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Gene mutation found for aggressive form of pancreatic cancer

Date:
May 25, 2014
Source:
University of California, San Diego Health Sciences
Summary:
A mutated gene common to adenosquamous carcinoma (ASC) tumors has been discovered by researchers -– the first known unique molecular signature for this rare, but particularly virulent, form of pancreatic cancer. Pancreatic cancer is the fourth leading cause of cancer-related death in the United States, with roughly 45,220 new cases diagnosed and more than 38,400 deaths annually. Both numbers are rising. ASC cases are infrequent, but typically have a worse prognosis than more common types of pancreatic cancer.

Researchers at the University of California, San Diego School of Medicine have identified a mutated gene common to adenosquamous carcinoma (ASC) tumors -- the first known unique molecular signature for this rare, but particularly virulent, form of pancreatic cancer.

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The findings are published in the May 25 advance online issue of Nature Medicine.

Pancreatic cancer is the fourth leading cause of cancer-related death in the United States, with roughly 45,220 new cases diagnosed and more than 38,400 deaths annually. Both numbers are rising. ASC cases are infrequent, but typically have a worse prognosis than more common types of pancreatic cancer.

"There has been little progress in understanding pancreatic ASC since these aggressive tumors were first described more than a century ago," said co-senior author Miles F. Wilkinson, PhD, professor in the Department of Reproductive Medicine and a member of the UC San Diego Institute for Genomic Medicine. "One problem has been identifying mutations unique to this class of tumors."

In their paper, Wilkinson, co-senior author Yanjun Lu, PhD, of Tongji University in China, and colleagues report that ASC pancreatic tumors have somatic or non-heritable mutations in the UPF1 gene, which is involved in a highly conserved RNA degradation pathway called nonsense-mediated RNA decay or NMD. It is the first known example of genetic alterations in an NMD gene in human tumors.

NMD has two major roles. First, it is a quality control mechanism used by cells to eliminate faulty messenger RNA (mRNA) -- molecules that help transcribe genetic information into the construction of proteins essential to life. Second, it degrades a specific group of normal mRNAs, including those encoding proteins promoting cell growth, cell migration and cell survival. Loss of NMD in these tumors may "release the brakes on these molecules, and thereby driving tumor growth and spread," said Wilkinson.


Story Source:

The above story is based on materials provided by University of California, San Diego Health Sciences. The original article was written by Scott LaFee. Note: Materials may be edited for content and length.


Journal Reference:

  1. Chen Liu, Rachid Karam, YingQi Zhou, Fang Su, Yuan Ji, Gang Li, GuoTong Xu, LiXia Lu, ChongRen Wang, MeiYi Song, JingPing Zhu, YiRan Wang, YiFan Zhao, Wai Chin Foo, MingXin Zuo, Mark A Valasek, Milind Javle, Miles F Wilkinson, YanJun Lu. The UPF1 RNA surveillance gene is commonly mutated in pancreatic adenosquamous carcinoma. Nature Medicine, 2014; DOI: 10.1038/nm.3548

Cite This Page:

University of California, San Diego Health Sciences. "Gene mutation found for aggressive form of pancreatic cancer." ScienceDaily. ScienceDaily, 25 May 2014. <www.sciencedaily.com/releases/2014/05/140525154720.htm>.
University of California, San Diego Health Sciences. (2014, May 25). Gene mutation found for aggressive form of pancreatic cancer. ScienceDaily. Retrieved October 24, 2014 from www.sciencedaily.com/releases/2014/05/140525154720.htm
University of California, San Diego Health Sciences. "Gene mutation found for aggressive form of pancreatic cancer." ScienceDaily. www.sciencedaily.com/releases/2014/05/140525154720.htm (accessed October 24, 2014).

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