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TFEB-induced gene expression, 5hmC and 5mC changes in AML cells

ABSTRACT: TFEB-induced gene expression, 5hmC and 5mC changes in AML cells

PROVIDER: PRJNA548508 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR9277520_1.fastq.gz	Fastqsanger.gz
	SRR9277520_2.fastq.gz	Fastqsanger.gz
	SRR9277530_1.fastq.gz	Fastqsanger.gz
	SRR9277530_2.fastq.gz	Fastqsanger.gz
	SRR9277540_1.fastq.gz	Fastqsanger.gz

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Mutating Zta (182N) changes sequence specific DNA binding (5mC + 5hmC)

Project description:The Epstein-Barr virus (EBV) bZIP transcription factor (TF) Zta is a sequence-specific DNA binding protein that recognizes both unmethylated and methylated DNA. To study the contribution of the conserved N182 amino acid to sequence specific Zta DNA binding, we replaced it with five other amino acids: serine (S), glutamine (Q), threonine (T), isoleucine (I), or valine (V). We used protein binding microarrays (PBMs) to evaluate sequence-specific DNA binding to four types of double-stranded DNA: 1) DNA with cytosine in both strands (DNA(C|C), 2) DNA with 5-methylcytosine (5mC, M) in one strand and cytosine in the second strand (DNA(5mC|C)), 3) DNA with 5-hydroxymethylcytosine (5hmC, H) in one strand and cytosine in the second strand (DNA(5hmC|C)), and 4) DNA with methylated cytosine in both strands in all CG dinucleotides (DNA(5mCG)). With unmethylated DNA, Zta(N182S) binds variants of the consensus TRE (TGA-G/C-TCA) motif, such as TGA-G/C-TGA and TCA-G/C-TGA where C at position 3 is replaced with G in one or both half sites of the motif. Zta(N182S) also binds stronger to DNAs containing modified cytosines compared to wildtype. Zta(N182Q) binds new sequences containing GTAA with DNA(C|C), DNA(5mC|C) and DNA(5hmC|C) where C at position 3 is replaced with A. Zta(N182I) and Zta(N182V) bind sequence specifically to DNA(5mC|C), and weakly with all other types of DNA examined. Zta(N182T) DNA binding is weaker to all types of DNA examined. Our data highlight that mutation of ZtaN182 with the hydrophilic amino acids serine and glutamine alters Zta sequence specific DNA binding, while mutation with hydrophobic amino acids (I and V) increases binding to DNA(5mC|C).

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Project description:The TET family of dioxygenases catalyze conversion of 5-methylcytosine (5mC) to 5-hydroxymethylcytosine (5hmC), but their involvement in establishing normal 5mC patterns during mammalian development and their contributions to aberrant control of 5mC during cellular transformation remains largely unknown. We depleted TET1, TET2, and TET3 by siRNA in a pluripotent embryonic carcinoma cell model and examined the impact on genome-wide 5mC and 5hmC patterns. TET1 depletion yielded widespread reduction of 5hmC, while depletion of TET2 and TET3 reduced 5hmC at a subset of TET1 targets suggesting functional co-dependence. TET2 or TET3-depletion also caused increased 5hmC, suggesting they play a major role in 5hmC removal. All TETs prevent hypermethylation throughout the genome, a finding dramatically illustrated in CpG island shores, where TET depletion resulted in prolific hypermethylation. Surprisingly, TETs also promote methylation, as hypomethylation was associated with 5hmC reduction. TET function was highly specific to chromatin environment: 5hmC maintenance by all TETs occurred at polycomb-marked chromatin and genes expressed at moderate levels; 5hmC removal by TET2 is associated with highly transcribed genes enriched for H3K4me3 and H3K36me3. Importantly, genes prone to hypermethylation in cancer become depleted of 5hmC with TET deficiency, suggesting the TETs normally promote 5hmC at these loci, and all three TETs are required for 5hmC enrichment at enhancers, a condition necessary for expression of adjacent genes. These results provide novel insight into the division of labor among TET proteins and reveal an important connection of TET activity with chromatin landscape and gene expression. Affymetrix gene expression Human ST1.0 microarray of NCCIT human embryonic carcinoma cells (4 samples in duplicate).

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