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Mutation rate at commonly used forensic STR loci: paternity testing experience.
Faruk Aşicioglu1, Fatma Oguz-Savran, Ugur Ozbek
1The Council of Forensic Medicine, Cerrahpaşa, 34300, Istanbul, Turkey.
Disease Markers
|January 25, 2005
Summary
Short tandem repeat (STR) DNA mutations can complicate paternity testing. Our study identified 12 mutations across 7 STR loci, with the D8S1179 locus showing the highest mutation rate, crucial for forensic DNA analysis.
Area of Science:
- Genetics
- Forensic Science
- Molecular Biology
Background:
- Paternity testing relies on analyzing hypervariable short tandem repeat (STR) DNA loci.
- Microsatellite sequences exhibit higher mutation rates compared to bulk DNA.
- Germline mutations at STR loci present challenges in interpreting genetic profiles.
Purpose of the Study:
- To analyze parent/child allele transfers at 13 microsatellite loci.
- To identify and quantify the occurrence of mutations at STR loci.
- To determine mutation rates for specific STR loci.
Main Methods:
- Analysis of 59-159 parent/child allele transfers.
- Examination of 13 distinct microsatellite loci.
- Identification and characterization of germline mutations.
Main Results:
- Twelve mutations were identified across 7 of the 13 microsatellite loci analyzed.
- No mutations were observed in the remaining 6 loci.
- The D8S1179 locus exhibited the highest mutation rate (5 mutations), with events related to single repeat changes. Mutation rates ranged from 0 to 1.5 x 10(-2) per locus per gamete per generation.
Conclusions:
- STR mutations are a critical factor in forensic DNA testing and paternity analysis.
- Accumulating STR mutation data is essential for accurate genetic profile interpretation.
- Understanding mutation rates aids in refining forensic DNA testing methodologies.