Roche NimbleGen CGH Arrays Facilitate Novel Cross-Species Study on Colorectal Cancer (CRC) in Humans and Canines

(PresseBox) (Madison, WI, USA, ) In a recently published study in the journal Genome Research, a team of scientists led by Dr. Shaying Zhao at the University of Georgia have developed a novel crossspecies comparative genomics and oncology strategy for cancer driver gene discovery, using microarray technologies from Roche NimbleGen (SIX: RO, ROG; OTCQX: RHHBY), that differs fundamentally from current approaches which focus on human cancers only. This study used NimbleGen CGH arrays to pinpoint genes likely responsible for colorectal cancer (CRC) by identifying genomic copy number abnormalities (CNAs) that are common in both canine and human CRC research samples (Genome Research, 2010, 20:341). The results of this study could have significant implications on research to develop future diagnostic assays and treatments for this devastating disease.

Colorectal cancer is one of the most common cancers affecting humans globally. The National Cancer Institute recently reported CRC as the third most commonly diagnosed cancer in addition to being the third leading cause of cancerrelated deaths in the United States (Cancer, 2010, 116:544). While early screening and risk factor modification is contributing to the downward trend of mortality rate for this disease, significant research is still needed to identify the genomic cause of this cancer.

In recent years, increasing evidence for the contribution of CNAs to cancer development and progression has been reported. CNAs are most easily detected using microarraybased comparative genomic hybridization (CGH), where entire genomes of healthy and cancer samples are compared in a single experiment. As these changes can be numerous and complex in certain cancers, especially those from advanced stage cancers, it is challenging to determine which CNAs are cancercausing and which are noncausative changes.

To test the hypothesis that CNAs common in both human and dog CRC are more likely to be the direct cause of CRC, Dr. Zhao's team used NimbleGen CGH microarrays to first characterize CNAs in human CRC and canine CRC samples. "For this study, we selected the high density 385K and 2.1 million CGH arrays from Roche NimbleGen as our platform of choice to identify copy number abnormalities in sporadic canine and human colorectal cancer (CRC) genomes, as they provide comprehensive detection of known and novel CNAs," said Dr. Zhao. "The results have revealed for the first time a strong degree of genetic homology between sporadic canine and human CRC. The study provides the molecular evidence supporting that sporadic canine cancers are excellent models for the corresponding human cancers, and that comparison between dog and human cancers of similar types would be a powerful way to identify driver alterations. "

"Supporting scientific progress through innovative microarray technologies is an important goal at Roche NimbleGen" said Dr. Andreas Goertz, Vice President of Marketing. "We collaborate with leading research scientists such as Dr. Zhao and her team to provide cutting edge methods such as sensitive and accurate CGH analysis on human and model organisms with our robust and comprehensive CGH microarray platform."

For more information on NimbleGen CGH arrays, visit www.nimblegen.com

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