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Related Concept Videos

Genome-wide Association Studies-GWAS01:11

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Genome-wide association studies or GWAS are used to identify whether common SNPs are associated with certain diseases. Suppose specific SNPs are more frequently observed in individuals with a particular disease than those without the disease. In that case, those SNPs are said to be associated with the disease. Chi-square analysis is performed to check the probability of the allele likely to be associated with the disease.
GWAS does not require the identification of the target gene involved in...
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A Pathway Association Study Tool for GWAS Analyses of Metabolic Pathway Information
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Genome-Wide Association Study of Sweet Potato Storage Root Traits Using GWASpoly, a Gene Dosage-Sensitive Model.

Robert R Bowers1, Tyler J Slonecki2, Bode A Olukolu3

  • 1United States Department of Agriculture, Agricultural Research Service, United States Vegetable Laboratory, Charleston, SC 29414, USA.

International Journal of Molecular Sciences
|November 9, 2024
PubMed
Summary

Genome-wide association studies identified 21 genetic loci linked to sweet potato storage root traits like dry matter and color. This advances breeding for improved crop varieties and food security.

Keywords:
GWAS (genome-wide association study)Ipomoea batatasanthocyaninsbeta-carotenecarotenoidsstarchsweet potato

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Area of Science:

  • Plant genetics
  • Crop science
  • Agricultural biotechnology

Background:

  • Sweet potato (Ipomoea batatas) is vital for global food security but challenging to breed due to its complex polyploid genome.
  • Genome-wide association studies (GWAS) offer powerful tools for genetic characterization and improving breeding efficiency.

Purpose of the Study:

  • To identify genetic loci associated with key storage root traits in sweet potato.
  • To discover candidate genes influencing dry matter, flesh color, and skin color for marker-assisted breeding.

Main Methods:

  • Utilized GWASpoly on 384 USDA sweet potato accessions.
  • Analyzed 28 single nucleotide polymorphisms (SNPs) and 21 unique genetic loci.
  • Integrated reference genomes (I. batatas 'Beauregard' and I. trifida) to pinpoint candidate genes within 100 kb of significant SNPs.

Main Results:

  • Identified 21 genetic loci associated with storage root traits: 4 for dry matter, 5 for subjective flesh color, 3 for flesh hue angle, and 9 for subjective skin color/hue angle.
  • Located candidate genes including transcription factors (Myb, bHLH, WRKY), transporters, and enzymes involved in starch, carotenoid, and anthocyanin synthesis.
  • Confirmed previous findings and discovered novel loci for dry matter and beta-carotene content.

Conclusions:

  • This study provides valuable genetic resources for sweet potato breeding programs.
  • Understanding these genetic loci facilitates marker-assisted breeding for enhanced storage root characteristics.
  • The findings contribute to developing improved sweet potato varieties for better food security.