Characteristics and expression profiles of circRNAs during abdominal adipose tissue development in Chinese Gushi chickens

PLoS One. 2021 Apr 15;16(4):e0249288. doi: 10.1371/journal.pone.0249288. eCollection 2021.

Abstract

Circular RNAs (circRNAs) play important roles in adipogenesis. However, studies on circRNA expression profiles associated with the development of abdominal adipose tissue are lacking in chickens. In this study, 12 cDNA libraries were constructed from the abdominal adipose tissue of Chinese domestic Gushi chickens at 6, 14, 22, and 30 weeks. A total of 1,766 circRNAs were identified by Illumina HiSeq 2500 sequencing. These circRNAs were primarily distributed on chr1 through chr10 and sex chromosomes, and 84.95% of the circRNAs were from gene exons. Bioinformatic analysis showed that each circRNA has 35 miRNA binding sites on average, and 62.71% have internal ribosome entry site (IRES) elements. Meanwhile, these circRNAs were primarily concentrated in TPM < 0.1 and TPM > 60, and their numbers accounted for 18.90% and 80.51%, respectively, exhibiting specific expression patterns in chicken abdominal adipose tissue. In addition, 275 differentially expressed (DE) circRNAs were identified by comparison analysis. Functional enrichment analysis showed that the parental genes of DE circRNAs were primarily involved in biological processes and pathways related to lipid metabolism, such as regulation of fat cell differentiation, fatty acid homeostasis, and triglyceride homeostasis, as well as fatty acid biosynthesis, fatty acid metabolism, and glycerolipid metabolism. Furthermore, ceRNA regulatory networks related to abdominal adipose development were constructed. The results of this study indicated that circRNAs can regulate lipid metabolism, adipocyte proliferation and differentiation, and cell junctions during abdominal adipose tissue development in chickens through complex ceRNA networks between circRNAs, miRNAs, genes, and pathways. The results of this study may help to expand the number of known circRNAs in abdominal adipose tissue and provide a valuable resource for further research on the function of circRNAs in chicken abdominal adipose tissue.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Abdominal Fat / growth & development
  • Abdominal Fat / metabolism*
  • Aging / genetics
  • Animals
  • Binding Sites
  • Cell Differentiation / genetics
  • Chickens / genetics
  • Gene Library
  • Gene Regulatory Networks / genetics
  • Lipid Metabolism / genetics
  • MicroRNAs / chemistry
  • MicroRNAs / metabolism
  • RNA, Circular / metabolism*
  • Transcriptome

Substances

  • MicroRNAs
  • RNA, Circular

Grants and funding

This study was funded by a grant from the National Natural Science Foundation of China (32072692 and 31572356), the Program for Innovation Research Team of Ministry of Education (IRT16R23) and the Scientific Studio of Zhongyuan Scholars (No. 30601985).