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Good shedder or bad shedder—the influence of skin diseases on forensic DNA analysis from epithelial abrasions

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Abstract

The successful analysis of weak biological stains by means of highly sensitive short tandem repeat (STR) amplification has been increased significantly over the recent years. Nevertheless, the percentage of reliably analysable samples varies considerably between different crime scene investigations even if the nature of the stains appears to be the same. It has been proposed that the amount and quality of DNA left at a crime scene may be due to individual skin conditions (among other factors). Therefore, we investigated DNA from handprints from 30 patients acutely suffering from skin diseases like atopic dermatitis, psoriasis or skin ulcer before and after therapy by STR amplification using the new and highly sensitive Powerplex® ESX17 kit in comparison to 22 healthy controls. Handprints from atopic dermatitis patients showed a correct and reliable DNA profile in 90% and 40% of patients before and after therapy, respectively. Regarding psoriasis patients, we detected full DNA profiles in only 64% and 55% of handprints before and after therapy. In contrast, in ulcus patients and controls, full DNA profiles were obtained in much lower numbers. We conclude that active skin diseases like atopic dermatitis or psoriasis have a considerable impact on the amplificable DNA left by skin contact with surfaces. Since up to 7% of adults in European countries suffer from one of these diseases, this could explain at least partially the varying quality of DNA from weak stains.

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Authors and Affiliations

  1. Institute of Legal Medicine, University Hospital Essen, Hufelandstr. 55, 45122, Essen, Germany

    Thomas Kamphausen, Thomas Bajanowski & Micaela Poetsch

  2. Department of Dermatology, University Hospital Essen, Essen, Germany

    Dirk Schadendorf

  3. Institute of Legal Medicine, University of Schleswig-Holstein, Campus Kiel, Kiel, Germany

    Nicole von Wurmb-Schwark

Authors
  1. Thomas Kamphausen
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  2. Dirk Schadendorf
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  3. Nicole von Wurmb-Schwark
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  4. Thomas Bajanowski
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  5. Micaela Poetsch
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Correspondence to Micaela Poetsch.

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Kamphausen, T., Schadendorf, D., von Wurmb-Schwark, N. et al. Good shedder or bad shedder—the influence of skin diseases on forensic DNA analysis from epithelial abrasions. Int J Legal Med 126, 179–183 (2012). https://doi.org/10.1007/s00414-011-0579-0

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  • DOI: https://doi.org/10.1007/s00414-011-0579-0

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