Contains an 8bp deletion in exon 6, resulting in a frameshift and premature stop codon producing a 542 amino acid truncated protein with 12 novel amino acids.
Flies are uncoordinated showing frequent leg crossing and wings held up or out. Walking and righting ability is impaired. Spontaneous or induced (by light or mechanical stimuli) activity is vigorous. Mechanoreceptor potentials are invariably absent in thoracic macrochaete bristles. The sound evoked response (measured via the antennal nerve) is eliminated. ERGs are normal.