Zhao X, Xiong J, Mao F, Sheng Y, Chen X, Feng L, Dui W, Yang W, Kapusta A, Feschotte C, Coyne RS, Miao W, Gao S, Liu Y (2019) RNAi-dependent Polycomb repression controls transposable elements in Tetrahymena. Genes & development 33(5-6):348-364 PUBMED:30808657
Ashraf K, Nabeel-Shah S, Garg J, Saettone A, Derynck J, Gingras AC, Lambert JP, Pearlman RE, Fillingham J (2019) Proteomic analysis of histones H2A/H2B and variant Hv1 in Tetrahymena thermophila reveals an ancient network of chaperones. Molecular biology and evolution ( ): PUBMED:30796450
Tian M, Loidl J (2018) A chromatin-associated protein required for inducing and limiting meiotic DNA double-strand break formation. Nucleic acids research ( ): PUBMED:30357385
HHO1 knockouts show no global increase or decrease in the amount of transcription in the cell; however, these same knockouts also show that Hho1p is important for the transcriptional regulation of individual genes in response to stimuli, such as starvation. The differential regulation of Hho1p by phosphorylation under vegetative growth and starvation conditions has been well studied. During vegetative growth, Hho1p is phosphorylated on five closely spaced residues, preventing it from interacting with chromatin, likely by interfering with its ability to bind DNA. Under these conditions, expression is increased for CDC2, a homolog of the cyclin dependent kinases responsible for histone H1 phosphorylation, possibly creating a positive feedback loop that promotes the cell cycle. During starvation conditions, Hho1p is dephosphorylated, allowing it to bind to chromatin. This stimulates the expression of some genes, including ngoA, and protease genes such as CYP1, while inhibiting expression of other genes, such as CDC2. This decrease in CDC2 expression may be responsible for cell cycle arrest during starvation.
Associated Literature
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