Insertion in exon 3 (coding region) resulting in the truncation of the NAT1 protein just after amino acid 850 and deletion of almost the entire W2 domain.
viable (with NAT1BG02338)
NAT1GS2099 embryos begin germband extension at approximately the correct time, but extension stops abruptly and the germband retracts. Mutants also exhibit an abnormally deep cephalic furrow. Mutants are able to form an embryonic cuticle, though they show a reduction in ventral cuticle bands.
NAT1GS2099 is rescued by NAT1+t12.6
NAT1+t12.6 completely rescues the lethality associated with NAT1GS2099.