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PBX1

                                                                     

OMIM GENE CARDS CGAP
176310 PBX1  155691

 

 

SYNONYMS pre-B-cell leukemia transcription factor 1

 

Protein Sequence

 

Biochemical  Type 

  • The human t(1;19) translocation in pre-B ALL produces multiple nuclear E2A-Pbx1 fusion proteins with differing transforming potentials. Kamps MP, Look AT, Baltimore D.

Cell Location

Chromosome Human

Chromosome Mouse

  • E2A-Pbx1 the t(1;19) translocation protein of human pre-B-cell acute lymphocytic leukemia, causes acute myeloid leukemia in mice. Kamps MP, Baltimore D.

Clinical

  • Clinical implications of recurring chromosomal and associated molecular abnormalities in acute lymphoblastic leukemia. Ferrando AA, Look AT.

Development

  • Complex genetic and biochemical interactions between HOX proteins and members of the TALE (i.e., PBX and MEIS) family have been identified in embryonic development, and some of these interactions also appear to be important for leukemic transformation Thorsteinsdottir U, Kroon E, Jerome L, Blasi F, Sauvageau G.

DNA Binding

  • Heterodimerization of Hox proteins with Pbx1 and oncoprotein E2a-Pbx1 generates unique DNA-binding specifities at nucleotides predicted to contact the N-terminal arm of the Hox homeodomain--demonstration of Hox-dependent targeting of E2a-Pbx1 in vivo. Lu Q, Kamps MP.

Function

  • Pim1 and E2a-Pbx1 cooperate in T lineage lymphomagenesis but they are not sufficient and the role of Pim1 is more likely to be associated with tumor progression. Feldman BJ, Reid TR, Cleary ML.

  • E2A-Pbx1 induces growth, blocks differentiation, and interacts with other homeodomain proteins regulating normal differentiation. Kamps MP.

Oncogenic  Activation

Protein Binding

  • The E2a-Pbx1 fusion protein expressed in pre-B cells having this translocation will activate, in response to cAMP, transcription of genes not normally expressed in these cells leading to arrest of differentiation at the pre-B cell stage.  Ogo A, Waterman MR, Kamps MP, Kagawa N.

Tumor Gene Type

  • The p16INK4A (p16) and p15INK4B (p15) tumor suppressor genes are inactivated by homozygous gene deletion and p15 promoter hypermethylation in a significant proportion of childhood acute lymphoblastic leukemias  Maloney KW, McGavran L, Odom LF, Hunger SP.

Tumor Incidence

  • In childhood acute lymphoblastic leukaemia (ALL), cytogenetics plays an essential role in diagnosis and prediction of outcome Harrison CJ.

 

 

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