guidelines for study design and data post-processing of low-pass WGS-imputed genotypes in dogs.
Texto completo:
1
Bases de dados:
MEDLINE
Assunto principal:
Polimorfismo de Nucleotídeo Único
/
Estudo de Associação Genômica Ampla
Tipo de estudo:
Guideline
/
Observational_studies
/
Risk_factors_studies
Limite:
Animals
Idioma:
En
Revista:
Mamm Genome
Assunto da revista:
GENETICA
Ano de publicação:
2022
Tipo de documento:
Article
País de afiliação:
Estados Unidos