Timothy J. Ley, M.D.

Tim Ley
  • Professor
    • Department of Medicine
      • Oncology Division
        • Stem Cell Biology Section
    • Department of Genetics
  • Research interests
    • Mouse models of acute myeloid leukemias
    • Cancer genomics

Research

The lab focuses on the genetics and genomics of acute myeloid leukemia (AML). Several versions of a mouse model of acute promyelocytic leukemia have been created, which recapitulate most features of the human disease. These mice are being used as a platform to identify mutations that cooperate with PML-RARA, the fusion protein that is the consequence of the 15;17 translocation that is uniquely associated with this disease. The lab is studying human AML with a variety of genomic platforms in a long-term collaboration with the Genome Institute at Washington University. A variety of array based genomic studies have been used to identify copy number alterations in AML genomes, and expression signatures for several AML subtypes. In addition, whole genome sequencing has been initiated for a large number of AML samples with normal cytogenetics, or with the 15;17 translocation. We are attempting to identify recurring mutations that could potentially be used to better stratify patients with intermediate risk cytogenetics, so that more appropriate treatment intensity approaches can be used for these patients. A number of new, recurring mutations have now been identified, including mutations in the IDH1 and IDH2 genes, which appear to predict outcomes. We are also sequencing the genomes of the murine APL tumors from the models generated in the lab; in the first genome sequenced, we found recurring somatic mutations that are also detected in human AML patients, verifying the idea that progression mutations may be conserved. Integrated genomic approaches are being used to link changes in the genome, transcriptome, and methylome to the phenotypes and outcomes of AML patients, to identify new prognostic tests, and potential targets for therapy.

Evolution of AML

Model for evolution of genetic changes in acute myeloid leukemia

A hypothetical model in which nonpathogenic somatic mutations (1–3) acquired over the lifespan of a stem cell are propagated in the malignant clone after it acquires a critical initiating mutation (4). Mutation 5 is a progression mutation that cooperates with the AML-initiating mutation 4 to contribute to AML development. Other mutations (represented by 6 and 7) do not cooperate with the AML-initiating mutation 4, and do not contribute to AML development. These subclones are lost, or fail to expand to the limit of detection by sequencing studies.
AML: Acute myeloid leukemia; HSC: Hematopoietic stem cell.

From: Walter MJ, Graubert TA, DiPersio JF, Mardis ER, Wilson RK, Ley TJ
Next-generation sequencing of cancer genomes: back to the future.
Per Med 2009 Nov 1;6(6):653

Biographical Sketch

Education

1974 B.A., Drake University, Des Moines, IA
1978 M.D., Washington University School of Medicine, St. Louis, MO

Post-graduate Training

1978-1979 Intern in Medicine, Massachusetts General Hospital, Boston, MA
1979-1980 Assistant Resident in Medicine, Massachusetts General Hospital, Boston, MA
1980-1983 Clinical Associate, National Heart, Lung, and Blood Institute, National Institutes of Health, Bethesda, MD
1983-1984 Hematology-Oncology Fellow, Washington University Medical Center, St. Louis, MO

Academic Positions & Employment

1984-1986 Senior Investigator, National Heart, Lung, and Blood Institute, National Institutes of Health, Bethesda, MD
1986-1990 Assistant Professor of Medicine, Washington University School of Medicine, St. Louis, MO
1986-1993 Assistant Professor of Genetics, Washington University School of Medicine, St. Louis, MO
1990-1993 Associate Professor of Medicine, Washington University School of Medicine, St. Louis, MO
1993-present Professor of Medicine, Washington University School of Medicine, St. Louis, MO
1993-present Professor of Genetics, Washington University School of Medicine, St. Louis, MO
1994-2000 Director, Hematopoiesis Research Center, Washington University School of Medicine, St. Louis, MO
2000-present Director, Section of Stem Cell Biology, Division of Oncology, Washington University School of Medicine, St. Louis, MO
2000-2008 Associate Director for Basic Science, Alvin J. Siteman Cancer Center, Washington University, St. Louis, MO
2008-present Associate Director for Cancer Genomics, The Genome Institute, Washington University, St. Louis, MO

Board Certification

1981 Internal Medicine
1984 Hematology

Professional Societies

  Alpha Omega Alpha
  American Society of Hematology
  American Association for the Advancement of Science
  American Society for Biochemistry and Molecular Biology
  American Society for Clinical Investigation
  Association of American Physicians

Honors & Awards

1974 Phi Beta Kappa, Drake University, Des Moines, IA
1974 Ross Award for Promise of Success in Medicine, Drake University
1974 Phi Eta Sigma Award (Best Academic Record), Drake University
1975 E.V. Cowdry Prize in Histology, Washington University, St. Louis, MO
1976 Robert Carter Medical School Prize, Washington University, St. Louis, MO
1978 Alpha Omega Alpha
1978 St. Louis Internists Club Book Prize (For Achievement in Medicine), Washington University, St. Louis, MO
1978 Medical Fund Society Prize in Surgery, Washington University, St. Louis, MO
1978 Alpha Omega Alpha Book Prize (Best Academic Record), Washington University, St. Louis, MO
1986-1988 Basil O'Conner Scholar, March of Dimes Foundation
1990 American Society for Clinical Investigation
1994 Teacher of the Year, Dept. of Medicine, Jewish Hospital
1995 Association of American Physicians
1998 Alumni-Faculty Award, Washington University Medical School
1999 Alan A. & Edith L. Wolff Professorship in Medicine
1999 MERIT Award, National Institutes of Health
2000 ASCI Special Service Award
2000 Internal Medicine Leadership Award in Scientific Investigation, Washington University Medical School
2001 St. Louis Spirit of Health Award, American Cancer Society
2001 Excellence in Teaching and Mentoring, Markey Special Emphasis Pathway, Washington University Medical School
2002 Fellow of AAAS (American Association for the Advancement of Science)
2003 Institute of Medicine, National Academy of Sciences
2005 Herman Beerman Award, Society of Investigative Dermatology
2006 America’s Top Physicians, Consumers’ Research Council of America
2007 Fellow, St. Louis Academy of Science
2007-2011 Association of American Physicians Council (Treasurer 2008-2011)
2007 Best Doctors in America
2008 Distinguished Educator Award for Postdoctoral Mentoring, Washington University Medical School
2008 American Society of Hematology Mentor Award
2009 Lewis T. and Rosalind B. Apple Chair in Oncology
2009-2012 Who’s Who in America
2010 American Academy of Arts and Sciences
2010 Alumni Achievement Award, Drake University
2011 2nd Century Award, Washington University
2012 Interdisciplinary/Collaborative Science Award, St. Louis Academy of Science

National Leadership Positions, Societies, & Boards

1990-1991 Chairman, Committee on Scientific Affairs, American Society of Hematology
1992-present Cooley’s Anemia Foundation Medical Advisory Board
1992-1996 Hematology I Study Section, ad hoc member
1997-1998 President, American Society for Clinical Investigation
1998-2001 FASEB Board of Directors
2004-2005 General Motors Foundation, Awards Committee
2004-2007 American Society of Hematology, Awards Committee
2007-2011 Association of American Physicians Council
2007-present International Cancer Genomics Consortium Scientific Planning Committee
2008-2012 Treasurer, Association of American Physicians
2008-2012 NHGRI Board of Scientific Counselors (2009 - Chair)

Editorial Boards

1990-1996
1998-2003
Blood
1995-1998 Clinical Molecular Pathology
1998-2003 Journal of Clinical Investigation