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Related Concept Videos

Huntington Disease l: Introduction01:21

Huntington Disease l: Introduction

Huntington disease or HD is a progressive, fatal neurodegenerative disorder inherited in an autosomal dominant pattern.PathophysiologyIt is caused by expansion of the CAG trinucleotide repeat in the HTT gene on chromosome 4 (4p16.3), producing an abnormal huntingtin protein with an expanded polyglutamine tract. This misfolded protein disrupts cellular function, leading to neuronal death. Normal alleles have ≤26 repeats, 27–35 are intermediate (risk of expansion), 36–39 show reduced penetrance,...

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Related Experiment Video

Updated: Jun 27, 2026

Fractionation for Resolution of Soluble and Insoluble Huntingtin Species
07:08

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Crowder Induced Phase Separation Modulates the Huntingtin Protein Aggregation Landscape.

Apurva Mishra1, Shivani Banger1, Pramit K Chowdhury1

  • 1Department of Chemistry, Indian Institute of Technology Delhi, Hauz Khas, New Delhi 110016, India.

Biochemistry
|April 16, 2026
PubMed
Summary
This summary is machine-generated.

Cellular crowding significantly impacts protein aggregation. This study reveals how mixed macromolecular crowders, like PEG and Dextran, create complex aggregation pathways and spatial organization, mimicking in-cell conditions.

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Area of Science:

  • Biochemistry
  • Cell Biology
  • Biophysics

Background:

  • Macromolecular crowding is crucial in cellular environments, influencing protein aggregation dynamics.
  • Understanding these effects is vital for comprehending cellular processes and disease mechanisms.

Purpose of the Study:

  • To investigate the impact of mixed macromolecular crowders on the aggregation of Huntingtin exon-1 protein (HD39Q).
  • To explore how varying crowder combinations and concentrations modulate protein aggregation pathways and localization.

Main Methods:

  • Utilized thioflavin-T (ThT) kinetics to monitor aggregation rates.
  • Employed confocal imaging with labeled proteins and crowders to visualize phase separation and protein distribution.
  • Studied both binary and ternary crowder systems to mimic cellular complexity.

Main Results:

  • Binary crowder mixtures (PEG8, Dextran, Ficoll 70) induced biphasic aggregation kinetics, deviating from simple models.
  • Crowder mixtures led to phase separation, influencing aggregation pathways distinctly based on composition.
  • Ternary crowder systems formed hierarchical droplet architectures, further altering aggregation and protein localization.
  • Aggregation and partitioning were dependent on biomolecule properties and the specific phase composition.

Conclusions:

  • Mixed macromolecular crowding significantly reshapes protein aggregation landscapes in vitro.
  • These complex crowding environments add spatial and temporal complexity, offering more physiologically relevant models.
  • Findings provide insights into disease mechanisms involving protein aggregation, such as Huntington's disease.