dar13232 contains a premature stop codon so that only a fragment of the N-terminal half of the protein can be produced, without the nuclear localization signal and zinc finger domains.
dar13232/dar13232 larval dendritic arborizing neurons display loss of the multipolar layout of dendrites, with many becoming bipolar, and some Class I dendritic arborizing neurons becoming unipolar. Axon targeting and terminal branching is unaffected.
dar13232/dar13232 larval es neurons not do not show a significant change in morphology as compared to wild type.
dar13232 engenders a decrease in the percentage of multi-compartmental Golgi in dendrites of larval dendritic arborization neurons without affecting the Golgi in the soma and branch points.
In dar13232 mutants, major dendrites of class IV da neurons are either missing or shortened, consequently resulting in a reduced dendritic arbor. In contrast, the axonal growth of these neurons is normal. Dendrites of class I da neurons are also severely shortened.
dar13232/dar13010 mutants, generated by crossing dar13232 germline clones with dar13010 mutants show the same phenotype as dar13232 zygotic mutants, that is, the dendrites are reduced but the axons are normal. Dendritic defects are visible as early as 16-17 hours after egg laying and become more pronounced in 18-19 hours after egg laying, suggesting these mutants exhibit reduced outgrowth of dendrites.
Single neurons homozygous for dar13232, generated through MARCM, exhibit severely reduced dendritic arbors, supporting the notion that dar1 functions cell-autonomously. Dendrites are dramatically reduced in all four classes of da neurons (class I-ddaD and ddaE, class II-ddaB, class III-ddaA, and class IV-ddaC). In contrast, there is no significant defect in axonal growth in these mutants.
dar13232 has abnormal neuroanatomy | somatic clone phenotype, suppressible | partially by Scer\GAL4unspecified/nudEUAS.A
dar13232 has dendritic arborizing neuron | somatic clone phenotype, suppressible | partially by Scer\GAL4unspecified/nudEUAS.A
Expression of nudEScer\UAS.A under the control of Scer\GAL4unspecified partially rescues the increased number of bipolar dendritic arborizing neurons seen in dar13232/dar13232 mutant clones.