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Cell Transfection Operation: Common Mistakes Avoided

🚨 Failure Case Library (13) + Submit your own case

Massive cell death after transfection — reagent toxicity is too high

Cells become rounded and detached after transfection; CCK-8 shows a sharp drop in viability vs. mock-transfected control.

💡 4 · ✓ 4

Very few cells are fluorescent — transfection efficiency is extremely low

Microscopy shows scattered positive cells; flow cytometry confirms positivity rate is very low (< 5 %).

💡 5 · ✓ 5

Very Low Transfection Efficiency

Transfection efficiency is significantly lower than expected with poor gene expression

💡 7 · ✓ 9

Cytotoxicity After Transfection

Reduced cell viability and cell death observed following transfection procedure

💡 7 · ✓ 7

Cell Death After RNAiMAX Transfection

Significant cell death observed following transfection with Lipofectamine RNAiMAX reagent

💡 2 · ✓ 2

Empty/negative control also shows fluorescence (high false-positive background)

Untransfected or empty-vector wells show a clearly green/red signal — you can't tell if the target plasmid is really expressing.

💡 4 · ✓ 4

mRNA Transfection Toxicity

Cell toxicity observed during mRNA transfection experiments with MessengerMAX reagent

💡 5 · ✓ 7

Very high replicate-well variation (poor reproducibility)

Parallel wells show very different fluorescence intensity / positive-cell rates; data fluctuates wildly between replicates.

💡 4 · ✓ 4

Lipid Reagent Accidentally Frozen

Transfection reagent was frozen instead of stored at 4°C, potentially affecting performance

💡 2 · ✓ 3

Transfections Not Reproducible

Transfection efficiency shows high variability between experiments and among replicates

💡 5 · ✓ 7

Abnormal fluorescence localization (aggregates / wrong compartment)

Fluorescence forms aggregates inside cells, or localizes to a compartment different from the expected native pattern.

💡 4 · ✓ 4

Granular Precipitate on Cells

Small granular precipitate visible microscopically on cells after adding transfection complexes

💡 3 · ✓ 4

Orange Background Fluorescence with GFP

Light granular orange background fluorescence observed after GFP transfection with Lipofectamine 2000

💡 3 · ✓ 3

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