Chapter Three - The Transcription Factor FOXM1 (Forkhead box M1): Proliferation-Specific Expression, Transcription Factor Function, Target Genes, Mouse Models, and Normal Biological Roles*

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Abstract

FOXM1 (Forkhead box M1) is a typical proliferation-associated transcription factor, which stimulates cell proliferation and exhibits a proliferation-specific expression pattern. Accordingly, both the expression and the transcriptional activity of FOXM1 are increased by proliferation signals, but decreased by antiproliferation signals, including the positive and negative regulation by protooncoproteins or tumor suppressors, respectively. FOXM1 stimulates cell cycle progression by promoting the entry into S-phase and M-phase. Moreover, FOXM1 is required for proper execution of mitosis. Accordingly, FOXM1 regulates the expression of genes, whose products control G1/S-transition, S-phase progression, G2/M-transition, and M-phase progression. Additionally, FOXM1 target genes encode proteins with functions in the execution of DNA replication and mitosis. FOXM1 is a transcriptional activator with a forkhead domain as DNA binding domain and with a very strong acidic transactivation domain. However, wild-type FOXM1 is (almost) inactive because the transactivation domain is repressed by three inhibitory domains. Inactive FOXM1 can be converted into a very potent transactivator by activating signals, which release the transactivation domain from its inhibition by the inhibitory domains. FOXM1 is essential for embryonic development and the foxm1 knockout is embryonically lethal. In adults, FOXM1 is important for tissue repair after injury. FOXM1 prevents premature senescence and interferes with contact inhibition. FOXM1 plays a role for maintenance of stem cell pluripotency and for self-renewal capacity of stem cells. The functions of FOXM1 in prevention of polyploidy and aneuploidy and in homologous recombination repair of DNA-double-strand breaks suggest an importance of FOXM1 for the maintenance of genomic stability and chromosomal integrity.

Section snippets

FOXM1 is an Activating Transcription Factor

FOXM1 (Forkhead box M1) is a typical proliferation-associated transcription factor (Wierstra & Alves, 2007c) that is also intimately involved in oncogenesis (Costa, 2005, Costa et al., 2003, Costa et al., 2005, Kalin et al., 2011, Koo et al., 2011, Laoukili et al., 2007, Raychaudhuri and Park, 2011, Wierstra and Alves, 2007c). FOXM1 is an activating transcription factor (Fig. 3.1) with a very strong acidic TAD (transactivation domain) (Wierstra, 2013a, Wierstra and Alves, 2006a) and a forkhead

Four FOXM1 splice variants arise from differential splicing of three facultative exons in the foxm1 gene

Four different splice variants of FOXM1 have been described in mammals (human, mouse, rat) (Laoukili et al., 2007, Wierstra and Alves, 2007c), namely, FoxM1A, FoxM1B, FOXM1c, and rat WIN (class a transcript) (Fig. 3.1; Korver et al., 1997, Korver et al., 1997, Lüscher-Firzlaff et al., 1999, Yao et al., 1997, Ye et al., 1997).

Human FOXM1 is expressed in three distinct splice variants (Fig. 3.1), which arise from the same gene through differential splicing of the two facultative exons A1 and A2 (

Direct and possibly indirect FOXM1 target genes, which are regulated by FOXM1 at the transcript level

FOXM1 regulates the expression of over 220 genes (Fig. 3.2). It upregulates the mRNA expression of 199 protein-coding genes and downregulates the mRNA expression of 21 protein-coding genes (Fig. 3.2; Table 3.1). Additionally, FOXM1 upregulates the expression of one miRNA and downregulates the expression of five miRNAs (Fig. 3.2; Table 3.1).

Eighty genes are direct FOXM1 target genes, that is, FOXM1 was shown to associate with their promoters in ChIP (chromatin immunoprecipitation) assays, EMSAs,

Gene regulation mechanisms of FOXM1

FOXM1 is an activating transcription factor with a forkhead domain as DBD (Korver et al., 1997, Littler et al., 2010, Wierstra, 2011a, Wierstra and Alves, 2006a, Wierstra and Alves, 2006d, Yao et al., 1997, Ye et al., 1997) and with a very strong, acidic TAD (Wierstra, 2013a, Wierstra and Alves, 2006a). Since FOXM1 is a strong transactivator (Wierstra, 2013a, Wierstra and Alves, 2006a) it can transactivate the promoters of target genes as a classical (conventional) transcription factor by

The conventional transcription factor FOXM1

FOXM1 functions as a conventional transcription factor if it binds to a conventional FOXM1-binding site upstream (or downstream) of a non-FOXM1-responsive core promoter and transactivates the promoter through its very strong acidic TAD (Alvarez-Fernandez et al., 2011, Alvarez-Fernandez et al., 2010, Alvarez-Fernandez et al., 2010, Anders et al., 2011, Bhat et al., 2009a, Bhat et al., 2009b, Chen et al., 2009, Fu et al., 2008, Gemenetzidis et al., 2009, Grant et al., 2012, Kalinichenko et al.,

FOXM1 displays a proliferation-specific expression pattern

FOXM1 is a typical proliferation-associated transcription factor (Wierstra & Alves, 2007c). Accordingly, FOXM1 exhibits a strictly proliferation-specific expression pattern so that it is expressed in all proliferating cells but not in resting cells (Costa et al., 2003, Costa et al., 2001, Kalin et al., 2011, Koo et al., 2011, Laoukili et al., 2007, Murakami et al., 2010, Raychaudhuri and Park, 2011, Wierstra and Alves, 2007c).

FOXM1 is ubiquitously expressed in the developing embryo but its

General knockout of foxm1

The knockout of foxm1 in mice is embryonically lethal (Kim et al., 2005, Korver et al., 1998, Krupczak-Hollis et al., 2004, Ramakrishna et al., 2007) with defective development of heart (Bolte et al., 2011, Korver et al., 1998, Krupczak-Hollis et al., 2004, Ramakrishna et al., 2007), lung (Kalin et al., 2008, Kim et al., 2005, Ustiyan et al., 2009, Ustiyan et al., 2012) and liver (Krupczak-Hollis et al., 2004). Thus, FOXM1 is essential for embryonic development (Fig. 3.2; Kim et al., 2005,

Stimulation of cell proliferation

FOXM1 stimulates cell proliferation and promotes cell cycle progression at both the G1/S-transition and the G2/M-transition (Fig. 3.2; Costa, 2005, Costa et al., 2003, Costa et al., 2005, Costa et al., 2005, Kalin et al., 2011, Koo et al., 2011, Laoukili et al., 2007, Mackey et al., 2003, Myatt and Lam, 2007, Raychaudhuri and Park, 2011, Wierstra and Alves, 2007c). The stimulation of proliferation is one main function of FOXM1 and forms the basis of many of its biological roles (see below).

In

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    *

    The present chapter is Part I of a two-part review on the transcription factor FOXM1. Part II of this FOXM1 review is published in Volume 119 of Advances in Cancer Research: Inken Wierstra, FOXM1 (Forkhead box M1) in tumorigenesis: overexpression in human cancer, implication in tumorigenesis, oncogenic functions, tumor-suppressive properties and target of anti-cancer therapy. Advances in Cancer Research, 2013, Volume 119, in press.

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