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Repeated sequences as genetic markers in pooled tissue samples

R P Hellens1, T H Ellis, D Lee

  • 1John Innes Institute, Norwich, UK.

Plant Molecular Biology
|April 1, 1993
PubMed
Summary
This summary is machine-generated.

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Dispersed repeated DNA sequences, like the PDR1 element in pea, efficiently create genetic markers linked to traits. Hybridization patterns in pooled DNA reveal these markers and estimate linkage distance.

Area of Science:

  • Plant genetics
  • Molecular biology
  • Genomics

Background:

  • Genetic markers are crucial for trait analysis and breeding.
  • Identifying and utilizing dispersed repeated DNA sequences can enhance marker development.

Purpose of the Study:

  • To demonstrate the utility of dispersed repeated sequences for generating genetic markers.
  • To establish a method for detecting markers linked to traits using DNA hybridization.
  • To explore the estimation of linkage distance using band intensity ratios.

Main Methods:

  • Utilizing the PDR1 element from pea as a dispersed repeated sequence.
  • Analyzing hybridization patterns of repeated sequences against pooled DNA from different genotypes.
  • Calculating intensity ratios from band differences in hybridization patterns.

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Main Results:

  • Dispersed repeated sequences of moderate copy number serve as efficient tools for marker generation.
  • Hybridization to pooled DNA is a sensitive method for detecting these markers.
  • Simultaneous sampling of numerous unlinked loci acts as internal controls.
  • Intensity ratios provide a rough estimate of genetic linkage distance.

Conclusions:

  • Dispersed repeated sequences offer a simple and effective approach for developing genetic markers linked to specific traits.
  • The described hybridization method is sensitive and allows for genome-wide sampling.
  • Quantitative analysis of band patterns can aid in genetic mapping studies.