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Mijaljica D, et al.  (2012) A Late Form of Nucleophagy in Saccharomyces cerevisiae. PLoS One 7(6):e40013

Abstract: Autophagy encompasses several processes by which cytosol and organelles can be delivered to the vacuole/lysosome for breakdown and recycling. We sought to investigate autophagy of the nucleus (nucleophagy) in the yeast Saccharomyces cerevisiae by employing genetically encoded fluorescent reporters. The use of such a nuclear reporter, n-Rosella, proved the basis of robust assays based on either following its accumulation (by confocal microscopy), or degradation (by immunoblotting), within the vacuole. We observed the delivery of n-Rosella to the vacuole only after prolonged periods of nitrogen starvation. Dual labeling of cells with Nvj1p-EYFP, a nuclear membrane reporter of piecemeal micronucleophagy of the nucleus (PMN), and the nucleoplasm-targeted NAB35-DsRed.T3 allowed us to detect PMN soon after the commencement of nitrogen starvation whilst delivery to the vacuole of the nucleoplasm reporter was observed only after prolonged periods of nitrogen starvation. This later delivery of nuclear components to the vacuole has been designated LN (late nucleophagy). Only a very few cells showed simultaneous accumulation of both reporters (Nvj1p-EYFP and NAB35-DsRed.T3) in the vacuole. We determined, therefore, that delivery of the two respective nuclear reporters to the vacuole is temporally and spatially separated. Furthermore, our data suggest that LN is mechanistically distinct from PMN because it can occur in nvj1Delta and vac8Delta cells, and does not require ATG11. Nevertheless, a subset of the components of the core macroautophagic machinery is required for LN as it is efficiently inhibited in null mutants of several autophagy-related genes (ATG) specifying such components. Moreover, the inhibition of LN in some mutants is accompanied by alterations in nuclear morphology.

Status: Published Type: Journal Article PubMed ID: 22768199

Topics addressed in this paper

Number of different genes curated to this paper: 48

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Topics Genes linked to topics (#1 - 10 )
ATG1 ATG10 ATG11 ATG12 ATG13 ATG15 ATG16 ATG17 ATG18 ATG19
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Topics Genes linked to topics (#11 - 20 )
ATG2 ATG20 ATG21 ATG22 ATG23 ATG26 ATG27 ATG29 ATG3 ATG31
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Topics Genes linked to topics (#21 - 30 )
ATG32 ATG33 ATG34 ATG4 ATG5 ATG7 ATG8 ATG9 EAF1 HSV2
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Topics Genes linked to topics (#31 - 40 )
MEH1 NVJ1 PEP4 SLM4 SNX4 TAO3 TCO89 VAB2 VAC17 VAC8
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Topics Genes linked to topics (#41 - 48 )
VPS15 VPS30 VTC1 VTC2 VTC3 VTC4 YEL043W YFR035C
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