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The DREAM (DP, RB, E2F and MuvB) complex is required in humans to arrest the expression of cell cycle genes during quiescence. One of its members LIN52 has been isolated from the repressor complex but little is known about its molecular function. It has been reported recently that the serine residue 28 of LIN52 is phosphorylated by DYRK1A, and point mutation of this residue or down regulation of DYRK1A (which phosphorylates LIN52) leads to disruption of DREAM complex assembly, which is needed for G(0) arrest. Function of all the members of the dMyb complex (homologue of DREAM complex) in Drosophila melanogaster is not well characterized. We have studied the Drosophila orthologue of LIN52, known as dlin52, which is strongly conserved across various taxa from worms to human. dlin52 is reported to be present in a large protein complex containing important transcriptional regulators of cell proliferation and cell death like dE2F1, dMyb and dRbf. We have examined the expression of dlin52 transcripts and protein during development. Strong nuclear expression of dlin52 is seen in larval eye-antennal discs, brain, fat body, wing discs and salivary glands. dlin52 is abundantly expressed in endoreplicated tissues like salivary glands, fat body, and certain regions of the gut, and the nurse cells from adult ovaries. dlin52 is also expressed in the larval optic lobe, as well as in the developing neurons of ventral ganglion, indicating that this gene has an important role to play in cell cycle regulation and neuronal development. Robust expression of dlin52 protein was observed in quiescent cells like that of the imaginal cells of larval salivary gland, while marginal expression was seen in the germarium of adult ovary. Study of the spatial and temporal pattern of expression of this gene will help in better understanding of the function of this protein during various developmental processes.
Pubmed ID: 22178095 RIS Download
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View all literature mentionsThis polyclonal targets lin-52
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