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Related Concept Videos

Non-nuclear Inheritance01:29

Non-nuclear Inheritance

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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.
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Protons and neutrons, collectively called nucleons, are packed together tightly in a nucleus. With a radius of about 10−15 meters, a nucleus is quite small compared to the radius of the entire atom, which is about 10−10 meters. Nuclei are extremely dense compared to bulk matter, averaging 1.8 × 1014 grams per cubic centimeter. If the earth’s density were equal to the average nuclear density, the earth’s radius would be only about 200 meters.
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Before mRNAs are exported to the cytoplasm, it is crucial to check each mRNA for structural and functional integrity. Eukaryotic cells use several different mechanisms, collectively known as mRNA surveillance, to look for irregularities in mRNAs. Irregular or aberrant mRNA are rapidly degraded by various enzymes. If a defective mRNA escapes the surveillance, it would be translated into a protein which would either be non-functional or not function properly. One of the primary irregularities in...
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Related Experiment Video

Updated: Jan 25, 2026

A Cell-Free Assay Using Xenopus laevis Embryo Extracts to Study Mechanisms of Nuclear Size Regulation
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Nuclear (Bio)physics in the Embryo.

Stanislav Y Shvartsman1, Matej Krajnc2

  • 1Department of Chemical and Biological Engineering, Princeton University, Princeton, NJ 08544, USA; Lewis-Sigler Institute for Integrative Genomics, Princeton University, Princeton, NJ 08544, USA; Department of Molecular Biology, Princeton University, Princeton, NJ 08544, USA.

Cell
|May 4, 2019
PubMed
Summary
This summary is machine-generated.

Dynamic interactions between cell cycle and actomyosin contractility synchronize nuclear divisions in early Drosophila embryos. This self-organizing process ensures uniform distribution of nuclei before zygotic gene activation.

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Area of Science:

  • Developmental Biology
  • Cell Biology
  • Biophysics

Background:

  • Early embryonic development relies on precise spatial and temporal coordination of cellular events.
  • The interplay between cell cycle progression and cytoskeletal dynamics is crucial for embryonic patterning.
  • Understanding self-organizing principles is key to deciphering early developmental mechanisms.

Purpose of the Study:

  • To investigate the mechanisms synchronizing nuclear cleavages in the early Drosophila embryo.
  • To elucidate the role of actomyosin contractility in nuclear division and cytoplasmic organization.
  • To determine the contribution of self-organizing processes prior to zygotic transcription.

Main Methods:

  • Live imaging of nuclear cleavages and cytoplasmic flow in Drosophila embryos.
  • Perturbation experiments to analyze the roles of cell cycle regulators and cytoskeletal components.
  • Computational modeling to simulate the observed dynamic interactions.

Main Results:

  • Dynamic interactions between cell cycle and actomyosin contractility were found to synchronize nuclear cleavages.
  • A coordinated cytoplasmic flow was generated, leading to a spatially uniform distribution of zygotic nuclei.
  • These self-organizing mechanisms operate effectively before the activation of zygotic transcription.

Conclusions:

  • The study reveals a novel self-organizing mechanism for achieving nuclear uniformity in early embryos.
  • Actomyosin contractility plays a critical role in synchronizing nuclear divisions and organizing cytoplasmic contents.
  • These findings highlight the importance of pre-transcriptional self-organization in developmental processes.