Johns Hopkins scientists have deciphered the genetic code of a type, called islet cell or neuroendocrine tumors. The work described in the January 20 online in Science Express, showed that patients with cancer codes certain errors live two times longer than those without them.The team at Johns Hopkins, already mapped to six other types of cancer, have used automated tools to create a sort of map that provides guidance on how tumors develop, grow and spread.
Two other commonly mutated genes, ATRX and Daxx, which had not been linked to cancer, also have epigenetic effects on DNA is read.6 % respectively. The proteins produced by these two genes interact with specific portions of DNA to change the way you read the chemical letters.
Co-authors include Yuchen Jiao Shi Chanjuan, Barish Edil, Roeland de Wilde, David Klimstra, Anirban Maitra, Richard Schulick, Laura Tang, Christopher Wolfgang, Michael Chota, Victor Velculescu, Luis Diaz Jr., and Bert Vogelstein of Johns Hopkins.
To effectively detect and eliminate cancer, may be important to develop new diagnostics and therapies that aim to make both genetic and epigenetic processes, says Kenneth Kinzler, Ph.D., professor of oncology at the Johns Hopkins Kimmel Cancer Center and co-director of the Ludwig Center at Johns Hopkins.
In the first series of experiments, scientists at Johns Hopkins in sequence almost all protein-coding genes in 10 of 68 samples of pancreatic neuroendocrine tumors and compared these sequences with the normal DNA of each patient to identify specific changes in the tumor or mutations.
Pancreatic neuroendocrine tumors represent about five % of all cancers of the pancreas. Some of these tumors produce hormones that have significant effects on the body, including changes in blood sugar, weight gain, and rash, while others have no hormones, such as signal .
However, tumors grow silently without hormones in the pancreas, and many are difficult to distinguish from other types of pancreatic cancer, says Ralph Hruban, MD, professor of pathology and oncology and director of the Sol Goldman Center for Pancreatic Cancer Research at Johns Hopkins.
The most frequent mutation in MEN-1 gene occurred in more than 44 % of all cancers 68. MEN-1, which has already been linked to many cancers, the creation of proteins that regulate the duration of DNA strands are twisted and formed dense bundles that open and close depending on when the genes must be activated. This process is regulated by proteins and chemicals that act outside of genes, called epigenetics by scientists.
The Johns Hopkins team also found that 14 % of the samples studied contained mutations in a gene family called mTOR, which regulates the processes of cell signaling. Papadopoulos said that patients with tumors containing such changes in the way of mTOR could be candidates for treatment with mTOR inhibitors.
Significant funding for the study were provided by the Caring for Carcinoid Foundation, a non-profit foundation that finances research on cancer, carcinoid, pancreatic cancer, neuroendocrine tumors and neuroendocrine-related. Additional funding was from the Lustgarten Foundation for Pancreatic Cancer Research, the Sol Goldman Pancreatic Cancer Research Center, Joseph Rabinowitz?s Fund for pancreatic cancer, the Virginia and DK Ludwig Fund for Cancer Research, the Raymond and Beverly Sackler Research Foundation, AACR Grant Stand Up to Cancer Research Translational Cancer Dream Team and the National Institutes of Health.
In the code are chemical compounds called nucleotides, which pair together in a pre-programmed for construction of DNA and, in turn, a genome. The combinations of these genes form letters, nucleotides that provide the instructions that drive cellular activity. The changes of pairs of nucleotides, called mutations, can create coding errors that transform a normal cell becomes cancerous.
Papadopoulos, Kinzler and co-author Bert Vogelstein, Luis Diaz, Victor Velculescu and co-founders and members of the Scientific Council Inostics, a company that develops technologies for the molecular diagnosis of cancer. Inostics own shares, which is subject to certain restrictions under the conflict of interest policy at Johns Hopkins.
Kinzler, Vogelstein and Velculescu are entitled to share royalties collected by the University on sales of products related to the genes described in this manuscript.
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