Ubiquitin specific protease 21 is dispensable for normal development, hematopoiesis and lymphocyte differentiation

PloS One
Jaspreet PannuAnastasia Nijnik

Abstract

USP21 is a ubiquitin specific protease that catalyzes protein deubiquitination, however the identification of its physiological substrates remains challenging. USP21 is known to deubiquitinate transcription factor GATA3 and death-domain kinase RIPK1 in vitro, however the in vivo settings where this regulation plays a biologically significant role remain unknown. In order to determine whether USP21 is an essential and non-redundant regulator of GATA3 or RIPK1 activity in vivo, we characterized Usp21-deficient mice, focusing on mouse viability and development, hematopoietic stem cell function, and lymphocyte differentiation. The Usp21-knockout mice were found to be viable and fertile, with no significant dysmorphology, in contrast to the GATA3 and RIPK1 knockout lines that exhibit embryonic or perinatal lethality. Loss of USP21 also had no effect on hematopoietic stem cell function, lymphocyte development, or the responses of antigen presenting cells to TLR and TNFR stimulation. GATA3 levels in hematopoietic stem cells or T lymphocytes remained unchanged. We observed that aged Usp21-knockout mice exhibited spontaneous T cell activation, however this was not linked to altered GATA3 levels in the affected cells. The contrast in the...Continue Reading

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Datasets Mentioned

BETA
GM-CSF

Methods Mentioned

BETA
ubiquitination
PCR
electrophoresis
ELISA
flow cytometry
FCS
FACS
ELISAs
Assay
gene-trap

Related Concepts

Usp16 protein, mouse
Metazoa
Cell Differentiation Process
Veiled Cells
Hematopoiesis, Medullary
Colony-Forming Units, Hematopoietic
Lymphocyte Activation
Lymphoid Cells
Macrophage
T-Lymphocyte

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