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Indirect immunofluorescence analysis, using antibodies directed against peptide sequences outside the DNA-binding domain of the 67-kDa serum response factor (p67SRF), revealed a punctuated nuclear staining, constant throughout the cell cycle and in all different cell lines tested. p67SRF was also tightly associated with chromatin through all stages of mitosis. Inhibition of p67SRF activity in vivo, through microinjection of anti-p67SRF antibodies, specifically suppressed DNA synthesis induced after serum addition or ras microinjection, suggesting that these antibodies were effective in preventing expression of serum response element (SRE)-regulated genes. A similar inhibition was also obtained in cells injected with oligonucleotides corresponding to the DNA binding sequence for p67SRF protein, SRE. Moreover, this inhibition of DNA synthesis by anti-p67SRF or SRE injection was still observed in cells injected during late G1, well after c-fos induction. These data imply that genes regulated by p67SRF are continuously involved in the proliferation pathway throughout G1 and that p67SRF forms an integral component of mammalian cell transcriptional control.

p67SRF is a constitutive nuclear protein implicated in the modulation of genes required throughout the G1 period.