Component of the IFT complex A (IFT-A), a complex required for retrograde ciliary transport and entry into cilia of G protein-coupled receptors (GPCRs) (PubMed:28479320). Plays a role in chemotaxis and sensory perception (PubMed:7240452, PubMed:7705621). Required for entry into and exit from the dauer larval stage and this may be mediated by daf-12, daf-16 and daf-41 (PubMed:7240452, PubMed:23284299, PubMed:25830239). Controls the behavioral response, namely the avoidance response, and pathogen-responsive gene expression in the response to pathogenic bacteria such as E.coli and P. aeruginosa (PubMed:23284299). Component of the IFT complex A (IFT-A) composed of at least che-11, daf-10, dyf-2, ift-139, ift-43 and ifta-1. Shuttles at the same rate as intraflagellar transport (IFT) complex B proteins such as osm-1, osm-5 and osm-6 along the cilia of the amphid and phasmid sensory neurons. Sterile. Defective chemotaxis with 86% of mutants exhibiting reduced tracking to the chemoattractant ammonium chloride.