Linking the Circadian Rhythm Gene Arntl2 to Interleukin 21 Expression in Type 1 Diabetes

  1. Ute C. Rogner1
  1. 1Department of Developmental & Stem Cells Biology, Institut Pasteur, CNRS URA 2578, Laboratoire de Génétique Moléculaire Murine, Paris, France
  2. 2Université Pierre et Marie Curie, Cellule Pasteur UPMC, Paris, France
  1. Corresponding author: Ute C. Rogner, ute-christine.rogner{at}pasteur.fr.

Abstract

The circadian rhythm–related aryl hydrocarbon receptor nuclear translocator-like 2 (Arntl2) gene has been identified as a candidate gene for the murine type 1 diabetes locus Idd6.3. Previous studies suggested a role in expansion of CD4+CD25 T cells, and this then creates an imbalance in the ratio between T-effector and CD4+CD25+ T-regulator cells. Our transcriptome analyses identify the interleukin 21 (IL21) gene (Il21) as a direct target of ARNTL2. ARNTL2 binds in an allele-specific manner to the RNA polymerase binding site of the Il21 promoter and inhibits its expression in NOD.C3H congenic mice carrying C3H alleles at Idd6.3. IL21 is known to promote T-cell expansion, and in agreement with these findings, mice with C3H alleles at Idd6.3 produce lower numbers of CD4+IL21+ and CD4+ and CD8+ T cells compared with mice with NOD alleles at Idd6.3. Our results describe a novel and rather unexpected role for Arntl2 in the immune system that lies outside of its predicted function in circadian rhythm regulation.

Footnotes

  • Received November 6, 2013.
  • Accepted February 3, 2014.

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  1. Diabetes vol. 63 no. 6 2148-2157
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