scholarly journals Loss of FAS1 function reveals rescue of an aberrant intra-S-phase checkpoint by the G2/M checkpoint regulator SOG11[OPEN]

2021 ◽  
Author(s):  
Thomas Eekhout ◽  
Martina Dvorackova ◽  
José Antonio Pedroza Garcia ◽  
Martina Nespor Dadejova ◽  
Pooneh Kalhorzadeh ◽  
...  
Keyword(s):  
Stress Sensitivity ◽  
S Phase ◽  
Chromatin Assembly ◽  
Replication Checkpoint ◽  
Chromatin Assembly Factor ◽  
Damage Response ◽  
Assembly Factor ◽  
Defective Allele ◽  
Atr Kinases ◽  
S Phase Checkpoint

ABSTRACTThe WEE1 and ATR kinases represent important regulators of the plant intra-S-phase checkpoint, as evidenced by the hypersensitivity of WEE1KO and ATRKO roots to replication inhibitory drugs. Here, we report on the identification of a defective allele of the FASCIATA1 (FAS1) subunit of the chromatin assembly factor 1 (CAF-1) complex as a suppressor of WEE1- or ATR-deficient plants. We demonstrate that lack of FAS1 activity results in the activation of an ATM- and SOG1-mediated G2/M-arrest that makes the ATR and WEE1 checkpoint regulators redundant. This ATM activation accounts for telomere erosion and loss of ribosomal DNA described for the fas1 plants. Knocking out SOG1 in the fas1 wee1 background restores replication stress sensitivity, demonstrating that SOG1 plays a prominent role as secondary checkpoint regulator in plants that fail to activate the intra-S-phase checkpoint.One-Sentence SummaryLack of the chromatin assembly factor-1 subunit FAS1 results in a DNA damage response that overrules the need for replication checkpoint activators.

scholarly journals A separable domain of the p150 subunit of human chromatin assembly factor-1 promotes protein and chromosome associations with nucleoli

2014 ◽  
Vol 25 (18) ◽  
pp. 2866-2881 ◽  
Author(s):  
Corey L. Smith ◽  
Timothy D. Matheson ◽  
Daniel J. Trombly ◽  
Xiaoming Sun ◽  
Eric Campeau ◽  
...  
Keyword(s):  
Repetitive Element ◽  
Chromatin Assembly ◽  
The Other ◽  
Dna Interactions ◽  
Interaction Sites ◽  
Chromatin Assembly Factor ◽  
Nucleolar Proteins ◽  
Nucleolar Chromosome ◽  
Assembly Factor ◽  
Chromosome Associations

Chromatin assembly factor-1 (CAF-1) is a three-subunit protein complex conserved throughout eukaryotes that deposits histones during DNA synthesis. Here we present a novel role for the human p150 subunit in regulating nucleolar macromolecular interactions. Acute depletion of p150 causes redistribution of multiple nucleolar proteins and reduces nucleolar association with several repetitive element–containing loci. Of note, a point mutation in a SUMO-interacting motif (SIM) within p150 abolishes nucleolar associations, whereas PCNA or HP1 interaction sites within p150 are not required for these interactions. In addition, acute depletion of SUMO-2 or the SUMO E2 ligase Ubc9 reduces α-satellite DNA association with nucleoli. The nucleolar functions of p150 are separable from its interactions with the other subunits of the CAF-1 complex because an N-terminal fragment of p150 (p150N) that cannot interact with other CAF-1 subunits is sufficient for maintaining nucleolar chromosome and protein associations. Therefore these data define novel functions for a separable domain of the p150 protein, regulating protein and DNA interactions at the nucleolus.

scholarly journals Essential Role of Chromatin Assembly Factor-1–mediated Rapid Nucleosome Assembly for DNA Replication and Cell Division in Vertebrate Cells

2007 ◽  
Vol 18 (1) ◽  
pp. 129-141 ◽  
Author(s):  
Yasunari Takami ◽  
Tatsuya Ono ◽  
Tatsuo Fukagawa ◽  
Kei-ichi Shibahara ◽  
Tatsuo Nakayama
Keyword(s):  
Dna Replication ◽  
Essential Role ◽  
Chromatin Assembly ◽  
Nuclear Antigen ◽  
Nucleosome Assembly ◽  
Chromatin Assembly Factor ◽  
Assembly Factor

Chromatin assembly factor-1 (CAF-1), a complex consisting of p150, p60, and p48 subunits, is highly conserved from yeast to humans and facilitates nucleosome assembly of newly replicated DNA in vitro. To investigate roles of CAF-1 in vertebrates, we generated two conditional DT40 mutants, respectively, devoid of CAF-1p150 and p60. Depletion of each of these CAF-1 subunits led to delayed S-phase progression concomitant with slow DNA synthesis, followed by accumulation in late S/G2 phase and aberrant mitosis associated with extra centrosomes, and then the final consequence was cell death. We demonstrated that CAF-1 is necessary for rapid nucleosome formation during DNA replication in vivo as well as in vitro. Loss of CAF-1 was not associated with the apparent induction of phosphorylations of S-checkpoint kinases Chk1 and Chk2. To elucidate the precise role of domain(s) in CAF-1p150, functional dissection analyses including rescue assays were preformed. Results showed that the binding abilities of CAF-1p150 with CAF-1p60 and DNA polymerase sliding clamp proliferating cell nuclear antigen (PCNA) but not with heterochromatin protein HP1-γ are required for cell viability. These observations highlighted the essential role of CAF-1–dependent nucleosome assembly in DNA replication and cell proliferation through its interaction with PCNA.

Chromatin Assembly Factor-1/p60 overexpression: a potential index of psoriasis severity

2014 ◽  
Vol 24 (4) ◽  
pp. 509-511 ◽  
Author(s):  
Massimo Mascolo ◽  
Fabio Ayala ◽  
Gennaro Ilardi ◽  
Anna Balato ◽  
Serena Lembo
Keyword(s):  
Chromatin Assembly ◽  
Chromatin Assembly Factor ◽  
Potential Index ◽  
Assembly Factor ◽  
Psoriasis Severity

scholarly journals Chromatin Assembly Factor 1 (CAF-1) facilitates the establishment of facultative heterochromatin during pluripotency exit

2019 ◽  
Vol 47 (21) ◽  
pp. 11114-11131 ◽  
Author(s):  
Liang Cheng ◽  
Xu Zhang ◽  
Yan Wang ◽  
Haiyun Gan ◽  
Xiaowei Xu ◽  
...  
Keyword(s):  
Cell Fate ◽  
Embryonic Stem ◽  
Chromatin Assembly ◽  
Nuclear Antigen ◽  
Gene Promoters ◽  
Cell Fate Determination ◽  
Nucleosome Assembly ◽  
Fate Determination ◽  
Chromatin Assembly Factor ◽  
Assembly Factor

Abstract Establishment and subsequent maintenance of distinct chromatin domains during embryonic stem cell (ESC) differentiation are crucial for lineage specification and cell fate determination. Here we show that the histone chaperone Chromatin Assembly Factor 1 (CAF-1), which is recruited to DNA replication forks through its interaction with proliferating cell nuclear antigen (PCNA) for nucleosome assembly, participates in the establishment of H3K27me3-mediated silencing during differentiation. Deletion of CAF-1 p150 subunit impairs the silencing of many genes including Oct4, Sox2 and Nanog as well as the establishment of H3K27me3 at these gene promoters during ESC differentiation. Mutations of PCNA residues involved in recruiting CAF-1 to the chromatin also result in defects in differentiation in vitro and impair early embryonic development as p150 deletion. Together, these results reveal that the CAF-1-PCNA nucleosome assembly pathway plays an important role in the establishment of H3K27me3-mediated silencing during cell fate determination.

scholarly journals Control of trichome branching by Chromatin Assembly Factor-1

2008 ◽  
Vol 8 (1) ◽  
pp. 54 ◽  
Author(s):  
Vivien Exner ◽  
Wilhelm Gruissem ◽  
Lars Hennig
Keyword(s):  
Chromatin Assembly ◽  
Chromatin Assembly Factor ◽  
Assembly Factor
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