DNase Hypersensitive Sites and Chromatin Remodeling Enzymes (Carl Wu)

In this episode of the Epigenetics Podcast, we talked with Carl Wu from John's Hopkins University about his work on nucleosome remodeling, histone variants, and the role of single-molecule imaging in gene regulation.

Our discussion starts with Carl Wu sharing his first significant milestones, a paper in "Cell" and the serendipitous discovery of DNA hypersensitive sites, which transformed our understanding of chromatin accessibility and its implications for gene regulation.

As we delve into Dr. Wu’s specific areas of research, he elaborates on the biochemistry of nucleosome remodeling and the intricate role of chromatin remodeling enzymes like NURF. We discuss how these enzymes employ ATP hydrolysis to reposition nucleosomes, making DNA accessible for transcription. He then explains the collaborative relationship between chromatin remodelers and transcription factors, showcasing the fascinating interplay that governs gene expression and regulatory mechanisms.

The conversation takes a deeper turn as we explore Carl Wu’s groundbreaking studies on histone variants, particularly H2AZ. He elucidates the role of SWR1 in facilitating the exchange between H2A and H2AZ in nucleosome arrays. The high-resolution structural insights garnered from recent studies reveal how the enzyme mediates histone eviction and insertion with remarkable precision, providing a clearer picture of chromatin dynamics at a molecular level.

References

• Wu, C., Bingham, P. M., Livak, K. J., Holmgren, R., & Elgin, S. C. (1979). The chromatin structure of specific genes: I. Evidence for higher order domains of defined DNA sequence. Cell, 16(4), 797–806. https://doi.org/10.1016/0092-8674(79)90095-3

• Wu, C., Wong, Y. C., & Elgin, S. C. (1979). The chromatin structure of specific genes: II. Disruption of chromatin structure during gene activity. Cell, 16(4), 807–814. https://doi.org/10.1016/0092-8674(79)90096-5

• Wu C. (1980). The 5' ends of Drosophila heat shock genes in chromatin are hypersensitive to DNase I. Nature, 286(5776), 854–860. https://doi.org/10.1038/286854a0

• Wu, C., Wilson, S., Walker, B., Dawid, I., Paisley, T., Zimarino, V., & Ueda, H. (1987). Purification and properties of Drosophila heat shock activator protein. Science (New York, N.Y.), 238(4831), 1247–1253. https://doi.org/10.1126/science.3685975

• Mizuguchi, G., Shen, X., Landry, J., Wu, W. H., Sen, S., & Wu, C. (2004). ATP-driven exchange of histone H2AZ variant catalyzed by SWR1 chromatin remodeling complex. Science (New York, N.Y.), 303(5656), 343–348. https://doi.org/10.1126/science.1090701

• Kim, J. M., Visanpattanasin, P., Jou, V., Liu, S., Tang, X., Zheng, Q., Li, K. Y., Snedeker, J., Lavis, L. D., Lionnet, T., & Wu, C. (2021). Single-molecule imaging of chromatin remodelers reveals role of ATPase in promoting fast kinetics of target search and dissociation from chromatin. eLife, 10, e69387. https://doi.org/10.7554/eLife.69387

Related Episodes

• Multiple challenges of ATAC-Seq, Points to Consider (Yuan Xue)

• Pioneer Transcription Factors and Their Influence on Chromatin Structure (Ken Zaret)

• ATAC-Seq, scATAC-Seq and Chromatin Dynamics in Single-Cells (Jason Buenrostro)

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