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Description
Human iPSC-Derived Neural Stem Cells that have been genetically edited using CRISPR-Cas9 technology to introduce the V337M mutation (GTG>ATG) in the MAPT gene. This line is heterozygous for the V337M mutation where 1 allele has the mutation and the other allele is wild type. Click on the product images to see the data and further details.
The V337M mutation in MAPT has been implicated in frontotemporal dementia and may have a role in Alzheimer's disease. The mutation leads to accelerated aggregation of MAPT/tau protein into filament structures (Nacharaju et al., 1999) and makes the MAPT/tau protein more susceptible to hyperphosphorylation (Alonso et al., 2004).
Product Specification
| Starting material | Dermal fibroblast |
| Donor gender | Female |
| Donor age at sampling | 64 yrs |
| Karyotype | Normal |
| Reprogramming method | Episomal vector |
| Induction method | Monolayer & chemically defined medium |
| Genetic modification | Heterozygous for the MAPT V337M mutation (GTG>ATG) |
| Genetic modification | Contains a puromycin resistance cassette (intronic) |
| Size | ≥1.5 million cells |
| Growth properties | Adherent |
| Shipping conditions | Dry ice |
| Storage conditions | Liquid nitrogen |
Frequently Asked Questions
I want to carry out imaging/confocal microscopy, how should I plate the cells?
Plate the cells on Readyset + Surebond (ax0052)
For cortical neurogenesis, when do I switch from the Neural Differentiation-XF medium to Neural Maintenance Medium-XF?
Please switch to the Maintenance Medium-XF after the suggested period of Neural differentiation medium-XF treatment (see page 12 and 15 of the Human iPSC-Derived Neural Stem Cell Master Protocol below).
I am not sure what coating I should use for iPSC-derived neural stem cells?
We recommend SureBond-XF: Xeno-free coating reagent (Ax0053) in combination with Poly-D-Lysine (Sigma Aldrich, P7405)
A sheet of neurons is peeling from the corners , is this normal and can I stop it?
Please make sure you change medium gently and avoid adding the medium from one side of the wells throughout the 5-6 weeks of culture. If the cells start to peel from the corners, it can be repaired by adding Surebond (ax0041) into your standard feeding media. Usually, we use 120 uL Surebond in 12 mL medium for a few days until the layer re-attach. This can be applied no matter what coating has been used.
Can I use other coating reagents such as Poly-D-Lysine?
We only recommend using SureBond-XF (Ax0053) in combination with Poly-D-Lysine (Sigma Aldrich, P7405).
Can the iPSC-derived NSCs be expanded and frozen down again?
We do not recommend expansion or re-freezing of the the NSCs. Axol cannot guarantee the viability of the iPSC-derived NSCs and functionality of the neurons derived after re-freezing or expansion.
When would I expect to see synaptic activity?
At day 21, spontaneous synaptic activities should be detected, and day 35 synchronised burst firing should occur.
What is the composition of pure neuronal population in terms of cell types?
It is possible to achieve a 90% pure population of cerebral cortical neurons after terminal differentiation using Neural Differentiation-XF Medium (System B). Repeated expansion of the NSCs will increase the glial population and conversely decrease the neuronal population.
What is the ratio of cortical deep layer neurons (Tbr1 & Ctip2 positive) and upper layer neurons (CUX1 & BRN2 positive) after Axol iPSC-derived NSC differentiation?
The ratio of deep to upper layer neurons will change with the number of days in culture. After 2 weeks in Neural Maintenance-XF Medium, approx. 60% of neurons express deep layer markers but this will decrease with length of time in culture. We would recommend spontaneous differentiation for over 40 days to see a large percentage of upper layer neurons.
Will I be able to detect long-term potentiation and long-term depression?
Yes, Axol iPSC-Derived Cortical Neurons when co-cultured with astrocytes have been shown to respond to high frequency stimulation resulting in a change in spike frequency presenting as a depression of potentiation of network transmission.
What markers are commonly used to detect the Cortical NSCs?
We typically use PAX6, SOX2, Nestin, FOXG1, OTX, ASPM, N-cadherin and Ki67 to identify NSCs.
What markers are commonly used to detect neurons?
NeuN, TBR1, TUJ1, MAP2, GAD67, VGLUT1, Synaptophysin, CTIP2, CUX1 and BRN2 can be used to identify cerebral cortical neurons.
Technical Resources
References
- Nacharaju P, Lewis J, Easson C, Yen S, Hackett J, Hutton M, Yen SH. Accelerated filament formation from tau protein with specific FTDP-17 missense mutations. FEBS Lett. (1999)
- Alonso Ad, Mederlyova A, Novak M, Grundke-Iqbal I, Iqbal K. Promotion of hyperphosphorylation by frontotemporal dementia tau mutations. J Biol Chem. (2004)