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Section7:Transfection Cationic Matrix Reagents

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Superfect (Qiagen), Lipofection, Fugene 6 (Boehringer), Transfectam (Promega), TransFast (Promega), Tfx (Promega), CLONfectin (ClonTech), Lipofectamine Plus (GIBCO)

Once the optimal transient transfection method and cationic matrix reagent have been selected then additional factors can be considered in developing a method for optimizing a transient transfection protocol.

Day

Protocol

Variables

1

Seed cells

Cell number is dependent on cell type
Type of culture flask
Optimal range is 50% density on day 2 (40-60%)

2

Transfect cells

Protocol of transfection is dependent on reagents used (see list above on transfection reagents)
Variables to be tested: DNA amount, Reagent amount, DNA: Reagent ratio, serum concentration, medium type, time of transfection. These variables are optimized according to cell type.

3,4 or 5

Determine transfection efficiency, end product or reporter expression
Induction or stimulation

Depending on the cell type the assay for gene expression is usually measured between 24 to 72 hours after transfection. Induction or stimulation is usually done 48 hours after transfection, and then determine expression levels. Method for determining expression will also depend on type of expression- GFP can be monitored by visual inspection; luciferase is measured by cell lysis, addition of substrate and measurement of light output.