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Oncogenic role of Pax5 in the T-lymphoid lineage upon ectopic expression from the immunoglobulin heavy-chain locus.

Abstract：

:Four of 9 PAX transcription factor genes have been associated with chromosomal translocations in human tumors, although their oncogenic potential has not yet been demonstrated in transgenic mouse models. The B-lymphoidPAX5 gene participates in the generation of the t(9;14)(p13;q32) translocation in germinal center B cells, which leads to deregulated PAX5 expression under the control of the immunoglobulin heavy-chain (IgH) locus in a subset of B-cell non-Hodgkin lymphomas. Here we reconstructed a human t(9;14) translocation in a knock-in mouse by inserting a PAX5 minigene into the IgH locus. The IgH(P5ki) allele, which corresponds to a germline rather than somatic mutation, is activated in multipotent hematopoietic progenitors and is subsequently expressed in dendritic cells (DCs) and in natural killer (NK), T, and B cells. Ectopic Pax5 expression interferes with normal T-cell development and causes immature T-lymphoblastic lymphomas in IgH(P5ki/+) and IgH(P5ki/P5ki) mice. Aggressive T-cell lymphomas develop even faster in Ik(Pax5/+) mice expressing Pax5 from the Ikaros locus. Pax5 expression in thymocytes activates B-cell-specific genes and represses T-lymphoid genes, suggesting that Pax5 contributes to lymphomagenesis by deregulating the T-cell gene-expression program. These data identify Pax5 as a potent oncogene and demonstrate that the T-lymphoid lineage is particularly sensitive to the oncogenic action of Pax5.

journal_name

Blood

journal_title

Blood

authors

Souabni A,Jochum W,Busslinger M

doi

10.1182/blood-2006-03-009670

subject

Has Abstract

pub_date

2007-01-01 00:00:00

pages

281-9

issue

1

eissn

0006-4971

issn

1528-0020

pii

blood-2006-03-009670

journal_volume

109

pub_type

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