Epigenetics Podcast Active Motif

In this episode of the Epigenetics Podcast, we talked with Sarah Marzi from the UK Dementia Research Institute at Imperial College London about her work on epigenetic changes in Alzheimer's Disease, and comparing CUT&Tag to ENCODE ChIP-Seq using limited cell samples.
The interview discusses Sarah Marzi's work on ChIP-Seq experiments and their significance in understanding Alzheimer's disease from an epigenetic perspective. The discussion touches on the widespread dysregulation and changes in acetylation, particularly in genes associated with Alzheimer's risk, providing insights into potential links between epigenetic insults and disease onset.
Moving on to the technical aspects of the study, the interview examines the strategic use of CUT&Tag. It explores the challenges and optimizations involved in accurately profiling limited cell samples. The dialogue also compares CUT&Tag to ENCODE ChIP-Seq, highlighting the complexities of peak calling and data interpretation across different methodologies.
 
References

Kumsta, R., Marzi, S., Viana, J. et al. Severe psychosocial deprivation in early childhood is associated with increased DNA methylation across a region spanning the transcription start site of CYP2E1. Transl Psychiatry 6, e830 (2016). https://doi.org/10.1038/tp.2016.95


Marzi, S. J., Schilder, B. M., Nott, A., Frigerio, C. S., Willaime‐Morawek, S., Bucholc, M., Hanger, D. P., James, C., Lewis, P. A., Lourida, I., Noble, W., Rodriguez‐Algarra, F., Sharif, J., Tsalenchuk, M., Winchester, L. M., Yaman, Ü., Yao, Z., The Deep Dementia Phenotyping (DEMON) Network, Ranson, J. M., & Llewellyn, D. J. (2023). Artificial intelligence for neurodegenerative experimental models. Alzheimer’s & Dementia, 19(12), 5970–5987. https://doi.org/10.1002/alz.13479


Marzi, S. J., Leung, S. K., Ribarska, T., Hannon, E., Smith, A. R., Pishva, E., Poschmann, J., Moore, K., Troakes, C., Al-Sarraj, S., Beck, S., Newman, S., Lunnon, K., Schalkwyk, L. C., & Mill, J. (2018). A histone acetylome-wide association study of Alzheimer’s disease identifies disease-associated H3K27ac differences in the entorhinal cortex. Nature Neuroscience, 21(11), 1618–1627. https://doi.org/10.1038/s41593-018-0253-7


Hu, D., Abbasova, L., Schilder, B. M., Nott, A., Skene, N. G., & Marzi, S. J. (2022). CUT&Tag recovers up to half of ENCODE ChIP-seq peaks in modifications of H3K27 [Preprint]. Genomics. https://doi.org/10.1101/2022.03.30.486382

 
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In this episode of the Epigenetics Podcast, we talked with Mark Parthun from Ohio State University about his work on the role of Hat1p in chromatin assembly.
Mark Parthun shares insights into his pivotal paper in 2004 that explored the link between type B histone acetyltransferases and chromatin assembly, setting the stage for his current research interests in epigenetics. He highlights the role of HAT1 in acetylating lysines on newly synthesized histones, its involvement in double-strand break repair, and the search for phenotypes associated with HAT1 mutations.
The discussion expands to a collaborative research project between two scientists uncovering the roles of HAT1 and NASP as chaperones in chromatin assembly. Transitioning from yeast to mouse models, the team investigated the effects of HAT1 knockout on mouse phenotypes, particularly in lung development and craniofacial morphogenesis. They also explored the impact of histone acetylation on chromatin dynamics and its influence on lifespan, aging processes, and longevity.
 
References

Parthun, M. R., Widom, J., & Gottschling, D. E. (1996). The Major Cytoplasmic Histone Acetyltransferase in Yeast: Links to Chromatin Replication and Histone Metabolism. Cell, 87(1), 85–94. https://doi.org/10.1016/S0092-8674(00)81325-2


Kelly, T. J., Qin, S., Gottschling, D. E., & Parthun, M. R. (2000). Type B histone acetyltransferase Hat1p participates in telomeric silencing. Molecular and cellular biology, 20(19), 7051–7058. https://doi.org/10.1128/MCB.20.19.7051-7058.2000


Ai, X., & Parthun, M. R. (2004). The nuclear Hat1p/Hat2p complex: a molecular link between type B histone acetyltransferases and chromatin assembly. Molecular cell, 14(2), 195–205. https://doi.org/10.1016/s1097-2765(04)00184-4


Nagarajan, P., Ge, Z., Sirbu, B., Doughty, C., Agudelo Garcia, P. A., Schlederer, M., Annunziato, A. T., Cortez, D., Kenner, L., & Parthun, M. R. (2013). Histone acetyl transferase 1 is essential for mammalian development, genome stability, and the processing of newly synthesized histones H3 and H4. PLoS genetics, 9(6), e1003518. https://doi.org/10.1371/journal.pgen.1003518


Agudelo Garcia, P. A., Hoover, M. E., Zhang, P., Nagarajan, P., Freitas, M. A., & Parthun, M. R. (2017). Identification of multiple roles for histone acetyltransferase 1 in replication-coupled chromatin assembly. Nucleic Acids Research, 45(16), 9319–9335. https://doi.org/10.1093/nar/gkx545


Popova, L. V., Nagarajan, P., Lovejoy, C. M., Sunkel, B. D., Gardner, M. L., Wang, M., Freitas, M. A., Stanton, B. Z., & Parthun, M. R. (2021). Epigenetic regulation of nuclear lamina-associated heterochromatin by HAT1 and the acetylation of newly synthesized histones. Nucleic Acids Research, 49(21), 12136–12151. https://doi.org/10.1093/nar/gkab1044

 
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In this episode of the Epigenetics Podcast, we talked with Upasna Sharma from UC Santa Cruz about her work on a number of interesting projects on H2A.Z and telomeres, the impact of paternal diet on offspring metabolism, and the role of small RNAs in sperm.
In this interview Upasna Sharma discusses her work on the study of the paternal diet's impact on offspring metabolism. She reveals the discovery of small non-coding RNAs, particularly tRNA fragments, in mature mammalian sperm that may carry epigenetic information to the next generation. She explains the specific alterations in tRNA fragment levels in response to a low-protein diet and the connections found between tRNA fragments and metabolic status.
Dr. Sharma further explains the degradation and stabilization of tRNA fragments in cells and the processes involved in their regulation. She shares their observation of tRNA fragment abundance in epididymal sperm, despite the sperm being transcriptionally silent at that time. This leads to a discussion on the role of the epididymis in the reprogramming of small RNA profiles and the transportation of tRNA fragments through extracellular vesicles.
The conversation then shifts towards the potential mechanism of how environmental information could be transmitted to sperm and the observed changes in small RNAs in response to a low-protein diet. Dr. Sharma discusses the manipulation of small RNAs in embryos and mouse embryonic stem cells, revealing their role in regulating specific sets of genes during early development. However, the exact mechanisms that link these early changes to metabolic phenotypes are still being explored.
References

Sharma, U., Conine, C. C., Shea, J. M., Boskovic, A., Derr, A. G., Bing, X. Y., Belleannee, C., Kucukural, A., Serra, R. W., Sun, F., Song, L., Carone, B. R., Ricci, E. P., Li, X. Z., Fauquier, L., Moore, M. J., Sullivan, R., Mello, C. C., Garber, M., & Rando, O. J. (2016). Biogenesis and function of tRNA fragments during sperm maturation and fertilization in mammals. Science (New York, N.Y.), 351(6271), 391–396. https://doi.org/10.1126/science.aad6780


Sharma, U., Sun, F., Conine, C. C., Reichholf, B., Kukreja, S., Herzog, V. A., Ameres, S. L., & Rando, O. J. (2018). Small RNAs Are Trafficked from the Epididymis to Developing Mammalian Sperm. Developmental cell, 46(4), 481–494.e6. https://doi.org/10.1016/j.devcel.2018.06.023


Rinaldi, V. D., Donnard, E., Gellatly, K., Rasmussen, M., Kucukural, A., Yukselen, O., Garber, M., Sharma, U., & Rando, O. J. (2020). An atlas of cell types in the mouse epididymis and vas deferens. eLife, 9, e55474. https://doi.org/10.7554/eLife.55474

 
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In this episode of the Epigenetics Podcast, we talked with Weiwei Dang from Baylor College of Medicine about his work on molecular mechanisms of aging and the role of H3K36me3 and cryptic transcription in cellular aging.
The team in the Weiwei Dang lab explored the connection between histone marks, specifically H4K16 acetylation and H3K36 methylation, and aging. Dr. Dang describes how the lab conducted experiments by mutating H4K16 to determine its effect on lifespan. They observed that the mutation to glutamine accelerated the aging process and shortened lifespan, providing causal evidence for the relationship between H4K16 and lifespan. They also discovered that mutations in acetyltransferase and demethylase enzymes had opposite effects on lifespan, further supporting a causal relationship.
Weiwei Dang then discusses their expanded research on aging, conducting high-throughput screens to identify other histone residues and mutants in yeast that regulate aging. They found that most mutations at K36 shortened lifespan, and so they decided to follow up on a site that is known to be methylated and play a role in gene function. They discovered that H3K36 methylation helps suppress cryptic transcription, which is transcription that initiates from within the gene rather than at the promoter. Mutants lacking K36 methylation showed an aging phenotype. They also found evidence of cryptic transcription in various datasets related to aging and senescence, including C. elegans and mammalian cells.
References

Dang, W., Steffen, K., Perry, R. et al. Histone H4 lysine 16 acetylation regulates cellular lifespan. Nature 459, 802–807 (2009). https://doi.org/10.1038/nature08085


Sen, P., Dang, W., Donahue, G., Dai, J., Dorsey, J., Cao, X., Liu, W., Cao, K., Perry, R., Lee, J. Y., Wasko, B. M., Carr, D. T., He, C., Robison, B., Wagner, J., Gregory, B. D., Kaeberlein, M., Kennedy, B. K., Boeke, J. D., & Berger, S. L. (2015). H3K36 methylation promotes longevity by enhancing transcriptional fidelity. Genes & development, 29(13), 1362–1376. https://doi.org/10.1101/gad.263707.115


Yu, R., Cao, X., Sun, L. et al. Inactivating histone deacetylase HDA promotes longevity by mobilizing trehalose metabolism. Nat Commun 12, 1981 (2021). https://doi.org/10.1038/s41467-021-22257-2


McCauley, B.S., Sun, L., Yu, R. et al. Altered chromatin states drive cryptic transcription in aging mammalian stem cells. Nat Aging 1, 684–697 (2021). https://doi.org/10.1038/s43587-021-00091-x
 

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In this episode of the Epigenetics Podcast, we talked with Mitch Guttman from California Institute of Technology about his work on characterising the 3D interactions of the genome using Split-Pool Recognition of Interactions by Tag Extension (SPRITE).
Mitch Guttman discusses his exploration of the long non-coding RNA Xist, which plays a crucial role in X chromosome inactivation. He explains how they discovered that Xist is present everywhere in the nucleus, not just in specific locations on the X chromosome. Through their research, they identified critical proteins like SHARP that are involved in X chromosome silencing.
The discussion then shifts to SPRITE, a method they developed to map multi-way contacts and generalize beyond DNA to include RNA and proteins. They compare SPRITE to classical proximity ligation methods like Hi-C and discuss how cluster sizes in SPRITE can estimate 3D distances between molecules. The conversation also touches upon the potential of applying SPRITE to single-cell experiments, allowing for the mapping of higher order nucleic acid interactions and tracking the connectivity of DNA fragments in individual cells.
 
References

Jesse M. Engreitz et al., The Xist lncRNA Exploits Three-Dimensional Genome Architecture to Spread Across the X Chromosome. Science 341,1237973(2013). DOI:10.1126/science.1237973


Chun-Kan Chen et al., Xist recruits the X chromosome to the nuclear lamina to enable chromosome-wide silencing. Science 354, 468-472(2016). DOI: 10.1126/science.aae0047


Quinodoz, S. A., Ollikainen, N., Tabak, B., Palla, A., Schmidt, J. M., Detmar, E., Lai, M. M., Shishkin, A. A., Bhat, P., Takei, Y., Trinh, V., Aznauryan, E., Russell, P., Cheng, C., Jovanovic, M., Chow, A., Cai, L., McDonel, P., Garber, M., & Guttman, M. (2018). Higher-Order Inter-chromosomal Hubs Shape 3D Genome Organization in the Nucleus. Cell, 174(3), 744-757.e24. https://doi.org/10.1016/j.cell.2018.05.024


Goronzy, I. N., Quinodoz, S. A., Jachowicz, J. W., Ollikainen, N., Bhat, P., & Guttman, M. (2022). Simultaneous mapping of 3D structure and nascent RNAs argues against nuclear compartments that preclude transcription. Cell Reports, 41(9), 111730. https://doi.org/10.1016/j.celrep.2022.111730


Perez, A. A., Goronzy, I. N., Blanco, M. R., Guo, J. K., & Guttman, M. (2023). ChIP-DIP: A multiplexed method for mapping hundreds of proteins to DNA uncovers diverse regulatory elements controlling gene expression [Preprint]. Genomics. https://doi.org/10.1101/2023.12.14.571730

 
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In this episode of the Epigenetics Podcast, we talked with Yali Dou from Keck School of Medicine of USC about her work on MLL Proteins in Mixed-Lineage Leukemia.
To start off this Interview Yali describes her early work on MLL1 and its function in transcription, particularly its involvement in histone modification. She explains her successful purification of the MLL complex and the discovery of MOF as one of the proteins involved.
Next, the interview focuses on her work in reconstituting the MLL core complex and the insights gained from this process. She shares her experience of reconstituting the MLL complex and discusses her focus on the crosstalk of H3K4 and H3K79 methylation, regulated by H2BK34 ubiquitination.
The podcast then delves into the therapeutic potential of MLL1, leading to the discovery of a small molecule inhibitor. Finally, we talk about the importance of the protein WDR5 in the assembly of MLL complexes and how targeting the WDR5-ML interaction can inhibit MLL activity.
 
References

Dou, Y., Milne, T., Ruthenburg, A. et al. Regulation of MLL1 H3K4 methyltransferase activity by its core components. Nat Struct Mol Biol 13, 713–719 (2006). https://doi.org/10.1038/nsmb1128


Wu, L., Zee, B. M., Wang, Y., Garcia, B. A., & Dou, Y. (2011). The RING Finger Protein MSL2 in the MOF Complex Is an E3 Ubiquitin Ligase for H2B K34 and Is Involved in Crosstalk with H3 K4 and K79 Methylation. Molecular Cell, 43(1), 132–144. https://doi.org/10.1016/j.molcel.2011.05.015


Cao, F., Townsend, E. C., Karatas, H., Xu, J., Li, L., Lee, S., Liu, L., Chen, Y., Ouillette, P., Zhu, J., Hess, J. L., Atadja, P., Lei, M., Qin, Z. S., Malek, S., Wang, S., & Dou, Y. (2014). Targeting MLL1 H3K4 Methyltransferase Activity in Mixed-Lineage Leukemia. Molecular Cell, 53(2), 247–261. https://doi.org/10.1016/j.molcel.2013.12.001


Park, S.H., Ayoub, A., Lee, YT. et al. Cryo-EM structure of the human MLL1 core complex bound to the nucleosome. Nat Commun 10, 5540 (2019). https://doi.org/10.1038/s41467-019-13550-2

 
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