Dysregulated microRNA Activity in Shwachman-Diamond Syndrome
Abstract
Shwachman-Diamond Syndrome (SDS) is an underdiagnosed and clinically-heterogeneous disorder resulting in bone marrow (BM) failure. SDS is caused by biallelic mutations in the SBDS gene, which normally functions in ribosomal subunit joining and mitotic spindle stabilization. Despite these insights, the molecular pathways leading to BM failure are unknown because the hematopoietic stem and progenitor cells (HSPC) affected by SBDS mutations are rare and heterogeneous. To investigate the mechanisms of SDS pathogenesis, we performed single cell RNA-sequencing on primary CD34+ HSPC from normal and SDS BM. We generated a single cell map of early lineage commitment, and found that SDS hematopoiesis was left-shifted with selective loss of granulocyte-monocyte progenitors (GMPs). Differential gene expression analysis revealed dysregulation of TGFbeta target genes in SDS hematopoietic stem cells (HSCs) and multipotent progenitors (MPPs), but not in lineage committed progenitors. Proteomic analysis of primary SDS patient plasma identified increased TGFbeta-family ligand production. Treatment of SDS patient BM with TGFbeta inhibitors increased hematopoietic colony formation, supporting a causative role for TGFbeta-signaling in SDS pathogenesis. These data establish TGFbeta as a therapeutic target in SDS and translate insights from single cell biology into a novel potential therapy.
Document Details
- Document Type
- Technical Report
- Publication Date
- Nov 01, 2018
- Accession Number
- AD1094189
Entities
People
- Carl Novina
Organizations
- Dana–Farber Cancer Institute