Aberration breakpoint in Ank2.
Neuromuscular junctions of Ank2RM5-1/Ank2f02001 larvae have fewer but larger boutons than normal. The synaptic span (the widest extension of synaptic branches along a muscle fibre) is reduced compared to wild type.
Ank2K327/Ank2RM5-1 larvae show defects in expansion of synaptic branches at the NMJ during larval development, with no outgrowth or even retraction occurring in 66% of mutant NMJs between muscles 6/7 from early second to third instar, compared to no expansion being seen in only 12% of control NMJs during this period.