Critical function of Ikaros in controlling Aiolos gene expression.
FEBS Lett
; 581(8): 1605-16, 2007 Apr 17.
Article
en En
| MEDLINE
| ID: mdl-17383641
ABSTRACT
To characterize the regulation of lymphoid Aiolos transcription factor, we have cloned its promoter. Full promoter and nested deletions were expressed in lymphoid and non-lymphoid cell lines. The minimal promoter activity could be considered as a 172bp upstream from the ATG for Jurkat and HEK293 cells and as a 370bp fragment for U937 cells. Moreover, we have mapped the transcription initiation site. Retardation gels showed binding activity for Ikaros, NFkappaB and AP4 transcription factors and mutations in their binding sites abolish Aiolos promoter activity. Chromatin immunoprecipitation assay revealed that Ikaros, NFkappaB and AP4 are bound to Aiolos promoter. The important function of Ikaros and NFkappaB is underlined by their over expression, which results in the trans-activation of the promoter and drives Aiolos expression in cell lines and in freshly isolated B and T cells, while over expression of a dominant negative Ikaros isoform is able to block Aiolos expression.
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Base de datos:
MEDLINE
Asunto principal:
Factores de Transcripción
/
Regulación de la Expresión Génica
/
Factor de Transcripción Ikaros
Límite:
Humans
Idioma:
En
Revista:
FEBS Lett
Año:
2007
Tipo del documento:
Article
País de afiliación:
Francia