Deletion of approximately 2kb extending mainly in the 3' direction removing the site of insertion in locorC56, deleting exon I-1 and the following intron. A small inversion is also associated with this mutation.
When locoΔ13 or locoΔ293 are trans with locoM1 at 25oC escapers are produced. Escapers show a paralytic phenotype, and drop into the food and die of not rescued. Rescued adults show a severe impairment of spontaneous locomotor activity and show a shaking phenotype. Response to mechanical stimulation is weak (for locoΔ293) and non-existent (for locoΔ13). All adult escapers die after a maximum of 2 days.