Date of Award


Publication Type

Master Thesis

Degree Name



Biological Sciences

First Advisor

Lisa A. Porter


Molecular biology, Cellular biology, Oncology



Creative Commons License

Creative Commons Attribution-Noncommercial-No Derivative Works 4.0 License
This work is licensed under a Creative Commons Attribution-Noncommercial-No Derivative Works 4.0 License.


In blood malignancies, the balance of hematopoietic stem cell (HSC) self-renewal and differentiation is disturbed such that HSCs produce abnormal cells with an increased capacity to proliferate; however, the exact causes of this imbalance are not known. SpeedyA1 (Spy1) is a positive cell cycle regulator known to enhance cellular proliferation by direct binding and activation of Cyclin-dependent kinase (Cdk) Cdk2 and by promoting degradation of the Cdk inhibitor (CKI) p27 Kip1 . I demonstrate that Spy1 expression levels are elevated in early stem and progenitor cells during hematopoiesis, but that Spy1 may also be implicated in later stages of myeloid differentiation. Spy1 protein was elevated in human bone marrow tumour samples and Spy1 knock-down in HL-60 cells led to decreased cell growth as well as expression of leukemic stem cell (LSC) markers. Together, these findings demonstrate a potential role for Spy1 in regulating HSC fate and in the development of blood malignancies.