Abstract
The expression of the c-fos gene is transiently induced at birth in most organs in the mouse. To study the basis of this induction we searched for a nuclear factor that binds to the 5' regulatory region of the c-fos gene. Gel mobility shift assays with tissue extracts revealed fast (band I) and slow (band III) migrating bands, which represent factor binding to the c-fos enhancer, termed the serum response element (SRE). Neonatal extracts preferentially elicited band I, with low or undetectable levels of band III, whereas fetal and adult extracts generated predominantly band III, with reduced levels of band I. These results indicate that the SRE-binding activity changes during perinatal development and that the appearance of band I, which coincides with diminution of band III, correlates with neonatal c-fos induction. Methylation interference and competition analyses showed that the neonatal factor (band I) binds to the SRE at a site different from the adult factor (band III). DNA-binding activity of the adult factor, but not the neonatal factor, was sensitive to phosphatase treatment. Furthermore, the adult factor, but not the neonatal factor, shared antigenic specificity with the human serum response factor (SRF) that is expressed in cultured cells irrespective of c-fos gene induction. We conclude that band I in neonates represents a SRE-binding factor that is distinct from the SRF, which may be responsible for the neonatal induction of the c-fos gene. The band III factor was indistinguishable from the SRF in all criteria tested.
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