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A systematic genomic screen implicates nucleocytoplasmic transport and membrane growth in nuclear size control


Membrane-bound organelles are maintained at a size proportional to cell size during cell growth and division. How this is achieved is a little-understood area of cell biology. The nucleus is generally present in single copy within a cell and provides a useful model to study overall membrane-bound organelle growth and organelle size homeostasis. Previous mechanistic studies of nuclear size control have been limited to cell-free nuclear assembly systems. Here, we screened a near genome-wide fission yeast gene deletion collection for mutants exhibiting aberrant nuclear size, to identify, more systematically, components involved in nuclear size control. Roles for protein complexes previously implicated in nuclear mRNA export and membrane synthesis were identified. Molecular and genetic analysis of mRNA nuclear export gene mutant cells with enlarged nuclear size revealed that general accumulation of nuclear content, including bulk mRNA and proteins, accompanies the nuclear size increase which is dependent on new membrane synthesis. We propose that properly regulated nucleocytoplasmic transport and nuclear envelope expansion are critical for appropriate nuclear size control in growing cells.


Vyšlo v časopise: A systematic genomic screen implicates nucleocytoplasmic transport and membrane growth in nuclear size control. PLoS Genet 13(5): e32767. doi:10.1371/journal.pgen.1006767
Kategorie: Research Article
prolekare.web.journal.doi_sk: https://doi.org/10.1371/journal.pgen.1006767

Souhrn

Membrane-bound organelles are maintained at a size proportional to cell size during cell growth and division. How this is achieved is a little-understood area of cell biology. The nucleus is generally present in single copy within a cell and provides a useful model to study overall membrane-bound organelle growth and organelle size homeostasis. Previous mechanistic studies of nuclear size control have been limited to cell-free nuclear assembly systems. Here, we screened a near genome-wide fission yeast gene deletion collection for mutants exhibiting aberrant nuclear size, to identify, more systematically, components involved in nuclear size control. Roles for protein complexes previously implicated in nuclear mRNA export and membrane synthesis were identified. Molecular and genetic analysis of mRNA nuclear export gene mutant cells with enlarged nuclear size revealed that general accumulation of nuclear content, including bulk mRNA and proteins, accompanies the nuclear size increase which is dependent on new membrane synthesis. We propose that properly regulated nucleocytoplasmic transport and nuclear envelope expansion are critical for appropriate nuclear size control in growing cells.


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