Acta Veterinaria et Zootechnica Sinica ›› 2023, Vol. 54 ›› Issue (9): 3653-3663.doi: 10.11843/j.issn.0366-6964.2023.09.007

• ANIMAL GENETICS AND BREEDING • Previous Articles     Next Articles

Regulation Effect of PSMD9 on Lipid Deposition in Goat Precursor Adipocytes

SHAO Peng1, TANG Yinmei1,2, LIN Yaqiu1, WANG Yong1, XIANG Hua1, HUANG Lian1,2*, ZHU Jiangjiang1,2*   

  1. 1. Key Laboratory of Conservation and Utilization of Animal Genetic Resources on Qinghai-Tibet Plateau of Sichuan Province/Ministry of Education, Southwest Minzu University, Chengdu 610207, China;
    2. Institute of Tibetan Plateau Research, Southwest Minzu University, Chengdu 610207, China
  • Received:2023-02-24 Published:2023-09-22

Abstract: The study aimed to clone the PSMD9 gene sequence of goat and conduct the bioinformatics analysis. Then, the expression of PSMD9 in different tissues of goat and the expression level in intramuscular preadipocytes at different stages of differentiation was detected, and further revealed the effect of overexpression and interference of PSMD9 on lipid deposition in goat intramuscular preadipocytes. In this study, the sequence of PSMD9 gene was obtained by T-A cloning technique using 1-week-old healthy Jianzhou big-eared male goats (n=12), bioinformatics analysis was performed, and PSMD9 overexpression vector was constructed by double digestion method. PSMD9 was overexpressed in goat intramuscular adipocytes using liposome transfection, and the small interfering RNA (siRNA) interfered with PSMD9 expression. The effect of PSMD9 on lipid droplet formation was observed by Oil Red O staining and triglyceride content was measured by GPO-Trinder enzymatic reaction. The expression levels of PSMD9 in different tissues of goats and different stages of differentiation in intramuscular preadipocytes were measured by real-time quantitative PCR (RT-qPCR). The results showed that 763 bp nucleotide sequence of goat PSMD9 gene was obtained, including 5'UTR 67 bp, CDS 564 bp, and 3'UTR 132 bp, encoding 187 amino acid residues. The expression of PSMD9 gene in goat was highest in the liver and lowest in the spleen, and its expression level decreased gradually in goat precursor adipocytes in the former 4 days of differentiation induction, subsequently increased, and the expression level was the highest on the 8th day. Overexpression of the PSMD9 gene significantly increased the lipid droplets and triglyceride content in intramuscular preadipocytes and significantly up-regulated the relative expression of DGAT2, FASN and ACC, while the expression of DGAT1, PPARγ and SCD1 did not significantly changed. Interfering with PSMD9 gene decreased the lipid droplets and triglyceride content in intramuscular preadipocytes, while significantly down-regulated the expression of DGAT1, PPARγ, FASN and ACC, the expression of DGAT2 and SCD1 did not significantly changed. In this research, the CDS region sequence of PSMD9 gene was successfully obtained and its expression was highest in liver tissue. The expression of PSMD9 gene decreased gradually during differentiation in intramuscular adipocytes and reached the lowest level at day 4 in goat, after which the expression gradually increased.The expression of PSMD9 can significantly promote lipid deposition in goat's intramuscular preadipocytes. These results provide important data support for further elucidating the mechanism of PSMD9 gene regulating the formation of intramuscular fat in goat.

Key words: goat, PSMD9, RNA interference, overexpression, intramuscular precursor adipocytes

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