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- W2104910696 abstract "Oncogenic mutations of the MLL histone methyltransferase confer an unusual ability to transform non-self-renewing myeloid progenitors into leukemia stem cells (LSCs) by mechanisms that remain poorly defined. Misregulation of Hox genes is likely to be critical for LSC induction and maintenance but alone it does not recapitulate the phenotype and biology of MLL leukemias, which are clinically heterogeneous--presumably reflecting differences in LSC biology and/or frequency. TALE (three-amino-acid loop extension) class homeodomain proteins of the Pbx and Meis families are also misexpressed in this context, and we thus employed knockout, knockdown, and dominant-negative genetic techniques to investigate the requirements and contributions of these factors in MLL oncoprotein-induced acute myeloid leukemia. Our studies show that induction and maintenance of MLL transformation requires Meis1 and is codependent on the redundant contributions of Pbx2 and Pbx3. Meis1 in particular serves a major role in establishing LSC potential, and determines LSC frequency by quantitatively regulating the extent of self-renewal, differentiation arrest, and cycling, as well as the rate of in vivo LSC generation from myeloid progenitors. Thus, TALE proteins are critical downstream effectors within an essential homeoprotein network that serves a rate-limiting regulatory role in MLL leukemogenesis." @default.
- W2104910696 created "2016-06-24" @default.
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- W2104910696 date "2007-10-17" @default.
- W2104910696 modified "2023-10-12" @default.
- W2104910696 title "<i>Meis1</i> is an essential and rate-limiting regulator of <i>MLL</i> leukemia stem cell potential" @default.
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- W2104910696 doi "https://doi.org/10.1101/gad.1602107" @default.
- W2104910696 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/2045130" @default.
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