Epigenetic alterations of a DNMT3B-mutant ICF patient at base-pair resolution
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ABSTRACT:
ORGANISM(S): Homo sapiens
PROVIDER: GSE37578 | GEO | 2012/04/26
SECONDARY ACCESSION(S): PRJNA162293
REPOSITORIES: GEO
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Project description:The immunodeficiency, centromere instability and facial anomalies (ICF) syndrome is associated with mutation of the DNA methyl-transferase DNMT3B, resulting in a reduction of enzyme activity. Aberrant expression of immune system genes and hypomethylation of pericentromeric regions accompanied by chromosomal instability were determined as alterations driving the disease phenotype. However, so far only technologies capable of analyzing single loci were applied to determine epigenetic alterations in ICF patients. In the current study, we performed whole-genome bisulphite sequencing to assess alteration in DNA methylation at base-pair resolution. Whole-genome bisulphite sequencing was performed to assess alteration in DNA methylation of one ICF patient and one healthy control sample at base-pair resolution.
2012-04-25 | E-GEOD-37578 | biostudies-arrayexpress
Project description:Genome-wide DNA methylation patterns are established and maintained by the coordinated action of three DNA methyltransferases, DNMT1, DNMT3A, and DNMT3B. DNMT3B hypomorphic germline mutations are responsible for two-thirds of Immunodeficiency, Centromere Instability, Facial Anomalies (ICF) syndrome cases. The molecular defects in transcription, DNA methylation, and chromatin structure in ICF cells remain relatively uncharacterized. We used expressing microarrays to define the global program of gene expression to elucidate the role of DNMT3B in these processes using EBV-immortalized lymphoblastoid cell lines (LCLs) derived from ICF syndrome and normal individuals. Keywords: disease-state analysis
2007-11-01 | GSE9499 | GEO
Project description:Immunodeficiency, centromeric instability and facial anomalies syndrome (ICF) is a rare autosomal recessive disease, characterized by severe hypomethylation in pericentromeric regions of chromosomes (1, 16 and 9), marked immunodeficiency and facial anomalies. The majority of ICF patients present mutations in the DNMT3B gene, affecting the DNA methyltransferase activity of the protein. In the present study, we have used the Infinium 450K DNA methylation array to evaluate the methylation level of 450,000 CpGs in lymphoblastoid cell lines and untrasformed fibroblasts derived from ICF patients and healthy donors. Our results demonstrate that ICF-specific DNMT3B variants A603T/STP807ins and V699G/R54X cause global DNA hypomethylation compared to wild-type protein. We identified 181 novel differentially methylated positions (DMPs) including subtelomeric and intrachromosomic regions, outside the classical ICF-related pericentromeric hypomethylated positions. Interestingly, these sites were mainly located in intergenic regions and inside the CpG islands. Among the identified hypomethylated CpG-island associated genes, we confirmed the overexpression of three selected genes, BOLL, SYCP2 and NCRNA00221, in ICF compared to healthy controls, which are normally expressed in germ line and silenced in somatic tissues. In conclusion, this study contributes in clarifying the direct relationship between DNA methylation defect and gene expression impairment in ICF syndrome, identifying novel direct target genes of DNMT3B. A high percentage of the DMPs are located in the subtelomeric regions, indicating a specific role of DNMT3B in methylating these chromosomal sites. Therefore, we provide further evidence that hypomethylation in specific non-pericentromeric regions of chromosomes might be involved in the molecular pathogenesis of ICF syndrome. The detection of DNA hypomethylation at BOLL, SYCP2 and NCRNA00221 may pave the way for the development of specific clinical biomarkers with the aim to facilitate the identification of ICF patients.
2016-05-02 | GSE68747 | GEO
Project description:Genome-wide DNA methylation patterns are established and maintained by the coordinated action of three DNA methyltransferases, DNMT1, DNMT3A, and DNMT3B. DNMT3B hypomorphic germline mutations are responsible for two-thirds of Immunodeficiency, Centromere Instability, Facial Anomalies (ICF) syndrome cases. The molecular defects in transcription, DNA methylation, and chromatin structure in ICF cells remain relatively uncharacterized. We used expressing microarrays to define the global program of gene expression to elucidate the role of DNMT3B in these processes using EBV-immortalized lymphoblastoid cell lines (LCLs) derived from ICF syndrome and normal individuals. Experiment Overall Design: 5 Normal LCLs (GM08729, GM08728, LCL1, CM304 and CM774) and 3 ICF LCLs (4088,GM08714 and 10759) were selected for RNA extraction and hybridization on Affymetrix UU133A/B microarrays.
2008-06-16 | E-GEOD-9499 | biostudies-arrayexpress
Project description:ICF syndrome, a rare autosomal recessive disorder characterized by immunodeficiency, centromeric instability and facial anomalies, is caused by mutations in DNMT3B, ZBTB24, CDCA7 or HELLS. In this study we show that mice deficient for Zbtb24 in the hematopoietic lineage exhibit a phenotype that recapitulates major clinical features of ICF patients, including hypogammaglobulinemia. RNA-Seq analysis of splenic follicular B cells and marginal zone B cells identifies dozens of genes that show differential expression in the absence of Zbtb24. These include Cdca7, Taf6, Cdc40, Ostc, Crisp3 and Il5ra.
2021-10-16 | GSE184699 | GEO
Project description:The autosomal recessive immunodeficiency, centromeric instability and facial anomalies (ICF) syndrome is a genetically heterogeneous disorder. Despite recent successes in the identification of the underlying gene defects, it is currently unclear how mutations in any of the four known ICF genes cause a primary immunodeficiency. Here we demonstrate that loss of ZBTB24 in B cells from ICF2 patients impairs non-homologous end-joining (NHEJ) during immunoglobulin class-switch recombination and consequently impairs immunoglobulin production and subtype balance. Mechanistically, we found that ZBTB24 associates with poly(ADP-ribose) polymerase 1 (PARP1) and stimulates auto-poly(ADP-ribosyl)ation of this enzyme. The zinc finger in ZBTB24 binds PARP1-associated poly(ADP-ribose) chains and mediates the PARP1-dependent recruitment of ZBTB24 to DNA breaks. Moreover, by binding to poly(ADP-ribose) chains ZBTB24 protects these moieties from degradation by poly(ADP-ribose) glycohydrolase (PARG). This enhances the poly(ADP-ribose)-dependent interaction between PARP1 and the LIG4/XRCC4 NHEJ complex and promotes NHEJ by facilitating the assembly of this repair complex at DNA breaks. Thus, we uncover ZBTB24 as a regulator of PARP1-dependent NHEJ and class-switch recombination, providing a molecular basis for the immunodeficiency in ICF syndrome.
2020-08-19 | PXD014741 | Pride
Project description:Dysfunction of DNA methyltransferase 3b (DNMT3b) causes centromere instability but the underlying mechanism is unclear. We found that enforced expression of RNase H1 that removes R-loops, nucleic structures comprising an DNA-RNA hybrid, was sufficient to abolish DNA double-strand breaks (DSBs) at (peri-)centromeric sites in immunodeficiency-centromeric instability-facial anomalies (ICF) patient cells carrying DNMT3b mutation. However, ICF cells had lower steady-state level of centromeric R-loops than normal cells. Simultaneous knockdown of two DNA endonucleases, XPG and XPF, restored centromeric R-loops in ICF cells while reducing DSBs and chromosome segregation error. This suggests that (peri-)centromeric R-loops are more vulnerable to XPG or XPF in ICF cells, thus increasing centromeric breaks. This mechanism is recapitulated in DNMT3b-knockout HCT116 cells. Moreover, we present evidence for the choice of alternative end-joining (alt-EJ) repair of (peri-)centromeric breaks in ICF cells. Thus, DNA cleavages of (peri-)centromeric R-loops and mutagenic alt-EJ repair undermine centromere stability in DNMT3b defective cells.
2022-06-12 | GSE142376 | GEO
Project description:Immunodeficiency, Centromeric Instability, and Facial Anomalies Type I (ICF1) Syndrome is a rare genetic disease caused by mutations in DNMT3B, a de novo DNA methyltransferase. However, the molecular basis of how DNMT3B-deficiency leads to ICF1 pathogenesis is unclear. Induced pluripotent stem cell (iPSC) technology facilitates the study of early human developmental diseases via facile in vitro paradigms. Here, we generate iPSCs from ICF Type 1 Syndrome patient fibroblasts followed by directed differentiation of ICF1-iPSCs to mesenchymal stem cells (MSCs). By performing genome-scale bisulfite sequencing, we find that DNMT3B-deficient iPSCs exhibit global loss of non-CG methylation and select CG hypomethylation at gene promoters and enhancers. Further unbiased scanning of ICF1 iPSC methylomes also identifies large megabase regions of CG hypomethylation typically localized in centromeric and subtelomeric regions. RNA sequencing of ICF1 and control iPSCs reveals abnormal gene expression in ICF1 iPSCs relevant to ICF Syndrome phenotypes, some directly associated with promoter or enhancer hypomethylation. Upon differentiation of ICF1 iPSCs to mesenchymal stem cells (MSCs), we find virtually all CG hypomethylated regions remained hypomethylated when compared to either wild-type iPSC-derived MSCs or primary bone-marrow MSCs. Collectively, our results show specific methylome and transcriptome defects in both ICF1-iPSCs and differentiated somatic cell lineages, providing a valuable stem cell system for further in vitro study of the molecular pathogenesis of ICF1 Syndrome. MethylC-seq and RNA-Seq in ICF Syndrome patient fibroblast derived induced pluripotent stem cells.
2014-11-17 | E-GEOD-46030 | biostudies-arrayexpress
Project description:The correct establishment of DNA methylation patterns is vital for mammalian development and is achieved by the de novo DNA methyltransferases DNMT3A and DNMT3B. DNMT3B localises to H3K36me3 at actively transcribing gene bodies through its PWWP domain. It also functions at heterochromatin through an unknown recruitment mechanism. Here we find that knockout of DNMT3B causes losses of methylation predominantly at H3K9me3-marked heterochromatin and that DNMT3B PWWP domain mutations or deletion result in striking increases of methylation in H3K9me3-marked heterochromatin. Removal of the N-terminal region of DNMT3B affects its ability to methylate H3K9me3-marked regions. This region of DNMT3B directly interacts with HP1-alpha and facilitates the bridging of DNMT3B with H3K9me3-marked nucleosomes in vitro. Our results suggest that DNMT3B is recruited to H3K9me3 marked heterochromatin in a PWWP-independent manner that is facilitated by the protein's N-terminus through an interaction with a key heterochromatin protein. More generally, we suggest that DNMT3B plays a role in DNA methylation homeostasis at heterochromatin, a process which is disrupted in cancer, aging and Immunodeficiency, Centromeric Instability and Facial Anomalies (ICF) syndrome.
2024-01-22 | GSE244516 | GEO
Project description:The correct establishment of DNA methylation patterns is vital for mammalian development and is achieved by the de novo DNA methyltransferases DNMT3A and DNMT3B. DNMT3B localises to H3K36me3 at actively transcribing gene bodies through its PWWP domain. It also functions at heterochromatin through an unknown recruitment mechanism. Here we find that knockout of DNMT3B causes losses of methylation predominantly at H3K9me3-marked heterochromatin and that DNMT3B PWWP domain mutations or deletion result in striking increases of methylation in H3K9me3-marked heterochromatin. Removal of the N-terminal region of DNMT3B affects its ability to methylate H3K9me3-marked regions. This region of DNMT3B directly interacts with HP1-alpha and facilitates the bridging of DNMT3B with H3K9me3-marked nucleosomes in vitro. Our results suggest that DNMT3B is recruited to H3K9me3 marked heterochromatin in a PWWP-independent manner that is facilitated by the protein's N-terminus through an interaction with a key heterochromatin protein. More generally, we suggest that DNMT3B plays a role in DNA methylation homeostasis at heterochromatin, a process which is disrupted in cancer, aging and Immunodeficiency, Centromeric Instability and Facial Anomalies (ICF) syndrome.
2024-01-22 | GSE244517 | GEO