IRLnc: a novel functional noncoding RNA contributes to intramuscular fat deposition

Area of Science:

• Genomics
• Molecular Biology
• Animal Science

Background:

• Intramuscular fat (IMF) impacts meat quality and animal insulin resistance.
• Understanding IMF genetic mechanisms is crucial for pork quality and metabolic disease research.

Purpose of the Study:

• To investigate the genetic and long intergenic non-coding RNA (lincRNA) effects on IMF.
• To identify novel genes and lincRNAs regulating IMF decomposition.

Main Methods:

• RNA sequencing on an IMF trait segregation population.
• Real-time quantitative polymerase chain reaction (RT-qPCR) for gene expression validation.
• RNA interference (RNAi) for loss-of-function studies and in-situ hybridization for co-expression analysis.

Main Results:

• Identified 26 differentially expressed genes, including six lincRNAs.
• Discovered a conserved lincRNA, IRLnc, with conserved downstream genes in pigs and humans.
• Demonstrated that IRLnc silencing inhibits NR4A3 expression, suggesting a regulatory role.

Conclusions:

• Identified IRLnc as a novel functional noncoding RNA contributing to IMF.
• IRLnc regulates NR4A3 expression, impacting IMF decomposition.
• Findings suggest therapeutic targets for insulin resistance and methods for meat quality enhancement.