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International Journal of Legal Medicine

, Volume 123, Issue 5, pp 427–430 | Cite as

One person with two DNA profiles: a(nother) case of mosaicism or chimerism

  • Vincent CastellaEmail author
  • Maria del Mar Lesta
  • Patrice Mangin
Case Report

Abstract

Nuclear DNA markers, such as short tandem repeats (STR), are widely used for crime investigation and paternity testing. STR were used to determine whether a piece of tissue regurgitated by a dog was part of the penis of a dead, emasculated, man. Unexpectedly, when analyzing the recovered material and a blood sample from the deceased, five out of the 18 loci differed. According to the results, one could have concluded that these samples originated from two different persons. However, taking into account contextual information and data from complementary genetic analyses, the most likely hypothesis was that the deceased was a genetic mosaic or a chimera. Within a forensic genetic context, such genetic peculiarities may prevent associating the perpetrator of an offense with a stain left at a crime scene or lead to false paternity exclusions. Fast recognition of mosaics or chimeras, adapted sampling scheme, as well as careful interpretation of the data should allow avoiding such pitfalls.

Keywords

Short tandem repeat (STR) Evidence evaluation Mosaicism Chimerism Likelihood ratio approach 

Notes

Acknowledgments

The authors wish to thank the staff of the laboratory for their work as well as T. Hicks and reviewers for their comments on earlier versions of the manuscript.

Supplementary material

414_2009_331_MOESM1_ESM.pdf (86 kb)
ESM 1 Differences at five of 18 STR loci (PowerPlex 16 and AmpFlSTR SEfiler PCR amplification kits) were observed when analyzing different samples from the same dead man. For instance, his blood DNA profile (lower part of the Figure) was characterized by loss of heterozygosity at loci D3S1358, D5S818, and CSF1PO and allele change at loci SE33 (or ACTBP2) and FGA when compared to his buccal swab DNA profile (upper part of the figure). Such genetic particularities that may occur in genetic mosaics and chimeras may severely interfere with forensic genetic applications (PDF 86 kb)

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Copyright information

© Springer-Verlag 2009

Authors and Affiliations

  • Vincent Castella
    • 1
    Email author
  • Maria del Mar Lesta
    • 2
  • Patrice Mangin
    • 1
    • 2
  1. 1.Unité de Génétique ForensiqueCentre Universitaire Romand de Médecine LégaleLausanneSwitzerland
  2. 2.Unité de Médecine ForensiqueCentre Universitaire Romand de Médecine LégaleLausanneSwitzerland

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