Upregulation of Meis1 and HoxA9 in acute lymphocytic leukemias with the t(4 : 11) abnormality

Oncogene
T RozovskaiaEli Canaani

Abstract

Rearrangements of the human ALL-1 gene are frequently encountered in acute lymphocytic leukemias (ALL) and acute myeloid leukemias (AML). These rearrangements are mostly due to chromosome translocations and result in production of chimeric proteins composed of the N-terminal fragment of ALL-1 and the C-terminal segments of the partner proteins. The most common chromosome translocation involving ALL-1 is the t(4 : 11) associated with ALL. ALL-1 is the human homologue of Drosophila trithorax and directly activates transcription of multiple Hox genes. A preliminary DNA microarray screen indicated that the Meis1, HoxA9 and AC133 genes were overexpressed in ALLs with t(4 : 11), compared to ALLs with very similar phenotype but without the chromosomal abnormality. These genes, as well as additional five Hox genes, were subjected to comprehensive semi-quantitative or quantitative RT-PCR analysis in 57 primary ALL and AML tumors. Meis1 and HoxA9 were found expressed in 13/14 of ALLs with the t(4 : 11) and in 8/8 of AMLs with ALL-1 rearrangements. The two genes were not consistently transcribed in other types of ALL. AC133 was transcribed in 13/14 of ALLs with t(4 : 11), but in only 4/8 of AMLs with ALL-1 rearrangements. HoxA10 was expre...Continue Reading

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