PT  - JOURNAL ARTICLE
AU  - Michael Xiao
AU  - Chia-Hua Wu
AU  - Graham Meek
AU  - Brian Kelly
AU  - Lyndsay E.A. Young
AU  - Sara Martire
AU  - Dara Buendia Castillo
AU  - Purbita Saha
AU  - Altair L. Dube
AU  - Matthew S. Gentry
AU  - Laura A. Banaszynski
AU  - Ramon C. Sun
AU  - Chintan K. Kikani
TI  - A cell cycle-linked mechanism for the glutamine driven establishment of stem cell fate
AID  - 10.1101/2022.03.24.485713
DP  - 2022 Jan 01
TA  - bioRxiv
PG  - 2022.03.24.485713
4099  - http://biorxiv.org/content/early/2022/03/25/2022.03.24.485713.short
4100  - http://biorxiv.org/content/early/2022/03/25/2022.03.24.485713.full
AB  - The cell cycle offers a unique opportunity for stem cells to sample metabolic and signaling cues to establish cell fate. Molecular pathways that integrate and convey these signals to cell cycle machinery to license cell fate transitions and drive terminal differentiation remain unknown. Here, we describe a signaling role of mitochondrial glutamine metabolism in driving exit from cell cycle-linked self-renewal to generate differentiation competent progenitors. In proliferating stem cells, mitochondrial glutamine metabolism opposes the WDR5-linked self-renewal network via acetylation and nuclear translocation of its upstream regulator, PASK. Nuclear PASK disrupts the mitotic WDR5-anaphase-promoting complex (APC/C) interaction to drive exit from self-renewal. Consistent with these roles, loss of PASK or inhibition of glutamine metabolism preserves stemness in vitro and in vivo during muscle regeneration. Our results suggest a mechanism whereby the proliferative functions of glutamine metabolism are co- opted by stem cells to establish cell fate.Competing Interest StatementThe authors have declared no competing interest.