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Spectraplakin Shot Maintains Perinuclear Microtubule Organization in Drosophila Polyploid Cells.

Developmental cell | 2019

Polyploid cells endoreplicate their DNA through a modified cell cycle that skips mitosis as part of their differentiation programs. Upon cell-cycle exit and differentiation, non-centrosomal sites govern microtubule distribution in most cells. Little is known on how polyploid cells, differentiated but cycling, organize their microtubules. We show that microtubules in Drosophila adipocytes and other polyploid tissues form a dense perinuclear cortex responsible for nuclear size and position. Confirming a relation between this perinuclear cortex and the polyploid endocycle, polyploidization of normally diploid cells was sufficient for cortex formation. A critical component of the perinuclear microtubule organizer (pnMTOC) is Shot, absence of which caused collapse of the perinuclear network into a condensed organizer through kinesin-dependent microtubule sliding. Furthermore, this ectopic organizer was capable of directing partial assembly of a deeply disruptive cytokinesis furrow. In all, our study revealed the importance of perinuclear microtubule organization for stability of endocycling Drosophila cells.

Pubmed ID: 31006649 RIS Download

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Imaris (tool)

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RRID:AB_2567589

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RRID:FlyBase_FBst0491653

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Drosophila melanogaster with name PBac{fTRG00574.sfGFP-TVPTBF}VK00033 from Flybase.

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Drosophila melanogaster with name w[*] P{w[+mC]=PTT-un1}ZCL1700 from DGGR.

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P{KK111668}VIE-260B (organism)

RRID:FlyBase_FBst0478636

Drosophila melanogaster with name P{KK111668}VIE-260B from Flybase.

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w[1118]; P{GD956}v21594/TM3 (organism)

RRID:FlyBase_FBst0454128

Drosophila melanogaster with name w[1118]; P{GD956}v21594/TM3 from Flybase.

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