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DXS101: a highly polymorphic X-linked STR.

J Edelmann1, R Szibor

  • 1Institute of Legal Medicine, University of Leipzig, Johannisallee 28, 04103 Leipzig, Germany. edej@server3.medizin.uni-leipzig.de

International Journal of Legal Medicine
|May 18, 2001
PubMed
Summary
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This study validates the DXS101 microsatellite marker, an X-linked genetic tool, for forensic applications. Its high polymorphism and reliability make it valuable for identifying individuals and relationships.

Area of Science:

  • Genetics
  • Forensic Science
  • Population Genetics

Background:

  • Microsatellite markers are crucial for genetic analysis.
  • X-linked markers offer unique advantages in certain forensic scenarios.
  • DXS101 is a trinucleotide repeat polymorphism on the X chromosome.

Purpose of the Study:

  • To characterize the DXS101 microsatellite marker.
  • To evaluate its utility for forensic identification.
  • To assess its population genetic parameters in a Caucasian sample.

Main Methods:

  • Sequence and population genetic data analysis.
  • Polymorphism Information Content (PIC) and Mean Exclusion Chance (MEC) calculation.
  • Hardy-Weinberg equilibrium (HWE) testing and kinship analysis.

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Main Results:

  • DXS101 exhibits high polymorphism with 18 alleles (179-233 bp).
  • Achieved PIC of 0.884 and MEC of 0.879 in a Caucasian population.
  • Demonstrated typical X-linked inheritance, no mutations in 340 meioses, and no HWE deviation.

Conclusions:

  • DXS101 is a highly polymorphic and reliable X-linked microsatellite marker.
  • Its genetic characteristics support its use as a forensic tool.
  • DXS101 can be co-tested with unlinked marker DXS6807.