The RAR alpha-PLZF chimera associated with Acute Promyelocytic Leukemia has retained a sequence-specific DNA-binding domain.
Oncogene
; 14(9): 1067-74, 1997 Mar 06.
Article
em En
| MEDLINE
| ID: mdl-9070655
ABSTRACT
In most cases, Acute Promyelocytic Leukemia (APL) is associated with t(15;17) translocation which juxtaposes sequences from PML and retinoic acid receptor alpha (RAR alpha) genes. The generated PML-RAR alpha fusion interferes with wild type RAR alpha-mediated transcription and disrupts subnuclear compartments, known as PML bodies. Both defects are corrected by all trans retinoic acid (ATRA) therapy which induces differentiation of leukemic cells and clinical remission. In a rare APL syndrome associated with t(11;17), fusion of the RAR alpha gene with the PLZF gene, encoding a Zinc-finger protein produces two reciprocal RAR alpha chimeras. Although PLZF-RAR alpha and PML-RAR alpha are similar in their apparent dominant negative effects, t(11;17)-associated APL is refractory to ATRA therapy. In a yeast two-hybrid genetic screening, we isolated clones encoding the GAL4 transactivation domain fused to various parts of PLZF. Using these autonomously transactivating hybrids, similar in structure to the RAR alpha-PLZF fusion, we mapped the DNA-binding domain of PLZF to the last five Zinc-fingers, a region retained in RAR alpha-PLZF chimera and characterized a specific PLZF target sequence. Our data support the hypothesis that RAR alpha-PLZF chimera is not an inert product of reciprocal translocation and may thus contribute to ATRA unresponsiveness of t(11;17)-associated APL.
Buscar no Google
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Fatores de Transcrição
/
Leucemia Promielocítica Aguda
/
Receptores do Ácido Retinoico
/
Proteínas de Saccharomyces cerevisiae
/
Proteínas de Ligação a DNA
Tipo de estudo:
Risk_factors_studies
Limite:
Humans
Idioma:
En
Revista:
Oncogene
Assunto da revista:
BIOLOGIA MOLECULAR
/
NEOPLASIAS
Ano de publicação:
1997
Tipo de documento:
Article
País de afiliação:
França