A microRNA feedback loop regulates global microRNA abundance during aging

Sachi Inukai, Zachary Pincus, Alexandre De Lencastre, Frank J. Slack

Research output: Contribution to journalArticlepeer-review

31 Scopus citations


Expression levels of many microRNAs (miRNAs) change during aging, notably declining globally in a number of organisms and tissues across taxa. However, little is known about the mechanisms or the biological relevance for this change. We investigated the network of genes that controls miRNA transcription and processing during C. elegans aging. We found that miRNA biogenesis genes are highly networked with transcription factors and aging-Associated miRNAs. In particular, miR-71, known to influence life span and itself up-regulated during aging, represses alg-1/Argonaute expression post-Transcriptionally during aging. Increased ALG-1 abundance in mir-71 loss-of-function mutants led to globally increased miRNA expression. Interestingly, these mutants demonstrated widespread mRNA expression dysregulation and diminished levels of variability both in gene expression and in overall life span. Thus, the progressive molecular decline often thought to be the result of accumulated damage over an organism's life may be partially explained by a miRNA-directed mechanism of age-Associated decline.

Original languageEnglish
Pages (from-to)159-172
Number of pages14
Issue number2
StatePublished - Feb 2018


  • Aging
  • Argonaute
  • Caenorhabditis elegans
  • MiR-71
  • MicroRNAs


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