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Embryonic Phase Transition/Separation on Hepatic Liquid Crystal Droplets Is Essential for Liver Development
Qinchun Duan1, Xixi Cao1, Xinjie Li1
1Laboratory of Cell Biology, Genetics and Developmental Biology, College of Life Sciences, Shaanxi Normal University, Xi'an 710062, China.
Biology
|July 28, 2026
Summary
Cellular phase transition is crucial in development and disease. Silkie chicken embryonic livers undergo a sudden shift from lipid to liquid crystal droplets, involving autophagy.
Area of Science:
- Cell Biology
- Biochemistry
- Developmental Biology
Background:
- Cellular phase transition, or phase separation, is vital in physiological events like P granules formation and implicated in diseases involving RNA-protein complexes (RNPs).
- Understanding the in situ molecular and cellular mechanisms of phase transition remains a significant challenge in biology and medicine.
Purpose of the Study:
- To investigate the molecular and cellular mechanisms of phase transition in situ during embryonic liver development.
- To characterize the observed massive phase transition in Taihe fowl (Silkie chicken) embryonic livers.
Main Methods:
- Histochemistry combined with polarization analysis and biochemical thin-layer chromatography.
- Characterization of birefringent Maltese crosses (MCs) indicative of liquid crystals (LC).
- Fluidity, in vitro thermal phase transition tests, and X-ray diffraction analysis.
Main Results:
- A sudden transition from hepatic lipid droplets (HLD) to hepatic liquid crystal droplets (HLCDs) was identified in Silkie chicken embryonic livers around embryonic day 12 (E12).
- HLCDs, identified by birefringent Maltese crosses, were composed of cholesterol, cholesterol ester, and lecithin, similar to cytoplasmic membrane components.
- Expressions of autophagy markers LC3A and Beclin 1 significantly increased and localized with HLCDs, suggesting a role for autophagy in this phase transition.
Conclusions:
- Autophagy, indicated by increased LC3A and Beclin 1, appears to play a regulatory role in the liquid crystal phase transition during embryonic liver development.
- The observed HLD to HLCD transition and the involvement of autophagy may offer insights into the pathogenesis of non-alcoholic fatty liver disease.
