Novel SWI/SNF chromatin-remodeling complexes contain a mixed-lineage leukemia chromosomal translocation partner.
Mol Cell Biol
; 23(8): 2942-52, 2003 Apr.
Article
em En
| MEDLINE
| ID: mdl-12665591
ABSTRACT
The SWI/SNF family of chromatin-remodeling complexes has been discovered in many species and has been shown to regulate gene expression by assisting transcriptional machinery to gain access to their sites in chromatin. Several complexes of this family have been reported for humans. In this study, two additional complexes are described that belong to the same SWI/SNF family. These new complexes contain as many as eight subunits identical to those found in other SWI/SNF complexes, and they possess a similar ATP-dependent nucleosome disruption activity. But unlike known SWI/SNFs, the new complexes are low in abundance and contain an extra subunit conserved between human and yeast SWI/SNF complexes. This subunit, ENL, is a homolog of the yeast SWI/SNF subunit, ANC1/TFG3. Moreover, ENL is a fusion partner for the gene product of MLL that is a common target for chromosomal translocations in human acute leukemia. The resultant MLL-ENL fusion protein associates and cooperates with SWI/SNF complexes to activate transcription of the promoter of HoxA7, a downstream target essential for oncogenic activity of MLL-ENL. Our data suggest that human SWI/SNF complexes show considerable heterogeneity, and one or more may be involved in the etiology of leukemia by cooperating with MLL fusion proteins.
Texto completo:
1
Base de dados:
MEDLINE
Assunto principal:
Fatores de Transcrição
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Proto-Oncogenes
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Cromatina
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Proteínas Cromossômicas não Histona
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Proteínas de Ligação a DNA
Limite:
Humans
Idioma:
En
Revista:
Mol Cell Biol
Ano de publicação:
2003
Tipo de documento:
Article
País de afiliação:
Estados Unidos