daf-1

Drugs that block lipid peroxidation or scavenge intracellular iron extend healthspan and lifespan in C. elegans independently of other mechanisms such as the daf-1/daf-16 (insulin/insulin-like growth factor 1 [IGF-1]) pathway, but unlike many aging mechanisms do not alter temporal scaling across the life cycle of C. elegans, but rather act at specific late points in the organism's life history, temporarily blocking execution of critical dysfunction that results in listless worms.

Many of the roles of the canonical DAF-7 pathway, involving both DAF-1 and DAF-3, have been identified using targeted genetic studies.

Hence, the daf-1 product appears to be a cell-surface receptor required for transduction of environmental signals into an appropriate developmental response.

They also raise the possibility of an unexpected function for DAF-1 and DAF-8 that is independent of their normal upstream activator, DAF-7.

In addition, the results showed that epoxiconazole activated the transforming growth factor-β (TGFβ) signaling pathway and increased the expression levels of gene daf-1, daf-3, daf-4, daf-5 and daf-7 in nematodes.

Notably, rescue of the DAF-1 TGF-β receptor in RIM/RIC interneurons is sufficient to significantly recover UPRER activation upon 1-undecene exposure.

Of these, the group 2 pathway, which includes the genes daf-1, daf-3, daf-4, daf-5, daf-7, daf-8, and daf-14, mediates the transduction of environmental signals through the ASI chemosensory neuron and encodes a TGF-beta-related signaling pathway.

Our data suggest that DAF-3 functions in the nervous system, and possibly the germline, to affect sperm guidance.

Group 1 genes (daf-11 and daf-21) are (1) strongly synergistic with group 2 genes for their Daf-c phenotype, (2) incompletely suppressed by dauer-formation defective (Daf-d) mutations in the genes daf-3 and daf-5 and (3) strongly suppressed by Daf-d mutations in nine genes that affect the structure of chemosensory endings.

Group 2 genes (daf-1, daf-4, daf-7, daf-8 and daf-14) are (1) strongly synergistic with group 1 genes for their Daf-c phenotype, (2) fully suppressed by Daf-d mutations in daf-3 and daf-5 and (3) not suppressed by Daf-d mutations in the nine genes that affect chemosensory ending structure.

We further show that BCAAs reduce a LET-363/mTOR-dependent neuro-endocrine signal, which we identify as DAF-7/TGFβ, and that impacts lifespan depending on its related receptors, DAF-1 and DAF-4, as well as ultimately on DAF-16/FoxO and HSF-1 in a cell-non-autonomous manner.

One of them, BRA-1, has been found to bind DAF-1, the type I receptor in the DAF-7 transforming growth factor-beta pathway through the conserved C-terminal region.

Also included in this group are three daf-1 alleles that do not exhibit the maternal rescue characteristic of other daf-1 alleles.

Many of the roles of the canonical DAF-7 pathway, involving both DAF-1 and DAF-3, have been identified using targeted genetic studies.

Genetic tests of the mechanism of activation of these receptors show that DAF-1 can signal in the absence of DAF-4 kinase activity.

Of these, the group 2 pathway, which includes the genes daf-1, daf-3, daf-4, daf-5, daf-7, daf-8, and daf-14, mediates the transduction of environmental signals through the ASI chemosensory neuron and encodes a TGF-beta-related signaling pathway.

Hierarchical clustering showed that the daf-1; daf-3 double mutants are transcriptionally more similar to wild type than daf-1 mutants.

In this study, we performed RNA sequencing on wild type, daf-1, and daf-1; daf-3 adult hermaphrodites.

Of these, the group 2 pathway, which includes the genes daf-1, daf-3, daf-4, daf-5, daf-7, daf-8, and daf-14, mediates the transduction of environmental signals through the ASI chemosensory neuron and encodes a TGF-beta-related signaling pathway.

Heterologous genetic complementation using a plasmid construct containing Hc-tgfbr1 genomic DNA failed to rescue the function of Ce-daf-1 (a known TGF-β type I receptor gene) in a daf-1-deficient mutant strain of C. elegans.