DamID in C. Elegans Reveals Longevity-associated Targets of DAF-16/FoxO

Overview

Journal Mol Syst Biol

Specialty Molecular Biology

Date 2010 Aug 14

PMID 20706209

Citations 80

Authors

Eugene Schuster

Joshua J McElwee

Jennifer M A Tullet

Ryan Doonan

Filip Matthijssens

John S Reece-Hoyes

Ian A Hope

Jacques R Vanfleteren

Janet M Thornton

David Gems

Affiliations

Soon will be listed here.

Abstract

Insulin/IGF-1 signaling controls metabolism, stress resistance and aging in Caenorhabditis elegans by regulating the activity of the DAF-16/FoxO transcription factor (TF). However, the function of DAF-16 and the topology of the transcriptional network that it crowns remain unclear. Using chromatin profiling by DNA adenine methyltransferase identification (DamID), we identified 907 genes that are bound by DAF-16. These were enriched for genes showing DAF-16-dependent upregulation in long-lived daf-2 insulin/IGF-1 receptor mutants (P=1.4e(-11)). Cross-referencing DAF-16 targets with these upregulated genes (daf-2 versus daf-16; daf-2) identified 65 genes that were DAF-16 regulatory targets. These 65 were enriched for signaling genes, including known determinants of longevity, but not for genes specifying somatic maintenance functions (e.g. detoxification, repair). This suggests that DAF-16 acts within a relatively small transcriptional subnetwork activating (but not suppressing) other regulators of stress resistance and aging, rather than directly regulating terminal effectors of longevity. For most genes bound by DAF-16::DAM, transcriptional regulation by DAF-16 was not detected, perhaps reflecting transcriptionally non-functional TF 'parking sites'. This study demonstrates the efficacy of DamID for chromatin profiling in C. elegans.

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