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Loss of functional mutation in RPL27 and RPS27 identified by whole-exome sequencing in Diamond-Blackfan Anemia

ABSTRACT: We performed whole-exome sequencing analysis of 48 patients with no documented mutations/deletions involving known Diamond-Blackfan anemia genes and identified 10 mutations in previous known causative genes and 2 mutations in novel ribosomal genes.

PROVIDER: EGAS00001000875 | EGA |

REPOSITORIES: EGA

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RPS19 binding with and without Diamond-Blackfan anemia variants

Project description:We found that endogenously expressed RPS19 binds evolutionarily constrained intronic elements. By assessing overexpression of WT RPS19 and RPS19 harboring the most common Diamond-Blackfan anemia missense mutations, we confirmed that disease-relevant mutations alter RPS19 binding preferences in human cells.

2023-02-14 | GSE224998 | GEO

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.

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

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

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Project description:Gene expression analysis from erythroid progenitors (CD34+/CD71(high)/CD45- mononuclear cells from the bone marrow) of patients with Diamond-Blackfan anemia (due to RPS19 mutations) and control individuals.

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Gene expression analysis from erythroid progenitors of patients with Diamond-Blackfan anemia

2014-02-28 | E-GEOD-41817 | biostudies-arrayexpress

Defective ribosomal protein gene expression alters transcription, translation, apoptosis, and oncogenic pathways in Diamond-Blackfan anemia.

Project description:Transcriptome profile of highly purified multipotential (P), erythroid (E), and myeloid (M) bone marrow progenitors from three RPS19 mutated Diamond-Blackfan anemia and six control human subjects. Two group comparison of sex and age matched subjects. Bone marrow progenitors, gene expression profiling, Diamond-Blackfan anemia, RPS19

2012-10-16 | E-GEOD-41599 | biostudies-arrayexpress

Ribosomal Protein Gene Deletions in Diamond Blackfan Anemia

Project description:Diamond Blackfan anemia is a congenital bone marrow failure syndrome characterized by hypoproliferative anemia, often with associated physical abnormalities. Perturbations of the ribosome appear critically important to the development of DBA, as alterations in 9 different ribosomal protein genes have been identified in multiple unrelated families, along with rarer abnormalities of additional ribosomal proteins. However, presently only 50-60% of patients have an identifiable genetic lesion by ribosomal protein gene sequencing. Using genome-wide SNP array to evaluate for regions of recurrent copy variation, we identified deletions at known DBA-related ribosomal protein gene loci in 17% (9/51) of patients without an identifiable mutation, including RPS19, RPS17, RPS26, and RPL35A

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The Genetic Landscape of Diamond-Blackfan Anemia

Project description:The Genetic Landscape of Diamond-Blackfan Anemia

| PRJNA490765 | ENA

Defective ribosomal protein gene expression alters transcription, translation, apoptosis, and oncogenic pathways in Diamond-Blackfan anemia.

2012-10-16 | GSE41599 | GEO

In vitro expansion of normal and Diamond Blackfan anemia-derived peripheral blood erythroid progenitors

Project description:The Affymetrix Human Gene 2.0 ST array was used to measure differential expression of RNA isolated from normal and Diamond Blackfan anemia (DBA) erythroid progenitors after ex vivo expansion of circulating, peripheral blood derived hematopoietic stem cells under erythroid growth conditions. The gene-level probe summaries reported in this series were computed using RMA as implemented in the Bioconductor package Oligo v1.36.1. Diamond Blackfan anemia (DBA) is a congenital bone marrow failure syndrome characterized by erythroid aplasia, usually without perturbation of other hematopoietic lineages. Approximately 65% of DBA patients with autosomal dominant inheritance have heterozygous mutations or deletions in ribosomal protein (RP) genes while <1% of patients with X-linked inheritance have been identified with mutations in the transcription factor, GATA1. Erythroid cells from patients with DBA have not been well characterized and the mechanisms underlying the erythroid specific effects of either RP or GATA1 associated DBA remain unclear. We have developed an in vitro culture system to expand peripheral blood CD34+ progenitor cells from patients with DBA and differentiate them into erythroid cells. Cells from patients with RP or GATA1 mutations showed decreased proliferation and delayed erythroid differentiation compared to controls. RNA transcript analyses of erythroid cells from controls and patients with RP or GATA1 mutations showed distinctive differences, with upregulation of heme biosynthesis genes prominently in RP-mediated DBA and failure to upregulate components of the translational apparatus in GATA1-mediated DBA. Our data show that dysregulation of translational function is a common feature of DBA caused by both RP and GATA1 mutations.

2017-04-04 | GSE89540 | GEO

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