Related Experiment Video
Updated: Jun 12, 2026
06:23
Detection of Nuclear Blebbing and DNA Leakage in Mammalian Cells by Immunofluorescence
Published on: January 17, 2025
Inheriting nuclear organization: can nuclear lamins impart spatial memory during post-mitotic nuclear assembly?
Catherine Martin1, Songbi Chen, Dean A Jackson
1Faculty of Life Sciences, University of Manchester, MIB, 131 Princess Street, Manchester, M1 7DN, UK.
Summary
Lamin B1 is crucial for successful cell division. Its remnants may guide nuclear reassembly after mitosis, ensuring the inheritance of genome organization.
Area of Science:
- Cell Biology
- Molecular Biology
- Genetics
Background:
- Genome organization and nuclear architecture are linked to cell type and tissue structure in eukaryotes.
- The mechanisms by which nuclear components re-establish their positions after mitosis remain unclear.
- Nuclear lamins, major structural proteins, are hypothesized to play a role in re-establishing nuclear compartments post-mitosis.
Purpose of the Study:
- To investigate the role of lamin B1 in nuclear assembly and cell division.
- To determine if lamin B1 remnants persist through mitosis and aid in nuclear reassembly.
Main Methods:
- RNA interference was used to reduce lamin B1 expression in human cells.
- Mitotic and nuclear assembly processes were observed in fixed and live cells.
- Phenotypic analysis focused on nuclear compartmentalization, chromatin structure, chromosome segregation, and centromere organization.
Main Results:
- Reduced lamin B1 expression led to mitotic defects, including impaired nuclear compartmentalization, chromatin disorganization, chromosome segregation failure, and centromere dysfunction.
- Cells with normal lamin B1 showed persistent lamin B1 foci associated with nuclear compartments during mitosis.
- Normal lamin B1 expression is essential for successful cell division.
Conclusions:
- Lamin B1 plays a critical role in maintaining nuclear organization and ensuring accurate cell division.
- Evidence suggests that lamin B1-containing nucleoskeletal remnants persist through mitosis.
- These remnants may serve as landmarks for the reassembly of the nucleus, facilitating the inheritance of nuclear organization across cell cycles.
Related Concept Videos
01:35Disassembly of Intermediate Filaments
Intermediate filaments (IFs) do not undergo spontaneous disassembly. Enzymes, kinases, and phosphatases add and remove phosphates from specific sites to regulate their disassembly. The IF concentration in the cytoplasm also regulates the disassembly. If the concentration crosses a threshold, it activates the protein kinases in the vicinity, allowing the phosphorylation of IFs.
Keratin proteins, found at the cell periphery near cell junctions, undergo a cycle of assembly and disassembly. In Type...
Keratin proteins, found at the cell periphery near cell junctions, undergo a cycle of assembly and disassembly. In Type...
03:17Inheritance of Chromatin Structures
Epigenetics is the study of inherited changes in a cell's phenotype without changing the DNA sequences. It provides a form of memory for the differential gene expression pattern to maintain cell lineage, position-effect variegation, dosage compensation, and maintenance of chromatin structures such as telomeres and centromeres. For example, the structure and location of the centromere on chromosomes are epigenetically inherited. Its functionality is not dictated or ensured by the underlying DNA...
02:10Additional Subnuclear Structures
The eukaryotic nucleus is a double membrane-bound organelle that contains nearly all of the cell’s genetic material in the form of chromosomes. It is rightly called the “brain” of the cell as it shoulders the responsibility of responding to various physiological processes, stress, altered metabolic conditions, and other cellular signals.
The nucleus contains many membrane-less subnuclear organelles or nuclear bodies, such as nucleoli, Cajal bodies, speckles, paraspeckles, etc. These nuclear...
The nucleus contains many membrane-less subnuclear organelles or nuclear bodies, such as nucleoli, Cajal bodies, speckles, paraspeckles, etc. These nuclear...
01:29Non-nuclear Inheritance
Most DNA resides in the nucleus of a cell. However, some organelles in the cell cytoplasm—such as chloroplasts and mitochondria—also have their own DNA. These organelles replicate their DNA independently of the nuclear DNA of the cell in which they reside. Non-nuclear inheritance describes the inheritance of genes from structures other than the nucleus.
01:29Non-nuclear Inheritance
Most DNA resides in the nucleus of a cell. However, some organelles in the cell cytoplasm—such as chloroplasts and mitochondria—also have their own DNA. These organelles replicate their DNA independently of the nuclear DNA of the cell in which they reside. Non-nuclear inheritance describes the inheritance of genes from structures other than the nucleus.
01:34Nuclear Protein Sorting
Nuclear protein sorting is the selective trafficking of histones, polymerases, gene regulatory proteins into the nucleus and exporting RNAs and ribosomes to the cytosol. It is a tightly controlled process that regulates gene expression within a cell.
Proteins targeted to the nucleus carry nuclear localization signals or NLS recognized by import receptors in the cytosol. Similarly, proteins with nuclear export signals are recognized by export receptors. Import and export receptors are...
Proteins targeted to the nucleus carry nuclear localization signals or NLS recognized by import receptors in the cytosol. Similarly, proteins with nuclear export signals are recognized by export receptors. Import and export receptors are...