In this episode of the Epigenetics Podcast, we talked with Michaela Frye from he German Cancer Research Center (DKFZ) in Heidelberg about her work on the role of RNA modifications and RNA binding proteins in gene expression and cancer development.

Central to Dr. Frey’s work is the NSUN family of RNA-modifying proteins, which she first encountered during her postdoctoral research. Initially perceived as a DNA methyltransferase, she unwittingly discovered that this family also plays vital roles in RNA methylation. Her exploration revealed that these proteins significantly affect gene stability and translation processes, especially under stress, making them critical players in cancer pathology.

As her research progressed, Frey transitioned into her own lab, where she continued exploring RNA modifications in the context of skin and cancer cells. She emphasizes the critical distinction between the roles of different RNA modifications in various cellular contexts, especially highlighting the differences between steady-state stem cells and those undergoing differentiation or stress responses. Frey's lab investigates how these modifications regulate translational processes, which are essential for cellular adaptation to environmental changes.

Frey further discusses her findings related to the NSUN proteins in stem cell function and their implications for germ cell differentiation in testes. This intricate relationship between RNA modifications and cellular dynamics underscores the significance of epitranscriptomics in understanding cancer treatment resistance and cellular adaptation mechanisms.

Recent findings from her team at DKFZ show a compelling connection between mitochondrial function and RNA modifications in cancer cells. Frey articulates a newfound interest in how these modifications influence cellular responses to cancer therapies, particularly how their regulation may mitigate treatment resistance.

Reflecting on the evolution of RNA modification research, she notes that the field has matured rapidly but acknowledges the challenges posed by abundant yet often contradictory findings. Frey advocates for a clearer understanding of the fundamental functions of distinct RNA modifications to harness their potential in therapeutic contexts effectively.

References

Blanco S, Kurowski A, Nichols J, et al. The RNA-methyltransferase Misu (NSun2) poises epidermal stem cells to differentiate. Plos Genetics. 2011 Dec;7(12):e1002403. DOI: 10.1371/journal.pgen.1002403. PMID: 22144916; PMCID: PMC3228827
Hussain S, Tuorto F, Menon S, et al. The mouse cytosine-5 RNA methyltransferase NSun2 is a component of the chromatoid body and required for testis differentiation. Molecular and Cellular Biology. 2013 Apr;33(8):1561-1570. DOI: 10.1128/mcb.01523-12. PMID: 23401851; PMCID: PMC3624257
Blanco S, Bandiera R, Popis M, et al. Stem cell function and stress response are controlled by protein synthesis. Nature. 2016 Jun;534(7607):335-340. DOI: 10.1038/nature18282. PMID: 27306184; PMCID: PMC5040503
Delaunay S, Pascual G, Feng B, et al. Mitochondrial RNA modifications shape metabolic plasticity in metastasis. Nature. 2022 Jul;607(7919):593-603. DOI: 10.1038/s41586-022-04898-5. PMID: 35768510; PMCID: PMC9300468.

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RNA modifications and Gene Expression (Michaela Frye)