Combination of chromatin immunoprecipitation (ChIP) microarray analysis and time course gene expression microarray analysis with and without siRNA-mediated inhibition of HSF1 showed that human HSF1 can induce the expression of different sets of target genes to maintain a wide range of biological processes (e.g., anti-apoptosis, RNA splicing, ubiquitination)(Page TG et al. 2006; Vihervaara A. et al. 2013). However, HSF1 is best known for rapid stress-induced upregulation of certain genes related to protein folding, such as HSPA1A/HSP70, HSPC/HSP90, HSPB1/HSP27, and DNAJB1/HSP40 (Mosser DD et al. 1988; Trinklein ND et al. 2004a,b; Page TG et al. 2006; Vihervaara A. et al. 2013).
In the nucleus acetylation of Histone H3 is linked to the function of the Elongator complex in transcription (Kim JH et al. 2002). Elongator complex protein 3 (ELP3), a catalytic acetyltransferase subunit of the Elongator complex, has been reported to regulate the transcription of HSP70 gene, and the histone acetyltransferase (HAT) domain of ELP3 is essential for this function (Han Q et al. 2007; Li F et al. 2001).