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Related Concept Videos

The Nucleolus02:55

The Nucleolus

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The nucleolus is the most prominent substructure of the nucleus. When it was first discovered, it was considered to be an isolated organelle that forms fibrils and granules. In 1931, the relationship between the nucleolus and chromosomes was first described by Heitz. He observed that the appearance and size of nucleolus varies depending on the stage of the cell cycle. He also noticed constricted regions on different chromosomes clustered together at definite cell cycle stages. These regions,...
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Nucleosomes are the basic units of chromatin compaction. Each nucleosome consists of the DNA bound tightly around a histone core, which makes the DNA inaccessible to DNA binding proteins such as DNA polymerase and RNA polymerase. Hence, the fundamental problem is to ensure access to DNA when appropriate, despite the compact and protective chromatin structure.
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Regulation of Nuclear Protein Sorting01:45

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Nuclear protein sorting regulates nucleus composition and gene expression, crucial for determining the fate of a eukaryotic cell. Hence, the entry and exit of molecules across the nuclear envelope is a tightly controlled process. Nuclear protein sorting can be inhibited by one of the following ways: 1) masking cargo signal sequences, 2) modifying the nuclear receptor's affinity for cargo, 3) controlling the nuclear pore size, 4) retaining the cargo during its transit to the cytosol or the...
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Nuclear Protein Sorting01:34

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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.
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Chromatin is the massive complex of DNA and proteins packaged inside the nucleus. The complexity of chromatin folding and how it is packaged inside the nucleus greatly influences  access to genetic information. Generally, the nucleus' periphery is considered transcriptionally repressive, while the cell's interior is considered a transcriptionally active area. 
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In eukaryotic cells, nascent mRNA transcripts need to undergo many post-transcriptional modifications to reach the cell cytoplasm and translate into functional proteins. For a long time, transcription and pre-mRNA processing were considered two independent events that occur sequentially in the cell. However, it has now been well established that transcription and pre-mRNA processing are two simultaneous processes that are precisely regulated inside the cell.
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Quantitative Analysis of Chromatin Proteomes in Disease
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Tuning between Nuclear Organization and Functionality in Health and Disease.

Naresh Kumar Manda1, Upendarrao Golla2,3, Kishore Sesham4

  • 1Department of Biochemistry, School of Life Sciences, University of Hyderabad, Hyderabad 500046, India.

Cells
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Summary

The nucleus

Keywords:
cancerneurodegenerative disordersnuclear envelope proteinsnuclear laminsnuclear shape regulationnuclear size regulationnucleopathynucleophagysignaling pathwaystargeted therapy

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Area of Science:

  • Cell Biology
  • Genomics
  • Biophysics

Background:

  • The eukaryotic nucleus, a complex and dynamic organelle, organizes the genome within the cytoplasm.
  • Nuclear architecture is shaped by chromatin, the nuclear envelope, and mechanical signaling.
  • Nuclear size and shape influence cell function and disease, making their maintenance critical.

Purpose of the Study:

  • To review the molecular mechanisms regulating nuclear morphology and function.
  • To highlight components governing nuclear organization and consequences of aberrations.
  • To discuss diagnostic and therapeutic strategies targeting nuclear morphology.

Main Methods:

  • Literature review of nuclear organization, mechanics, and disease.
  • Analysis of nuclear envelope morphology and its functional implications.
  • Synthesis of current knowledge on nuclear structure-function relationships.

Main Results:

  • Nuclear morphology is influenced by chromatin, nuclear envelope, and cytoskeletal interactions.
  • Abnormal nuclear shapes are linked to cancer, aging, and neuro-muscular diseases.
  • Understanding nuclear organization is key to cell viability and disease pathology.

Conclusions:

  • Nuclear structure plays a critical role in cell function and overall health.
  • Aberrant nuclear morphology has significant implications for human diseases.
  • Targeting nuclear morphology offers potential diagnostic and therapeutic avenues.