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Single-nucleus and bulk RNA sequencing reveal cellular and transcriptional mechanisms underlying lipid dynamics in high marbled pork

文献类型： 外文期刊

作者： Wang, Liyi 1 ; Zhao, Xueyan 4 ; Liu, Shiqi 1 ; You, Wenjing 1 ; Huang, Yuqin 1 ; Zhou, Yanbing 1 ; Chen, Wentao 1 ; Zhang, Shu 1 ; Wang, Jiying 4 ; Zheng, Qiankun 5 ; Wang, Yizhen 1 ; Shan, Tizhong 1 ;

作者机构： 1.Zhejiang Univ, Coll Anim Sci, Hangzhou, Peoples R China

2.Zhejiang Univ, Key Lab Mol Anim Nutr, Minist Educ, Hangzhou, Peoples R China

3.Key Lab Anim Feed & Nutr Zhejiang Prov, Hangzhou, Peoples R China

4.Shandong Acad Agr Sci, Inst Anim Sci & Vet Med, Jinan 250100, Peoples R China

5.DELISI Grp Co Ltd, Weifang, Shandong, Peoples R China

期刊名称：NPJ SCIENCE OF FOOD （ 影响因子：6.4； 五年影响因子：8.3 ）

ISSN：

年卷期： 2023 年 7 卷 1 期

页码：

收录情况： SCI

摘要： Pork is the most consumed meat in the world, and its quality is associated with human health. Intramuscular fat (IMF) deposition (also called marbling) is a key factor positively correlated with various quality traits and lipo-nutritional values of meat. However, the cell dynamics and transcriptional programs underlying lipid deposition in highly marbled meat are still unclear. Here, we used Laiwu pigs with high (HLW) or low (LLW) IMF contents to explore the cellular and transcriptional mechanisms underlying lipid deposition in highly-marbled pork by single-nucleus RNA sequencing (snRNA-seq) and bulk RNA sequencing. The HLW group had higher IMF contents but less drip loss than the LLW group. Lipidomics results revelled the changes of overall lipid classes composition (e.g., glycerolipids including triglycerides, diglycerides, and monoglycerides; sphingolipids including ceramides and monohexose ceramide significantly increased) between HLW and LLW groups. SnRNA-seq revealed nine distinct cell clusters, and the HLW group had a higher percentage of adipocytes (1.40% vs. 0.17%) than the LLW group. We identified 3 subpopulations of adipocytes, including PDE4D(+)/PDE7B(+) (in HLW and LLW), DGAT2(+)/SCD+ (mostly in HLW) and FABP5(+)/SIAH1(+) cells (mostly in HLW). Moreover, we showed that fibro/adipogenic progenitors could differentiate into IMF cells and contribute to 43.35% of adipocytes in mice. In addition, RNA-seq revealed different genes involved in lipid metabolism and fatty acid elongation. Our study provides new insights into the cellular and molecular signatures of marbling formation; such knowledge may facilitate the development of new strategies to increase IMF deposition and the lipo-nutritional quality of high marbled pork.

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