Molecular characterization and expression analysis of the autophagic gene Beclin 1 from the purse red common carp (Cyprinus carpio) exposed to cadmium

Gao, D., Xu, Z., Kuang, X., Qiao, P., Liu, S., Zhang, L., He, P., Jadwiga, W.S., Wang, Y., and Min, W.
Comparative biochemistry and physiology. Toxicology & pharmacology : CBP   160: 15-22 (Journal)
Registered Authors
Kuang, Xia
Autophagy, Beclin 1, Cadmium, Common carp, Heavy metal
MeSH Terms
  • Amino Acid Sequence
  • Animals
  • Apoptosis Regulatory Proteins/biosynthesis
  • Apoptosis Regulatory Proteins/chemistry*
  • Apoptosis Regulatory Proteins/genetics*
  • Autophagy/drug effects
  • Autophagy/genetics*
  • Cadmium/toxicity*
  • Carps
  • Fish Proteins/biosynthesis
  • Fish Proteins/chemistry*
  • Fish Proteins/genetics*
  • Gene Expression Regulation*/drug effects
  • Humans
  • Kidney/drug effects
  • Kidney/metabolism
  • Kidney/pathology
  • Molecular Sequence Data
  • Phylogeny
24291087 Full text @ Comp. Biochem. Physiol. C Toxicol. Pharmacol.

Beclin 1, the mammalian orthologue of yeast Atg6, has a central role in autophagy, which has been linked to diverse biological processes including immunity, development, tumor suppression, lifespan extension, etc. However, the relevant study about Beclin 1 is rare in fish compared with mammals. In this study, we isolated Beclin 1 gene from the kidney tissue of common carp (Cyprinus carpio) using rapid amplification of cDNA ends (RACE). The deduced amino acid sequence of cloned Beclin 1 comprised 447 amino acids, which showed approximately 80.7% identity and 88.9% similarity to human Beclin 1. It possessed a typical Bcl-2 homology domain 3 (BH3) and an evolutionarily conserved domain (ECD). Phylogenetic analysis demonstrated that common carp Beclin 1 formed a clade with zebrafish Beclin 1. To explore the relationship between Beclin 1 and cadmium (Cd)-induced injury, a Cd exposure experiment was conducted. The result showed that Cd content was significantly increased in a dose-dependent manner in kidney after Cd exposure. Swelling and vacuolation of renal tubular epithelial cells, and glomerular hyalinization were observed. Renal leukocyte infiltration was diffusely distributed in the interstitial tissue. Real-time quantitative RT-PCR analysis revealed that the mRNA transcript level of Beclin 1 was markedly up-regulated in a dose-dependent and time-dependent manner after exposure to Cd. Similarly, Western blot analysis indicated that its protein level was significantly elevated in a dose-dependent manner after Cd treatment. All the results indicate that the common carp Beclin 1 gene may play a regulatory role against Cd toxicity.

Genes / Markers
Mutations / Transgenics
Human Disease / Model
Sequence Targeting Reagents
Engineered Foreign Genes