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Description
Human iPSC-Derived Neural Stem Cells that have been genetically edited using CRISPR-Cas9 technology to introduce the P301L mutation (CCG>CTG) into the MAPT gene. This line is heterozygous for the P301L mutation where one allele contains the mutation and the other allele is wild type at the locus. Click on the product images to see the data and further details.
The P301L mutation MAPT has been implicated in frontotemporal dementia and parkinsonism (Dumanchin et al., 1998). The mutation affects only the 4R isoforms of MAPT since the exon containing the mutation is spliced out of 3R isoforms (Hutton et al., 1998). Aggregated MAPT/tau protein in affected patients consisted mainly of the 4R isoform (Hutton et al., 1998). The P301L mutation promotes aggregation of MAPT/tau protein into ordered paired helical filaments and beta sheet formation in vitro (von Bergen et al., 2001).
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 P301L mutation (CCG>CTG) |
| 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
- Dumanchin C, Camuzat A, Campion D et al. Segregation of a missense mutation in the microtubule-associated protein tau gene with familial frontotemporal dementia and parkinsonism. Human Molecular Genetics (1998)
- Hutton M, Lendon CL, Rizzu P et al. Association of missense and 5'-splice-site mutations in tau with the inherited dementia FTDP-17. Nature (1998)
- von Bergen M, Barghorn S, Li L et al. Mutations of tau protein in frontotemporal dementia promote aggregation of paired helical filaments by enhancing local beta-structure. The Journal of Biological Chemistry (2001)