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Significance of autosomal STR Markers Kits to determine sexual assault case involving brother in law

Author Affiliations

  • 1Scientific officer, DNA Finger printing Unit, State Forensic Science Laboratory, Sagar, MP, India

Res. J. Forensic Sci., Volume 11, Issue (2), Pages 7-14, July,29 (2023)

Abstract

Sexual harassment of women and children is an unforgivable crime that results from the distorted mentality of wrong men. A crime of this nature becomes very tragic and complicated when a close relative or family member of the victim is involved in such a crime. In many cases the event is hidden under family pressure due to fear of desecration. Once such a crime is reported, it is necessary to detect the incident by scientific method. DNA fingerprinting plays an important role in detecting a criminal's involvement in a crime. Currently the Y STR marker kit is available which provides information about the presence of male material on exhibits received from the complainant. But in some circumstances in which the woman is raped by her husband's spouse, the Y STR marker kit is not sufficient for the conclusive outcome. The present study is based on a similar incident in which a married woman was raped by her brother-in-law. The presence of male DNA was confirmed by Y STR markers when DNA fingerprinting of the exhibits from the source of the victim was done. A complete Y STR profile was obtained from the victim's source, corresponding to the accused's Y STR profile. But this profile was also similar to the victim's husband's Y STR DNA profile. In this case, the results obtained using the autosomal STR marker kit were clearly stating that the male DNA profile obtained from the victim's source was of the accused rather than the victim's husband. The current case study suggests that the main advantage of using the Y-STR approach is the ability to detect male DNA at the source of the victim, but when the woman is married and her husband's paternal relatives are involved in incidents share same Y Lineages, so only such autosomal STR markers can resolve such cases.

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