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Practical informatics approaches to microsatellite and variable number tandem repeat analysis.

Gerome Breen1

  • 1Division of Psychological Medicine and Social, Genetic and Developmental Psychiatry Centre, Institute of Psychiatry, King's College London, London, UK.

Methods in Molecular Biology (Clifton, N.J.)
|March 19, 2010
PubMed
Summary
This summary is machine-generated.

Polymorphic tandem repeats are a major source of genetic variation, influencing gene expression and disease risk. Understanding their analysis is crucial for genetic studies, despite recent neglect.

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Published on: June 23, 2012

Area of Science:

  • Genetics
  • Genomics
  • Bioinformatics

Background:

  • Polymorphic tandem repeats (PTRs) are the second most common source of genetic variation after single nucleotide polymorphisms (SNPs).
  • Over half a million PTRs exist in the human genome, with repeat units ranging from small (e.g., CA) to large (>100 nucleotides).
  • PTRs have been linked to complex disorders (diabetes, depression), pathogenic mutations (e.g., Huntington's Disease), and used in genetic mapping and forensics.

Purpose of the Study:

  • To highlight the functional significance of polymorphic tandem repeats (PTRs) in the human genome.
  • To emphasize the need for renewed attention to PTRs in genetic research.
  • To guide geneticists in analyzing PTRs for various applications.

Main Methods:

  • Review of existing literature on polymorphic tandem repeats.
  • Discussion of the functional roles and analytical approaches for PTRs.
  • Exploration of bioinformatics tools and laboratory methods for PTR analysis.

Main Results:

  • PTR alleles represent significant physical and chemical changes in DNA sequences.
  • PTRs can function as regulatory elements affecting gene expression (transcription factors, mRNA splicing).
  • PTRs can alter DNA structure and physical properties, making them strong functional candidates.

Conclusions:

  • Polymorphic tandem repeats are functionally significant genetic elements with diverse roles.
  • Despite their utility, PTRs have been relatively neglected in recent genetic studies compared to SNPs.
  • Geneticists require knowledge of PTR identification, annotation, bioinformatics analysis, and laboratory techniques for effective utilization.