NSrp70 is a lymphocyte-essential splicing factor that controls thymocyte development

Author:

Kim Chang-Hyun12ORCID,Park Sang-Moo12,Lee Sun-jae1,Kim Young-Dae12,Jang Se-Hwan1,Woo Seon-Min3,Kwon Taeg-Kyu3,Park Zee-Yong1,Chung Ik-Joo4,Kim Hye-Ran12,Jun Chang-Duk12ORCID

Affiliation:

1. School of Life Sciences, Gwangju Institute of Science and Technology (GIST), Gwangju 61005, Korea

2. Immune Synapse and Cell Therapy Research Center, Gwangju Institute of Science and Technology (GIST), Gwangju 61005, Korea

3. Department of Immunology, School of Medicine, Keimyung University, Daegu 42601, Korea

4. Department of Hematology-Oncology, Immunotherapy Innovation Center, Chonnam National University Medical School, Hwasun 58128, Korea

Abstract

Abstract Alternative pre-mRNA splicing is a critical step to generate multiple transcripts, thereby dramatically enlarging the proteomic diversity. Thus, a common feature of most alternative splicing factor knockout models is lethality. However, little is known about lineage-specific alternative splicing regulators in a physiological setting. Here, we report that NSrp70 is selectively expressed in developing thymocytes, highest at the double-positive (DP) stage. Global splicing and transcriptional profiling revealed that NSrp70 regulates the cell cycle and survival of thymocytes by controlling the alternative processing of various RNA splicing factors, including the oncogenic splicing factor SRSF1. A conditional-knockout of Nsrp1 (NSrp70-cKO) using CD4Cre developed severe defects in T cell maturation to single-positive thymocytes, due to insufficient T cell receptor (TCR) signaling and uncontrolled cell growth and death. Mice displayed severe peripheral lymphopenia and could not optimally control tumor growth. This study establishes a model to address the function of lymphoid-lineage-specific alternative splicing factor NSrp70 in a thymic T cell developmental pathway.

Funder

Creative Research Initiative Program

Bio-Synergy Research Project

outstanding young scientist program

Bio & Medical Technology Development Program

National Research Foundation

Ministry of Science and ICT, South Korea

Basic Science Program

NRF

Ministry of Education

National R&D Program for Cancer Control

GIST Research Institute

Institutes of Science and Technology

Publisher

Oxford University Press (OUP)

Subject

Genetics

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