An Australian study reveals that a person's unique bacterial signature can be identified on their sexual partner after intercourse, even with condom use. This discovery holds potential for forensic analysis in sexual assault cases where traditional DNA evidence is absent.
A groundbreaking Australian study suggests that the unique bacterial signature of an individual can be detected on their sexual partner after intercourse, even when barrier protection is used. This finding opens up exciting possibilities for forensic testing, particularly in sexual assault cases where traditional DNA evidence, such as sperm, is absent. The research, led by Dr. Brendan Chapman of Murdoch University, focused on the 'sexome' – the collection of bacteria that inhabit the genitals.
These bacteria vary significantly between individuals and are transferred during sexual contact, leaving a distinct imprint on their partner. The team analyzed a bacterial gene called 16S rRNA, which is not found in humans, allowing them to identify individual bacterial profiles. Swabs taken from 12 monogamous heterosexual couples before and after intercourse revealed that the bacterial signature of one partner could be detected on the other, even when condoms were used. However, the transfer was more prominent from female to male partners in these cases.While condoms did reduce bacterial transfer, the study highlighted that other factors, such as timing of condom use and male hygiene after intercourse, could influence the detectability of these signatures. The researchers believe this technique could significantly expand the window for testing after a sexual assault, going beyond the 24-hour timeframe typically associated with traditional DNA analysis. Dr. Chapman emphasized, however, that further research is needed to refine the uniqueness and reliability of bacterial signatures for courtroom use. The team also aims to explore the sexome in the absence of intercourse and its variations throughout the female menstrual cycle. Professor Dennis McNevin, a forensic genetics expert at the University of Technology Sydney, who was not involved in the study, acknowledged the potential of bacterial genetic profiling as a supplementary tool in sexual assault investigations. He stressed that DNA analysis would remain the primary method of evidence gathering, but bacterial tracing could provide valuable corroboration or challenge witness testimony in cases where other DNA evidence is scarce or inconclusive
Law & Crime Sexual Assault Forensic Science Bacterial Signature Sexome DNA Evidence
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