This book will contain a series of review articles that focus on retroviral models of human and animal cancers. Each article will be written by an expert in the field of retrovirology. The reviews will summarize current work on a particular retrovirus, with particular emphasis on the relevance of this research to human disease.

Ovine pulmonary adenocarcinoma (OPA) is a contagious lung cancer of sheep, first reported in South Africa in 1832 as "jaagsiekte" (chasing sickness). Starting in the 1970s evidence began to accumulate that the etiologic agent of OPA is a retrovirus, culminating in the deduction of the sequence of a novel retrovirus associated with the disease, jaagsiekte sheep retrovirus (JSRV). Very recently, substantial progress has been made in JSRV research, including isolation of infectious and oncogenic molecular clones of JSRV, identification and cloning of the JSRV receptor, and demonstration that the envelope gene of JSRV functions as an oncogene. This book is a consensus volume that comprehensively reviews all aspects of JSRV research, including natural history of the disease, histopathology of OPA, molecular biology of JSRV, oncogenic transformation by JSRV, and comparison with human lung cancer.

For over 25 years the study of retroviruses has underpinned much of what is known about information transfer in cells and the genetic and biochemical mechanisms that underlie cell growth and cancer induction. Emergent diseases such as AIDS and adult T-cell lymphoma have widened even further the community of investigators directly concerned with retroviruses, a development that has highlighted the need for an integrated understanding of their biology and their unique association with host genomes. This remarkable volume satisfies that need. Written by a group of the field's most distinguished investigators, rigorously edited to provide a seamless narrative, and elegantly designed for clarity and readability, this book is an instant classic that demands attention from scientists and physicians studying retroviruses and the disorders in which they play a role.

Approximately eight percent of our DNA contains retroviral sequences that are millions of years old. Through engaging stories of scientific discovery, Anna Marie Skalka explains our evolving knowledge of these ancient denizens of the biosphere and how this understanding has significantly advanced research in genetic engineering, gene delivery systems, and precision medicine. Discovering Retroviruses begins with the pioneer scientists who first encountered these RNA-containing viruses and solved the mystery of their reproduction. Like other viruses, retroviruses invade the cells of a host organism to reproduce. What makes them “retro” is a unique process of genetic information transfer. Instead of transcribing DNA into RNA as all living cells do, they transcribe their RNA into DNA. This viral DNA is then spliced into the host’s genome, where the cell’s synthetic machinery is co-opted to make new virus particles. The 100,000 pieces of retroviral DNA in the human genome are remnants from multiple invasions of our ancestors’ “germline” cells—the cells that allow a host organism to reproduce. Most of these bits of retroviral DNA are degenerated fossils, but some have been exploited during evolution, with profound effects on our physiology. Some present-day circulating retroviruses cause cancers in humans and other animals. Others, like HIV, cause severe immunodeficiencies. But retroviruses also hold clues to innovative approaches that can prevent and treat these diseases. In laboratories around the world, retroviruses continue to shed light on future possibilities that are anything but “retro.”

Leading scientists in the field review the genomics, molecular biology and pathogenesis of these important viruses, comprehensively covering all the recent advances.

Methods included in this volume apply to the expression and characterization of retroviral proteases and their inhibitor/substrate design.

Is cancer a contagious disease? In the late nineteenth century this idea, and attending efforts to identify a cancer “germ,” inspired fear and ignited controversy. Yet speculation that cancer might be contagious also contained a kernel of hope that the strategies used against infectious diseases, especially vaccination, might be able to subdue this dread disease. Today, nearly one in six cancers are thought to have an infectious cause, but the path to that understanding was twisting and turbulent. ​ A Contagious Cause is the first book to trace the century-long hunt for a human cancer virus in America, an effort whose scale exceeded that of the Human Genome Project. The government’s campaign merged the worlds of molecular biology, public health, and military planning in the name of translating laboratory discoveries into useful medical therapies. However, its expansion into biomedical research sparked fierce conflict. Many biologists dismissed the suggestion that research should be planned and the idea of curing cancer by a vaccine or any other means as unrealistic, if not dangerous. Although the American hunt was ultimately fruitless, this effort nonetheless profoundly shaped our understanding of life at its most fundamental levels. A Contagious Cause links laboratory and legislature as has rarely been done before, creating a new chapter in the histories of science and American politics.