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Non-catalytic Roles of Tet2 Are Essential to Regulate Hematopoietic Stem and Progenitor Cell Homeostasis
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![Figure 1. Generation of Tet2 Catalytic Mutant (Mut) Mouse and Characterization of Its Hematological Phenotypes (A) Tet2 wild-type (WT) and catalytic Mut proteins (top) and alleles (bottom). (B and C) Analysis of the genotypes of Tet2 catalytic Mut mice by RFLP (restriction fragment length polymorphism) (B) and Sanger sequencing (C). (D) Tet2 mRNA levels in Lin−Sca-1+c-Kit+ (LSK) cells of Indicated genotypes quantified by qRT-PCR. Data are normalized to Gapdh. Note the absence of Tet2 mRNA in knockout (KO) but its normal expression in Mut samples. (E) Tet2 protein levels in total bone marrow isolated from 4-month-old mice assessed by western blot. Quantified Tet2 signal intensity normalized to actin signal intensity is shown. Note the absence of Tet2 protein in KO but its normal and comparable expression in Mut and WT samples. (F) Levels of 5hmC in the bone marrow of the indicated genotypes, assessed by dot blot and quantified as average of three separated experiments (relative to WT control samples) (n = 3). (G) Overview of experimental platform using Tet2 WT, Mut, and KO mice. (H) Blood counts of Tet2 Mut and KO mice (4 months old, n = 8). (I) Representative smears of peripheral blood (PB) of 10-month-old Tet2 Mut (ii), Tet2 KO with MDS-like myeloid (iii), and lymphoid (iv) phenotypes and WT control mice (i). Images of representative dysplastic hematopoietic cells found in Tet2 Mut and KO mice are also shown (right; b–j, higher magnification images). Tet2 Mut and KO mice show dysplastic erythroid cells (polychromatophilic, blue arrowhead; Howell-Jolly bodies, black arrowhead; other poikilocytes [e.g., echinocytes], outlined arrowhead; immature erythroid cells, blue-outlined arrowhead). Dysplastic myeloid cells (d and f) and dysplastic platelets (giant platelet, g), as well as immature B cells (black arrows [h and i]) are shown. All images are taken at ×100 magnification. Scale bars, 10 μm. (J) Representative flow data for myeloid and lymphoid lineages in PB from Tet2 Mut mice (middle) and Tet2 KO mice with myeloid and B cell phenotypes (right) (10 months old). Flow data for WT control are also shown (left). (K) Percentages ± SEM of CD11b+ (left), c-Kit+ (middle), and B220lowCD19+CD43+ (in Gr-1−CD4/8− cells, right) cells in the PB in Tet2 Mut (n = 6) and KO (n = 8) mice (10 months old). Error bars indicate SD unless otherwise specified. n.c. stands for no significant change. See also Figure S1.](/paper-figures/70f54f3f7e8345da890629dc09119d1d/non-catalytic-roles-of-tet2-are-essential-to-regulate-hematopoietic-stem-and-figure-1.jpg)


![Figure 4. Gene Expression Profiling of Tet2 Mut and KO HSPCs (A) MA plot of RNA-seq analysis of 2-month-old LSK cells as log2 fold change versus mean gene expression levels. Differentially expressed genes (DEGs) are depicted in red. Mut or KO groups are compared to WT. (B) Heatmap of differentially expressed genes identified by RNA-seq across LSK cells of indicated genotypes. Genes differentially expressed in at least one of the comparisons are displayed. Intensity values are log2 transformed (left) and colors represent relative expression across samples. Venn diagram illustrating the overlap between all DEGs in Tet2-Mut and Tet2-KO LSK cells (right). (C) Selected terms from GO and KEGG analysis of DEGs in LSK cells. Data are plotted with colors for −log10 of p value and bubble sizes for numbers of genes. (D) MA plot of RNA-seq analysis of 2-month-old Lin− cells as log2 fold change versus mean gene expression levels. DEGs are depicted in red (compared to WT). (E) Heatmap (left) of DEGs identified by RNA-seq across Lin− cells of indicated genotypes. Genes differentially expressed in at least one of the comparisons are displayed. Venn diagram illustrating the overlap between all DEGs in Tet2-Mut and Tet2-KO Lin− cells (right). (F) Selected terms from GO and KEGG analysis of DEGs in Lin− cells. Data are plotted with colors for −log10 of p value and bubble sizes for numbers of genes. (G) Comparison of DEGs with Tet2 ChIP-seq peaks in bone marrow, revealing that nearly half of DEGs in LSK cells and approximately one-third of DEGs in Lin− cells are bound by Tet2 (i.e., direct targets of Tet2). Tet2 ChIP-seq data were from a previous study (see STAR Methods) (H) Classification of Tet2 peaks at DEGs revealing that Tet2 binding is enriched at the promoters of Tet2-bound DEGs. (I) Relative expression levels of Hoxa9 and Gata2 mRNA in LSK or Lin− cells from mice of indicated genotypes (compared to WT control samples), quantified by qRT-PCR (n = 3). Data normalized to Gapdh. (J and K) Overexpression of Gata2 in the bone marrow of Tet2 Mut or KO mice with MDS- or CLL-like hematopoietic disorder, respectively, followed by competitive BMT (mixture of test cells [Ly45.2] with competitor [Ly45.1/45.2] in a 1:3 ratio). Percentage of donor-derived cells in PB of recipient mice transplanted 3 weeks after BMT is shown in (J) (n = 4), and the survival curve of transplanted mice is shown in (K) (n = 8, 12, and 10 for WT, Mu, and KO, respectively). (L) Model summarizing the effects of loss of Tet2 versus loss of its catalytic activity alone on myeloid and lymphoid lineage homeostasis and development of malignancies. Error bars indicate SD. n.c. stands for no significant change. See also Figure S4.](/paper-figures/93a5bd7430f4465690c7ef45c3fb92b1/non-catalytic-roles-of-tet2-are-essential-to-regulate-hematopoietic-stem-and-figure-4.jpg)
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“Previous studies show that Gr1 (Ly6c/Ly6g) positive cells expand in Tet2-KO PB8, spleen6, and BM51 upon inflammatory stress or aging and this is defined as aberrant myelopoiesis in response to inflammation7,8,18,52.”
From Clonal hematopoiesis related TET2 loss-of-function impedes IL1β-mediated epigenetic reprogramming in hematopoietic stem and progenitor cells (2023) · cites this paper as [51]
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Citations
Cites
Wang, H., Yang, H., Shivalila, C. S., Dawlaty, M. M., Cheng, A. W., Zhang, F., & Jaenisch, R. (2013) · Cell · doi:10.1016/j.cell.2013.04.025 · Cited by 3,495
Self-citationTet proteins can convert 5-methylcytosine to 5-formylcytosine and 5-carboxylcytosine
Ito, S., Shen, L., Dai, Q., Wu, S. C., Collins, L. B., Swenberg, J. A., He, C., & Zhang, Y. (2011) · Science · doi:10.1126/science.1210597 · Cited by 3,451
Mutation in TET2 in Myeloid Cancers
Delhommeau, F., Dupont, S., Valle, V. D., James, C., Trannoy, S., Massé, A., Kosmider, O., Le Couedic, J.-P., Robert, F., Alberdi, A., et al. (2009) · New England Journal of Medicine · doi:10.1056/nejmoa0810069 · Cited by 1,776
Tet2 loss leads to increased hematopoietic stem cell self-renewal and myeloid transformation
Moran-Crusio, K., Reavie, L., Shih, A., Abdel-Wahab, O., Ndiaye-Lobry, D., Lobry, C., Figueroa, M. E., Vasanthakumar, A., Patel, J., Zhao, X., et al. (2011) · Cancer Cell · doi:10.1016/j.ccr.2011.06.001 · Cited by 1,339
Genetic and functional drivers of diffuse large B cell lymphoma
Reddy, A., Zhang, J., Davis, N. S., Moffitt, A. B., Love, C. L., Waldrop, A., Leppa, S., Pasanen, A., Meriranta, L., Karjalainen-Lindsberg, M.-L., et al. (2017) · Cell · doi:10.1016/j.cell.2017.09.027 · Cited by 1,104
TET1 and hydroxymethylcytosine in transcription and DNA methylation fidelity
Williams, K., Christensen, J., Pedersen, M. T., Johansen, J. V., Cloos, P. A. C., Rappsilber, J., & Helin, K. (2011) · Nature · doi:10.1038/nature10066 · Cited by 1,021
Tet2 is required to resolve inflammation by recruiting Hdac2 to specifically repress IL-6
Zhang, Q., Zhao, K., Shen, Q., Han, Y., Gu, Y., Li, X., Zhao, D., Liu, Y., Wang, C., Zhang, X., et al. (2015) · Nature · doi:10.1038/nature15252 · Cited by 807
Ascorbate regulates haematopoietic stem cell function and leukaemogenesis
Agathocleous, M., Meacham, C. E., Burgess, R. J., Piskounova, E., Zhao, Z., Crane, G. M., Cowin, B. L., Bruner, E., Murphy, M. M., Chen, W., et al. (2017) · Nature · doi:10.1038/nature23876 · Cited by 545 · cited 1×
“Likewise, vitamin C (which boosts TET enzymatic activity) has been shown to be of therapeutic benefit in MDS and CMML disease in mice haploinsufficient for Tet2 (Agathocleous et al., 2017; Cimmino et al., 2017).”
BackgroundTet2 loss leads to hypermutagenicity in haematopoietic stem/progenitor cells
Pan, F., Wingo, T. S., Zhao, Z., Gao, R., Makishima, H., Qu, G., Lin, L., Yu, M., Ortega, J. R., Wang, J., et al. (2017) · Nature Communications · doi:10.1038/ncomms15102 · Cited by 117
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Cited by
McClatchy, J., Strogantsev, R., Wolfe, E., Lin, H. Y., Mohammadhosseini, M., Davis, B. A., Eden, C., Goldman, D., Fleming, W. H., Conley, P., et al. (2023) · Nature Communications · doi:10.1038/s41467-023-43697-y · Cited by 95
Metadata
- Authors
- Ito, K., Lee, J., Chrysanthou, S., Zhao, Y., Josephs, K., Sato, H., Teruya-Feldstein, J., Zheng, D., Dawlaty, M. M., & Ito, K.
- Venue
- Cell Reports
- Publisher
- Elsevier BV
- Published
- 2019-09
- Volume
- 28
- Issue
- 10
- Pages
- 2480-2490.e4
- ISSN
- 2211-1247
- PMC
- PMC6750732
- Cited by
- 114
- References
- 9
- Language
- en
- Licence
- Funders
- National Institutes of Health
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