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The histone proteins in the nucleosomes are post-translationally modified (PTM) to increase or decrease access to DNA. The commonly observed PTMs are methylation, acetylation, phosphorylation, and ubiquitination of lysine amino acids in the histone H3 tail region. These histone modifications have specific meaning for the cell. Hence, they are called "histone code". The protein complex involved in histone modification is termed as "reader-writer" complex.
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Each human somatic cell contains 6 billion base-pairs of DNA. Each base-pair is 0.34 nm long, which means that each diploid cell contains a staggering 2 meters of DNA. How is such a long DNA strand packed inside a nucleus measuring only 10 - 20 microns in diameter? 
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The extent of chromatin compaction can be studied by staining chromatin using specific DNA binding dyes. Under the microscope, the dense-compacted regions take up more dye, appearing darker, while the less-compact areas take up less dye and appear lighter. Based on the compaction level, chromatins are classified into two primary forms – euchromatin and heterochromatin.
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Condensate-driven chromatin organization via elastocapillary interactions.

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    Nuclear condensates and chromatin are interdependent, with phase separation physics governing their interactions. This study reveals how wetting properties and chromatin stiffness shape condensate morphology and function.

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    Area of Science:

    • Cell Biology
    • Biophysics
    • Genomics

    Background:

    • Biomolecular condensates are crucial for genome organization and function within eukaryotic cells.
    • Nuclear condensates, formed by proteins and RNA, exhibit diverse morphologies driven by phase separation around chromatin.
    • The physical principles governing condensate-chromatin interactions and their impact on genome organization are not fully understood.

    Purpose of the Study:

    • To develop and validate a mesoscopic model integrating phase separation physics and chromatin mechanics.
    • To investigate the roles of wetting properties and chromatin stiffness in shaping nuclear condensate morphology.
    • To elucidate the reciprocal relationship between condensates and chromatin mechanics.

    Main Methods:

    • Computational modeling combined with experimental validation.
    • Utilized canonical condensate proteins: heterochromatin protein 1 alpha (HP1α) and bromodomain-containing protein 4 (BRD4).
    • Investigated condensate morphology, wetting properties, and chromatin mechanics.

    Main Results:

    • Wetting properties and chromatin stiffness dictate condensate morphology.
    • Nuclear condensates actively remodel chromatin mechanics and organization.
    • Elastocapillarity governs the interplay between condensate interfacial tension and chromatin deformation, explaining emergent behaviors beyond simple liquid-liquid phase separation (LLPS).

    Conclusions:

    • Nuclear condensates and chromatin exhibit a fundamental interdependence.
    • Biomolecular wetting properties significantly influence genome organization, transcriptional regulation, and epigenetic control.
    • The developed model and methodologies offer a generalizable framework for studying multiphase soft matter systems in biological and synthetic contexts.