Feng S, Wang H, Li X, Li W, Bai Z. Gene identification and functional analysis of a D-type cyclin (CCND2) in freshwater pearl mussel (Hyriopsis cumingii).
Mol Biol Rep 2022;
49:6601-6611. [PMID:
35616759 DOI:
10.1007/s11033-022-07501-2]
[Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2021] [Accepted: 04/21/2022] [Indexed: 11/27/2022]
Abstract
BACKGROUND
Cyclin D (CCND) plays an important role in the cell cycle and is a rate-limiting factor that facilitates the G1/S transition.
METHODS
In this study, the full-length cDNA of Hc-CCND2 was isolated from freshwater pearl mussel (Hyriopsis cumingii; Hc) and amplified using the 3´/5´ RACE system. The Hc-CCND2 expression profiles were analysed by quantitative real-time PCR. Functional analysis of the Hc-CCND2 genes was examined by both RNA interference (RNAi) and overexpression in H. cumingii.
RESULTS
Hc-CCND2 protein sequences were 295 amino acids long, possessed D-type cyclin signature motifs and contained conserved cyclin box domains. Hc-CCND2 was expressed in all examined tissues (adductor, foot, visceral mass, gill, outer mantle, inner mantle and gonad), with the highest expression levels found in the gill (P < 0.05). During the different developmental periods of the embryo, the relative expression of Hc-CCND2 increased with embryonic development, peaking at the blastula stage and decreasing significantly in the gastrula stage. After knockdown of Hc-CCND2 by RNAi, a significant decrease in CDK6 expression levels was found, while the percentage of cells in the G0/G1 phase significantly increased. Overexpression of Hc-CCND2 in mantle cells led to increased proliferation of cultured cells (P < 0.05).
CONCLUSIONS
Our results demonstrated that Hc-CCND2 may promote cell cycle progression in H. cumingii, and that overexpression of Hc-CCND2 promotes mantle cell proliferation. These findings may provide a novel approach for improving the slow proliferation rate of shellfish cells in in vitro cultures.
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