Summary
Dental pulp tissue could be obtained in most cases from materials obtained under experimental conditions and from forensic casework (air accidents, burned and putrefied bodies). Teeth extracted during dental treatment (n = 30) were stored for 6 weeks and 4 years at room temperature. In addition teeth (n = 10) extracted from jaw fragments that had been stored for 15 years at room temperature, and teeth extracted post mortem from actual identification cases (n = 8) were investigated. Following extraction from dental pulp tissue the DNA concentration was measured by fluorometry. The amount of DNA obtained from the dental pulp tissue of a single tooth varied from 6 μg to 50 μg DNA. In most cases high molecular weight DNA was still present although the major portion consisted of degraded DNA. Genomic dot blot hybridization for sex determination using the biotinylated repetitive DNA probe pHY 2.1 was performed and sex was correctly classified in all cases using 50–100 ng target DNA. PCR typing of the HLA-DQα and ApoB 3′ VNTR systems from dental pulp tissue DNA was in agreement with the results obtained from blood, bloodstains, or lung tissue. In addition, Southern blot analysis of selected samples using the single locus VNTR probe pYNH24 was successfully performed. In all cases the DNA recovered from dental pulp was unsuitable for multilocus probe analysis.
Zusammenfassung
Zur Untersuchung gelangten anläßlich einer Zahnbehandlung extrahierte Zähne nach einer Liegezeit bei Raumtemperatur von 6 Wochen (n = 20) bis zu 4 Jahren (n = 10) sowie postmortem extrahierte Zähne von aktuellen Identifikationsfällen (n = 8) und einem Flugzeugabsturz des Jahres 1976 (n = 10). Die Zahnpulpa wurde präpariert und eine DNA Extraktion vorgenommen. Die Ausbeute betrug 6 μg bis 50 μg DNA pro Zahn. In den meisten Fällen war neben degradierter DNA noch hochmolekulare DNA vorhanden. Die Geschlechtsbestimmung erfolgte durch Dot-Hybridisierung mit der biotinylierten repetitiven DNA-Sonde pHY 2.1. In allen Fällen konnte das Geschlecht mit 50–100 ng Ziel-DNA zutreffend bestimmt werden. An genetischen Markern nach DNA-Amplifikation durch PCR erfolgte eine Typisierung der HLA-DQα und ApoB 3′ VNTR Merkmale. Die Resultate zeigten Übereinstimmung mit den Genotypen, die an Blut, Blutspuren oder Lungengewebe ermittelt wurden. Southern Blot-Analysen mit Minisatelliten-DNA-Sonden ergaben auswertbare Resultate mit der Einzellocus-Sonde pYNH24, während eine Multilocus-Sonden-Hybridisierung der aus den Zahnpulpen isolierten DNA nicht gelang.
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Abbreviations
- BCIP:
-
5-bromo-4-chloro-3-indolylphosphate
- RFLP:
-
Restriction fragment length polymorphism
- VNTR:
-
Variable number of tandem repeats
- AMP-FLP:
-
Amplified fragment length polymorphism
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Pötsch, L., Meyer, U., Rothschild, S. et al. Application of DNA techniques for identification using human dental pulp as a source of DNA. Int J Leg Med 105, 139–143 (1992). https://doi.org/10.1007/BF01625165
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DOI: https://doi.org/10.1007/BF01625165
Key words
- Identification
- Forensic odontology
- Dental pulp
- Sex determination
- DNA
- PCR
- HLA-DQα typing
- Apo B 3′ polymorphism
- VNTR analysis