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Cell Transfection Principles and Complete Protocol

🚨 Failure Case Library (10) + Submit your own case

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

Cytotoxicity After Transfection

Reduced cell viability and cell death observed following transfection procedure

💡 7 · ✓ 7

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

Bright fluorescence but Western blot shows very low expression

GFP fluorescence is obvious under microscope, but the corresponding band on Western blot is faint or near-invisible.

💡 5 · ✓ 5

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

Co-transfection ratio imbalance — uneven dual-plasmid expression

Of two co-transfected plasmids, only one expresses strongly; the fraction of double-positive cells is low.

💡 5 · ✓ 4

Bright at 24 h but signal rapidly decays at 48 – 72 h

Early time point shows strong fluorescence but it drops sharply within 48 – 72 h; signal varies dramatically between time points.

💡 4 · ✓ 4

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

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