Nucleotide substitution: A243G.
The genomic tim promoter drives expression of a mutated tim cDNA, in which the ATG start codon at position 243-245 is mutated to GGG so that only the short tim isoform can be expressed from this transgene. This construct is modified from the timmTim4 construct; a SwaI-KpnI fragment containing the mutated cDNA has replaced the SwaI-KpnI fragment of timmTim4.
Nucleotide substitution: T244G.
timmTimS flies kept in constant light conditions show locomotor arrhythmicity, as do wild-type flies.