Tumour cells alter 3D structure of DNA to boost activity of oncogenes
Appeared in BioNews 1095
Using a new algorithmic approach, scientists have found that cancer cells can hijack the normal chromosome structure to increase the activity of cancer-promoting genes.
Tumour cells can differ from normal cells in many different ways, but all these differences are rooted in changes to the DNA of the cell s genome. Researchers in Switzerland have been focusing on the DNA organisation within chromosomes to understand how cells modify the expression of oncogenes – genes known to promote tumour growth – and have designed an algorithm called Calder to track how epigenetic changes can influence the interactions of different genomic regions.
Researchers study how cancer cells re-organize 3D structure of DNA to ramp up oncogene activity
In cancer, a lot of biology goes awry: Genes mutate, molecular processes change dramatically, and cells proliferate uncontrollably to form entirely new tissues that we call tumors. Multiple things go wrong at different levels, and this complexity is partly what makes cancer so difficult to research and treat.
So it stands to reason that cancer researchers focus their attention where all cancers begin: the genome. If we can understand what happens at the level of DNA, then we can perhaps one day not just treat but even prevent cancers altogether.
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Cancer cells hijack 3D structure of DNA
Scientists at EPFL and UNIL have used a novel algorithmic approach on cancer cells to understand how changes in histone marks (H3K27ac) induce repositioning of chromatin regions in the cell nucleus, and described how modifications of local contacts between regulatory elements (enhancers and promoters) influence oncogene expression.
In cancer, a lot of biology goes awry: Genes mutate, molecular processes change dramatically, and cells proliferate uncontrollably to form entirely new tissues that we call tumors. Multiple things go wrong at different levels, and this complexity is partly what makes cancer so difficult to research and treat.
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In cancer, a lot of biology goes awry: Genes mutate, molecular processes change dramatically, and cells proliferate uncontrollably to form entirely new tissues that we call tumors. Multiple things go wrong at different levels, and this complexity is partly what makes cancer so difficult to research and treat.
So it stands to reason that cancer researchers focus their attention where all cancers begin: the genome. If we can understand what happens at the level of DNA, then we can perhaps one day not just treat but even prevent cancers altogether.
This drive has led a team of researchers from EPFL and the University of Lausanne (UNIL) to make a breakthrough discovery concerning a critical genetic aberration that occurs in cancer. Working together, the groups of Elisa Oricchio (EPFL) and Giovanni Ciriello (UNIL) have used a novel algorithm-based method to study how cancer cells re-organize the 3D structure of their DNA in order to ramp up the activity of cancer-promoting ge