Category Ranking
98%
Total Visits
921
Avg Visit Duration
2 minutes
Citations
20
Article Abstract
Mitotic chromosome formation depends on coordinated SMC complex activities, yet how condensin engages cohesin during this process remains unclear. Samejima et al. combined synchronized mitotic entry, auxin-inducible degrons, high-resolution Hi-C, live-cell imaging, quantitative proteomics, and polymer simulations to dissect condensin I, condensin II, and cohesin interplay in vertebrate cells. They showed that condensins actively displace extrusive cohesin to dismantle interphase chromatin and build nested mitotic loops. Condensin II generates large, helical loops, and condensin I forms finer loops, together yielding the canonical rodlike mitotic chromosome. Cohesin, while preserving sister-chromatid cohesion, relocates to loop tips without blocking condensin. The study also reports the first in vivo measurements of condensin loop-extrusion speed. This work establishes a mechanistic, quantitative framework for mitotic chromosome architecture and offers predictive models for future genome-organization- and SMC-related pathology studies.
Download full-text PDF |
Source |
|---|---|
| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC12364523 | PMC |
| http://dx.doi.org/10.34133/research.0812 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Mitosis in spp., the causative agent of malaria, is fundamentally different from model eukaryotes, proceeding via a bipartite microtubule organising centre (MTOC) and lacking canonical regulators such as Polo and Bub1 kinases. During schizogony, asynchronous nuclear replication produces a multinucleate schizont, while rapid male gametogony generates an octaploid nucleus before gamete formation.
View Article and Find Full Text PDFIn most solid tumors, hypoxia constitutes a defining microenvironmental feature that reprograms malignant cells into a highly metastatic state by driving cellular plasticity and exacerbating chromosomal instability (CIN). However, the mechanisms by which cancer cells concurrently co-opt these elements of hypoxic adaptation to promote metastasis remains poorly understood. Here, we report that hypoxia promotes metastasis by suppressing the JmjC-containing histone lysine demethylase Kdm8.
View Article and Find Full Text PDFMammalian female meiosis is uniquely regulated to produce a developmentally competent egg capable of supporting embryogenesis. During meiosis I, homologous chromosomes segregate, with half extruded into the first polar body. The egg then arrests at metaphase II and only resumes meiosis and extrudes the second polar body following fertilization.
View Article and Find Full Text PDFThe parasitic protozoan assembles a bipolar mitotic spindle and undergoes a closed mitosis to segregate its megabase chromosomes and mini-chromosomes through mechanisms that are distinct from its mammalian host. This parasite employs a subset of trypanosome-specific nucleus- and spindle-associated proteins (NuSAPs) to regulate mitosis, but the mechanistic roles of these proteins remain poorly understood. Here, we performed biochemical and molecular characterization of NuSAP1 and analyzed the functional interplay of NuSAP1 with its interacting and proximal proteins.
View Article and Find Full Text PDFRecurrent FGFR2 and PIK3CA Mutations in Sialoblastoma.
Head Neck Pathol
September 2025
Department of Pathology, St. Jude Children's Research Hospital, Memphis, TN, USA.
Purpose: Sialoblastoma is an extremely rare low-grade malignant salivary gland neoplasm that presents at birth or early infancy and has heterogeneous clinical behavior. Due to its rarity, the molecular landscape remains incompletely characterized. We aimed to expand the current understanding of the genetic alterations in sialoblastoma through comprehensive molecular analysis.
View Article and Find Full Text PDF