| 1995 |
The human LMNB1 gene spans more than 45 kb and is organized into 11 exons encoding an intermediate filament protein: exon 1 codes for the amino-terminal head domain and first portion of the central rod domain, exons 2–6 the central rod domain, and exons 7–11 the carboxyl-terminal tail domain. Intron positions are conserved with other vertebrate lamin genes but differ from Drosophila and C. elegans lamins. |
Genomic cloning and structural analysis of transcription unit |
Genomics |
High |
7557986
|
| 1995 |
The mouse Lmnb1 gene spans ~43 kb with 11 exons and 10 introns, with a promoter region containing a CpG island, CAAT box, and multiple SP1 sites but no classical TATA box, consistent with a housekeeping gene promoter. |
Genomic cloning and promoter analysis |
Genomics |
High |
8586436
|
| 1996 |
LMNB1 was mapped by fluorescence in situ hybridization to chromosomal band 5q23.3–q31.1 in humans. |
Fluorescence in situ hybridization (FISH) |
Genomics |
High |
8838815
|
| 1993 |
LAP 2, an integral membrane protein of the nuclear envelope, specifically associates with lamin B1 (but not lamins A/C), and this binding is inhibited by mitotic phosphorylation of LAP 2; LAP 2 also binds mitotic chromosomes and associates with chromosomes prior to lamin assembly during nuclear envelope reassembly. |
In vitro binding assays, phosphorylation by mitotic cytosol, immunofluorescence |
Cell |
High |
8324822
|
| 1996 |
Lamin B (along with lamin A/C) is cleaved by ICE-family cysteine proteases during apoptosis; expression of a cleavage-resistant mutant lamin B attenuated apoptosis and prevented chromatin condensation and nuclear shrinkage, demonstrating that lamin proteolysis facilitates nuclear events of apoptosis. |
Site-directed mutagenesis, in vitro and in vivo cleavage assays, morphological analysis |
The Journal of cell biology |
High |
8978814
|
| 2008 |
Lamin B1 (LB1) forms a separate but interacting stable meshwork from A-type lamins in the nuclear lamina. Silencing LB1 dramatically increases lamina meshwork size, increases nucleoplasmic lamin A mobility, causes lamin A/C-rich nuclear envelope blebs lacking LB2, and leads to association of gene-rich euchromatin with these blebs; transcription is decreased despite enrichment of active marks, suggesting promoter-proximal Pol II stalling. Thus LB1 is essential for lamin microdomain organization. |
RNAi knockdown, fluorescence correlation spectroscopy (FCS), CGH of microdissected blebs, FISH, immunofluorescence, in vivo RNA labeling |
Genes & development |
High |
19141474
|
| 2011 |
LB1 expression decreases during replicative senescence and oncogene-induced senescence in WI-38 cells. Silencing LB1 slows proliferation via p53-dependent reduction in mitochondrial ROS and induces premature senescence requiring both p53 and pRb. Conversely, LB1 overexpression increases proliferation and delays senescence. Eventually LB1 overexpression leads to G1/S arrest. |
siRNA knockdown, overexpression, flow cytometry, ROS measurements, hypoxia rescue experiments |
Genes & development |
High |
22155925
|
| 2012 |
Lamin B1 protein and mRNA are lost when primary human and murine cells undergo senescence induced by DNA damage, replicative exhaustion, or oncogene expression. Loss occurs at the mRNA level via decreased mRNA stability (not caspase-mediated degradation). Activation of either p53 or pRb tumor suppressor pathways is sufficient to induce LB1 loss. LB1 protein and mRNA also decline in mouse tissues after irradiation-induced senescence in vivo. |
Immunoblotting, qPCR, mRNA stability assays, genetic pathway analysis (p53/pRb), in vivo irradiation model |
Molecular biology of the cell |
High |
22496421
|
| 2013 |
Lamin B1 reduction in proliferating cells triggers senescence and large-scale chromatin reorganization, including formation of H3K4me3-enriched 'mesas' at lamin-associated domains (LADs) and H3K27me3-depleted 'canyons' between LADs. H3K4me3 mesas overlap DNA hypomethylation regions in cancer. Lamin B1 down-regulation is thus a key trigger of global chromatin changes that impact gene expression during senescence. |
ChIP-seq (H3K4me3, H3K27me3), genome-wide LAD mapping, lamin B1 knockdown, oncogene-induced senescence models |
Genes & development |
High |
23934658
|
| 2015 |
The autophagy protein LC3/Atg8 is present in the nucleus and directly interacts with lamin B1. This interaction does not degrade lamin B1 during starvation but mediates its degradation upon activated RAS oncogene insult by nucleus-to-cytoplasm transport delivering lamin B1 to the lysosome. Inhibiting autophagy or the LC3–lamin B1 interaction prevents activated RAS-induced lamin B1 loss and attenuates oncogene-induced senescence. |
Co-immunoprecipitation, proximity ligation, nuclear fractionation, lysosome inhibition, autophagy genetic knockouts, live imaging |
Nature |
High |
26524528
|
| 2012 |
BioID proximity-dependent biotinylation applied to lamin A identifies proteins that are near-neighbors or interactors of the nuclear lamina in vivo, including known lamin B1-proximal nuclear envelope proteins, establishing BioID as a method to map the lamin interactome including LMNB1-associated proteins. |
BioID (proximity-dependent biotin identification), affinity capture, mass spectrometry |
The Journal of cell biology |
Medium |
22412018
|
| 2013 |
LMNB1 duplications causing ADLD are non-recurrent intrachromosomal events, arise by NHEJ or replication-based mechanisms (FoSTeS/MMBIR), and result in increased LMNB1 mRNA and protein in patient fibroblasts. All three LMNB1 alleles in ADLD patients show equal expression, indicating regulatory regions are maintained within the rearranged segment. |
Molecular analysis of duplication junctions at nucleotide level, allele-specific expression by sequencing, RT-PCR, immunoblotting |
Human mutation |
High |
23649844
|
| 2013 |
A missense variant A436T in LMNB1, identified in neural tube defect patients, compromises the stability of lamin B1 interaction within the nuclear lamina as demonstrated by fluorescence loss in photobleaching (FLIP), suggesting that lamin B1 mobility/stability within the lamina is functionally important. |
Fluorescence loss in photobleaching (FLIP), mutant LMNB1 expression |
Birth defects research. Part A, Clinical and molecular teratology |
Medium |
23733478
|
| 2020 |
De novo missense mutations in LMNB1 cause primary microcephaly. Two variants in the head domain decrease nuclear localization of LMNB1 and increase misshapen nuclei; a variant in the coil region increases frequency of condensed nuclei and reduces steady-state lamin B1 levels in proband lymphoblasts. All mutations impair formation of the LMNB1 nuclear lamina. |
Functional analysis of missense mutations: immunofluorescence of nuclear lamina formation, nuclear morphology quantification, immunoblotting of patient lymphoblasts |
American journal of human genetics |
High |
32910914
|
| 2021 |
In human patient-specific cholinergic motor neurons (DYT1 dystonia with heterozygous TOR1A mutation), LMNB1 is upregulated and shows abnormal subcellular distribution. Ectopic expression of mutant TOR1A or shRNA knockdown of endogenous TOR1A in healthy MNs recapitulates LMNB1 dysregulation. Importantly, downregulation of LMNB1 largely ameliorates all DYT1 cellular defects including reduced neurite length, thickened nuclear lamina, disrupted nuclear morphology, and impaired nucleocytoplasmic transport. |
iPSC/fibroblast-derived human motor neurons, shRNA knockdown, ectopic TOR1A expression, immunofluorescence, nucleocytoplasmic transport assays |
The Journal of neuroscience |
High |
33468570
|
| 2022 |
LMNB1 knockdown in lung adenocarcinoma cells decreases H3K9me3, increases chromosome accessibility (ATAC-seq), increases p53, p21, p16, and γ-H2AX protein expression, and increases senescence-positive cells, demonstrating that LMNB1 regulates heterochromatin compaction and suppresses DNA damage/senescence pathways in cancer cells. |
siRNA knockdown, ATAC-seq, immunofluorescence, TRAP, TUNEL, western blotting, xenograft model |
Frontiers in oncology |
Medium |
35712471
|
| 2023 |
MDM2 (E3 ubiquitin ligase) increases p53 ubiquitination, which in turn activates LMNB1 expression. METTL3-mediated m6A methylation of MDM2 mRNA stabilizes it via YTHDF1, increasing MDM2→p53 ubiquitination→LMNB1 upregulation. Knockdown of LMNB1 reduces mitochondrial damage and ferroptosis markers in LPS-treated kidney tubular cells. |
Gene knockdown/overexpression, m6A methylation detection, YTHDF1 RIP assay, mitochondrial damage and ferroptosis assays |
European journal of medicinal chemistry |
Medium |
37542992
|
| 2024 |
WTAP promotes LMNB1 expression via m6A methylation modification of LMNB1 mRNA, as demonstrated by meRIP assay, RIP, dual-luciferase reporter and actinomycin D stability assay. WTAP knockdown reduces LMNB1, suppressing NF-κB and JAK2/STAT3 pathway activation and reducing inflammation, mitochondrial damage, and ferroptosis in LPS-treated kidney cells. |
meRIP assay, RIP assay, dual-luciferase reporter, actinomycin D mRNA stability assay, pathway inhibitor experiments |
Journal of bioenergetics and biomembranes |
Medium |
38517565
|
| 2024 |
LMNB1 directly binds the HBV enhancer II/basic core promoter (EnhII/BCP) DNA as shown by DNA pull-down assay. Acetylation of LMNB1 at residues K111 and K261 (increased by ENPP1) inhibits HBV promoter activity; LMNB1 acetylation mutants (111R, 261Q, 261R, 483Q, 483R) show increased promoter activity. Thus LMNB1 functions as a transcriptional repressor of HBV through acetylation-dependent DNA binding. |
DNA pull-down assay, luciferase reporter assay with promoter/mutant constructs, acetylation site mutagenesis, overexpression studies |
Archives of virology |
Medium |
38265511
|
| 2024 |
Classic ADLD is caused by intra-TAD duplications of LMNB1 resulting in simple gene dose gain. Atypical ADLD is caused by inter-TAD deletions or duplications that lead to LMNB1 forebrain-specific misexpression by disrupting topologically associating domain boundaries. A duplication crossing two TAD boundaries did not cause ADLD, demonstrating that altered 3D genome architecture (TAD disruption) rather than mere copy number increase is the pathogenic mechanism in atypical ADLD. |
Hi-C (high-throughput chromosome conformation capture), RNA sequencing, histopathological analysis of postmortem brain |
Annals of neurology |
High |
39078102
|
| 2025 |
Zfp335 transcription factor directly binds the promoter of Lmnb1 and regulates its transcription. Overexpression of Lmnb1 significantly rescues the impaired homeostatic proliferation of Zfp335-deficient naïve T cells, placing Lmnb1 downstream of Zfp335 in the T cell homeostasis pathway. |
ChIP assay (Zfp335 binding to Lmnb1 promoter), RNA-seq, qPCR, adoptive transfer model, Lmnb1 overexpression rescue |
Cell & bioscience |
Medium |
41088342
|
| 2025 |
Excess Lamin B1 (LB1) in neurons halts neuronal migration in the developing cortex without altering laminar identity or global gene expression. In vitro, excess LB1 elevates nuclear stiffness and impairs neuronal motility in confined spaces. Computational modeling and live imaging validate that nuclear deformation dynamics correlate with migration velocity. Cerebral organoids from LMNB1-duplication patient iPSCs show impaired neuronal migration. |
In vivo mouse cortical electroporation, live imaging, micropipette aspiration (nuclear stiffness), confined migration assay, electrophysiology, computational modeling, patient iPSC cerebral organoids |
bioRxivpreprint |
Medium |
bio_10.1101_2025.10.22.683830
|
| 2025 |
Conditional hypomorphic reduction of Lamin B1 in B cells causes elevated DNA damage, altered chromatin accessibility, and disrupted transcriptional profiles. sBLISS identifies non-random double-strand break hotspots near transcriptional start sites and regulatory elements controlling translation and mRNA fate, revealing that Lamin B1 protects fragile regulatory chromatin regions from DNA damage in germinal center B cells. |
In vivo and in vitro B cell models with conditional Lamin B1 knockdown, sBLISS (in situ labeling and sequencing of DSBs), ATAC-seq, RNA-seq |
bioRxivpreprint |
Medium |
bio_10.1101_2025.11.03.686246
|
| 2024 |
LMNB1 promotes HCC cell proliferation by regulating CDKN1A (p21) expression, as revealed by GSEA pathway enrichment, recovery (rescue) analysis, and ChIP assays showing LMNB1 occupancy at the CDKN1A locus. |
GSEA, ChIP assay, recovery analysis, in vitro and in vivo proliferation assays with LMNB1 knockdown |
Current cancer drug targets |
Low |
38778606
|
| 2017 |
LMNB1 knockdown in ovarian cancer cells suppresses proliferation and migration via inhibition of FGF1-mediated PI3K-Akt signaling, as revealed by RNA-seq and validated by pathway rescue experiments. |
Stable LMNB1 knockdown, RNA-seq, PI3K/Akt pathway analysis, xenograft model |
Experimental cell research |
Low |
37003558
|
| 2024 |
LMNB1 activates GPR84 transcription and thereby promotes JAK2/STAT3-dependent M2 macrophage polarization in lung cancer; dual luciferase and ChIP assays confirm LMNB1 as a transcriptional activator of the GPR84 promoter. |
Dual luciferase reporter assay, ChIP assay, JAK-STAT pathway inhibitor experiments, co-culture macrophage polarization assay |
Human immunology |
Medium |
39357468
|