Oral microbiome dynamics in Postmortem Interval estimation: research standards and guidelines

Determination of the postmortem interval (PMI) is a crucial aspect of forensic investigations as it verifies an alibi or narrows down suspects. Nevertheless, PMI estimation remains one of the most challenging problems in forensic science. Currently used methods are influenced by various biotic and abiotic factors affecting decomposition. Thus, determining the time of death largely depends on the skills and experience of the forensic experts. Consequently, currently used procedures are prone to inaccuracies. Lately, gut microbiome analysis has proven useful in determining the time of death. Furthermore, emerging evidence indicates that profiling the oral microbiome may also provide valuable insights into PMI estimation. In this review, we examine published reports on oral microbiome and highlight the methodological limitations that diminish their scientific value. Therefore, we summarize the research standards and guidelines for oral microbiome studies to enhance the accuracy and reproducibility of PMI studies. Consequently, standardization of this type of research could lead to the development of innovative approaches that may be implemented into routine forensic genetics practice.