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Related Experiment Videos

The bovine genome contains polymorphic microsatellites.

R Fries1, A Eggen, G Stranzinger

  • 1Institut für Nutztierwissenschaften, Eidgenössische Technische Hochschule, Zurich, Switzerland.

Genomics
|October 1, 1990
PubMed
Summary

Researchers identified abundant bovine microsatellites, which are short DNA sequences. These findings suggest dinucleotide repeat blocks are a rich source of DNA polymorphism in cattle, useful for genetic studies.

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Area of Science:

  • Genomics
  • Molecular Biology

Background:

  • Microsatellites, or dinucleotide repeats, are common in eukaryotic genomes.
  • Microsatellite polymorphisms are typically detected using polymerase chain reaction (PCR) and gel electrophoresis.

Purpose of the Study:

  • To identify bovine (cattle) DNA sequences containing specific dinucleotide repeat blocks.
  • To assess the potential of these repeats as a source of DNA polymorphism in cattle.

Main Methods:

  • Performed a sequence database search for bovine DNA with (CA)n, (AC)n, (GT)n, or (TG)n blocks (n ≥ 6).
  • Analyzed sequence variations in microsatellite regions from independent clones.
  • Examined PCR-amplified fragment length variation in the bovine steroid 21-hydroxylase gene.

Main Results:

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  • Identified 10 bovine sequences with specified dinucleotide repeat blocks.
  • Observed variations in repeat numbers within microsatellite regions.
  • Found length polymorphisms (186–216 nucleotides) in the steroid 21-hydroxylase gene among 43 unrelated cattle.

Conclusions:

  • Dinucleotide repeat blocks are prevalent in the bovine genome.
  • These microsatellites represent a significant and abundant source of DNA polymorphism in cattle.
  • The findings support the utility of microsatellites for genetic studies in cattle.