Characterization of the lung Krüppel-like transcription factor gene and upstream regulatory elements.
Gene
; 236(1): 185-95, 1999 Aug 05.
Article
en En
| MEDLINE
| ID: mdl-10433980
ABSTRACT
We previously described the isolation and characterization of the cDNA for lung Krüppel-like factor (LKLF), a zinc finger transcription factor that is predominately expressed in the lung of adult mice. In this study, we report the complete structure and nucleotide sequence of the mouse LKLF gene, which is comprised of three exons and two small introns. Moreover, the identification of critical sequence elements required for expression is described using reporter constructs with the LKLF promoter transfected into LA-4 lung cells. Results from these constructs reveal an important region for transcriptional activity that lies between the -490/-72bp upstream sequence. This region contains two canonical Sp1 binding sites that affect expression levels in a non tissue-specific manner. In addition, using a base-pair mutagenesis strategy, a region from -157/-72bp was found to be necessary for upregulating expression. In transfection assays, mutations of the -138/-111bp region resulted in approximately 70-80% loss of promoter activity. This cis-element does not appear to correspond to any known transcription factor consensus sequence. Moreover, mutations within this cis-region disrupt the binding of a protein complex from nuclear extracts of various tissues.
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Colección:
01-internacional
Banco de datos:
MEDLINE
Asunto principal:
Transactivadores
/
Secuencias Reguladoras de Ácidos Nucleicos
Tipo de estudio:
Prognostic_studies
Límite:
Animals
Idioma:
En
Revista:
Gene
Año:
1999
Tipo del documento:
Article
País de afiliación:
Estados Unidos