Short telomere telomere: A telomere is the end of a chromosome. Telomeres are made of repetitive sequences of non-coding DNA that protect the chromosome from damage. Each time a cell divides, the telomeres become shorter. EVvntually, the telomeres become so short that the cell can no longer divide. syndrome is a genetic mutation mutation: Any change or alteration in a gene. A mutation may cause disease or may be a normal variation. Paroxysmal nocturnal hemoglobinuria (PNH) occurs because of a mutation in the PIG-A gene of a single stem cell in the bone marrow. that has significant implications for MDS and AML patients. This webinar provides an overview of the subject and will address the specific impact for bone marrow failure bone marrow failure: A condition that occurs when the bone marrow stops making enough healthy blood cells. The most common of these rare diseases are aplastic anemia, myelodysplastic syndromes (MDS) and paroxysmal nocturnal hemoglobinuria (PNH). Bone marrow failure can be acquired (begin any time in life) or can be… disease patients. Our speaker, Mary Armanios, M.D., is the Clinical Director of the Telomere Center at Johns Hopkins, Associate Director of Cancer Research Career Enhancement, Sidney Kimmel Comprehensive Cancer Center, Professor of Oncology, Genetic Medicine, Molecular Biology and Genetics, and Pathology as well as an active researcher. Dr. Armanios focuses her research on disorders caused by telomere dysfunction and specific to this webinar, the implications for patients with MDS and AML.