[Drosophila melanogaster imaginal discs mitotic anomalies induced by tumor-supressor dlg silencing construction]

Mitosis, cytokinesis and nuclear texture of wing imaginal discs cells silenced by UAS-RNAi-dlg construct induced by 1096-Ga 14 driver were studied. The silencing construct contains coding region of dlg gene and the complementary region. Further, this RNA hairpin (Dietzl et al., 2007) is processed by endogenous protein Dicer and the resulting RNA fragments silence mRNA dlg. Tumor suppressor gene dlg is encoding for 21 transcripts. The construct UAS-RNAi-dlg inactivates 14 transcripts--RE, RH, RQ, RS, RG, RD, RL, RB, RK, RR, RT, RN, RA, RP--and does not silenced the other 7 (RO, RF, RI, RU, RJ, RC, RM). This permits to study functions of proteins containg guanilate-kinase domain IPR008145 at C-end of the protein. The most important consequences of the silencing are abnormal mitotic exit and the formation of binuclear cells. Quantitative fluorescence measurements of anti-H3-p histone and DAPI signals showed phase-specific changes in nuclear texture. The inactivation of cellular cortex polarization is the most likely target of dlg inactivation in mitosis.