Rasgrp1 mutation increases naïve T-cell CD44 expression and drives mTOR-dependent accumulation of Helios+ T cells and autoantibodies

Author:

Daley Stephen R1,Coakley Kristen M2,Hu Daniel Y1,Randall Katrina L13,Jenne Craig N4,Limnander Andre2,Myers Darienne R2,Polakos Noelle K2,Enders Anselm1,Roots Carla1,Balakishnan Bhavani5,Miosge Lisa A1,Sjollema Geoff5,Bertram Edward M15,Field Matthew A1,Shao Yunli1,Andrews T Daniel1,Whittle Belinda5,Barnes S Whitney6,Walker John R6,Cyster Jason G7,Goodnow Christopher C15,Roose Jeroen P2

Affiliation:

1. Department of Immunology, John Curtin School of Medical Research, The Australian National University, Canberra, Australia

2. Department of Anatomy, University of California, San Francisco, San Francisco, United States

3. Department of Immunology, Canberra Hospital and ANU Medical School, The Australian National University, Canberra, Australia

4. Institute of Infection, Immunity and Inflammation, University of Calgary, Calgary, Canada

5. Australian Phenomics Facility, John Curtin School of Medical Research, The Australian National University, Canberra, Australia

6. Department of Genetics, Genomics Institute, Novartis Research Foundation, San Diego, United States

7. Department of Microbiology and Immunology, Howard Hughes Medical Institute, University of California, San Francisco, San Francisco, United States

Abstract

Missense variants are a major source of human genetic variation. Here we analyze a new mouse missense variant, Rasgrp1Anaef, with an ENU-mutated EF hand in the Rasgrp1 Ras guanine nucleotide exchange factor. Rasgrp1Anaef mice exhibit anti-nuclear autoantibodies and gradually accumulate a CD44hi Helios+ PD-1+ CD4+ T cell population that is dependent on B cells. Despite reduced Rasgrp1-Ras-ERK activation in vitro, thymocyte selection in Rasgrp1Anaef is mostly normal in vivo, although CD44 is overexpressed on naïve thymocytes and T cells in a T-cell-autonomous manner. We identify CD44 expression as a sensitive reporter of tonic mTOR-S6 kinase signaling through a novel mouse strain, chino, with a reduction-of-function mutation in Mtor. Elevated tonic mTOR-S6 signaling occurs in Rasgrp1Anaef naïve CD4+ T cells. CD44 expression, CD4+ T cell subset ratios and serum autoantibodies all returned to normal in Rasgrp1AnaefMtorchino double-mutant mice, demonstrating that increased mTOR activity is essential for the Rasgrp1Anaef T cell dysregulation.

Funder

Sandler Program in Basic Science

National Institutes of Health

Wellcome Trust

Department of Innovation, Industry, Science, Research and Tertiary Education

Clive and Vera Ramasciotti Foundation Grant

National Health and Medical Research Council

Sandler Foundation

Department of Industry, Innovation, Science, Research and Tertiary Education, Australian Government

Publisher

eLife Sciences Publications, Ltd

Subject

General Immunology and Microbiology,General Biochemistry, Genetics and Molecular Biology,General Medicine,General Neuroscience

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