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Distinct Adaptive Mechanisms Drive Recovery from Aneuploidy Caused by Loss of the Ulp2 SUMO Protease [WGS]

ABSTRACT: In response to acute loss of the Ulp2 SUMO-specific protease, yeast become disomic for chromosome I (ChrI) and ChrXII. Here we report that ChrI disomy, which creates an adaptive advantage in part by increasing the dosage of the Ccr4 deadenylase, was eliminated by extended passaging. Loss of aneuploidy is often accompanied by mutations in essential SUMO-ligating enzymes, which reduced polySUMO-conjugate accumulation. The mRNA levels for almost all ribosomal proteins increases transiently upon initial loss of Ulp2, but elevated Ccr4 levels limit excess ribosome formation. Notably, extended passaging leads to increased levels of many small nucleolar RNAs (snoRNAs) involved in ribosome biogenesis, and higher dosage of three linked ChrXII snoRNA genes suppressed ChrXII disomy in ulp2Δ cells. Our data reveal that aneuploidy allows rapid adaptation to Ulp2 loss, but long-term adaptation restores euploidy. Cellular evolution restores homeostasis through countervailing mutations in SUMO-modification pathways and regulatory shifts in ribosome biogenesis.

ORGANISM(S): Saccharomyces cerevisiae

PROVIDER: GSE121899 | GEO | 2018/11/13

REPOSITORIES: GEO

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Distinct Adaptive Mechanisms Drive Recovery from Aneuploidy Caused by Loss of the Ulp2 SUMO Protease [RNA-seq]

Project description:In response to acute loss of the Ulp2 SUMO-specific protease, yeast become disomic for chromosome I (ChrI) and ChrXII. Here we report that ChrI disomy, which creates an adaptive advantage in part by increasing the dosage of the Ccr4 deadenylase, was eliminated by extended passaging. Loss of aneuploidy is often accompanied by mutations in essential SUMO-ligating enzymes, which reduced polySUMO-conjugate accumulation. The mRNA levels for almost all ribosomal proteins increases transiently upon initial loss of Ulp2, but elevated Ccr4 levels limit excess ribosome formation. Notably, extended passaging leads to increased levels of many small nucleolar RNAs (snoRNAs) involved in ribosome biogenesis, and higher dosage of three linked ChrXII snoRNA genes suppressed ChrXII disomy in ulp2Δ cells. Our data reveal that aneuploidy allows rapid adaptation to Ulp2 loss, but long-term adaptation restores euploidy. Cellular evolution restores homeostasis through countervailing mutations in SUMO-modification pathways and regulatory shifts in ribosome biogenesis.

2018-11-13 | GSE121898 | GEO

Loss of the SUMO Protease Ulp2 Triggers a Specific Multi-Chromosome Aneuploidy

Project description:Post-translational protein modification by the small ubiquitin-related modifier (SUMO) protein regulates numerous cellular pathways, including transcription, cell division and genome maintenance. The SUMO protease Ulp2 modulates many of these SUMO-dependent processes in budding yeast. To investigate changes to the transcriptome of cells lacking Ulp2, whole-genome RNA sequencing (RNA-seq) was employed. Unexpectedly, ulp2Δ cells display a general two-fold increase in transcript levels across two particular chromosomes, Chromosome I (ChrI) and Chromosome XII (ChrXII). Quantification of relative DNA levels showed that ChrI and ChrXII are present at twice their normal copy number in ulp2Δ cells. This double disomy occurs in mutants in multiple genetic backgrounds and does not require passage through meiosis. An abnormal number of chromosomes in a cell, termed aneuploidy, is usually deleterious. However, development of specific aneuploidies allows rapid adaptation to cellular stresses in yeast and other species, and aneuploidy characterizes most tumors. Extra copies of ChrI and ChrXII appear quickly following loss of active Ulp2, suggesting aneuploidy is an adaptive mechanism in cells lacking the functional SUMO protease. The specific aneuploidy in ulp2Δ cells highlights a unique example of a homogeneous, multi-chromosome aneuploidy in response to mutation of a single gene.

2017-08-11 | GSE85501 | GEO

Saccharomyces cerevisiae

Project description:Loss of the SUMO Protease Ulp2 Triggers a Specific Multi-Chromosome Aneuploidy

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SUMO-chain-regulated proteasomal degradation timing exemplified in DNA replication initiation

Project description:Similar to ubiquitin, SUMO forms chains, but the identity of SUMO-chain-modified factors and the purpose of this modification remain largely unknown. Here, we identify budding yeast SUMO protease Ulp2, able to disassemble SUMO chains, as a DDK interactor enriched at replication origins that promotes DNA replication initiation. Replication-engaged DDK is SUMOylated on chromatin, becoming a degradation-prone substrate when Ulp2 no longer protects it against SUMO-chain assembly. Specifically, SUMO chains channel DDK for SUMO-targeted ubiquitin ligase Slx5/Slx8-mediated and Cdc48 segregase-assisted proteasomal degradation. Importantly, the SUMOylation-defective ddk-KR mutant rescues inefficient replication onset and MCM activation in cells lacking Ulp2, suggesting that SUMO chains time DDK degradation. Using two unbiased proteomic approaches, we further identify subunits of the MCM helicase and other factors as SUMO-chain-modified degradation-prone substrates of Ulp2 and Slx5/Slx8. We thus propose SUMO-chain-/Ulp2-protease-regulated proteasomal degradation as a mechanism that times the availability of functionally-engaged SUMO-modified protein pools during replication and beyond.

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SMC Complexes Are Guarded by the SUMO Protease Ulp2 Against SUMO-Chain-Mediated Turnover

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2021-08-05 | PXD022717 | Pride

Distinct Adaptive Mechanisms Drive Recovery from Aneuploidy Caused by Loss of the Ulp2 SUMO Protease

Project description:Distinct Adaptive Mechanisms Drive Recovery from Aneuploidy Caused by Loss of the Ulp2 SUMO Protease

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Distinct Adaptive Mechanisms Drive Recovery from Aneuploidy Caused by Loss of the Ulp2 SUMO Protease [WGS]

Project description:Distinct Adaptive Mechanisms Drive Recovery from Aneuploidy Caused by Loss of the Ulp2 SUMO Protease [WGS]

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Distinct Adaptive Mechanisms Drive Recovery from Aneuploidy Caused by Loss of the Ulp2 SUMO Protease [RNA-seq]

Project description:Distinct Adaptive Mechanisms Drive Recovery from Aneuploidy Caused by Loss of the Ulp2 SUMO Protease [RNA-seq]

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Array46 750k test is an in-depht analysis to detect chromosomal alterations, CNVs and SNPs

Project description:The array46 750k study was performed in the DNA sample for mosaicism aneuploidy detection and loss or absence of heterozygosity. Samples include patients with phenotype associated with pigmentary mosaicism The array46 750k study was performed in the DNA sample to discard uniparental disomy (UPD)

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The Ccr4-Not complex regulates TORC1 signaling and mitochondrial metabolism by promoting vacuole V-ATPase activity

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