• Register
X
Forgot Password

If you have forgotten your password you can enter your email here and get a temporary password sent to your email.

X

Leaving Community

Are you sure you want to leave this community? Leaving the community will revoke any permissions you have been granted in this community.

No
Yes

An evolutionarily conserved PTEN-C/EBPalpha-CTNNA1 axis controls myeloid development and transformation.

Loss of function of tumor suppressor genes, such as PTEN, CEBPAlpha, and CTNNA1 (encoding the alpha-catenin protein), has been found to play an essential role in leukemogenesis. However, whether these genes genetically interact remains largely unknown. Here, we show that PTEN-mammalian target of rapamycin signaling acts upstream to dictate the ratio of wild-type p42 C/EBPalpha to its dominant-negative p30 isoform, which critically determines whether p30 C/EBPalpha (lower p42/p30 ratio) or p42 C/EBPalpha (higher p42/p30 ratio) binds to the proximal promoter of the retained CTNNA1 allele. Binding of p30 C/EBPalpha recruits the polycomb repressive complex 2 to suppress CTNNA1 transcription through repressive H3K27me3 modification, whereas binding of p42 C/EBPalpha relieves this repression and promotes CTNNA1 expression through activating H3K4me3 modification. Loss of Pten function in mice and zebrafish induces myelodysplasia with abnormal invasiveness of myeloid progenitors accompanied by significant reductions in both wild-type C/EBPalpha and alpha-catenin protein. Importantly, frame-shift mutations in either PTEN or CEBPA were detected exclusively in the primary LICs with low CTNNA1 expression. This study uncovers a novel molecular pathway, PTEN-C/EBPalpha-CTNNA1, which is evolutionarily conserved and might be therapeutically targeted to eradicate LICs with low CTNNA1 expression.

Pubmed ID: 20371743

Authors

  • Fu CT
  • Zhu KY
  • Mi JQ
  • Liu YF
  • Murray ST
  • Fu YF
  • Ren CG
  • Dong ZW
  • Liu YJ
  • Dong M
  • Jin Y
  • Chen Y
  • Deng M
  • Zhang W
  • Chen B
  • Breslin P
  • Chen SJ
  • Chen Z
  • Becker MW
  • Zhu J
  • Zhang JW
  • Liu TX

Journal

Blood

Publication Data

June 10, 2010

Associated Grants

None

Mesh Terms

  • Animals
  • CCAAT-Enhancer-Binding Proteins
  • Cell Transformation, Neoplastic
  • Frameshift Mutation
  • Gene Expression Regulation, Leukemic
  • HL-60 Cells
  • Humans
  • Leukemia
  • Mice
  • Mice, Knockout
  • Myelopoiesis
  • Neoplastic Stem Cells
  • PTEN Phosphohydrolase
  • Polycomb-Group Proteins
  • Promoter Regions, Genetic
  • Protein Isoforms
  • Protein Processing, Post-Translational
  • Repressor Proteins
  • Signal Transduction
  • Transcription, Genetic
  • Zebrafish
  • alpha Catenin