Cellular decision-making mechanisms are crucial for the proper development of an organism. However, the process by which cells process and transmit incoming information is not fully understood, making it an intriguing subject. Transcription factors, whose effects on development are well-known, play a vital role in conveying information from the cellular environment to gene regulators. The Yes-Associated Protein (YAP), recognized as a transcriptional regulator, serves as the primary effector of the Hippo pathway, governing cell growth and proliferation. Functionally, YAP operates as a pleiotropic transcriptional regulator. While previous studies have elucidated the signaling modules of YAP, additional information is needed to comprehend the specific gene regulatory programs controlled by YAP and the underlying mechanisms in cellular decision-making.
In this investigation, Meyer and colleagues explored the role of YAP, a transcriptional regulator, in governing cell fate and proliferation through pluripotent. The study employed optogenetics, live imaging of transcription, and cell fate analysis in mouse embryonic stem cells (mESCs) to comprehend and manipulate gene activation and cellular behavior. The research defines the molecular logic of a dynamic code decoder driven by Oct4, an adaptable change sensor. These findings illustrate how the levels and dynamics of YAP facilitate the replication of information transfer for the regulation of developmental decision-making.
The study also presented evidence that YAP regulates Oct4 at the gene regulatory level. Researchers sought to unravel how YAP activation resolves steady-state concentrations and timing to control cell proliferation, cell fate, and the expression of pluripotency regulators such as Oct4 and Nanog. Furthermore, oscillating YAP inputs were observed to optimally induce Oct4 expression and proliferation in mESCs, mimicking frequencies found in natural dynamics. The research introduced a light-gated YAP signaling toolkit that computationally interfaces with YAP signaling, enabling the construction of complex feedback control systems. The LEXY-YAP tool, dynamically controlling YAP concentration in the nucleus, was utilized to investigate how YAP regulates Oct4 and Nanog. As a result, chronic light exposure induced lower YAP levels, leading to Oct4 induction. In contrast, oscillating light, even at high YAP levels, was found to be significantly sufficient for Oct4 induction, with Nanog responding to smaller dynamic inputs than Oct4. Visualizing transcription in live cells using the MS2 system revealed that depleting YAP led to an increased expression of the Oct4 gene, providing evidence that YAP acts as a suppressor on Oct4, showcasing how Oct4 expression responds to acute changes in YAP.
Meyer and colleagues have demonstrated how YAP levels and activation timing enable information transfer in development and have created an artificial interface for the light-controlled manipulation of YAP-dependent stem cell behavior. Furthermore, they highlight the importance of signaling dynamics as a cellular communication code, suggesting the potential use of synthetic YAP signaling inputs for tissue engineering and biomedical applications.
In light of all these findings, it can be said that modulation of specific levels and dynamics of YAP is sufficient to guide cellular differentiation and proliferation. These results provide a framework for understanding how YAP acts as a fate determinant in cellular decision-making mechanisms.
Translator: Begüm Kargılı
Editor: Elif Duymaz
Reference: Meyer, K., Lammers, N. C., Bugaj, L.J., Garcia, H. G., Weiner, O. D. (2023). Optogenetic control of YAP reveals a dynamic communication code for stem cell fate and proliferation. Nature Communications, 14, 6929,(2023) https://doi.org/10.1038/s41467-023-42643-2
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