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Study Reveals how Ionising Radiation Damages DNA and Causes Cancer

By Health_Freedoms at Sept. 18, 2016, 4:03 p.m., 3424 hits

For the first time, researchers from the Wellcome Trust Sanger Institute and their collaborators have been able to identify in human cancers two characteristic patterns of DNA damage caused by ionising radiation. These fingerprint patterns may now enable doctors to identify which tumours have been caused by radiation, and investigate if they should be treated differently.

Published in Nature Communications today, the results will also help to explain how radiation can cause cancer.

Ionising radiation, such as gamma rays, X-rays and radioactive particles can cause cancer by damaging DNA. However, how this happens, or how many tumours are caused by radiation damage has not been known.

Previous work on cancer had revealed that DNA damage often leaves a molecular fingerprint, known as a mutational signature, on the genome of a cancer cell. The researchers looked for mutational signatures in 12 patients with secondary radiation-associated tumours, comparing these with 319 that had not been exposed to radiation.

Dr Peter Campbell from the Wellcome Trust Sanger Institute who led the study, said: “To find out how radiation could cause cancer, we studied the genomes of cancers caused by radiation in comparison to tumours that arose spontaneously. By comparing the DNA sequences we found two mutational signatures for radiation damage that were independent of cancer type. We then checked the findings with prostate cancers that had or had not been exposed to radiation, and found the same two signatures again. These mutational signatures help us explain how high-energy radiation damages DNA.”

One mutational signature is a deletion where small numbers of DNA bases are cut out. The second is called a balanced inversion, where the DNA is cut in two places, the middle piece spins round, and is joined back again in the opposite orientation. Balanced inversions don't happen naturally in the body, but high-energy radiation could provide enough DNA breaks at the same time to make this possible.

Dr Sam Behjati, clinician researcher at the Sanger Institute and the Department of Paediatrics, University of Cambridge, said: “Ionising radiation probably causes all types of mutational damage, but here we can see two specific types of damage and get a sense of what is happening to the DNA. Showers of radiation chop up the genome causing lots of damage simultaneously. This seems to overwhelm the DNA repair mechanism in the cell, leading to the DNA damage we see.”

Professor Adrienne Flanagan, a collaborating cancer researcher from University College London and Royal National Orthopaedic hospital, said: “This is the first time that scientists have been able to define the damage caused to DNA by ionising radiation. These mutational signatures could be a diagnosis tool for both individual cases, and for groups of cancers, and could help us find out which cancers are caused by radiation. Once we have better understanding of this, we can study whether they should be treated the same or differently to other cancers.”

http://medicalxpress.com/news/2016-09-reveals-ionising-dna-cancer.html

 
Posts [ 1 ] | Last post Sept. 18, 2016, 4:03 p.m.
#1 - Sept. 18, 2016, 4:03 p.m.
Kerry Crofton, PhD

This damage has been known for some time.

What is less known is that non-ionizing, non-thermal, radiation – from the microwaves emitted by your cell phone, WiFi, Bluetooth and all things wireless, including wireless baby monitors, Smart appliances, wearable tech etc - has also been shown to damage DNA.

This research was published and peer-reviewed by Drs Lai and Singh many years ago.

Non-ionizing radiation is not strong enough to heat human tissue, however, there is evidence of harm from these so-called ‘low’ levels.

Part of the problem with the mass globalization of this microwave exposure is that safety standards are set only at the thermal/ionizing levels, ignoring the damage from the non-thermal, non-ionizing levels.

What does this mean to human health?

Every time you hold a mobile phone to your head, have an iPad in your lap, your children in a WiFi environment, or travel in a WiFi-enabled aircraft you are being exposed to levels that have been shown to cause damage to DNA, leakage of the blood-brain barrier, cognitive impairment, cardiac systems …

In case you want to know more and see some of the evidence, see www.SaferTechSolutions.org

- Kerry Crofton
A4M commentator on Electro-magnetic Radiation