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Presentation of a three-banded allele pattern--analysis and interpretation
Ashira Zamir1, Moshe Shpitzen, Carla Oz
1Forensic Biology Laboratory, Division of Identification and Forensic Science, Israel Police, National HQ, Jerusalem.
Journal of Forensic Sciences
|July 26, 2002
Summary
Forensic analysis of a bloodstain on suspect trousers revealed an identical DNA profile to the victim. A rare three-banded allele pattern at the D16S539 locus was confirmed using multiple STR typing kits.
Area of Science:
- Forensic Science
- Molecular Biology
- Genetics
Background:
- Forensic DNA analysis is crucial in criminal investigations.
- Short Tandem Repeat (STR) typing is a standard method for human identification.
- Investigating unusual genetic patterns can enhance forensic capabilities.
Observation:
- A bloodstain on suspect trousers in an attempted murder case was analyzed.
- STR typing for nine loci showed an identical genetic profile to the victim.
- A three-banded allele pattern was observed at the D16S539 locus in both the bloodstain and victim's reference sample.
Findings:
- The identical genetic profile was confirmed using Promega GenePrint STR silver stain kits.
- The three-banded allele pattern at D16S539 was further validated with PowerPlex 16 and AmpFlSTR SGM Plus kits via capillary electrophoresis.
- Analysis of nearby chromosome 16 loci (D16S3407, D16S2617, D16S3082) did not reveal the three-banded pattern.
Implications:
- This case highlights the importance of detailed STR profile analysis, including unusual patterns.
- The confirmed three-banded allele at D16S539 may represent a complex genetic phenomenon requiring further study.
- Such detailed analysis can strengthen forensic evidence and contribute to accurate case resolution.