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Transfection moderate

Very high replicate-well variation (poor reproducibility)

Symptom
Parallel wells show very different fluorescence intensity / positive-cell rates; data fluctuates wildly between replicates.
Common Causes
  1. 1 Uneven seeding — cell density differs between wells
  2. 2 Transfection mix not pipetted uniformly
  3. 3 Edge-well evaporation
  4. 4 Different observation time points across wells
Solutions
  1. 1 Pre-mix cell suspension well, seed all wells from the same master suspension
  2. 2 Prepare ONE master mix of DNA + reagent and dispense from it
  3. 3 Avoid edge wells; fill outer rows with PBS to reduce evaporation
  4. 4 Image all wells at the exact same time post-transfection
Related Video (4)
JoVE (Open Access)
MISSION esiRNA for RNAi Screening in Mammalian Cells
Bilibili (China-Accessible Mirrors) ★ 82
Cell Transfection Operation: Common Mistakes Avoided
"Explicitly addresses common mistakes and troubleshooting in transfection protocols, directly applicable to diagnosing reproducibility issues from uneven seeding"
Bilibili (China-Accessible Mirrors) ★ 76
Cell Transfection Principles and Complete Protocol
"Combines protocol principles with optimization tips, enabling identification of procedural steps where uneven cell seeding creates variation between replicates"
Bilibili (China-Accessible Mirrors) ★ 71
Cell Transfection: Definition and Operational Procedures
"Comprehensive hands-on protocol with operational focus will clarify proper cell seeding and preparation techniques critical to preventing well-to-well variation"
Source: xiaohongshu.com ↗
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