A novel long non-coding RNA connects obesity to impaired adipocyte function

Area of Science:

• Molecular Biology
• Genetics
• Metabolic Diseases

Background:

• Long non-coding RNAs (lncRNAs) play vital roles in adipocytes, and their dysfunction contributes to obesity.
• Transcriptomic analysis identified 496 lncRNAs associated with obesity, with linc-GALNTL6-4 showing significant recovery after bariatric surgery.

Purpose of the Study:

• To investigate the impact of impaired adipose linc-GALNTL6-4 expression in obese individuals.
• To explore the clinical value and functional role of linc-GALNTL6-4 in adipocyte function and obesity.

Main Methods:

• Transcriptomic analysis of public datasets and validation in human cohorts.
• Functional studies in human adipocyte cultures, including loss-of-function and gain-of-function models.
• Genome-wide transcriptomics and untargeted lipidomics to assess molecular implications.

Main Results:

• Adipocyte-specific linc-GALNTL6-4 expression co-segregates with obesity and normalizes with weight loss.
• Compromised linc-GALNTL6-4 expression in obesity is linked to inflammation; its upregulation is essential for adipogenesis.
• Knockdown impairs adipogenesis and alters lipid metabolism, while gain-of-function improves adipocyte phenotype and triglyceride metabolism, potentially via APOC1 regulation.

Conclusions:

• Adipocyte-specific linc-GALNTL6-4 is a novel modulator of lipid homeostasis, significantly impacted by obesity and meta-inflammation.
• This lncRNA holds potential as a therapeutic target for managing obesity-related metabolic dysfunction.