Aug 08, 2023
iNDI PiggyBac-TO-hNGN2 transfection protocol Version 1
- 1National Institutes of Health, NIH Center for Alzheimer's and Related Dementias (CARD)
External link: https://www.jax.org/jax-mice-and-services/ipsc
Protocol Citation: Mark Cookson, michael.ward, Erika Lara Flores 2023. iNDI PiggyBac-TO-hNGN2 transfection protocol Version 1. protocols.io https://dx.doi.org/10.17504/protocols.io.rm7vzxb22gx1/v1
License: This is an open access protocol distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited
Protocol status: Working
We use this protocol and it's working
Created: August 08, 2023
Last Modified: August 08, 2023
Protocol Integer ID: 86174
Keywords: iNeurons, NGN2, Piggybac, transfection, iNDI, Jackson Laboratory, CARD, NIH
Abstract
PiggyBac Method for hNGN2 transfection
- Transfection protocol
- Use of CEPT: Nature Methods 18, 528-541, 2021
Materials
Reagents
Opti-MEM™ I Reduced Serum MediumGibco - Thermo FischerCatalog #31985062
Lipofectamine™ Stem Transfection ReagentThermo Fisher ScientificCatalog #STEM00008
StemPro™ Accutase™ Cell Dissociation ReagentGibco - Thermo FisherCatalog #A1110501
PBS 1xLonzaCatalog #BE17-516F
• Chroman I MedChemExpressCatalog #HY-15392
Emricasan (IDN-6556)SelleckchemCatalog #S7775
Polyamine Supplement (1000×)Sigma AldrichCatalog #P8483
Trans-ISRIBTocrisCatalog #5284
Essential 8™ MediumGibco, ThermoFisherCatalog #A1517001
Matrigel hESC-Qualified Matrix, LDEV-freeCorningCatalog #354277
Plasmids
PB-TO-hNGN2 (Addgene #172115)
EF1a-Transposase (sequence):
GACGGATCGGGAGATCTCCCGATCCCCTATGGTGCACTCTCAGTACAATCTGCTCTGATGCCGCATAGTTAAGCCAGTATCTGCTCCCTGCTTGTGTGTTGGAGGTCGCTGAGTAGTGCGCGAGCAAAATTTAAGCTACAACAAGGCAAGGCTTGACCGACAATTGCATGAAGAATCTGCTTAGGGTTAGGCGTTTTGCGCTGCTTCGCGATGTACGGGCCAGATATACGCGTGTGCCCGTCAGTGGGCAGAGCGCACATCGCCCACAGTCCCCGAGAAGTTGGGGGGAGGGGTCGGCAATTGAACCGGTGCCTAGAGAAGGTGGCGCGGGGTAAACTGGGAAAGTGATGTCGTGTACTGGCTCCGCCTTTTTCCCGAGGGTGGGGGAGAACCGTATATAAGTGCAGTAGTCGCCGTGAACGTTCTTTTTCGCAACGGGTTTGCCGCCAGAACACAGGTAAGTGCCGTGTGTGGTTCCCGCGGGCCTGGCCTCTTTACGGGTTATGGCCCTTGCGTGCCTTGAATTACTTCCACCTGGCTGCAGTACGTGATTCTTGATCCCGAGCTTCGGGTTGGAAGTGGGTGGGAGAGTTCGAGGCCTTGCGCTTAAGGAGCCCCTTCGCCTCGTGCTTGAGTTGAGGCCTGGCCTGGGCGCTGGGGCCGCCGCGTGCGAATCTGGTGGCACCTTCGCGCCTGTCTCGCTGCTTTCGATAAGTCTCTAGCCATTTAAAATTTTTGATGACCTGCTGCGACGCTTTTTTTCTGGCAAGATAGTCTTGTAAATGCGGGCCAAGATCTGCACACTGGTATTTCGGTTTTTGGGGCCGCGGGCGGCGACGGGGCCCGTGCGTCCCAGCGCACATGTTCGGCGAGGCGGGGCCTGCGAGCGCGGCCACCGAGAATCGGACGGGGGTAGTCTCAAGCTGGCCGGCCTGCTCTGGTGCCTGGCCTCGCGCCGCCGTGTATCGCCCCGCCCTGGGCGGCAAGGCTGGCCCGGTCGGCACCAGTTGCGTGAGCGGAAAGATGGCCGCTTCCCGGCCCTGCTGCAGGGAGCTCAAAATGGAGGACGCGGCGCTCGGGAGAGCGGGCGGGTGAGTCACCCACACAAAGGAAAAGGGCCTTTCCGTCCTCAGCCGTCGCTTCATGTGACTCCACGGAGTACCGGGCGCCGTCCAGGCACCTCGATTAGTTCTCGcGCTTTTGGAGTACGTCGTCTTTAGGTTGGGGGGAGGGGTTTTATGCGATGGAGTTTCCCCACACTGAGTGGGTGGAGACTGAAGTTAGGCCAGCTTGGCACTTGATGTAATTCTCCTTGGAATTTGCCCTTTTTGAGTTTGGATCTTGGTTCATTgccacCATGGGCTCTAGCCTGGACgacgagcacatcctgagcgccctgctgcagagcgacgacgaactggtgggcgaggacagcgacagcgaggtcagcgaccacgtgtccgaggacgacgtgcagtccgacaccgaggaagccttcatcgacgaggtgcacgaagtgcagcctaccagcagcggctccgagatcctggacgagcagaacgtgatcgagcagcctggcagctccctggccagcaacagaatcctgaccctgccccagagaaccatcagaggcaagaacaagcactgctggtccacctccaagagcaccaggcggagcagagtgtccgccctgaacatcgtgcggagccagaggggccccaccagaatgtgcagaaacatctacgaccccctgctgtgcttcaagctgttcttcaccgacgagatcatcagcgagatcgtgaagtggaccaacgccgagatcagcctgaagaggcgggagagcatgaccagcgccaccttcagagacaccaacgaggacgagatctacgccttcttcggcatcctggtgatgaccgccgtgagaaaggacaaccacatgagcaccgacgacctgttcgacagatccctgagcatggtgtacgtgtccgtgatgagcagagacagattcgacttcctgatcagatgcctgagaatggacgacaagagcatcagacccaccctgcgggagaacgacgtgttcacccccgtgcggaagatctgggacctgttcatccaccagtgcatccagaactacacccctggcgcccacctgaccatcgatgagcagctgctgggcttcagaggcagatgccccttcagagtgtacatccccaacaagcccagcaagtacggcatcaagatcctgatgatgtgcgacagcggcaccaagtacatgatcaacggcatgccctacctgggcagaggcacccagacaaacggcgtgcccctgggcgagtactacgtgaaagaactgagcaagcctgtgcatggcagctgcaggaacatcacctgcgacaactggttcaccagcatccccctggccaagaacctgctgcaggaaccctacaagctgaccatcgtgggcaccgtgcggagcaacaagcgggagatcccagaggtgctgaagaacagcagatccagacctgtgggaacaagcatgttctgcttcgacggccccctgaccctggtgtcctacaagcccaagcccgccaagatggtgtacctgctgtccagctgcgacgaggacgccagcatcaacgagagcaccggcaagccccagatggtgatgtactacaaccagaccaagggcggcgtggacaccctggaccagatgtgcagcgtgatgacctgcagcagaaagaccaacagatggcccatggccctgctgtacggcatgatcaatatcgcctgcatcaacagcttcatcatctacagccacaacgtgtccagcaagggcgagaaggtgcagagccggaagaaattcatgcggaacctgtacatgagcctgacctccagcttcatgagaaagagactggaagcccccaccctgaagagatAcctgCgggacaacatcagcaacatcctGcccaaggaagtgccaggaacaagcgacgacagcaccgaggaacccgtgatgaagaagaggacctactgcacctactgtcccagcaagatcagaagaaaggccaacgccagctgcaagaaatgcaaaaaagtgatctgccgggagcacaacatcgacatGTGCCAGAGCTGTTTCTGATCTAGAGGGCCCGTTTAAACCCGCTGATCAGCCTCGACTGTGCCTTCTAGTTGCCAGCCATCTGTTGTTTGCCCCTCCCCCGTGCCTTCCTTGACCCTGGAAGGTGCCACTCCCACTGTCCTTTCCTAATAAAATGAGGAAATTGCATCGCATTGTCTGAGTAGGTGTCATTCTATTCTGGGGGGTGGGGTGGGGCAGGACAGCAAGGGGGAGGATTGGGAAGACAATAGCAGGCATGCTGGGGATGCGGTGGGCTCTATGGCTTCTGAGGCGGAAAGAACCAGCTGGGGCTCTAGGGGGTATCCCCACGCGCCCTGTAGCGGCGCATTAAGCGCGGCGGGTGTGGTGGTTACGCGCAGCGTGACCGCTACACTTGCCAGCGCCCTAGCGCCCGCTCCTTTCGCTTTCTTCCCTTCCTTTCTCGCCACGTTCGCCGGCTTTCCCCGTCAAGCTCTAAATCGGGGGCTCCCTTTAGGGTTCCGATTTAGTGCTTTACGGCACCTCGACCCCAAAAAACTTGATTAGGGTGATGGTTCACGTAGTGGGCCATCGCCCTGATAGACGGTTTTTCGCCCTTTGACGTTGGAGTCCACGTTCTTTAATAGTGGACTCTTGTTCCAAACTGGAACAACACTCAACCCTATCTCGGTCTATTCTTTTGATTTATAAGGGATTTTGCCGATTTCGGCCTATTGGTTAAAAAATGAGCTGATTTAACAAAAATTTAACGCGAATTAATTCTGTGGAATGTGTGTCAGTTAGGGTGTGGAAAGTCCCCAGGCTCCCCAGCAGGCAGAAGTATGCAAAGCATGCATCTCAATTAGTCAGCAACCAGGTGTGGAAAGTCCCCAGGCTCCCCAGCAGGCAGAAGTATGCAAAGCATGCATCTCAATTAGTCAGCAACCATAGTCCCGCCCCTAACTCCGCCCATCCCGCCCCTAACTCCGCCCAGTTCCGCCCATTCTCCGCCCCATGGCTGACTAATTTTTTTTATTTATGCAGAGGCCGAGGCCGCCTCTGCCTCTGAGCTATTCCAGAAGTAGTGAGGAGGCTTTTTTGGAGGCCTAGGCTTTTGCAAAAAGCTCCCGGGAGCTTGTATATCCATTTTCGGATCTGATCAAGAGACAGGATGAGGATCGTTTCGCATGATTGAACAAGATGGATTGCACGCAGGTTCTCCGGCCGCTTGGGTGGAGAGGCTATTCGGCTATGACTGGGCACAACAGACAATCGGCTGCTCTGATGCCGCCGTGTTCCGGCTGTCAGCGCAGGGGCGCCCGGTTCTTTTTGTCAAGACCGACCTGTCCGGTGCCCTGAATGAACTGCAGGACGAGGCAGCGCGGCTATCGTGGCTGGCCACGACGGGCGTTCCTTGCGCAGCTGTGCTCGACGTTGTCACTGAAGCGGGAAGGGACTGGCTGCTATTGGGCGAAGTGCCGGGGCAGGATCTCCTGTCATCTCACCTTGCTCCTGCCGAGAAAGTATCCATCATGGCTGATGCAATGCGGCGGCTGCATACGCTTGATCCGGCTACCTGCCCATTCGACCACCAAGCGAAACATCGCATCGAGCGAGCACGTACTCGGATGGAAGCCGGTCTTGTCGATCAGGATGATCTGGACGAAGAGCATCAGGGGCTCGCGCCAGCCGAACTGTTCGCCAGGCTCAAGGCGCGCATGCCCGACGGCGAGGATCTCGTCGTGACCCATGGCGATGCCTGCTTGCCGAATATCATGGTGGAAAATGGCCGCTTTTCTGGATTCATCGACTGTGGCCGGCTGGGTGTGGCGGACCGCTATCAGGACATAGCGTTGGCTACCCGTGATATTGCTGAAGAGCTTGGCGGCGAATGGGCTGACCGCTTCCTCGTGCTTTACGGTATCGCCGCTCCCGATTCGCAGCGCATCGCCTTCTATCGCCTTCTTGACGAGTTCTTCTGAGCGGGACTCTGGGGTTCGAAATGACCGACCAAGCGACGCCCAACCTGCCATCACGAGATTTCGATTCCACCGCCGCCTTCTATGAAAGGTTGGGCTTCGGAATCGTTTTCCGGGACGCCGGCTGGATGATCCTCCAGCGCGGGGATCTCATGCTGGAGTTCTTCGCCCACCCCAACTTGTTTATTGCAGCTTATAATGGTTACAAATAAAGCAATAGCATCACAAATTTCACAAATAAAGCATTTTTTTCACTGCATTCTAGTTGTGGTTTGTCCAAACTCATCAATGTATCTTATCATGTCTGTATACCGTCGACCTCTAGCTAGAGCTTGGCGTAATCATGGTCATAGCTGTTTCCTGTGTGAAATTGTTATCCGCTCACAATTCCACACAACATACGAGCCGGAAGCATAAAGTGTAAAGCCTGGGGTGCCTAATGAGTGAGCTAACTCACATTAATTGCGTTGCGCTCACTGCCCGCTTTCCAGTCGGGAAACCTGTCGTGCCAGCTGCATTAATGAATCGGCCAACGCGCGGGGAGAGGCGGTTTGCGTATTGGGCGCTCTTCCGCTTCCTCGCTCACTGACTCGCTGCGCTCGGTCGTTCGGCTGCGGCGAGCGGTATCAGCTCACTCAAAGGCGGTAATACGGTTATCCACAGAATCAGGGGATAACGCAGGAAAGAACATGTGAGCAAAAGGCCAGCAAAAGGCCAGGAACCGTAAAAAGGCCGCGTTGCTGGCGTTTTTCCATAGGCTCCGCCCCCCTGACGAGCATCACAAAAATCGACGCTCAAGTCAGAGGTGGCGAAACCCGACAGGACTATAAAGATACCAGGCGTTTCCCCCTGGAAGCTCCCTCGTGCGCTCTCCTGTTCCGACCCTGCCGCTTACCGGATACCTGTCCGCCTTTCTCCCTTCGGGAAGCGTGGCGCTTTCTCATAGCTCACGCTGTAGGTATCTCAGTTCGGTGTAGGTCGTTCGCTCCAAGCTGGGCTGTGTGCACGAACCCCCCGTTCAGCCCGACCGCTGCGCCTTATCCGGTAACTATCGTCTTGAGTCCAACCCGGTAAGACACGACTTATCGCCACTGGCAGCAGCCACTGGTAACAGGATTAGCAGAGCGAGGTATGTAGGCGGTGCTACAGAGTTCTTGAAGTGGTGGCCTAACTACGGCTACACTAGAAGAACAGTATTTGGTATCTGCGCTCTGCTGAAGCCAGTTACCTTCGGAAAAAGAGTTGGTAGCTCTTGATCCGGCAAACAAACCACCGCTGGTAGCGGTTTTTTTGTTTGCAAGCAGCAGATTACGCGCAGAAAAAAAGGATCTCAAGAAGATCCTTTGATCTTTTCTACGGGGTCTGACGCTCAGTGGAACGAAAACTCACGTTAAGGGATTTTGGTCATGAGATTATCAAAAAGGATCTTCACCTAGATCCTTTTAAATTAAAAATGAAGTTTTAAATCAATCTAAAGTATATATGAGTAAACTTGGTCTGACAGTTACCAATGCTTAATCAGTGAGGCACCTATCTCAGCGATCTGTCTATTTCGTTCATCCATAGTTGCCTGACTCCCCGTCGTGTAGATAACTACGATACGGGAGGGCTTACCATCTGGCCCCAGTGCTGCAATGATACCGCGAGACCCACGCTCACCGGCTCCAGATTTATCAGCAATAAACCAGCCAGCCGGAAGGGCCGAGCGCAGAAGTGGTCCTGCAACTTTATCCGCCTCCATCCAGTCTATTAATTGTTGCCGGGAAGCTAGAGTAAGTAGTTCGCCAGTTAATAGTTTGCGCAACGTTGTTGCCATTGCTACAGGCATCGTGGTGTCACGCTCGTCGTTTGGTATGGCTTCATTCAGCTCCGGTTCCCAACGATCAAGGCGAGTTACATGATCCCCCATGTTGTGCAAAAAAGCGGTTAGCTCCTTCGGTCCTCCGATCGTTGTCAGAAGTAAGTTGGCCGCAGTGTTATCACTCATGGTTATGGCAGCACTGCATAATTCTCTTACTGTCATGCCATCCGTAAGATGCTTTTCTGTGACTGGTGAGTACTCAACCAAGTCATTCTGAGAATAGTGTATGCGGCGACCGAGTTGCTCTTGCCCGGCGTCAATACGGGATAATACCGCGCCACATAGCAGAACTTTAAAAGTGCTCATCATTGGAAAACGTTCTTCGGGGCGAAAACTCTCAAGGATCTTACCGCTGTTGAGATCCAGTTCGATGTAACCCACTCGTGCACCCAACTGATCTTCAGCATCTTTTACTTTCACCAGCGTTTCTGGGTGAGCAAAAACAGGAAGGCAAAATGCCGCAAAAAAGGGAATAAGGGCGACACGGAAATGTTGAATACTCATACTCTTCCTTTTTCAATATTATTGAAGCATTTATCAGGGTTATTGTCTCATGAGCGGATACATATTTGAATGTATTTAGAAAAATAAACAAATAGGGGTTCCGCGCACATTTCCCCGAAAAGTGCCACCTGACGTC
Transfection protocol
Transfection protocol
1h 30m
1h 30m
Observe KOLF2.1 iPSCs under a phase contrast microscope to assess confluency and presence of cells debris. Dish should be dissociated at ~70% to 90% confluency.
Coat a well of 6 well plate to be used for transfection with 1 mL of Matrigel solution, tilting to ensure coverage of entire surface area. Place in 37 °C incubator for 00:30:00 .
30m
Prepare E8 medium supplemented with CEPT and place in at Room temperature to warm during dissociation.
Note
C.E.P.T is a cocktail that has been shown to improve the survival while transfection, however it can be used any other rock inhibitor as Y-27632 knowing that survival/transfection efficiency is not going to be as good as with CEPT.
Components of C.E.P.T cocktail
| A | B | C | D | E | |
| Reagent | Company | Cat. # | Final concentration | Target | |
| Chroman 1 | MedChem Express | HY-15392 | 50 nM | ROCK 2 inhibitor | |
| Emricasan | Selleckchem | S7775 | 5 uM | Activated Caspase inhibitors | |
| Polyamine supplement (1000X) | Sigma | P8483 | 1x (1:1000) | Cell growth booster | |
| Trans-ISRIB | Tocris | 5284 | 0.7 uM | Integrated stress response inhibitor |
All the component were prepared as desired concentration following the manufacture instructions of each one.
Aspirate culture medium from well/plate that should be dissociated and wash with PBS 1X.
Aspirate PBS and add half of culture volume of Accutase.
Transfer to 37 °C incubator for 00:10:00 .
Note
The time can vary by cell line and density (the optimal density is 70-90%) and the goal to use accutase is singularize as single cells.
10m
Meanwhile aspirate Matrigel from well and add 2 mL culture medium E8 supplemented with CEPT.
When Incubation is ready, tilt the plate and pipet the accutase solution two to three times up and down the culture surface to break the colonies.
Quench the Accutase adding half of the culture volume of PBS.
Transfer to a new conical tube and rinse with more PBS the culture surface, combine with the cell solution in the tube.
Centrifuge 00:05:00 at 200 - 300 x g at Room temperature .
5m
Aspirate supernatant and resuspend the cell pellet in culture medium E8 supplemented with CEPT.
Count cells and plate 1 - 1.5 x 106 cells into a Matrigel-coated well. Gently swirl plate to evenly distribute cells.
Return plate to 37 °C incubator.
After ~ 01:00:00 to 02:00:00 of plating cells , warm OptiMEM at Room temperature .
Note
Do not bring Lipofectamine Stem out of refrigerator until ready to be used!
3h
Prepare one tube with:
- 200 µL of OptiMEM
- Total of 3 µg of DNA mix in a 1:3 (Transposase:DNA) ratio
Note
EF1a-transposase sequence can be found in the materials section.
Alternatively investigators can try the commercial superpiggybac transposase from SBI, but activity may be lower in iPSCs due to the use of a CMV promoter (which is rapidly silenced) rather than an EF1a promoter
- 5 µL to 7.5 µL of Lipofectamine Stem
Note
Vortex after adding every reagent to Opti-MEM
Incubate transfection mix for 00:15:00 to 00:30:00 at Room temperature .
Note
Meanwhile, to remove debris and increase transfection efficiency, is recommended to wash the wells with PBS 1X and add 2 mL of fresh E8 supplemented with CEPT.
This step can be skipped when using CEPT but not when using rock inhibitor.
45m
Add transfection mix from step 15 to cells drop wise and immediately swirl the plate to evenly distribute the mix to cells.
Return plate to 37 °C incubator.
Next day, check for nuclear BFP positive signal (for PB-TO-hNGN2-BFP plasmid). If a positive transfection occurred and the well is confluent, re-plate the cells and puromycin select 24-48 h after transfection (it all depends on the health and transfection efficiency of the cells) with 8 Mass Percent for 2 to 14 days.
Note
One can start puromycin selection with low dose as 1 Mass Percent and see how the cells react, then increase as convenient to reach 8 Mass Percent .
Change media accordingly and expand cells when they reach 70-90% confluency.