Campos EA, Pitta DR, Costa FA, Campos VM, Yela D, Fernandes A. DNA extraction from filter-paper spots of vaginal samples collected after sexual violence.
Int J Gynaecol Obstet 2014;
126:23-7. [PMID:
24792405 DOI:
10.1016/j.ijgo.2014.02.010]
[Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2013] [Revised: 02/03/2014] [Accepted: 03/27/2014] [Indexed: 11/18/2022]
Abstract
OBJECTIVE
To detect the presence of male DNA in vaginal samples collected from survivors of sexual violence and stored on filter paper.
METHODS
A pilot study was conducted to evaluate 10 vaginal samples spotted on sterile filter paper: 6 collected at random in April 2009 and 4 in October 2010. Time between sexual assault and sample collection was 4-48hours. After drying at room temperature, the samples were placed in a sterile envelope and stored for 2-3years until processing. DNA extraction was confirmed by polymerase chain reaction for human β-globin, and the presence of prostate-specific antigen (PSA) was quantified. The presence of the Y chromosome was detected using primers for sequences in the TSPY (Y7/Y8 and DYS14) and SRY genes.
RESULTS
β-Globin was detected in all 10 samples, while 2 samples were positive for PSA. Half of the samples amplified the Y7/Y8 and DYS14 sequences of the TSPY gene and 30% amplified the SRY gene sequence of the Y chromosome. Four male samples and 1 female sample served as controls.
CONCLUSION
Filter-paper spots stored for periods of up to 3years proved adequate for preserving genetic material from vaginal samples collected following sexual violence.
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