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Cellular origin and clonal evolution of human dedifferentiated liposarcoma

ABSTRACT: This SuperSeries is composed of the SubSeries listed below.

ORGANISM(S): Homo sapiens

PROVIDER: GSE221494 | GEO | 2024/07/22

REPOSITORIES: GEO

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Cellular origin and clonal evolution of human dedifferentiated liposarcoma

Project description:Dedifferentiated liposarcoma (DDLPS) is the most frequent high-grade soft tissue sarcoma subtype. It is characterized by a component of undifferentiated tumor cells coexisting with a component of well-differentiated adipocytic tumor cells. Both dedifferentiated (DD) and well-differentiated (WD) components exhibit MDM2 amplification, however their cellular origin remains elusive. Using single-cell RNA sequencing and functional assays in paired WD and DD components from primary DDLPS tumors, we characterized the cellular heterogeneity of DDLPS tumor and micro-environment. We identified a population of tumor adipocyte stem cells (ASC) showing striking similarities with adipocyte stromal progenitors found in white adipose tissue. We show that tumor ASC harbor the ancestral genomic alterations of WD and DD components, suggesting that both derive from these progenitors following clonal evolution. Last, we show that DD tumor cells keep important biological properties of ASC including pluripotency and that their adipogenic properties are inhibited by a TGF-β high immunosuppressive tumor micro-environment.

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