Abstract
Development, tissue renewal and long term survival of multi-cellular organisms is dependent upon the persistence of stem cells that are quiescent, but retain the capacity to re-enter the cell cycle to self-renew, or to produce progeny that can differentiate and re-populate the tissue. Deregulated release of these cells from the quiescent state, or preventing them from entering quiescence, results in uncontrolled proliferation and cancer. Conversely, loss of quiescent cells, or their failure to re-enter cell division, disrupts organ development and prevents tissue regeneration and repair. Understanding the quiescent state and how cells control the transitions in and out of this state is of fundamental importance. Investigations into the mechanics of G1 arrest during the transition to quiescence continue to identify striking parallels between the strategies used by yeast and mammals to regulate this transition. When cells commit to a stable but reversible arrest, the G1/S genes responsible for promoting S phase must be inhibited. This process, from yeast to humans, involves the formation of quiescence-specific complexes on their promoters. In higher cells, these so-called DREAM complexes of E2F4/DP/RBL/MuvB recruit the highly conserved histone deacetylase HDAC1, which leads to local histone deacetylation and repression of S phase-promoting transcripts. Quiescent yeast cells also show pervasive histone deacetylation by the HDAC1 counterpart Rpd3. In addition, these cells contain quiescence-specific regulators of G1/S genes: Msa1 and Msa2, which can be considered components of the yeast equivalent of the DREAM complex. Despite a lack of physical similarities, the goals and the strategies used to achieve a reversible transition to quiescence are highly conserved. This motivates a detailed study of this process in the simple model organism: budding yeast.
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Introduction
The need to control proliferation and maintain a protective, reversible quiescent state is critical for survival of most organisms. The quiescent state of budding yeast shares many important features with that of higher cells (Valcourt et al. 2012) and the cell cycle is fundamentally conserved (Tang 2016). As such, the strategies for arresting and maintaining this non-dividing quiescent state are likely to be shared. Cells enter quiescence from G1. This requires that the cell cycle machinery that promotes the G1 to S phase transition in proliferating cells must be eliminated or inactivated. In budding yeast, Swi4/Swi6 (or SBF) transcription complexes activate G1/S-specific genes, including cyclins, histones and other genes that promote the transition to S phase (Fig. 1). These complexes are inactive in early G1 due to the binding of Whi5 (Costanzo et al. 2004; de Bruin et al. 2004). Whi5 and another complex component (Stb1) recruit the histone deacetylase (Rpd3) (Huang et al. 2009; Takahata et al. 2009; Wang et al. 2009) to deacetylate surrounding nucleosomes and repress transcription. Derepression of these complexes occurs when the cyclin-dependent kinase complex Cln3/Cdk phosphorylates and releases Whi5. Swi6 also associates with a second DNA binding protein, Mbp1, which is related to Swi4 and binds to a similar but distinct DNA sequence (Koch et al. 1993). Referred to as MBF, Mbp1/Swi6 confers late-G1 specific transcription on many genes involved in DNA replication and repair. This wave of late G1 transcription is critical for the timing and fidelity of DNA replication. If the G1 to S transition is accelerated, there are checkpoint proteins, including Rad53, that detect replication stress and become essential for delaying S phase and promoting DNA repair (Sidorova and Breeden 2002; Vallen and Cross 1999). This is achieved by Rad53-dependent phosphorylation and removal of the Nrm1 repressor from Mbp1/Swi6 target genes (de Bruin et al. 2008).
A strikingly similar strategy (Fig. 1) is used in mammalian cells (reviewed in Trimarchi and Lees 2002). In cycling cells, there are several E2F/Dp1 protein complexes that activate transcription of G1/S genes. Many of their targets are the same as the G1/S genes in budding yeast (e.g. cyclins, histones, and replication proteins). These transcription complexes are inactive in early G1 due to the binding of the RB or RB-like proteins (Nevins 1992), which, like Whi5, recruit histone deacetylase and repress target genes (Brehm et al. 1998; Luo et al. 1998). Removal of RB requires phosphorylation by cyclin D/Cdks. This enables E2F/Dp1 to induce transcription of their target genes, and promote the transition to S phase. As in budding yeast, replication stress activates a conserved DNA checkpoint pathway, which phosphorylates and releases negative regulators and enables cells to sustain the levels of G1/S transcripts required to maintain DNA integrity and promote survival (Bertoli et al. 2013).
Defining one pathway to quiescence in budding yeast
The accumulation of evidence indicates that the general strategies of transcriptional control and checkpoint signaling at the G1 to S transition are fundamentally conserved. This motivates a detailed look at how this G1 to S transition is stably but reversibly halted when budding yeast transition from growth to quiescence. The advantage of studying these processes in a unicellular eukaryote is that these cells can be followed as they naturally enter quiescence, without any intervention or genetic manipulation. Wild yeast can survive on a simple mixture of inorganic salts and a soluble carbon source. When these cells are grown to saturation in rich glucose medium, they first limit for glucose at a point that is referred to as the diauxic shift (DS). However, even before they undergo the DS, they begin the transition from logarithmic growth to quiescence with a lengthening of G1 (Miles et al. 2013). After 2 days, over 90 % of the cells are arrested in G1 and they are full of stored glucose (Lillie and Pringle 1980). The last cell divisions, as cells approach stationary phase, are highly asymmetric and the physical growth of the daughter cells slows, resulting in a dramatic shift in the size of the cells (Li et al. 2013) (Fig. 2a). Cell wall fortification also takes place (Shimoi et al. 1998) and the cells destined to become quiescent become very dense, so they can be purified by sedimentation (Allen et al. 2006). About 50 % of cells become quiescent and they are primarily daughter cells. This process of G1 arrest, asymmetric cell division and cell wall fortification leads to the production of three distinct cell types (Li et al. 2013), which can be distinguished by flow cytometry after 24 h in culture (Fig. 2b). The R1 cells are the very small daughter cells that result from the asymmetric cell divisions. The R2 cells are the non-quiescent mother cells, and the R3 cells are the dense daughter cells that can be purified. These R3 cells are uniformly G1 arrested and highly stress tolerant. In contrast, the cells that remain at the top of the gradient are more heterogeneous, less stress tolerant, and show signs of apoptosis (Allen et al. 2006; Li et al. 2009, 2013). A critical feature and defining characteristic of a quiescent cell is the ability to survive for long periods of time in the non-dividing state and then reverse the arrest and re-enter the cell cycle when conditions improve. These purified R3 cells can survive for over a year in water (unpubl). From this state, they readily and synchronously return to the cell cycle (Allen et al. 2006). The uniform G1 arrest, high stress tolerance, longevity in the non-dividing state and ready reversal of that state are all indicators that this R3 sub-population of a stationary phase culture is in a quiescent state.
Conserved role for the Rpd3/HDAC1 histone deacetylase
As budding yeast transition to quiescence, the Rad53 checkpoint kinase plays a measurable, protective role against Reactive Oxygen Species accumulation and apoptosis, and, just as in cycling cells, Rad53 becomes essential if the G1 to S transition is accelerated by overproduction of the G1 cyclin Cln3 (Miles et al. 2013). CLN3 transcription is normally repressed as cells approach the diauxic shift (Barbet et al. 1996; DeRisi et al. 1997), and that repression is maintained in post-diauxic cells by Xbp1 (Miles et al. 2013). Xbp1 is not expressed in log phase cells (Mai and Breeden 1997), but it is induced to high levels after the DS and it represses over 800 genes, including CLN3. Xbp1 recruits the histone deacetylase, Rpd3 (Tao et al. 2011), which suggested that there might be a similar global drop in histone acetylation. Figure 3 shows the drop in acetylation at four amino-terminal sites in histone H4 as cells transition from log phase, through the diauxic shift (14 h) and into quiescence (Q). This drop in H4 acetylation and several other histone acetylations is dependent upon Rpd3 (McKnight et al. 2015).
Genome-wide analysis indicates that Rpd3 is recruited to thousands of promoters in quiescent cells. These include SBF-regulated promoters and the promoters of many other growth-related and cell cycle-specific genes (McKnight et al. 2015). At these sites, Rpd3 causes hypo-acetylation of histones and a unique quiescence-specific chromatin state that is not elicited by abrupt starvation (McKnight et al. 2015). The result is a genome-wide 30-fold transcriptional repression, which occurs long after the diauxic shift. Cells lacking Rpd3 produce very few quiescent cells and they are short lived, indicating that this Rpd3-dependent chromatin remodeling is required for the transition into quiescence and for longevity in the non-dividing state. Interestingly, rpd3 mutants significantly extend replicative life span (RLS), which is a measure of the number of cell divisions a single cell can undergo (Jiang et al. 2002). One possible explanation for this extended RLS is that these cells continue to divide because they cannot respond to environmental changes that normally trigger the Rpd3-dependent transition to quiescence.
There is considerable evidence that Rpd3 plays a similar role in quiescence in metazoan cells. It is known that histone deacetylase (HDAC) inhibitors can deplete reservoirs of non-dividing leukemic stem cells (Zhang et al. 2010) and reactivate latent HIV-infected cells (Margolis 2011; Savarino et al. 2009; Shirakawa et al. 2013). The Rpd3 histone deacetylase is highly conserved (Yang and Seto 2008) and its closest mammalian homolog is HDAC1 (Taunton et al. 1996). Deletion of HDAC1 accelerates tumor development in epidermis (Winter et al. 2013), and in T and B cells (Dovey et al. 2010; Santoro et al. 2013). Data suggest that HDAC1 functions as a tumor suppressor in normal cells and developing tumors, but established tumors are dependent upon its deacetylase activity (Heideman et al. 2013). One possibility is that its role in established tumors is to maintain a population of quiescent cancer stem cells. Consistent with this, complexes of HDAC1 and associated proteins (e.g. mSin3b and Sds3) are recruited by RB-like proteins to repress E2F-regulated promoters specifically in quiescent cells (Fig. 1; Alland et al. 2002; Rayman et al. 2002). Mouse embryonic fibroblasts lacking mSin3B divide normally under good growth conditions, but they are defective in exiting the cell cycle when signaled to terminally differentiate or enter quiescence (David et al. 2008). These data support the view that HDAC1/Rpd3 performs a conserved function in preventing uncontrolled proliferation and conferring the quiescent state.
One obvious question is whether the Rpd3(HDAC1)-mediated repression of E2F-regulated promoters is solely responsible for the quiescence-promoting activity of these complexes, or if its role in the global repression of transcription also contributes. It is known that recruitment of Rpd3 to the SBF-targeted G1/S genes of budding yeast requires the presence of Whi5 and Stb1 (Sin Three Binding protein 1) in the SBF complexes (Takahata et al. 2009). We have looked at whi5stb1 mutants and find that they produce wild-type levels of quiescent cells (Miles et al. 2016), while rpd3 mutants produce very few quiescent cells (McKnight et al. 2015). This indicates that, at least in budding yeast, the global chromatin remodeling and transcriptional repression that Rpd3 mediates is critically important for the full transition to a quiescent state.
Novel roles for known cell cycle regulators
Quiescent cells have G1 DNA content, so it follows that the gene products that promote the transition from G1 to S phase should be eliminated or inhibited. Consistent with this, Cln3, which is rate limiting for the G1 to S transition in budding yeast (Cross 1988) reduces quiescent cell yields when it is over-produced and increases quiescent cell yields when it is absent (Miles et al. 2013). In a survey of 26 mutants that affect the length of G1 during rapid growth, we found that there is a strong correlation between the length of G1 and the quiescent cell yield (Miles et al. 2016). This suggests that, as cells enter quiescence from G1, some time is required to assemble the requisite complexes.
Interestingly, Whi5, the negative regulator of SBF and functional paralog of RB, is not absolutely required for the transition to quiescence, but it does influence the efficiency of the transition in and out of quiescence (Miles et al. 2016). This phenotype is enhanced by elimination of the Whi5-related protein Srl3. Srl3 is a suppressor of Rad53 lethality when over-produced (Ouspenski et al. 1999). Srl3 is induced by DNA damage and other forms of stress (Gasch et al. 2000; Lee et al. 2000; Ragni et al. 2011). It has been shown to bind SBF transiently in DNA damage (Travesa et al. 2013) and mediate the nuclear localization of Cln3 (Yahya et al. 2014). The whi5srl3 mutant is slow to arrest in G1 (Miles et al. 2016), but after 7 days in culture, it achieves G1 arrest just like wild type (Fig. 4a). Its most pronounced defect is that it is very delayed in budding and DNA synthesis upon re-feeding quiescent cells (Miles et al. 2016; Fig. 4b). This role in speeding cell cycle re-entry is unexpected for negative regulators of the G1 to S transition and suggests novel functions for these proteins. One possible explanation is that Whi5 and/or Srl3 must be present on SBF target genes to enable their efficient activation by Cyclin3/Cdk at the appropriate time during the recovery cycle. The whi5srl3 mutant has no difficulty releasing from a G1 arrest induced by the mating pheromone alpha factor (Fig. 4c), which indicates that there is a fundamental difference between these two types of cell cycle arrest and recovery. There is also a significantly longer lag before budding and DNA synthesis in the quiescent cell recovery cycle compared to release from alpha factor arrest.
In contrast, loss of the SBF components Swi4 or Swi6, which activate G1/S transcripts and promote S phase, interferes with the transition to quiescence. These mutants never attain the cell densities of wild-type cells at saturation and suffer significant cell death (Miles et al. 2016). The finding that Swi4 and Swi6 are also critical for surviving the transition to quiescence suggested that there might be other quiescence-specific components associated with this SBF complex that would turn these activators into repressors when nutrients are limiting.
Novel quiescence-specific regulators of G1/S genes
Two potential candidates for modulating G1/S transcription during the transition to quiescence are Msa1 and Msa2. These are structurally related proteins that associate with SBF and MBF, but their influence on SBF and MBF activity in cycling cells is minor (Ashe et al. 2008). Msa1 suppresses some temperature sensitive DNA synthesis mutants, but is deleterious to several others when over-produced (Li et al. 2008). Msa2 had no such activity, suggesting no redundancy of function. These authors identified 50 genes that were bound and regulated by Msa1 in cycling cells, but they had no clear connection to DNA synthesis or SBF activity. Msa1 also binds Dbf4, the regulatory subunit of the Dbf4/Cdc7 kinase, which is required for DNA replication and the replication stress checkpoint (Chen et al. 2013). These data suggest a role for Msa1 in DNA replication or the DNA replication stress checkpoint. Consistent with this, both single mutants are sensitive to replication stress and the msa1msa2 double mutant is more sensitive (Fig. 5). This indicates that these two proteins share some role, directly or indirectly, in DNA synthesis and/or the replication stress checkpoint. Msa1 and Msa2 also associate with Ste12 and Tec1 to bind and activate two genes involved in pseudohyphal development (van der Felden et al. 2014). In osmotic stress, Msa1 and Whi5 are phosphorylated by Hog1 kinase and this leads to inhibition of SBF targets (Gonzalez-Novo et al. 2015). These observations suggest that Msa1 and Msa2 are involved in coordinating cell division and development in response to environmental changes.
We have assayed Msa1 and Msa2 mutants for their roles in the transition to quiescence and find that they are both important during this transition (Miles et al. 2016). The msa1msa2 cells are unable to arrest in G1 and they lose viability rapidly. Unlike wild-type cells, they continue to increase in cell size, so they have also lost the ability to restrict physical growth during the transition to quiescence. Interestingly, the msa1msa2 cells that manage to arrest in G1 can form quiescent cells which have high stress tolerance and normal longevity. This indicates that the Msa proteins share a role in entry but not maintenance of the quiescent state. The single mutants have modest phenotypes, but in the absence of Rad53 checkpoint activity, they are also defective in G1 arrest and growth arrest. We conclude that Msa1 and Msa2 are important cell cycle regulators during the transition to quiescence and cells rely on the Rad53 checkpoint function when either protein is missing. We have carried out RNA deep sequencing with wild-type, and the single and double msa mutants as cells transition from log phase into stationary phase. Msa1 and Msa2 have little influence on transcription in rapidly cycling cells. However, during the transition to quiescence, Msa1 and Msa2 bind and repress an important subset of SBF target genes, including SWI4, CLN2 and all the histone genes (Miles et al. 2016). They also bind and activate transcription of many MBF target genes (Miles et al. 2016). The Msa-activated MBF targets are enriched for genes that are involved in DNA repair and chromosome cohesion. The fact that Msa1 and Msa2 are important for the successful transition to quiescence suggest that some or all of these transcriptional changes are important for achieving a quiescent state.
Msa1 and Msa2 are present in the nucleus and bind SBF and MBF specifically during G1 phase of every cell cycle (Ashe et al. 2008; Li et al. 2008). Our working model is that this tight G1-specific regulation persists in cycling cells so that cells confronted with a waning nutrient supply or other stresses can respond immediately and reprogram their G1/S-specific transcription complexes from a proliferation-specific pattern to a protective, quiescence-specific pattern. Swi4/Swi6 and Mbp1/Swi6 provide critical docking sites for Msa1 and Msa2, which enable this reprogramming to take place. Here again, there is a striking parallel to the transcriptional regulation that promotes the transition from G1 to quiescence in metazoans (Fig. 1). In higher cells, entry into quiescence depends on the formation of novel “DREAM” complexes that serve to repress target genes that are E2F-activated in proliferating cells. This complex of DP1, RBL, E2F4 and MuvB was first identified in worms and flies (Ceol and Horvitz 2001; Korenjak et al. 2004) and later found to carry out the same function in human cells (Litovchick et al. 2007). The DREAM complex is required for entering quiescence and disruption of these complexes drives cells back into the cell cycle (Sadasivam and DeCaprio 2013). Msa1 and Msa2 appear to perform a similar function. They are not required in cycling cells, but they reprogram SBF and MBF activity during the transition to quiescence. In their absence, cells fail to arrest in G1 and lose viability. Msa1 and Msa2, as well as the two RB paralogs (Whi5 and Srl3) are also required for efficient recovery from quiescence. It will be interesting to determine what triggers this reprogramming and how the effected transcripts contribute to cell cycle exit and re-entry.
In summary, many of the key components of the cell duplication cycle (e.g. DNA replication, mitosis, mitochondrial fusion and fission) are functionally and structurally conserved to the extent that the mammalian gene product can sometimes replace its yeast homolog. Here we have highlighted the striking conservation of the regulatory strategies used to exit the cell cycle and enter a reversible quiescent state. This regulation primarily involves controlling the transcription of genes required to drive the transition to S phase. The transcription complexes involved are not related at the sequence level, but their targets are conserved, their mechanism of activation by cyclin-dependent kinases is conserved, and their histone deacetylase-dependent repression is conserved. More recently, quiescence-specific additions to these transcription complexes have been identified in yeast, flies, frogs and humans that promote and stabilize this protective, reversible resting state. It is reasonable to expect further similarities will be discovered. Now that we can study pure populations of quiescent yeast, we can expedite the understanding of this complex but conserved regulatory process.
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Acknowledgments
We thank members of the Breeden lab for helpful comments on the manuscript. This work was supported by the National Institutes of Health, National Institute on Aging Grant R21-AG048595 to L. L. B.
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Communicated by M. Kupiec.
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Miles, S., Breeden, L. A common strategy for initiating the transition from proliferation to quiescence. Curr Genet 63, 179–186 (2017). https://doi.org/10.1007/s00294-016-0640-0
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DOI: https://doi.org/10.1007/s00294-016-0640-0