eLife assessment
This important study utilizes the nematode C. elegans and mammalian cell culture to investigate the role of MML-1/Mondo in conserved regulation of metabolism and aging. The evidence supporting the conclusions is compelling in some areas, such as localization, upstream pathways, and conservation. It is still incomplete in other areas, such as longevity pathway analysis and the link between Mondo and the key downstream mitochondrial metabolic pathways identified. The paper will be of interest to a broad range of biologists studying aging, metabolism, and transcriptional regulation.