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The histone demethylase PHF8 is essential for cytoskeleton dynamics

ABSTRACT: PHF8 is a histone demethylase associated with X-linked mental retardation (XLMR). It has been described as a transcriptional coactivator involved in cell cycle progression, but its physiological role is still poorly understood. Here we show that PHF8 controls the expression of genes involved in cell adhesion and cytoskeleton organization such as RhoA, Rac1 and GSK3β. A lack of PHF8 not only results in a cell cycle delay but also in a disorganized actin cytoskeleton and impaired cell adhesion. Our data demonstrate that PHF8 directly regulates the expression of these genes by demethylating H4K20me1 at promoters. Moreover, c-Myc transcription factor interacts with PHF8 and binds to the analyzed promoters, suggesting that c-Myc is involved on PHF8 recruitment to these promoters. Further analysis in the neuroblastoma cell line SH-SY5Y and in cortical neurons shows that depletion of PHF8 results in deficient neurite elongation. Overall, our results suggest that the mental retardation phenotype associated with loss of function of PHF8 could be due to abnormal neuronal connections as a result of alterations in cytoskeleton function.

ORGANISM(S): Homo sapiens

PROVIDER: GSE38175 | GEO | 2012/08/01

SECONDARY ACCESSION(S): PRJNA167332

REPOSITORIES: GEO

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The histone demethylase PHF8 is essential for cytoskeleton dynamics

Project description:PHF8 is a histone demethylase associated with X-linked mental retardation (XLMR). It has been described as a transcriptional coactivator involved in cell cycle progression, but its physiological role is still poorly understood. Here we show that PHF8 controls the expression of genes involved in cell adhesion and cytoskeleton organization such as RhoA, Rac1 and GSK3M-NM-2. A lack of PHF8 not only results in a cell cycle delay but also in a disorganized actin cytoskeleton and impaired cell adhesion. Our data demonstrate that PHF8 directly regulates the expression of these genes by demethylating H4K20me1 at promoters. Moreover, c-Myc transcription factor interacts with PHF8 and binds to the analyzed promoters, suggesting that c-Myc is involved on PHF8 recruitment to these promoters. Further analysis in the neuroblastoma cell line SH-SY5Y and in cortical neurons shows that depletion of PHF8 results in deficient neurite elongation. Overall, our results suggest that the mental retardation phenotype associated with loss of function of PHF8 could be due to abnormal neuronal connections as a result of alterations in cytoskeleton function. HeLa cells were transfected with either control or PHF8 siRNAs. Experiments were performed in biological triplicates. RNA were extracted and sujected to microarray analysis.

2012-07-31 | E-GEOD-38175 | biostudies-arrayexpress

The mental retardation gene PHF8 mediates histone H4K20/H3K9 demethylation and regulates zebrafish brain apoptosis and craniofacial development: expression analysis

Project description:PHF8 (PHD Finger 8) mutations have been found in patients with X-linked mental retardation (XLMR) and craniofacial deformities. Here we identify PHF8 as the first enzyme that mediates demethylation of mono-methylated histone H4 lysine (K) 20 (H4K20me1), with additional activities towards H3K9me2/1 and H3K27me2. Patient mutations significantly compromise the demethylase activity, indicating functional importance. ChIP-seq identified PHF8 near the transcription start sites (TSS) of over 7000 target genes as well as in gene bodies and intergenic regions. PHF8 depletion resulted in up-regulation of H4K20me1 and H3K9me1 at the TSS-associated sites, and H3K9me2 in the gene bodies and intergenic regions, respectively, demonstrating differential substrate specificities at different target genomic locations. PHF8 depletion at the TSS results in decreased target gene expression, which is coincident with increased occupancy of the protein L3MBTL1 previously shown to induce chromatin compaction via binding to lower methyl states including H4K20me1 and H3K9me1. PHF8 RNAi and control RNAi stable HeLa cell lines were established. RNA were isolated from triplicate cell cultures. RNAs were subject to microarray expression analysis. Hybridizations were performed in duplicate.

2010-07-14 | E-GEOD-21555 | biostudies-arrayexpress

The mental retardation gene PHF8 mediates histone H4K20/H3K9 demethylation and regulates zebrafish brain apoptosis and craniofacial development: ChIP-Seq analysis

2010-07-14 | GSE21108 | GEO

The mental retardation gene PHF8 mediates histone H4K20/H3K9 demethylation and regulates zebrafish brain apoptosis and craniofacial development: expression analysis

2010-07-14 | GSE21555 | GEO

The mental retardation gene PHF8 mediates histone H4K20/H3K9 demethylation and regulates zebrafish brain apoptosis and craniofacial development: ChIP-Seq analysis

Project description:PHF8 (PHD Finger 8) mutations have been found in patients with X-linked mental retardation (XLMR) and craniofacial deformities. Here we identify PHF8 as the first enzyme that mediates demethylation of mono-methylated histone H4 lysine (K) 20 (H4K20me1), with additional activities towards H3K9me2/1 and H3K27me2. Patient mutations significantly compromise the demethylase activity, indicating functional importance. ChIP-seq identified PHF8 near the transcription start sites (TSS) of over 7000 target genes as well as in gene bodies and intergenic regions. PHF8 depletion resulted in up-regulation of H4K20me1 and H3K9me1 at the TSS-associated sites, and H3K9me2 in the gene bodies and intergenic regions, respectively, demonstrating differential substrate specificities at different target genomic locations. PHF8 depletion at the TSS results in decreased target gene expression, which is coincident with increased occupancy of the protein L3MBTL1 previously shown to induce chromatin compaction via binding to lower methyl states including H4K20me1 and H3K9me1. HeLa cells stably expressing control and PHF8 shRNA were used to profile the histone modifications including H4K20me1, H3K9me1 and 2 by ChIP-seq. For PHF8 ChIP-seq, chromatin was obtained by formaldehyde cross-link and sonication. For chIP-seq of Histone modifcation, chromatin was prepared by MNase digestion to obtain mono-nucleosomes.

2010-07-14 | E-GEOD-21108 | biostudies-arrayexpress

X chromosome-specific Array-CGH of XLMR patient

Project description:Mental retardation (MR) is a non-progressive cognitive impairment affecting 2 to 3% of the Western population. So far, point mutations and subtle deletions and insertions have been shown to represent only a proportion (<40%) of genetic causes underlying X-linked mental retardation (XLMR). We have screened a subset of 300 presumable X-linked families by X chromosome-specific array-CGH and identified 6 families with overlapping microduplications at Xp11.22 containing two candidate genes; both of which showed overexpression in the affected individuals. Array-CGH data revealed aberrant Cy5/Cy3 log2 ratios for different but overlapping sets of clones indicating varying sizes of these duplications in the different families. Keywords: comparative genomic hybridization

2008-02-20 | GSE9143 | GEO

A gene expression fingerprint in mental retardation reflects disease causing defects in the histone demethylase KDM5

Project description:Mutations in KDM5C, (previously named SMCX or JARID1C) a gene that encodes a transcriptional regulator with histone-demethylase activity specific for di- and tri-methylated H3K4, are a comparatively frequent cause of non-syndromic X-linked mental retardation (NS-XLMR). Specific transcriptional targets of KDM5C, however, are still unknown and the effects of KDM5C deficiency on gene expression have not yet been investigated. Here we present the results of gene expression profiling performed on lymphoblastoid cell lines as well as blood from patients with mutations in KDM5C. Using whole genome expression arrays and QRT-PCR we identified several genes, including CMKOR1, JARID1B and KIAA0469 that were consistently deregulated in both tissues. These findings shed light on the patho-mechanisms underlying mental retardation and may have implications for future diagnostics of this heterogeneous disorder.

2009-07-29 | GSE17369 | GEO

A gene expression fingerprint in mental retardation reflects disease causing defects in the histone demethylase KDM5

2010-08-19 | E-GEOD-17369 | biostudies-arrayexpress

Homo sapiens

Project description:Mental Retardation Patients

| PRJNA120323 | ENA

PHF8 targets histone methylation and RNA polymerase II to activate transcription

Project description:Mutations in PHF8 are associated with X-linked mental retardationand cleft lip/cleft palate. PHF8 contains a plant homeodomain(PHD) in its N-terminus and is member of a family of JmjC-domaincontaining proteins. While PHDs can act as methyl lysine recognitionmotifs, JmjC-domains can catalyze lysine demethylation. Here,we show that PHF8 is a histone demethylase that removes repressivehistone H3 dimethyl lysine 9 marks. Our biochemical analysisrevealed specific association of the PHF8 PHD domain with histoneH3 trimethylated at lysine 4 (H3K4me3). Chromatin-immunoprecipitationfollowed by high throughput sequencing indicated that PHF8 isenriched at transcription start sites of many active or poisedgenes, mirroring the presence of RNA polymerase II (RNAPII)and of H3K4me3-bearing nucleosomes. We show that PHF8 can actas a transcriptional co-activator and its activation functionlargely depends on binding of the PHD to H3K4me3. Furthermore,we present evidence for direct interaction of PHF8 with theC-terminal domain of RNAPII. Importantly, a PHF8 disease mutantis defective in demethylation and in co-activation. This isthe first demonstration of a chromatin-modifying enzyme whichis globally recruited to promoters through its association withH3K4me3 and RNAPII. This SuperSeries is composed of the following subset Series: GSE20563: Knockdown of PHF8 in HeLa S3 cells GSE20725: ChIP-Seq of PHF8 and H3K4me3 Refer to individual Series

2010-04-26 | E-GEOD-20753 | biostudies-arrayexpress

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