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Two loci concurrent mutations in non-exclusion parentage cases using 19 STR profiles.

Qiu-Ling Liu1, Ye-Fei Chen2, Yu Zang2

  • 1Faculty of Forensic Medicine, Zhongshan School of Medicine, Sun Yat-sen University, 74 Zhongshan 2nd Road, Guangzhou 510080, China; Guangdong Province Translational Forensic Medicine Engineering Technology Research Center, Sun Yat-sen University, 74 Zhongshan 2nd Road, Guangzhou 510080, China.

Legal Medicine (Tokyo, Japan)
|October 3, 2018
PubMed
Summary
This summary is machine-generated.

Concurrent mutations at two short tandem repeat (STR) loci were observed in paternity testing. The study found a higher mutation rate than expected, suggesting a need for larger sample sizes to accurately estimate human mutation rates.

Keywords:
MutationsPaternity testingSTR

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Area of Science:

  • Forensic Genetics
  • Human Population Genetics

Background:

  • Paternity testing relies on short tandem repeat (STR) loci analysis.
  • Understanding mutation rates is crucial for accurate genetic identification.

Purpose of the Study:

  • To investigate concurrent mutations at two STR loci in paternity cases.
  • To compare observed mutation frequencies with theoretical expectations.

Main Methods:

  • Analysis of 9508 family trios using 19 STR loci from the Goldeneye™ DNA ID System 20A.
  • Paternity index (PI) threshold set at >10,000.
  • Confirmation of paternity using an additional 19 STR markers.

Main Results:

  • Fourteen families exhibited mutations at two STR loci.
  • Observed probability of dual locus mutations significantly exceeded binomial model expectations.
  • Mutation characteristics aligned with previously reported findings.

Conclusions:

  • Larger sample sizes are required for accurate estimation of STR mutation rates.
  • Further research is needed to understand multi-locus mutations and human mutation characterization.