Amino acid replacement V163M in the Act88F coding region. The equivalent mutation in the human ACTA1 gene is associated with actinopathy and intranuclear rods.
G15441105A
G?A
V164M | Act88F-PA
V163M
Analogous mutation in human ACTA1 implicated in nemaline myopathy 3; mutation carried on in vitro construct.
Flies carrying one copy of Act88FV163M in a Act88F6/+ background are completely flightless.
Flies carrying one copy of Act88FV163M in a Act88F6/+ background show major defects in Z- disc organisation in the indirect flight muscles. Recognisable ordered myofibrils are not formed in the indirect flight muscles of flies carrying two copies of Act88FV163M in a homozygous Act88F6 background, although disordered actin filaments are present.
Closely packed Z-disc stacks or "zebra bodies" are seen in the indirect flight muscles of flies carrying one copy of Act88FV163M in a Act88F6/+ background. Areas in which Z-discs appear to be splitting apart are also seen.
Ring-like Z-disc structures or aggregates and F-actin containing intranuclear rods are seen in the indirect flight muscles of flies carrying one copy of Act88FV163M in a Act88F6/+ background.
Expression of Act88F+t4.0 in flies carrying one copy of Act88FV163M in a Act88F6/+ background rescues flight ability.