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Ribosomal deficiencies in Diamond-Blackfan anemia impair translation of transcripts essential for differentiation of murine and human erythroblasts

ABSTRACT: Diamond Blackfan Anemia (DBA) is associated with developmental defects and profound anemia. Mutations in genes encoding a ribosomal protein of the small (e.g. Rps19) or large (e.g. Rpl11) ribosomal subunit are found in over half of these patients. The mutations cause ribosomal haploinsufficiency, which reduces overall translation efficiency of cellular mRNAs. We reduced expression of *Rps19* or *Rpl11* in mouse erythroblasts and investigated mRNA polyribosome association, which revealed deregulated translation initiation of specific transcripts. Among these were *Bag1*, encoding a Hsp70 co-chaperone, and *Csde1*, encoding an RNA binding protein, both expressed at increased levels in erythroblasts. Their translation initiation is cap-independent and starts from an internal ribosomal entry site (IRES), which appeared sensitive to knock down of Rps19 or Rpl11. Mouse embryos lacking Bag1 die at embryonic day E13.5 with reduced erythroid colony forming cells in the fetal liver, and low Bag1 expression impairs erythroid differentiation in vitro. Reduced expression of Csde1 impairs proliferation and differentiation of erythroid blasts. Protein but not mRNA expression of *BAG1* and *CSDE1* was reduced in erythroblasts cultured from DBA patients. Our data suggest that impaired IRES-mediated translation of mRNAs expressed at increased levels in erythroblasts contributes to the erythroid phenotype of DBA.

ORGANISM(S): Mus musculus

PROVIDER: GSE22903 | GEO | 2011/11/14

SECONDARY ACCESSION(S): PRJNA127953

REPOSITORIES: GEO

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Ribosomal deficiencies in Diamond-Blackfan anemia impair translation of transcripts essential for differentiation of murine and human erythroblasts

Project description:Diamond Blackfan Anemia (DBA) is associated with developmental defects and profound anemia. Mutations in genes encoding a ribosomal protein of the small (e.g. Rps19) or large (e.g. Rpl11) ribosomal subunit are found in over half of these patients. The mutations cause ribosomal haploinsufficiency, which reduces overall translation efficiency of cellular mRNAs. We reduced expression of *Rps19* or *Rpl11* in mouse erythroblasts and investigated mRNA polyribosome association, which revealed deregulated translation initiation of specific transcripts. Among these were *Bag1*, encoding a Hsp70 co-chaperone, and *Csde1*, encoding an RNA binding protein, both expressed at increased levels in erythroblasts. Their translation initiation is cap-independent and starts from an internal ribosomal entry site (IRES), which appeared sensitive to knock down of Rps19 or Rpl11. Mouse embryos lacking Bag1 die at embryonic day E13.5 with reduced erythroid colony forming cells in the fetal liver, and low Bag1 expression impairs erythroid differentiation in vitro. Reduced expression of Csde1 impairs proliferation and differentiation of erythroid blasts. Protein but not mRNA expression of *BAG1* and *CSDE1* was reduced in erythroblasts cultured from DBA patients. Our data suggest that impaired IRES-mediated translation of mRNAs expressed at increased levels in erythroblasts contributes to the erythroid phenotype of DBA. 3 biological replicates of erythroblasts treated with different shRNA were used for polyribosomal sucrose gradients; RNA was extracted from gradients in 2 samples - mRNA associated with polyribosomes (poly) and the rest (sub).

2011-11-14 | E-GEOD-22903 | biostudies-arrayexpress

Mechanism of action of RPS19R62W mutation in Diamond-Blackfan Anemia (DBA)

Project description:RPS19 mutations are the most common cause of the human disorder Diamond Blackfan Anemia. The R62W mutation was hypothesized to act in a dominant negative fashion and mice expressing RPS19R62W have many of the characteristics of Diamond Blackfan Anemia. Diamond-Blackfan Anemia (DBA), is an inherited erythroblastopenia associated with mutations in at least 8 different ribosomal protein genes. Mutations in the gene encoding Ribosomal Protein S19 (RPS19) have been identified in ~25% of DBA families. Most of these mutations disrupt either the translation or stability of the RPS19 protein and are predicted to cause DBA by haploinsufficiency. However, approximately ~30% of RPS19 mutations are missense mutations that do not alter the stability of the RPS19 protein and are hypothesized to act by a dominant negative mechanism. To formally test this hypothesis, we generated a transgenic mouse model expressing an RPS19 mutation in which an Arginine residue is replaced with a Tryptophan residue at codon 62 (RPS19R62W). Constitutive expression of RPS19R62W in developing mice was lethal. Conditional expression of RPS19R62W resulted in growth retardation, a mild anemia with reduced numbers of erythroid progenitors and significant inhibition of terminal erythroid maturation, similar to DBA. RNA profiling demonstrated over 700 dysregulated genes belonging to the same pathways that are disrupted in RNA profiles of DBA patient cells. The samples compared are RNA extracted from CD71 positive erythroblasts sorted from the bone marrow of wild type mice and mice expressing a mutant RPS19 (RPS19R62W) transgene

2011-06-29 | E-GEOD-22645 | biostudies-arrayexpress

AB001

Project description:Diamond-Blackfan anemia (DBA) is a congenital disorder that results predominantly from mutations in various ribosomal protein genes. In order to determine how these mutations affect the translation of specific mRNAs, we performed microarray analysis of polysomal transcripts isolated from lymphoblast cells derived from DBA patients carrying different haploinsufficient mutations in either RPS19 or RPL11. One of the few overlapping transcripts that we found significantly decreased on the polysomes codes for branched-chain aminotransferase-1 (BCAT-1). We go on to determine that translation of BCAT-1 is especially impaired in cells carrying mutations in the small ribosomal protein genes, and provide evidence that this effect is due to its unusually long 5M-bM-^@M-^YUTR. The BCAT-1 enzyme is critical for synthesis of the branched-chain amino acids, including leucine. It is known that DBA patients respond well to orally administered leucine, and large-scale clinical trials as such are currently underway. Our results suggest that the haploinsufficient loss of ribosomal protein genes results in a decrease of BCAT-1 translation and provide an explanation for why leucine administration is beneficial for DBA patients. In this expression study duplicate mRNA samples were generated from polysomes isolated from celllines with mutations in RPS19 or RPL11 or normal controls. In each group 3 cellines were tested. Duplicate samples were analyzed in dyeswap. As common reference the commercial universal human reference RNA (Stratagene) was used.

2014-01-30 | E-GEOD-43117 | biostudies-arrayexpress

Mechanism of action of RPS19R62W mutation in Diamond-Blackfan Anemia (DBA)

2011-06-29 | GSE22645 | GEO

Partial loss of Rpl11 in adult mice recapitulates Diamond-Blackfan anemia (DBA) and promotes lymphomagenesis

Project description:Diamond-Blackfan anemia (DBA) is characterized by anemia and cancer susceptibility, and is caused by mutations in ribosomal genes, including Rpl11. Here, we report that Rpl11-heterozygous embryos are not viable, and homozygous deletion of Rpl11 in adult mice results in death within a few weeks, accompanied by bone marrow aplasia and intestinal atrophy. Importantly, deletion of a single Rpl11 allele in adult mice results in anemia associated to decreased erythroid progenitors and defective erythroid maturation. These phenotypes are also present in mice transplanted with inducible heterozygous Rpl11 bone marrow, indicating a cell-autonomous role of RPL11 in erythropoiesis. Additionally, fibroblasts lacking one or both Rpl11 alleles show defective p53 activation upon ribosomal stress or DNA damage. Furthermore, fibroblasts and hematopoietic tissues from heterozygous Rpl11 mice present higher basal cMYC levels. Accordingly, heterozygous Rpl11 mice are highly susceptible to radiation-induced lymphomagenesis. We conclude that Rpl11-deficient mice recapitulate DBA disorder, including cancer predisposition. RNAseq profiles of bone marrow hematopoietic progenitors cells from WT (Rpl11+/+:: Tg.UbC-CreERT2) and LOX (Rpl11+/lox::Tb.Ub-CreERT2) mice, n=4 independent animals per genotype

2015-09-01 | E-GEOD-72537 | biostudies-arrayexpress

Partial loss of Rpl11 in adult mice recapitulates Diamond-Blackfan anemia (DBA) and promotes lymphomagenesis

2015-09-01 | GSE72537 | GEO

AB001

Project description:Diamond-Blackfan anemia (DBA) is a congenital disorder that results predominantly from mutations in various ribosomal protein genes. In order to determine how these mutations affect the translation of specific mRNAs, we performed microarray analysis of polysomal transcripts isolated from lymphoblast cells derived from DBA patients carrying different haploinsufficient mutations in either RPS19 or RPL11. One of the few overlapping transcripts that we found significantly decreased on the polysomes codes for branched-chain aminotransferase-1 (BCAT-1). We go on to determine that translation of BCAT-1 is especially impaired in cells carrying mutations in the small ribosomal protein genes, and provide evidence that this effect is due to its unusually long 5’UTR. The BCAT-1 enzyme is critical for synthesis of the branched-chain amino acids, including leucine. It is known that DBA patients respond well to orally administered leucine, and large-scale clinical trials as such are currently underway. Our results suggest that the haploinsufficient loss of ribosomal protein genes results in a decrease of BCAT-1 translation and provide an explanation for why leucine administration is beneficial for DBA patients.

2014-01-30 | GSE43117 | GEO

RNAseq of E14.5 fetal liver isolated from wild-type control, Rps19R67∆/R67∆, Rps19R67∆/R67∆ Trp53−/− and Trp53−/− mutant embryos.

Project description:This RNA sequencing experiment is part of the study \\"Preclinical animal model of Diamond-Blackfan anemia with single amino acid mutation of ribosomal protein Rps19\\". A mouse model with conserved arginine 67 deletion of ribosomal protein Rps19 mutation develops features characteristic of human Diamond-Blackfan anemia, a rare bone marrow failure syndrome, including hematologic dysfunctions, early onset growth delay, intrinsic anemia, severe craniofacial, skeletal, urogenital, cardiovascular, and cerebral abnormalities leading to premature lethality during the adolescence of the mouse. This DBA mouse model exhibits cell intrinsic activation of the Trp53 signaling pathway in hematopoietic stem cells (HSCs) leading to reduced erythroid lineage development that may be rescued after inactivation of the tumor suppressor Trp53. The E14.5 fetal liver transcriptome analysis study confirms the involvement of non-canonical components of the p53 signaling pathway in the etiopathogenesis of DBA, manifested already during fetal development, consistent with the early onset of DBA-like phenotypes in mouse embryos as well as development of the disease in neonatal human patients. These results confirm our previous findings in adult hematopoietic progenitors as well as indicate that the development of DBA occurs well into the fetal development in both humans and our mouse model.

2023-05-31 | E-MTAB-12448 | biostudies-arrayexpress

Analysis of the interactome of RPS19 mutants

Project description:Ribosomal protein S19 (RPS19) is a 16-kDa protein found mainly as a component of the ribosomal 40 S subunit. Its mutations are responsible for Diamond Blackfan anemia, a congenital disease characterized by defective erythroid progenitor maturation. To clarify the function of RPS19, we compare the interactome of RPS19 wilde type and their two mutant proteins: RPS19-R62W and RPS19- R101H. Mutations R62W and R101H impair RPS19 ability to associate with the ribosome. We found striking differences between the interactomes of wild type and mutant RPS19 proteins. In particular, mutations abolish interactions with proteins having splicing, translational and helicase activity, thus confirming the role of RPS19 in RNA processing/metabolism and translational control.

2014-08-11 | PXD000640 | Pride

Csde1 binds transcripts involved in protein homeostasis and controls their expression in erythropoiesis

Project description:The RNA binding protein Csde1 (Cold shock domain protein e1) is strongly upregulated during erythropoiesis, but its expression is reduced in Diamond Blackfan Anemia (DBA). To understand the role of Csde1 in DBA, and the cellular pathways controlled by Csde1 in erythropoiesis, we identified the transcripts that physically associate with Csde1. These mainly encoded proteins involved in ribogenesis, mRNA translation and protein degradation, but also proteins associated with the mitochondrial respiratory chain and mitosis. Crispr/Cas9-mediated deletion of the first cold shock domain of Csde1 affected RNA expression and/or protein expression of Csde1-bound transcripts. Protein expression of ribogenesis factors Rpf2, Nop56 and Ebna1bp2 was reduced in the deletion mutant, while mRNA was unchanged. Protein expression of Pabpc1 was enhanced while Pabpc1 mRNA expression was reduced. Strikingly, the effect of reduced Csde1 function on mRNA stability and translation of Csde1-bound transcripts was modest. The correlation efficient between protein (iBAQ) and mRNA (RPKM) expression was not different between Csde1-bound and other transcripts. We suggest that Csde1 is involved in feed-back control in protein homeostasis and that it dampens oscillations in gene expression.

2018-10-24 | PXD006358 | Pride

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