Regulates pre-synaptic vesicle recycling at neuromuscular junctions of mechanosensory neurons. Plays a role in maintaining a normal defecation cycle. RNAi-mediated knockdown causes a reduction in progeny numbers and a lengthening of the defecation cycle. Touch responses are normal. Expression of poly-Q 128Q (128Q consists of the first 57 amino acids of human HTT with a 28 Gln residue expansion) in RNAi-mediated knockdown animals causes a more severe reduction in touch response compared to wild type expressing 128Q. Belongs to the SLA2 family.