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Published on: March 9, 2015
HumCD4--validation of a STR system for forensic purposes in an Austrian Caucasian population sample
1Institute for Legal Medicine, University, Graz, Austria.
Insights
The HumCD4 short tandem repeat system shows high discriminatory power (0.850) for forensic analysis in Austrian Caucasians. This polymerase chain reaction (PCR) method is robust, even with degraded DNA samples.
Area of Science:
- Forensic genetics
- Human population genetics
Background:
- Short tandem repeat (STR) markers are crucial for human identification.
- The HumCD4 locus is a valuable STR system for forensic applications.
Purpose of the Study:
- To evaluate the HumCD4 STR system in an Austrian Caucasian population.
- To assess the forensic efficiency and robustness of the HumCD4 marker.
Main Methods:
- Polymerase chain reaction (PCR) amplification of the HumCD4 STR locus.
- Analysis using horizontal, non-denaturing polyacrylamide gel electrophoresis.
- DNA typing performed on 304 unrelated individuals and 100 families.
Main Results:
- High discriminating power (0.850) and heterozygosity rate (0.628) observed.
- Phenotype distribution conforms to Hardy-Weinberg equilibrium.
- Successful amplification demonstrated with as little as 80 pg DNA and from degraded samples (bloodstains, boiled DNA).
Conclusions:
- The HumCD4 STR system is highly effective for forensic identification in the studied population.
- The method is robust and performs well even with limited or degraded DNA.
- A duplex PCR assay combining HumCD4 and TH01 is proposed for enhanced forensic efficiency.
Abstract:
The short tandem repeat system HumCD4 was amplified by the polymerase chain reaction (PCR) on blood samples from 304 unrelated Austrian Caucasians and analyzed by horizontal, non-denaturing polyacrylamide electrophoresis. The mean exclusion chance was 0.417, the discriminating power 0.850 and the heterozygosity rate 0.628. The observed phenotype distribution is in Hardy-Weinberg equilibrium. In 100 families (200 meioses) no mutations were found. Sufficient amplification could be achieved with as little as 80 pg of high molecular weight cell-line DNA. In a degradation experiment DNA extracted from bloodstains stored for up to 28 days in a moist chamber and DNA boiled for up to 18 min could be amplified. A duplex PCR with TH01 is proposed.
