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Researchers Present Comprehensive "Roadmap" of Blood Cells

Robust genetic catalog will allow better comparison of normal cells, cancer cells

WASHINGTON, March 26, 2014 /PRNewswire-USNewswire/ -- Research published online today in Blood, the journal of the American Society of Hematology, presents an unprecedented look at five unique blood cells in the human body, pinpointing the location of key genetic regulators in these cells and providing a new tool that may help scientists to identify how blood cells form and shed light on the etiology of blood diseases.

Work published today in Blood* is a subset of a much larger catalog of genetic information about nearly 1,000 human cells and tissues unveiled today from the international research consortium "Functional Annotation of the Mamaliam Genome" (FANTOM, with this latest installment referred to as FANTOM5). Two flagship manuscripts describing pivotal observations from the expansive genome mapping project were also published online today in Nature; companion work is also being published today in BMC Genomics.

Blood comprises three main types of cells, erythrocytes (red blood cells), leukocytes (white blood cells), and thrombocytes (platelets), all of which arise from blood stem cells. While the origin of these cells is known, the gene expression changes that take place in the stem cell to dictate whether it becomes red cell, white cell, or platelet – or even develops a genetic mutation – are not yet fully understood.

To provide insight into this process, investigators analyzed more than 30 different specialized subtypes of white blood cells (including mast cells, T cells, monocytes, granulocytes, and B cells) and pinpointed the locations of key regions known as enhancers and promoters that determine if a particular gene will be active or silent in a cell. By identifying and mapping the locations of these regulators, investigators were able to correlate them with activity in specific genes.

"Until this point researchers could only recognize the unique signatures of enhancers and promoters; however, their exact location, as well as the association of specific enhancers to specific blood cells, remained unclear," said FANTOM5 Principal Investigator Alistair Forrest, PhD, of the RIKEN Centre for Life Science Technology in Yokohama,  Japan. "This new, publicly available resource changes that, providing hematologists with a baseline reference for most blood cell types that allows them to trace the development of these cells and determine what may have occurred along the way to lead them to their final state."

With this new understanding of the location of enhancers and promoters used in each blood cell, investigators will now be better equipped to design experiments to determine how genes become activated, which could potentially lead to the development of strategies for turning off the gene to prevent or treat malignancies.

"The specific genetic alterations that are responsible for a normal cell turning into a cancer cell show up in the levels of messenger RNA in the cell, and these differences are often very subtle," said Dr. Forrest. "Now that we have these incredibly detailed pictures of each of these cell types, we can now work backwards to compare cancer cells to the cells they came from originally to better understand what may have triggered the cells to malfunction, so we will be better equipped to develop new and more effective therapies."

*Studies referenced in this release include:

Blood (www.bloodjournal.org), the most cited peer-reviewed publication in the field of hematology, is available weekly in print and online. Blood is the official journal of the American Society of Hematology (ASH) (www.hematology.org), the world's largest professional society concerned with the causes and treatment of blood disorders.

ASH's mission is to further the understanding, diagnosis, treatment, and prevention of disorders affecting blood, bone marrow, and the immunologic, hemostatic, and vascular systems by promoting research, clinical care, education, training, and advocacy in hematology.

blood® is a registered trademark of the American Society of Hematology.

SOURCE American Society of Hematology

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