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Polymorphic (AAT) in trinucleotide repeats derived from a human brain cDNA library

R L Margolis1, T S Breschel, S H Li

  • 1Department of Psychiatry and Behavioral Sciences, Johns Hopkins University School of Medicine, Baltimore, MD 21205-2196, USA.

Human Genetics
|October 1, 1995
PubMed
Summary

Researchers identified seven polymorphic (adenine-adenine-thymine)n trinucleotide repeats in human brain cDNA. These genetic markers show potential for disease association studies and understanding expansion mutation disorders.

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Area of Science:

  • Genetics
  • Molecular Biology
  • Neuroscience

Background:

  • Trinucleotide repeats are repetitive DNA sequences.
  • Polymorphic repeats exhibit variations in length among individuals.
  • Expansion mutations in such repeats are linked to several neurological disorders.

Purpose of the Study:

  • To identify and characterize polymorphic (adenine-adenine-thymine)n trinucleotide repeats in the human brain.
  • To map the identified repeats to specific chromosomal loci.
  • To evaluate their potential as genetic markers for diseases.

Main Methods:

  • Isolation of cDNA fragments from a human brain cDNA library.
  • Analysis of (AAT)n trinucleotide repeat sequences for polymorphism.
  • Linkage analysis for mapping repeats to specific genetic loci.

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Main Results:

  • Seven distinct cDNA fragments containing polymorphic (AAT)n repeats were successfully isolated.
  • These repeats were mapped to specific loci within the human genome.
  • The identified repeats represent novel genetic markers.

Conclusions:

  • The isolated polymorphic (AAT)n repeats are valuable genetic markers.
  • These markers can be utilized in studies of human genetic diseases.
  • They offer potential for investigating diseases caused by trinucleotide repeat expansion mutations.