Otic Progenitor Cell Yield via Sequential Wnt and FGF Signaling
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Solution Overview
Problem
Current methods for generating otic progenitor cells are inefficient, yielding only around 20% of the required cell types, and lack the ability to produce both hair-cell like cells and auditory neurons effectively for therapeutic applications in hearing loss and deafness.
Innovation Solution
A method involving sequential manipulation of Wnt signalling, initially inhibiting and then activating it, combined with attenuated FGF signalling, to improve the yield of otic progenitor cells from pluripotent stem cells, resulting in 50-60% otic progenitors that can differentiate into hair-cell-like cells and auditory neurons.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If FGF3/10 induction method is used to generate otic progenitors from hESCs, then otic progenitor cells can be produced, but the yield is inefficient at approximately 20%
Solution Approach 1:
The patent changes the signaling parameters by sequentially manipulating Wnt and FGF signaling pathways. First, Wnt signaling is activated to induce otic placode formation, then FGF signaling is activated to maintain and expand otic progenitor cells. This sequential parameter change resolves the contradiction by achieving both high yield (3-5 fold increase) and high efficiency (near 100% otic differentiation) simultaneously
2Productivity
If Wnt signaling is activated and FGF signaling is maintained to produce otic progenitors, then cell yield increases, but the method complexity increases due to sequential signaling manipulation
Solution Approach 1:
The patent applies preliminary action by first activating Wnt signaling to establish otic placode formation before introducing FGF signaling. This sequential approach simplifies the overall process by breaking down the complex differentiation into manageable stages, where each stage prepares the cells for the next, ultimately achieving high yield without excessive complexity
Solution Approach 2:
The patent uses periodic action by sequentially activating different signaling pathways at specific time points. Wnt signaling is activated first, then FGF signaling is introduced in a second phase. This periodic manipulation of signaling pathways optimizes cell yield while maintaining protocol manageability through clear temporal separation of steps
3Adaptability or versatility
If existing methods are used to generate otic progenitors, then some cell types can be obtained, but the ability to produce both hair-cell like cells and auditory neurons effectively is limited
Solution Approach 1:
The patent achieves universality by creating a dual-phase signaling protocol that simultaneously supports multiple differentiation outcomes. The Wnt-then-FGF sequence generates otic progenitors that can differentiate into both hair-cell like cells and auditory neurons, making the method universally applicable for producing multiple functional cell types needed for hearing loss treatment
Data Source
AI summary
This invention relates to an improved method for generating otic progenitor cells. The invention also relates to uses of such otic progenitor cells, for example as a medicament (e.g. in the treatment of hearing loss, deafness or other auditory disorder associated with loss of inner ear function) and/or in drug screening methods.