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Patterns of chromosome abnormality: The key to cancer?
Date:1/23/2012

A healthy genome is characterized by 23 pairs of chromosomes, and even a small change in this structure such as an extra copy of a single chromosome can lead to severe physical impairment. So it's no surprise that when it comes to cancer, chromosomal structure is frequently a contributing factor, says Prof. Ron Shamir of the Blavatnik School of Computer Science at Tel Aviv University.

Now Prof. Shamir and his former doctoral students Michal Ozery-Flato and Chaim Linhart, along with fellow researchers Prof. Shai Izraeli and Dr. Luba Trakhtenbrot from the Sheba Medical Center, have combined techniques from computer science and statistics to discover that many chromosomal pairs are lost or gained together across various cancer types. Moreover, the researchers discovered a new commonality of chromosomal aberrations among embryonic cancer types, such as kidney, skeleton, and liver cancers.

These findings, recently published in Genome Biology, could reveal more about the nature of cancer. As cancer develops, the genome becomes increasingly mutated and identifying the pattern of mutation can help us to understand the nature and the progression of many different kinds of cancer, says Prof. Shamir.

Looking at the big picture

As cancer progresses, the structure of chromosomes is rearranged, individual chromosomes are duplicated or lost, and the genome becomes abnormal. Some forms of cancer can even be diagnosed by identifying individual chromosomal aberrations, notes Prof. Shamir, pointing to the example of a specific type of leukemia that is caused by small piece of chromosome 9 being moved to chromosome 22.

When analyzing many different kinds of cancer, however, the researchers discovered that chromosomal aberrations among different cancers happen together in a noticeable and significant way. The researchers studied a collection of more than fifty thousand cancer karyotypes representations of chromos
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Contact: George Hunka
ghunka@aftau.org
212-742-9070
American Friends of Tel Aviv University
Source:Eurekalert  

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