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Microsatellite analysis in human disease.

J Koreth1, C J, J O McGee

  • 1Nuffield Department of Pathology and Bacteriology, John Radcliffe Hospital, University of Oxford, UK.

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Microsatellites, also known as short tandem repeats (STRs), are valuable genetic markers due to their high heterozygosity and ease of use with PCR. They are essential for constructing human linkage maps and dissecting complex genetic traits.

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Area of Science:

  • Genetics
  • Genomics
  • Molecular Biology

Background:

  • Microsatellites, or short tandem repeats (STRs), are repetitive DNA sequences found throughout the genome.
  • These sequences, typically (dA-dC)n repeats, exhibit high polymorphism and Mendelian codominant inheritance.

Purpose of the Study:

  • To highlight the utility of microsatellites as genetic markers.
  • To emphasize their role in constructing linkage maps and analyzing complex traits.

Main Methods:

  • Utilizing polymerase chain reaction (PCR) for microsatellite typing.
  • Leveraging high heterozygosity and codominant inheritance for genetic mapping.

Main Results:

  • The human genome contains an estimated 12,000 microsatellites with significant polymorphic information content (PIC).
  • A human microsatellite linkage map comprises over 5264 loci with >70% heterozygosity, spaced at an average of 1.6 centiMorgans (cM).

Conclusions:

  • Microsatellites are the preferred markers for human and model organism linkage map construction.
  • These maps serve as crucial resources for the genetic dissection of complex diseases like type I diabetes.