NEW YORK (March 25, 2008) -- Like the subtext of a novel, the human genome sequence harbors more information than appears just in its "letters" of A, C, T and G. Since DNA is a data-packed molecule passed from generation to generation, comparing genome sequences among individuals also holds clues to ancestry.
So-called association studies that match unusual DNA sequence variations to diseases are very common nowadays. But a multi-institution group led by Dr. Francis Barany, professor of microbiology and immunology at Weill Cornell Medical College, has instead zeroed in on parts of the genome that are strikingly similar among people from a particular population group who have the same type of cancer. This "autozygosity" (identical copies of DNA inherited from both parents) might serve not only as a way to predict susceptibility to cancer in some people, but may lead researchers to novel cancer-causing genes. More broadly, the work suggests a new type of genetic signpost that clinicians might follow for a range of cancers, in many population groups.
In a paper "The Signatures of Autozygosity Among Patients with Colorectal Cancer," to be published online on March 28, and in print on April 15, in the journal Cancer Research, Dr. Barany and his colleagues report Identity by Descent (IBD) segments that are the same in sequence (autozygous) among individuals who have colorectal cancer. About half the cases are of Jewish heritage. The simplest explanation for their IBD segments is that they were inherited from a long-ago, shared ancestor. The investigators compared IBD regions among 74 colorectal cancer patients to two control groups, and found the segments to be twice as numerous and longer among the cancer patients.
Tellingly, the identical DNA stretches were more common among Jewish cancer patients. Scientifically, the power of this new approach derives from the common practice wherein individuals marry within the same ethnic or social background, known as "endogamy." (This custom carries no social stigma; on the contrary, it is a source of pride in most cultures.) Since the other half of patients with IBD are of Catholic or Protestant heritage, the results of such an analysis pertain to all populations. The IBD regions reveal where researchers should look for novel genes, which contribute to the overall risk for this cancer.
Colorectal cancer results in more than 52,000 deaths each year in the United States, with more than 153,000 new cases diagnosed. About a third of cases run in families, and some of them are caused by a handful of well-studied genes. The genetic underpinnings of most of the more than a million cases of colorectal cancer worldwide are not known. This new approach of following IBD regions may clear up some of that mystery -- and ultimately, many others.
The study was supported by a grant from the National Cancer Institute, and was a collaborative effort between scientists/physicians from Weill Cornell Medical College, Memorial Sloan-Kettering Cancer Center, Princeton University, The University of Medicine and Dentistry of New Jersey, Columbia University, The Rockefeller University, Yale University, Boston University and the National Cancer Institute.
Weill Cornell Medical College
Weill Cornell Medical College, Cornell University's medical school located in New York City, is committed to excellence in research, teaching, patient care and the advancement of the art and science of medicine, locally, nationally and globally. Weill Cornell, which is a principal academic affiliate of NewYork-Presbyterian Hospital, offers an innovative curriculum that integrates the teaching of basic and clinical sciences, problem-based learning, office-based preceptorships, and primary care and doctoring courses. Physicians and scientists of Weill Cornell Medical College are engaged in cutting-edge research in areas such as stem cells, genetics and gene therapy, geriatrics, neuroscience, structural biology, cardiovascular medicine, transplantation medicine, infectious disease, obesity, cancer, psychiatry and public health -- and continue to delve ever deeper into the molecular basis of disease in an effort to unlock the mysteries of the human body in health and sickness. In its commitment to global health and education, the Medical College has a strong presence in places such as Qatar, Tanzania, Haiti, Brazil, Austria and Turkey. Through the historic Weill Cornell Medical College in Qatar, the Medical College is the first in the U.S. to offer its M.D. degree overseas. Weill Cornell is the birthplace of many medical advances -- including the development of the Pap test for cervical cancer, the synthesis of penicillin, the first successful embryo-biopsy pregnancy and birth in the U.S., the first clinical trial of gene therapy for Parkinson's disease, the first indication of bone marrow's critical role in tumor growth, and most recently, the world's first successful use of deep brain stimulation to treat a minimally-conscious brain-injured patient. For more information, visit www.med.cornell.edu.