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BTG1 and BTG2 Regulate B Linege Commitment by Modulation of EBF1 Activity

ABSTRACT: The human BTG1 and BTG2 genes are targeted by genetic alterations in hematological malignancies. In this study we examined the unique and overlapping functions of Btg1 and Btg2 in mouse B cell development. Mice deficient for Btg1 and Btg2 displayed the strongest phenotype with a decrease in B cell numbers in bone marrow due to impaired B cell commitment and immature B cell differentiation. To determine the underlying mechanism, microarray expression analyis was performed on early (B220+ CD43+) and late (B220+ CD43-) B cells of WT and Btg1;Btg2 dKO mice.

ORGANISM(S): Mus musculus

PROVIDER: GSE55997 | GEO | 2014/03/19

SECONDARY ACCESSION(S): PRJNA242137

REPOSITORIES: GEO

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BTG1 and BTG2 Regulate B Linege Commitment by Modulation of EBF1 Activity

Project description:The human BTG1 and BTG2 genes are targeted by genetic alterations in hematological malignancies. In this study we examined the unique and overlapping functions of Btg1 and Btg2 in mouse B cell development. Mice deficient for Btg1 and Btg2 displayed the strongest phenotype with a decrease in B cell numbers in bone marrow due to impaired B cell commitment and immature B cell differentiation. To determine the underlying mechanism, microarray expression analyis was performed on early (B220+ CD43+) and late (B220+ CD43-) B cells of WT and Btg1;Btg2 dKO mice. Total RNA obtained from sorted B220+ CD43+ ( Hardy fractions ABC) and B220+ CD43- (Hardy fractions DEF) BM cells of WT and Btg1-/-;Btg2-/- mice. In total 4 samples were analyzed and no replicates were included.

2014-03-19 | E-GEOD-55997 | biostudies-arrayexpress

RNAseq of cultured neonatal rat ventricular cardiomyocytes treated with siRNA for Btg1 and Btg2 knockdown.

Project description:Total RNA was isolated from n=3 culture wells per siRNA treatment group, from 6 independent primary neonatal rat cardiomyocyte isolations. RNA was pooled to obtain n=3 independent samples per siRNA treatment group for sequencing. The siRNA treatment groups were= siScr (Scramble control), siBtg12 (Btg1/Btg2 double knockdown), siBtg1 (Btg1 single knockdown), siBtg2 (Btg2 single knockdown).

2023-05-24 | GSE203493 | GEO

mRNA destabilization by BTG1 and BTG2 maintains T cell quiescence [mTAIL-seq]

Project description:Quiescence is a cellular state in which cells undergo reversible cell cycle arrest in response to environmental challenges or lack of stimuli. When favourable conditions are engaged, the cells exit quiescence and start to proliferate. For example, quiescent stem cells and oocytes are activated by differentiation signals and fertilization, respectively. The regulation of quiescent state is also crucial for lymphocytes, such as T cells. Inappropriate activation of T cells often leads to autoimmune diseases and thus, the balance between quiescent and activated T cells must be preserved. Despite its importance, however, how T cells maintain the ‘quiescent state’ and exit from it remain largely unknown. Here, we identify BTG1 and BTG2 (BTG1/2) as factors responsible for T cell quiescence. Knockout of Btg1/2 in T cells resulted in a reduced threshold to T cell activation, increased proliferation and a concomitant reduction of the frequency of naive T cells. Loss of BTG1/2 rendered naive T cells to become spontaneously activated even without TCR stimuli. Interestingly, we found a global increase in mRNA abundance in naive T cells that lack BTG1/2. In addition, depletion of BTG1/2 led to an increase in mRNA half-life and poly(A) tail length. Thus, BTG1/2 promotes deadenylation and degradation of mRNA in naive T cells. Our study demonstrates a key mechanism underlying T cell quiescence, and suggests low mRNA abundance as a key feature for maintaining quiescent T cells.

2020-01-31 | GSE125889 | GEO

mRNA destabilization by BTG1 and BTG2 maintains T cell quiescence [RNA-seq]

Project description:Quiescence is a cellular state in which cells undergo reversible cell cycle arrest in response to environmental challenges or lack of stimuli. When favorable conditions are engaged, the cells exit quiescence and start to proliferate. For example, quiescent stem cells and oocytes are activated by differentiation signals and fertilization, respectively. The regulation of quiescent state is also crucial for lymphocytes, such as T cells. Inappropriate activation of T cells often leads to autoimmune diseases and thus, the balance between quiescent and activated T cells must be preserved. Despite its importance, however, how T cells maintain the ‘quiescent state’ and exit from it remain largely unknown. Here, we identify BTG1 and BTG2 (BTG1/2) as factors responsible for T cell quiescence. Knockout of Btg1/2 in T cells resulted in a reduced threshold to T cell activation, increased proliferation and a concomitant reduction of the frequency of naive T cells. Loss of BTG1/2 rendered naive T cells to become spontaneously activated even without TCR stimuli. Interestingly, we found a global increase in mRNA abundance in naive T cells that lack BTG1/2. In addition, depletion of BTG1/2 led to an increase in mRNA half-life and poly(A) tail length. Thus, BTG1/2 promotes deadenylation and degradation of mRNA in naive T cells. Our study demonstrates a key mechanism underlying T cell quiescence, and suggests low mRNA abundance as a key feature for maintaining quiescent T cells.

2020-01-31 | GSE125865 | GEO

mRNA destabilization by BTG1 and BTG2 maintains T cell quiescence

Project description:mRNA destabilization by BTG1 and BTG2 maintains T cell quiescence

| PRJNA517898 | ENA

mRNA destabilization by BTG1 and BTG2 maintains T cell quiescence [mTAIL-seq]

Project description:mRNA destabilization by BTG1 and BTG2 maintains T cell quiescence [mTAIL-seq]

| PRJNA517899 | ENA

mRNA destabilization by BTG1 and BTG2 maintains T cell quiescence [RNA-seq]

Project description:mRNA destabilization by BTG1 and BTG2 maintains T cell quiescence [RNA-seq]

| PRJNA517726 | ENA

RNAseq of cultured neonatal rat ventricular cardiomyocytes treated with siRNA for Btg1 and Btg2 knockdown.

Project description:RNAseq of cultured neonatal rat ventricular cardiomyocytes treated with siRNA for Btg1 and Btg2 knockdown.

| PRJNA840946 | ENA

BTG1 regulates glucocorticoid receptor autoinduction in acute lymphoblastic leukemia

Project description:RNAi mediated knockdown of BTG1 in the acute lymphoblastic cell line RS4;11 causes this cell line to become resistant to prednisolone treatment when compared to control cells. In this experiment we treated BTG1 knockdown RS4;11 cells and control RS4;11 cells either with prednisolone or a vehicle control and compared the gene expression patterns of these cell lines. 8 samples were analyzed: we treated RS4;11 control or RS4;11 shRNA BTG1 cells with either prednisolone or vehicle control, the experiment was performed in duplicate. Genes with a > 2-fold change in expression after prednisolone treatment when compared to vehicle treatment were selected. Expression changes in BTG1 knockdown cells were compared to those in control vector transduced cells.

2010-06-23 | E-GEOD-18027 | biostudies-arrayexpress

BTG1 mutation yields super-competitive B cells primed for malignant transformation

Project description:Mutations in the BTG1 tumor suppressor gene are exclusive to germinal center (GC)-derived B cell lymphomas and associate with low clinical outcome. To elucidate the effect of BTG1 mutations in mature B cells, we generated a mouse model for the conditional expression of mutant Btg1 Unlike conventional lymphoma oncogenes, mutated Btg1 expression in B cells did not induce GC hyperplasia. However, placing mutant and wild-type GC B cells in direct competition revealed that mutant Btg1 provides a massive advantage during the GC reaction. Furthermore, mutant Btg1 accelerates and dramatically increases the aggressiveness of BCL2-driven lymphomas in vivo. NGS, cellular and molecular profiling showed activation of Myc and mTORC1 anabolic programs in Btg1 mutant GC B cells, murine lymphomas and patient DLBCLs. These programs characterize T cell-selected GC B cells that enter a growth phase prior to clonal burst. We find that mutant Btg1 sensitizes GC B cells to T cell signals, resulting in a lower threshold to Myc activation, through mRNA translational biochemical mechanisms. Together, we link recurrent mutations of BTG1 to a massive fitness gain of GC B cells that confers an agressive and invasive phenotype to B cell lymphomas in vivo and associate with low clinical outcome in patients with agressive DLBCL. This work reveals a fine-tuned metabolic regulatory network that controls normal GC development and can be hijacked by lymphoma cells during disease progression. These findings have implications for fitness processes and natural selection at a broad level by providing fundamental insight into the power of subtle biochemical shifts to enhance biological fitness of cells.

2023-01-24 | GSE167786 | GEO

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