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ERK activation dynamics in maturing oocyte controls embryonic nuclear divisions in Caenorhabditis elegans.
Cell Rep
January 2025
Genetics and Epigenetics Program, University of Texas MD Anderson Cancer Center and The University of Texas MD Anderson Cancer Center UTHealth Houston Graduate School of Biomedical Sciences, Houston, TX, USA; Department of Genetics, University of Texas MD Anderson Cancer Center and The University of Texas MD Anderson Cancer Center UTHealth Houston Graduate School of Biomedical Sciences, Houston, TX, USA. Electronic address:
ERK activity oscillates between sustained activation during oocyte formation and transient inactivation during oocyte maturation, fertilization, and early embryogenesis. Consequences of ectopic ERK activity upon oocyte maturation and in early embryogenesis are unknown. We show, in Caenorhabditis elegans, that ectopic ERK activity upon oocyte maturation (metaphase I oocytes) results in embryos with abnormalities in nuclear divisions leading to embryonic death.
View Article and Find Full Text PDFMechanical Properties of Eye Lens Cortical and Nuclear Membranes and the Whole Lens.
Invest Ophthalmol Vis Sci
January 2025
Department of Physics, Boise State University, Boise, Idaho, United States.
Purpose: To elucidate the mechanical properties of the bovine lens cortical membrane (CM), the nuclear membrane (NM) containing cholesterol bilayer domains (CBDs), and whole bovine lenses.
Methods: The total lipids (lipids plus cholesterol) from the cortex and nucleus of a single bovine lens were isolated using the monophasic methanol extraction method. Supported CMs and NMs were prepared from total lipids extracted from the cortex and nucleus, respectively, using a rapid solvent exchange method and probe-tip sonication, followed by the fusion of unilamellar vesicles on a flat, freshly cleaved mica surface.
Perinuclear organelle trauma at the nexus of cardiomyopathy pathogenesis arising from loss of function mutation.
Nucleus
December 2025
Center for Translational Medicine, Department of Medicine, Thomas Jefferson University, Philadelphia, PA, USA.
Over the past 25 years, nuclear envelope (NE) perturbations have been reported in various experimental models with mutations in the gene. Although the hypothesis that NE perturbations from mutations are a fundamental feature of striated muscle damage has garnered wide acceptance, the molecular sequalae provoked by the NE damage and how they underlie disease pathogenesis such as cardiomyopathy ( cardiomyopathy) remain poorly understood. We recently shed light on one such consequence, by employing a cardiomyocyte-specific deletion in the adult heart.
View Article and Find Full Text PDFCul3 substrate adaptor SPOP targets Nup153 for degradation.
Mol Biol Cell
January 2025
Department of Chemistry and Biochemistry, University of California, Los Angeles, Los Angeles, CA 90095, USA.
SPOP is a Cul3 substrate adaptor responsible for the degradation of many proteins related to cell growth and proliferation. Because mutation or misregulation of SPOP drives cancer progression, understanding the suite of SPOP substrates is important to understanding the regulation of cell proliferation. Here, we identify Nup153, a component of the nuclear basket of the nuclear pore complex, as a novel substrate of SPOP.
View Article and Find Full Text PDFChromosome mis-segregation triggers cell cycle arrest through a mechanosensitive nuclear envelope checkpoint.
Nat Cell Biol
January 2025
CNRS UMR144 - UMR3664, Institut Curie, Sorbonne Université, PSL Research University, Paris, France.
Errors during cell division lead to aneuploidy, which is associated with genomic instability and cell transformation. In response to aneuploidy, cells activate the tumour suppressor p53 to elicit a surveillance mechanism that halts proliferation and promotes senescence. The molecular sensors that trigger this checkpoint are unclear.
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