Section: Research

Postdoctoral Position Available

Lucio Castilla, Ph.D.

Academic Role: Assistant Professor

Faculty Appointment(s) In:
   Program in Gene Function and Expression
   Program in Molecular Medicine

Other Affiliation(s):
   Center for AIDS Research
   Graduate Program in Cancer Biology
   Interdisciplinary Graduate Program

Genetics of Leukemia, Mouse Models

The goal of our laboratory is to understand the molecular mechanisms of leukemia development. Leukemia arises from the abnormal expansion of hematopoietic stem cells that have acquired multiple genetic alterations that block differentiation programs and provide proliferation and survival capacity. The dimeric transcription factor “core-binding-factor” (CBF) is a master regulator of gene expression during development and differentiation. Genetic alterations in either CBF subunit, RUNX1 or CBFß, have been associated with human leukemia. For example, acute myeloid leukemia (AML) samples with chromosome 16 inversion express the fusion gene CBFB-MYH11. We and others have shown that Cbfb-MYH11 expression hinders multi-lineage differentiation. We have recently used a conditional Cbfb-MYH11 knock-in mouse model to show that the fusion gene also creates an abnormal myeloid progenitor that progress to AML upon the accumulation of cooperating mutations that provide proliferation and/or survival advantage (see Figure).

One line of our research uses conditional knock-in and knock-out strategies to better understand the role of CBF factors in hematopoietic stem cells and the alterations induced by Cbfb-MYH11 expression in this compartment as well as during multi-lineage differentiation.   Second, we are characterizing the contribution of other de-regulated genes that collaborate with Cbfb-MYH11 in leukemogenesis. We use retroviral insertional mutagenesis in mice expressing Cbfb-MYH11 to identify candidate cooperating genes. We are particularly interested on one of these factors, the pleomorphic adenoma like-2 gene (PlagL2), and are studying its role in normal and malignant hematopoiesis. Third, the leukemic cells are a heterogeneous group of cells at different stages of differentiation. Few of these cells, called leukemia-initiating cells, hold the capacity to expand indefinitely and recreate the disease. We focus part of our efforts on characterizing the CBF leukemia-initiating cells, with the goal of identifying small molecules that inhibit Cbfb-MYH11 function and may be used in the design of improved therapy.

Office: LRB 622
Phone: 508-856-3281
E-mail: Lucio.Castilla@umassmed.edu
Keywords: Oncogenes/tumor suppressors, Cancer, Mouse Models, Mutagenesis, Gene Regulation

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Postdoctoral Position Available A postdoctoral position is available to study in this laboratory. Contact Dr. Castilla for additional details.