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PLIN1a: the principal protein isoform that performs the function of chicken PLIN1
Xue Han1,2,3, Xun Zhou1,2,3, Jie Liu1,2,3
1Key Laboratory of Chicken Genetics and Breeding, Ministry of Agriculture and Rural Affairs, Harbin, Heilongjiang, China.
Frontiers in Cell and Developmental Biology
|August 15, 2026
Summary
Researchers identified five new chicken PLIN1 transcript variants, revealing four protein isoforms crucial for lipid droplet regulation. These isoforms play conserved roles in cell proliferation and adipogenesis, with PLIN1a showing the strongest effects.
Area of Science:
- Molecular Biology
- Cell Biology
- Biochemistry
Background:
- Perilipin 1 (PLIN1) is a key protein regulating lipid droplets (LDs) in birds.
- Existing databases show 10 chicken PLIN1 transcripts, but only one is experimentally confirmed.
Purpose of the Study:
- To identify and characterize novel chicken PLIN1 transcript variants and protein isoforms.
- To investigate the functional roles of PLIN1 isoforms in lipid metabolism and cell differentiation.
Main Methods:
- RNA ligase-mediated rapid amplification of cDNA ends (RLM-RACE) to identify transcript variants.
- Immunolocalization assays to determine protein localization on LDs.
- Functional assays to assess roles in cell proliferation, adipogenesis, and LD formation.
Main Results:
- Five distinct chicken PLIN1 transcript variants were identified, encoding four N-terminally different protein isoforms.
- All PLIN1 isoforms localize to LDs during preadipocyte differentiation.
- PLIN1 isoforms inhibit cell proliferation, promote adipogenic differentiation, and facilitate Fsp27-mediated supersized LD formation.
- PLIN1a isoform demonstrated the most potent regulatory effects in functional assays.
Conclusions:
- This study clarifies the transcript diversity and functional specialization of avian PLIN1.
- Findings offer insights into the structural basis of LD regulation and vertebrate lipid metabolism.
- The identified PLIN1 isoforms contribute to understanding lipid storage and metabolic adaptation.
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