The Optimization of Pressure Cycling Technology (PCT) for Differential Extraction of Sexual Assault Casework

Authors

Vanessa MartinezFollow

Document Type

Thesis

Degree

Master of Science (MS)

Major/Program

Chemistry

First Advisor's Name

Bruce McCord

First Advisor's Committee Title

Committee Chair

Second Advisor's Name

Martin Tracey

Second Advisor's Committee Title

Committee Member

Third Advisor's Name

Francisco Fernandez-Lima

Third Advisor's Committee Title

Committee Member

Keywords

Forensics, Differential Extraction, Pressure Cycling, Nucleic Acid Isolation Methods, Alkaline Lysis, Epithelial Cells, Spermatozoa

Date of Defense

11-4-2016

Abstract

A two-step protocol has been devised as a rapid and selective alternative to conventional differential extraction techniques with an increased recovery of DNA. The protocol involves pressure cycling with the Barocycler^® NEP 2320 from Pressure Biosciences. Inc. in alkaline conditions for epithelial cell lysis and removal. This step is followed by alkaline lysis at 95^º C for extraction of sperm cell DNA. At 1:1 or 2:1 female to male cell ratios, high selectivity and complete separation can be achieved. But at higher ratios, male allelic dropout is observed. This protocol has been modified to generate a clean male profile at a 20:1 cell ratio through optimization of NaOH concentration and inclusion of an additional pressure cycling step. Validation studies have been performed to assess the efficiency of this method under various conditions. An additional immunomagnetic cell capture pretreatment allowed for nearly complete separation at cell ratios of up to 200:1.

Identifier

FIDC001223

Recommended Citation

Martinez, Vanessa, "The Optimization of Pressure Cycling Technology (PCT) for Differential Extraction of Sexual Assault Casework" (2016). FIU Electronic Theses and Dissertations. 2999.
https://digitalcommons.fiu.edu/etd/2999