H15nmr-614 homozygotes exhibit a dramatic increase in the rate of pacing-induced heart arrest/fibrillation, with further increases with age. However,H15nmr-614 heterozygotes do not display a significant increase in heart arrest/fibrillation following pacing compared to wild-type.
Only 5% of H15nmr-614 stage 16/17 embryos show defects in heart tube morphogenesis.
H15nmr-614 is an enhancer of embryonic/larval heart phenotype of Scer\GAL4how-24B, Scer\GAL4twi.PG, midRNAi.UAS
H15nmr-614 is an enhancer of cardioblast phenotype of Scer\GAL4how-24B, Scer\GAL4twi.PG, midRNAi.UAS
H15nmr-614/H15[+] is a non-enhancer of adult heart phenotype of pnrVX6
H15nmr-614/H15[+] is a non-enhancer of adult heart phenotype of pnr1
H15nmr-614/H15[+] is a non-enhancer of adult heart phenotype of pnrVX1e
H15nmr-614/H15[+] is a non-suppressor of adult heart phenotype of pnrVX1e
H15nmr-614/H15[+] is a non-suppressor of adult heart phenotype of pnr1
H15nmr-614/H15[+] is a non-suppressor of adult heart phenotype of pnrVX6
H15nmr-614, Scer\GAL4how-24B, Scer\GAL4twi.PG, midRNAi.UAS has cardioblast phenotype
The increase in heart arrest/fibrillation upon electrical pacing that is seen in pnrVX1e/+, pnr1/+ or pnrVX6/+ adults is not significantly altered by H15nmr-614/+.
The heart morphogenesis defect of embryos expressing middsRNA.Scer\UAS under the control of both Scer\GAL4how-24B and Scer\GAL4twi.PG is enhanced in a H15nmr-614 background, with a greater number of embryos exhibiting misalignment of the myocardial cells. Additionally, these double mutant embryos show a reduction in the number of myocardial cells and a concomitant increase in pericardial cells at stage 14, a phenotype not seen either in H15nmr-614 or Scer\GAL4how-24B,Scer\GAL4twi.PG > middsRNA.Scer\UAS single mutants.