Forkhead box protein O (DAF-16) (DAF-16)

Forkhead box protein O (DAF-16), most commonly referred to as DAF-16, is the single homolog of the Forkhead box O (FOXO) family of transcription factors in *Caenorhabditis elegans*[5][4][3][8]. DAF-16 functions as a central regulator of the insulin/insulin-like growth factor signaling (IIS) pathway and integrates multiple upstream signals to control the expression of genes involved in longevity, stress resistance, metabolism, immunity, development, and apoptosis[5][4][1][3][9]. It activates genes that mediate adaptation to adverse environmental conditions, notably promoting longevity, dauer formation (a stress-resistant larval stage), and metabolic flexibility[5][4][3][6]. DAF-16 activity is modulated primarily by IIS but can also be regulated independently by kinases such as JNK-1 and CST-1 in response to specific stresses[10]. Locally, DAF-16 is activated by nuclear translocation upon IIS reduction, leading to broad changes in gene expression[2][9]. DAF-16 homologs in higher organisms (FOXO1, FOXO3, FOXO4, FOXO6) are closely related and function similarly in aging and metabolic regulation[1]. The DAF-16 target pathway has been a cornerstone of research into molecular mechanisms of aging and stress resistance in multicellular organisms[5][4][3]. Currently, there are no direct drugs targeting DAF-16 as a therapeutic target, and it is predominantly studied as a genetic model for understanding conserved biology.

Other names

FOXO homologForkhead box OFOXO (in C. elegans)daf-16 (gene)DAF-16/FoxOForkhead transcription factor class O