Loss of vacuolar acidity results in iron-sulfur cluster defects and divergent homeostatic responses during aging in Saccharomyces cerevisiae

GeroScience - Tập 42 - Trang 749-764 - 2020
Kenneth L. Chen1, Toby N. Ven1, Matthew M. Crane1, Matthew L. C. Brunner1, Adrian K. Pun1, Kathleen L. Helget2, Katherine Brower1, Dexter E. Chen1, Ha Doan1, Justin D. Dillard-Telm1, Ellen Huynh1, Yen-Chi Feng1, Zili Yan1, Alexandra Golubeva1, Roy A. Hsu1, Raheem Knight1, Jessie Levin1, Vesal Mobasher1, Michael Muir1, Victor Omokehinde1, Corey Screws1, Esin Tunali1, Rachael K. Tran1, Luz Valdez1, Edward Yang1, Scott R. Kennedy1, Alan J. Herr1, Matt Kaeberlein1, Brian M. Wasko2
1Department of Pathology, University of Washington, Seattle, USA
2Department of Biology and Biotechnology, University of Houston-Clear Lake, Houston, USA

Tóm tắt

The loss of vacuolar/lysosomal acidity is an early event during aging that has been linked to mitochondrial dysfunction. However, it is unclear how loss of vacuolar acidity results in age-related dysfunction. Through unbiased genetic screens, we determined that increased iron uptake can suppress the mitochondrial respiratory deficiency phenotype of yeast vma mutants, which have lost vacuolar acidity due to genetic disruption of the vacuolar ATPase proton pump. Yeast vma mutants exhibited nuclear localization of Aft1, which turns on the iron regulon in response to iron-sulfur cluster (ISC) deficiency. This led us to find that loss of vacuolar acidity with age in wild-type yeast causes ISC defects and a DNA damage response. Using microfluidics to investigate aging at the single-cell level, we observe grossly divergent trajectories of iron homeostasis within an isogenic and environmentally homogeneous population. One subpopulation of cells fails to mount the expected compensatory iron regulon gene expression program, and suffers progressively severe ISC deficiency with little to no activation of the iron regulon. In contrast, other cells show robust iron regulon activity with limited ISC deficiency, which allows extended passage and survival through a period of genomic instability during aging. These divergent trajectories suggest that iron regulation and ISC homeostasis represent a possible target for aging interventions.

Tài liệu tham khảo

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