Molecular Breeding

, 36:69 | Cite as

Marker imputation efficiency for genotyping-by-sequencing data in rice (Oryza sativa) and alfalfa (Medicago sativa)

  • Nelson Nazzicari
  • Filippo Biscarini
  • Paolo Cozzi
  • E. Charles Brummer
  • Paolo Annicchiarico
Article

Abstract

Genotyping-by-sequencing (GBS) is a rapid and cost-effective genome-wide genotyping technique applicable whether a reference genome is available or not. Due to the cost-coverage trade-off, however, GBS typically produces large amounts of missing marker genotypes, whose imputation becomes therefore both challenging and critical for later analyses. In this work, the performance of four general imputation methods (K-nearest neighbors, Random Forest, singular value decomposition, and mean value) and two genotype-specific methods (“Beagle” and FILLIN) was measured on GBS data from alfalfa (Medicago sativa L., autotetraploid, heterozygous, without reference genome) and rice (Oryza sativa L., diploid, 100 % homozygous, with reference genome). Alfalfa SNP were aligned on the genome of the closely related species Medicago truncatula L.. Benchmarks consisted in progressive data filtering for marker call rate (up to 70 %) and increasing proportions (up to 20 %) of known genotypes masked for imputation. The relative performance was measured as the total proportion of correctly imputed genotypes, globally and within each genotype class (two homozygotes in rice, two homozygotes and one heterozygote in alfalfa). We found that imputation accuracy was robust to increasing missing rates, and consistently higher in rice than in alfalfa. Accuracy was as high as 90–100 % for the major (most frequent) homozygous genotype, but dropped to 80–90 % (rice) and below 30 % (alfalfa) in the minor homozygous genotype. Beagle was the best performing method, both accuracy- and time-wise, in rice. In alfalfa, KNNI and RFI gave the highest accuracies, but KNNI was much faster.

Keywords

SNP Genotyping by sequencing (GBS) K-nearest neighbors imputation (KNNI) Random Forest imputation (RFI) Singular value decomposition imputation (SVDI) Beagle FILLIN Alfalfa Rice Imputation Reference genome 

Supplementary material

11032_2016_490_MOESM1_ESM.pdf (421 kb)
Supplementary material 1 (pdf 421 KB)

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Copyright information

© Springer Science+Business Media Dordrecht 2016

Authors and Affiliations

  • Nelson Nazzicari
    • 1
  • Filippo Biscarini
    • 2
  • Paolo Cozzi
    • 2
  • E. Charles Brummer
    • 3
  • Paolo Annicchiarico
    • 2
  1. 1.Council for Agricultural Research and Economics (CREA) Research Centre for Fodder Crops and Dairy ProductionsLodiItaly
  2. 2.Dipartimento di BioinformaticaFondazione Parco Tecnologico PadanoLodiItaly
  3. 3.Plant Sciences DepartmentUniversity of CaliforniaDavisUSA

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