Powered by RND
PodcastsCienciasEpigenetics Podcast

Epigenetics Podcast

Active Motif
Epigenetics Podcast
Último episodio

Episodios disponibles

5 de 163
  • Region Capture Micro-C and 3D Genome Structure (Anders Sejr Hansen)
    In this episode of the Epigenetics Podcast, we talked with Anders Sejr Hansen from MIT about his work on the impact of 3D genome structures on gene expression, the roles of proteins like CTCF and cohesin, and advanced techniques like Region Capture Micro-C for mapping genome organisation. Dr. Sejr Hansen introduces his research focusing on the relationship between three-dimensional genome structure and function, specifically how these structures can influence gene expression. He elaborates on the importance of transcription factors and the role of looping structures in gene regulation, emphasizing the implications of his work for understanding gene functionality in the context of both development and disease. The conversation then shifts to discussing loop extrusion and the factors affecting loop stability, primarily CTCF and cohesin. Dr. Sejr Hansen highlights the dynamics of these proteins' binding interactions and how their speeds challenge the notion of stable looping structures in the genome. With a keen interest in CTCF's role, he explains how the protein interacts with DNA and the mechanistic aspects of transcription factor movement, alluding to research findings that reveal that CTCF and cohesin tend to form clusters which may play vital roles in establishing chromatin structure. As the interview progresses, Dr. Sejr Hansen details his transition to leading his own lab at MIT, emphasizing the continuation of his earlier work while expanding into new methodologies for studying chromatin. He underscores the importance of understanding not just the static structures of DNA interactions, but the dynamic nature of these relationships and how they influence gene expression. His lab's recent focus has included using advanced imaging techniques to assess the dynamics of chromatin interactions more precisely. The discussion then touches on specific findings from Dr. Sejr Hansen's lab regarding the relationship between genome organization and double-strand break repair mechanisms. He emphasizes how the repair machinery can affect chromatin structure and underscores the essential role of cohesin in facilitating effective double-strand break repair by keeping broken DNA ends in proximity. He suggests that loop extrusion might help prevent genetic material from diffusing too far apart and improve the efficiency of repair. Dr. Sejr Hansen also discusses innovations in genome mapping techniques, particularly the development of Region Capture Micro-C, which facilitates deeper insights into the three-dimensional organization of the genome. This method allows researchers to achieve significantly higher resolution in their analyses compared to traditional 3D genomics techniques like Hi-C. He outlines the technical process and the implications of their findings, especially regarding enhancer-promoter interactions and the surprisingly promiscuous nature of these relationships. References Anders S Hansen, Iryna Pustova, Claudia Cattoglio, Robert Tjian, Xavier Darzacq (2017) CTCF and cohesin regulate chromatin loop stability with distinct dynamics eLife 6:e25776 https://doi.org/10.7554/eLife.25776 Claudia Cattoglio, Iryna Pustova, Nike Walther, Jaclyn J Ho, Merle Hantsche-Grininger, Carla J Inouye, M Julius Hossain, Gina M Dailey, Jan Ellenberg, Xavier Darzacq, Robert Tjian, Anders S Hansen (2019) Determining cellular CTCF and cohesin abundances to constrain 3D genome models eLife 8:e40164 https://doi.org/10.7554/eLife.40164 Goel, V.Y., Huseyin, M.K. & Hansen, A.S. Region Capture Micro-C reveals coalescence of enhancers and promoters into nested microcompartments. Nat Genet 55, 1048–1056 (2023). https://doi.org/10.1038/s41588-023-01391-1 Related Episodes Biophysical Modeling of 3-D Genome Organization (Leonid Mirny) Unraveling Mechanisms of Chromosome Formation (Job Dekker) Contact Epigenetics Podcast on Mastodon Epigenetics Podcast on Bluesky Dr. Stefan Dillinger on LinkedIn Active Motif on LinkedIn Active Motif on Bluesky Email: [email protected]
    --------  
    1:03:40
  • Reprogramming Cell Identity through Epigenetic Mechanisms (Vincent Pasque)
    In this episode of the Epigenetics Podcast, we talked with Vincent Pasque from KU Leuven about his work on the reprogramming of cell identity through epigenetic mechanisms, particularly during early development and cellular reprogramming. We begin by tracing Vincent's journey into biology, sparked by early childhood experiences in nature and meaningful encounters with inspiring teachers. His fascination with the complexities of biology crystallized during a pivotal moment while listening to a radio segment on epigenetics in the late '90s, which led him to pursue studies in genetics and biochemistry. This formative path brought him to leading institutions, including the prestigious lab of John Gurdon, where he explored the phenomenon of nuclear reprogramming. Vincent recounts his early experiments that led to the discovery of macro H2A as a barrier to reprogramming, emphasizing the core challenge of erasing somatic cell identity. As the conversation unfolds, Vincent introduces us to critical findings from his research. He shares how the inactive X chromosome serves as a compelling model to investigate epigenetic regulation, revealing that the dynamics of reprogramming and differentiation are far from simple reversals of development. He highlights the significant differences between male and female iPSCs and how X-linked genes influence DNA methylation and differentiation rates in these cells. The implications of these findings extend beyond developmental biology to inform our understanding of diseases, particularly cancer. Transitioning to his current work, Vincent describes pioneering advances in characterizing the chromatin-associated proteome during the differentiation of human pluripotent stem cells. The surprising discovery of elevated histone modifications in naïve cells leads to intriguing questions about the barriers to cellular plasticity and the mechanisms by which cells resist alternative fate conversions. The potential applications of this research could reshape our approach to regenerative medicine and therapeutic interventions. References Pasque V, Gillich A, Garrett N, Gurdon JB. Histone variant macroH2A confers resistance to nuclear reprogramming. The EMBO Journal. 2011 May;30(12):2373-2387. DOI: 10.1038/emboj.2011.144. PMID: 21552206; PMCID: PMC3116279. Jullien, J., Miyamoto, K., Pasque, V., Allen, G. E., Bradshaw, C. R., Garrett, N. J., Halley-Stott, R. P., Kimura, H., Ohsumi, K., & Gurdon, J. B. (2014). Hierarchical Molecular Events Driven by Oocyte-Specific Factors Lead to Rapid and Extensive Reprogramming. Molecular Cell, 55(4), 524–536. https://doi.org/10.1016/j.molcel.2014.06.024 Pasque V, Tchieu J, Karnik R, et al. X chromosome reactivation dynamics reveal stages of reprogramming to pluripotency. Cell. 2014 Dec;159(7):1681-1697. DOI: 10.1016/j.cell.2014.11.040. PMID: 25525883; PMCID: PMC4282187. Zijlmans DW, Talon I, Verhelst S, et al. Integrated multi-omics reveal polycomb repressive complex 2 restricts human trophoblast induction. Nature Cell Biology. 2022 Jun;24(6):858-871. DOI: 10.1038/s41556-022-00932-w. PMID: 35697783; PMCID: PMC9203278. Related Episodes The Discovery of Genomic Imprinting (Azim Surani) Gene Expression Control and Intricacies of X-chromosome Inactivation (Claire Rougeulle) Epigenetics and X-Inactivation (Edith Heard) Contact Epigenetics Podcast on Mastodon Epigenetics Podcast on Bluesky Dr. Stefan Dillinger on LinkedIn Active Motif on LinkedIn Active Motif on Bluesky Email: [email protected]
    --------  
    40:54
  • The Impact of Chromatin Architecture on Alzheimer's and Parkinson's Disease (Ryan Corces)
    In this episode of the Epigenetics Podcast, we talked with Ryan Corces from the Gladstone Institutes about his work on the impact of chromatin architecture on Alzheimer's and Parkinson's Disease. The discussion begins in discussing he start of Dr. Corces research career and he shares his groundbreaking findings in acute myeloid leukemia (AML), demonstrating how mutations occurring in hematopoietic stem cells lead to the evolution of this disease. He emphasizes the pivotal role of epigenetic modifiers and how these insights steered his focus towards epigenetic research. As the conversation progresses, Dr. Corces covers his transition to a postdoctoral role, emphasizing his collaborative work employing the ATAC-seq technique. He details how refinements to this protocol not only improved data quality but also paved the way for more expansive research within the fields of hematology and cancer genetics. Additionally, he discusses his excitement for developing new computational tools for single-cell analysis, aiming to address the critical challenge of distinguishing between cellular states effectively. The episode also explores the fascinating intersection of Alzheimer’s and Parkinson’s diseases. Dr. Corces explains the rationale for studying both conditions simultaneously, shedding light on the shared and divergent pathological features that emerge in patients. He argues for the importance of understanding mixed pathologies, which reflect the reality for many individuals diagnosed with these neurodegenerative diseases. References Corces, M. R., Trevino, A. E., Hamilton, E. G., Greenside, P. G., Sinnott-Armstrong, N. A., Vesuna, S., Satpathy, A. T., Rubin, A. J., Montine, K. S., Wu, B., Kathiria, A., Cho, S. W., Mumbach, M. R., Carter, A. C., Kasowski, M., Orloff, L. A., Risca, V. I., Kundaje, A., Khavari, P. A., Montine, T. J., … Chang, H. Y. (2017). An improved ATAC-seq protocol reduces background and enables interrogation of frozen tissues. Nature methods, 14(10), 959–962. https://doi.org/10.1038/nmeth.4396 Corces, M. R., Granja, J. M., Shams, S., Louie, B. H., Seoane, J. A., Zhou, W., Silva, T. C., Groeneveld, C., Wong, C. K., Cho, S. W., Satpathy, A. T., Mumbach, M. R., Hoadley, K. A., Robertson, A. G., Sheffield, N. C., Felau, I., Castro, M. A. A., Berman, B. P., Staudt, L. M., Zenklusen, J. C., … Chang, H. Y. (2018). The chromatin accessibility landscape of primary human cancers. Science (New York, N.Y.), 362(6413), eaav1898. https://doi.org/10.1126/science.aav1898 Corces, M. R., Trevino, A. E., Hamilton, E. G., Greenside, P. G., Sinnott-Armstrong, N. A., Vesuna, S., Satpathy, A. T., Rubin, A. J., Montine, K. S., Wu, B., Kathiria, A., Cho, S. W., Mumbach, M. R., Carter, A. C., Kasowski, M., Orloff, L. A., Risca, V. I., Kundaje, A., Khavari, P. A., Montine, T. J., … Chang, H. Y. (2017). An improved ATAC-seq protocol reduces background and enables interrogation of frozen tissues. Nature methods, 14(10), 959–962. https://doi.org/10.1038/nmeth.4396 Sant, C., Mucke, L., & Corces, M. R. (2025). CHOIR improves significance-based detection of cell types and states from single-cell data. Nature genetics, 57(5), 1309–1319. https://doi.org/10.1038/s41588-025-02148-8 Related Episodes ATAC-Seq, scATAC-Seq and Chromatin Dynamics in Single-Cells (Jason Buenrostro) Multiple challenges of ATAC-Seq, Points to Consider (Yuan Xue) Contact Epigenetics Podcast on Mastodon Epigenetics Podcast on Bluesky Dr. Stefan Dillinger on LinkedIn Active Motif on LinkedIn Active Motif on Bluesky Email: [email protected]
    --------  
    45:41
  • RNA-Mediated Epigenetic Regulation (Mo Motamedi)
    In this episode of the Epigenetics Podcast, we talked with Mo Motamedi from the Center for Cancer Research at Massachusetts General Hospital about his work on RNA-mediated epigenetic regulation. The Interview starts with Dr. Motamedi sharing his personal journey into the realm of biology, sparked by a familial inclination towards science and a challenge to excel in a field that initially felt daunting. His passion was ignited during a genetics class, as he recognized the quantitative nature of the discipline amidst the evolution of modern techniques like qPCR and high-throughput sequencing. Dr. Motamedi goes on to articulate the importance of understanding the interplay between genetics and broader biological systems, emphasizing that an insightful grasp of evolution is vital for decoding cellular mechanisms. He reflects on his time in a postdoctoral lab under Danesh Moazed, investigating RNA interference (RNAi) and its unexpected nuclear roles, contributing significantly to the understanding of how RNAi is involved in gene silencing via chromatin interaction. As his narrative unfolds, Dr. Motamedi provides deep insights into his own lab's work, which focuses on the establishment and maintenance of epigenetic states and their implications in cancer epigenetics. He discusses groundbreaking discoveries related to RNAi and heterochromatin, detailing experiments that unveil how specific proteins contribute to transcriptional and post-transcriptional gene silencing. A pivotal theme emerges: the complex dynamics of genome evolution and chromatin organization can be reshaped under various biological contexts, including the quiescent state of cells under stress. Moreover, the discussion traverses recent publications from Dr. Motamedi's lab, revealing how they identify long non-coding RNAs that function as silencers at centromeres, an essential mechanism that aids in the establishment of heterochromatin independently of RNAi. His findings advocate for the idea that well-structured genome organization can lead to more efficient gene regulation, which can also be crucial in therapeutic contexts for various cancers. References Motamedi, M. R., Hong, E. J., Li, X., Gerber, S., Denison, C., Gygi, S., & Moazed, D. (2008). HP1 proteins form distinct complexes and mediate heterochromatic gene silencing by nonoverlapping mechanisms. Molecular cell, 32(6), 778–790. https://doi.org/10.1016/j.molcel.2008.10.026 Joh RI, Khanduja JS, Calvo IA, Mistry M, Palmieri CM, Savol AJ, Hoi Sui SJ, Sadreyev RI, Aryee MJ, and Motamedi M. Survival in quiescence requires the euchromatic deployment of Clr4/SUV39H by argonaute-associated small RNAs. † Mol Cell. 2016; 64: 1088-1101. J. S. Khanduja, R. I. Joh, M. M. Perez, J. A. Paulo, C. M. Palmieri, J. Zhang, A. O. D. Gulka, W. Haas, S.P. Gygi, M. Motamedi. RNA quality control factors nucleate Clr4/SUV39H and trigger constitutive heterochromatin assembly. Cell 2024. 187: 3262-3283. *Equal contributions R. I. Joh, M. S. Lawrence, M. J. Aryee, M. Motamedi. Gene clustering drives the transcriptional coherence of disparate biological pathways in eukaryotes. bioRxiv 2023. doi: 10.1101/2021.04.17.440292 *co-corresponding authors. J. S. Khanduja, M. Motamedi. Protocol for the development and use of spike-in control for chromatin immunoprecipitation (ChIP) of chromatin-binding proteins. Star Protocol 2025. 6: 104007. J. S. Khanduja, M. Motamedi. Protocol for chromatin immunoprecipitation of chromatin-binding proteins in Schizosaccharomyces pombe using a dual-crosslinking approach. Star Protocol 2025. 6: 103695. Related Episodes Evolutionary Forces Shaping Mammalian Gene Regulation (Emily Wong) Chromatin Evolution (Arnau Sebé-Pedrós) The Role of lncRNAs in Tumor Growth and Treatment (Sarah Diermeier) Contact Epigenetics Podcast on Mastodon Epigenetics Podcast on Bluesky Dr. Stefan Dillinger on LinkedIn Active Motif on LinkedIn Active Motif on Bluesky Email: [email protected]  
    --------  
    45:39
  • Evolutionary Forces Shaping Mammalian Gene Regulation (Emily Wong)
    In this episode of the Epigenetics Podcast, we talked with Emily Wong from the University of New South Wales in Sydney about her work on how evolution shapes mammalian genes. As the head of the Regulatory Systems Lab at the Victor Chang Cardiac Research Institute and an associate professor at UNSW, Emily’s research centers on gene control and enhancers. We delve into her pivotal 2017 publication in Nature Communications, where she investigated transcription factor binding in liver-specific contexts, shedding light on the regulatory mechanisms at play in mammals. Emily elaborates on her postdoctoral work at the European Bioinformatics Institute and the innovative hybrid systems she used to dissect genetic variation effects, which allowed her to differentiate between cis-regulatory and trans-regulatory influences. By employing techniques like ChIP-seq, she was able to illustrate the combinatorial effects of transcription factors on gene expression, paving the way for her collaborative efforts across disciplines and organisms. We also examine Emily's findings regarding enhancer function through comparative studies between zebrafish and marine sponges. Using historical data on conserved genetic sequences, she and her team identified enhancer regions that displayed activity in specific vertebrate cell types, despite their evolutionary divergence from sponges. This unexpected result suggests deeper insights into how enhancers can be co-opted for new functions as species evolve. Furthermore, we dive into Emily's latest ventures involving advanced methodologies such as chromatin accessibility profiling with ATAC-seq and how these insights can elucidate the genomic landscape of metazoan embryogenesis. She highlights significant correlations between enhancer turnover and DNA replication timing, suggesting evolutionary implications that should be taken into account in future genomic studies.   References Wong, E. S., Zheng, D., Tan, S. Z., Bower, N. I., Garside, V., Vanwalleghem, G., Gaiti, F., Scott, E., Hogan, B. M., Kikuchi, K., McGlinn, E., Francois, M., & Degnan, B. M. (2020). Deep conservation of the enhancer regulatory code in animals. Science, 370(6517), eaax8137. https://doi.org/10.1126/science.aax8137 Cornejo-Páramo, P., Petrova, V., Zhang, X. et al. Emergence of enhancers at late DNA replicating regions. Nat Commun 15, 3451 (2024). https://doi.org/10.1038/s41467-024-47391-5   Related Episodes Ultraconserved Enhancers and Enhancer Redundancy (Diane Dickel) Enhancer Communities in Adipocyte Differentiation (Susanne Mandrup) Enhancer-Promoter Interactions During Development (Yad Ghavi-Helm)   Contact Epigenetics Podcast on Mastodon Epigenetics Podcast on Bluesky Dr. Stefan Dillinger on LinkedIn Active Motif on LinkedIn Active Motif on Bluesky Email: [email protected]
    --------  
    42:19

Más podcasts de Ciencias

Acerca de Epigenetics Podcast

Discover the stories behind the science!
Sitio web del podcast

Escucha Epigenetics Podcast, Science Vs y muchos más podcasts de todo el mundo con la aplicación de radio.net

Descarga la app gratuita: radio.net

  • Añadir radios y podcasts a favoritos
  • Transmisión por Wi-Fi y Bluetooth
  • Carplay & Android Auto compatible
  • Muchas otras funciones de la app
Aplicaciones
Redes sociales
v7.23.11 | © 2007-2025 radio.de GmbH
Generated: 11/16/2025 - 3:02:42 PM