Zusammenfassung
Die geringste morphologisch abgrenzbare Einheit einer biologischen Spur ist eine einzelne Zelle. Dabei handelt es sich überwiegend um Epithelzellen durch Hautabschilferungen oder aus Sekreten. Mithilfe eines Mikromanipulators, wie er für die intrazytoplasmatische Spermieninjektion (ICSI) verwendet wird, und selbst hergestellten Pipetten wurden aus Ausstrichen Einzelzellen isoliert bzw. aufgenommen und anschließend die beiden hypervariablen Regionen (HV1 und HV2) der mitochondrialen (mt)DNA amplifiziert und sequenziert. Insgesamt wurden 175 einzelne Epithelzellen von 6 verschiedenen Probanden untersucht. Aus 57 Einzelzellen wurde eine „single polymerase chain reaction“ (Single-PCR) der HV1-Region durchgeführt und in 77% der PCR ein Amplifikat nachgewiesen. Aus 22 Einzelzellen gelang dies für die HV2-Region, mit Nachweis des Amplifikats in 90% der PCR. An weiteren 96 Einzelzellen wurde eine gemeinsame Amplifikation von HV1- und HV2-Region in einem PCR-Ansatz vorgenommen; der Amplifikatnachweis lag bei 80% der PCR. Während aller Versuche waren keine Kontaminationen zu verzeichnen, d. h. die untersuchten Proben ergaben keine andere Sequenz als die erwartete und zeigten keine Mischspur. Die vorgestellte Methode kann in Fällen, in denen die „Short-tandem-repeat“- (STR-)Typisierung und konventionelle Sequenzierung der mtDNA nicht oder nur eingeschränkt möglich ist, Anwendung finden. Dies gilt insbesondere für Mischspuren und Untersuchungen zur Abschätzung von Heteroplasmien in der mtDNA.
Abstract
The smallest morphologically defined unit of biological trace evidence is a single cell. In most cases these are exfoliated epithelial cells or cells from secretions. With the aid of a micromanipulator, such as is used for intracytoplasmic sperm injections (ICSI) and self-made pipettes single cells were isolated, or lifted from smear preparations and both hypervariable regions (HV1 and HV2) of mitochondrial DNA (mtDNA) were subsequently amplified and sequenced. In total 175 single epithelial cells from 6 different subjects were examined. Single PCR for the HV1 region was performed for 57 of the single cells and PCR products could be demonstrated in 77% of cases. This procedure was also performed for the HV2 region from 22 single cells with PCR products being demonstrated in 90% of cases. For a further 96 single cells combined amplification of the HV1 and HV2 regions was performed in one PCR reaction and PCR products could be demonstrated in 80% of cases. During all experimental settings no contamination occurred meaning that none of the samples examined yielded any other sequence than the expected one and did not show a mixture of samples. The presented method can be applied to cases in which STR typing and conventional sequencing of mtDNA is limited or impossible. This particularly applies to mixed stains and examinations assessing heteroplasmy in mtDNA.
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Brück, S., Thias, V., Heidorn, F. et al. Sequenzierung aus einzelnen Epithelzellen. Rechtsmedizin 20, 25–33 (2010). https://doi.org/10.1007/s00194-009-0649-5
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DOI: https://doi.org/10.1007/s00194-009-0649-5