Israeli scientist and colleagues discover promising target for breast cancer and other cancer therapeutics

The collaborating research teams have identified and characterised a new methylation event, catalysed by the methyltransferase SETD6, on the transcription factor BRD4. BRD4 has a fundamental role in the regulation of gene expression and thus became a promising epigenetic therapeutic candidate to target diverse pathologies

Ben-Gurion University of the Negev and National Institute for Biotechnology in the Negev (NIBN) scientist Professor Dan Levy has discovered a novel mechanism which is a promising target for cancer therapeutics.

“Our perception of the specific multi-step molecular mechanistic process which regulates cancer initiation and progression found in this study, may allow us to develop new therapeutic strategies to optimise cancer treatment. While we investigated this mechanism in breast cancer models, we are currently expanding it to other cancer types such as melanoma and glioblastoma,” said Professor Levy.

The findings were published in Science Advances.

“Our understanding of human cancer progression and treatment largely depends on our ability to scientifically explore and deeply decipher the different cellular events which control these processes. A central process which regulates cancer pathology is gene expression, or in other words, what are the mechanisms which turn a gene on or off? Can we control a selective gene expression to obtain a delicate balance in cancer-related cellular processes? Can we direct specific cellular factors to regulate this process? Obtaining such a balance will enable the cell to decide which genes to activate in a given time and tissue which will subsequently determine if a cell will become malignant or not,” explains Proffesor Levy.

This process is partly maintained by post-translational modifications. One such modification is methylation, which refers to the addition of a chemical moiety (a methyl group) to a iysine residue in a given protein.

In this paper, the collaborating research teams have identified and characterised a new methylation event, catalysed by the methyltransferase SETD6, on the transcription factor BRD4. BRD4 has a fundamental role in the regulation of gene expression and thus became a promising epigenetic therapeutic candidate to target diverse pathologies. In a comprehensive biochemical, molecular and genomics study, they have provided evidence that the methylation of BRD4 inhibits the expression of genes which are involved in translation and abolish protein synthesis in cells.

BRD4 methylation determines the recruitment of the transcription factor E2F1 to selected target genes which are involved in protein generation, a molecular mechanism which facilitates the balanced expression of these genes. Unbalanced gene expression involved in protein synthesis may lead to increased proliferation and transformation which can subsequently result in the initiation and progression of cancer.

Professor Levy is a member of the Shraga Segal Department of Microbiology, Immunology and Genetics in the Faculty of Health Sciences as well as The National Institute for Biotechnology in the Negev (NIBN).

The research was led by Dr Zlata Vershinin, a post-doc in Professor Levy’s lab, as part of an outstanding scientific collaboration with the research group of Dr Rab Prinjha (Glaxo smith Kline pharmaceutical company); Professor Mark Dawson (University of Melbourne); Panagis Filippakopoulos (Oxford University) and Dr Barak Rotblat and Dr Vered Caspi from Ben-Gurion University.

The research was supported by the Israel Science Foundation (ISF), The Research Career Development Award from the Israel Cancer Research Fund and from the Israel Cancer Association.

Professor Levy’s lab focuses on the study of additional protein methylation pathways such as cell cycles, programmed cell death, DNA damage control, DNA repair, adipocytes differentiation and more.

“These pathways and others have a direct effect on the development of diseases such as different types of cancer and metabolic diseases like diabetes, fatty liver, obesity, etc.,” said Professor Levy.

“Our research has great potential for the identification of new therapeutic targets. Indeed, our research group deals with the development of specific molecules to modulate the enzymatic and cellular activity of SETD6 and other methyltransferases. Such agents might be used in the future for the generation of therapy strategies,” said Professor Levy.