Separation of sperm and vaginal cells with flow cytometry for DNA typing after sexual assault.

Abstract:

BACKGROUND:Successful DNA typing after rape is limited when only a few sperm and numerous vaginal cells are recovered from a swab, resulting in an extremely unfavorable ratio of male to female DNA. The goal of this study was to develop a protocol involving sperm cell sorting with flow cytometry based on differences in ploidy, major histocompatibility class I, CD45, and cytokeratin expression. METHOD:Vaginal lavages were mixed with serially diluted ejaculate. After immunostaining and stoichiometric nuclear staining, spermatocytes were isolated by fluorescence-activated cell sorting. All sorted cells were used for DNA extraction and subsequent quantitative fluorescent multiplex polymerase chain reaction. The preferential lysis was performed for comparison. EXPERIENCE:The sorting procedure was superior to the preferential lysis method within all tested conditions. In unfavorable dilutions, the male DNA could be identified only after cell sorting with flow cytometry. CONCLUSION:We were able to show that separation of sperm and vaginal cells using cell sorting with flow cytometry may be crucial when there are only microtraces of sperm detectable after rape.

journal_name

Obstet Gynecol

authors

Schoell WM,Klintschar M,Mirhashemi R,Pertl B

doi

10.1016/s0029-7844(99)00373-7

subject

Has Abstract

pub_date

1999-10-01 00:00:00

pages

623-7

issue

4

eissn

0029-7844

issn

1873-233X

pii

S0029-7844(99)00373-7

journal_volume

94

pub_type

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