Amino acid replacement: W256term.
G22287221A
W256term | Hem-PA
W256term
G to A nucleotide change at the second or third position of the Trp codon leads to a nonsense mutation. (exact site of mutation unspecified). Site of nucleic acid difference in mutant inferred by FlyBase based on reported amino acid change.
cytoskeleton & embryonic epidermis | dorsal
Approximately 8% of HemC3-20 mutant embryos display a duplication of the RP2 neuron in one hemisegment and have one missing in the contralateral segment.
HemJ4-48/HemC3-20 mutant embryos have a duplication of the RP2 neuron in one hemisegment and have one missing in the contralateral segment.
Approximately 9% of HemC3-20/Df(3L)ED230 mutant embryos display a duplication of the RP2 neuron in one hemisegment and have one missing in the contralateral segment.
In HemC3-20 homozygous embryos the segmental commissures of the ventral nerve cord are not separated into distinct axon bundles and instead appear fused.
Mutant embryos show fused commissures and disrupted longitudinal connectives. The midline glial cells migrate in an abnormal path; they migrate laterally away from the midline along the forming commissural bundles (in wild-type embryos the midline glial cells show a posterior-ward migration). In stage 16 embryos, the midline glial cells fail to intercalate between the segmental commissure and a fused commissure phenotype develops. In the dorsal epidermis, pronounced F-actin bundles are seen in homozygous embryos, which often have a wavy appearance. These pronounced bundles are not seen in wild-type embryos. HemΔ2-6/HemC3-20 animals almost never eclose. The axonal phenotype is more pronounced in HemΔ2-6/HemC3-20 larvae than in homozygous HemΔ2-6 larvae.
Hem[+]/HemC3-20 is a non-suppressor of abnormal neuroanatomy | larval stage phenotype of Abl4/Abl1
HemC3-20 has larval ventral nerve cord commissure phenotype, suppressible by SCAR[+]/SCARunspecified
HemC3-20 has larval ventral nerve cord commissure phenotype, non-suppressible by WASp3/WASp3
Hem[+]/HemC3-20 is a non-suppressor of NMJ bouton | increased number phenotype of Abl4/Abl1
The fusion of commissures in the ventral nerve cords of HemC3-20 embryos is significantly repressed by SCARunspecified/+, but is unaffected by homozygosity for WASp3.
Allelic series based on mutant phenotype; HemC3-20 = HemJ4-48 > HemP168 > HemG1-37 > HemJ1-70.