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He X, Xu J, Liu Y, Guo X, Wei W, Xing C, Zhang H, Wang H, Liu M, Jiang R. Explorations on Key Module and Hub Genes Affecting IMP Content of Chicken Pectoralis Major Muscle Based on WGCNA. Animals (Basel) 2024; 14:402. [PMID: 38338044 PMCID: PMC10854493 DOI: 10.3390/ani14030402] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2023] [Revised: 01/09/2024] [Accepted: 01/24/2024] [Indexed: 02/12/2024] Open
Abstract
Inosine monophosphate (IMP) is a substance that enhances flavor and plays a crucial role in the umami taste of chicken muscle. It is also an influential factor in determining chicken's economic value. However, the molecular regulatory network underlying the IMP content in muscle remains unclear. To address this issue, we performed transcriptome sequencing on 20 pectoralis major muscle samples from 120-day-old Guangde feathered-leg chicken and used weighted gene co-expression network analysis (WGCNA) to identify key regulatory factors that influence IMP content. The weighted gene co-expression network was constructed using a total of 16,344 genes, leading to the identification of 20 co-expression gene modules. Among the modules that were identified, it was observed that the purple module (R = -0.51, p = 0.02) showed a significant negative correlation with the IMP content. This suggests that the genes within the purple module had the ability to regulate the IMP content. A total of 68 hub genes were identified in the purple module through gene significance (GS) > 0.2 and module membership (MM) > 0.8. The STRING database was used for a protein-protein interaction (PPI) network of hub genes. Furthermore, troponin I type 1 (TNNI1), myozenin 2 (MYOZ2), myosin light chain 2 regulatory cardiac slow (MYL2), and myosin light chain 3 regulatory cardiac slow (MYL3) involved in the "ATP-dependent activity", "cAMP signaling pathway" and "cGMP-PKG signaling pathway" were identified as central regulators that contribute to IMP content. These results offer valuable information into the gene expression and regulation that affects IMP content in muscle.
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Affiliation(s)
| | | | | | | | | | | | | | | | | | - Runshen Jiang
- College of Animal Science and Technology, Anhui Agricultural University, Hefei 230036, China; (X.H.); (J.X.); (Y.L.); (X.G.); (W.W.); (C.X.); (H.Z.); (H.W.); (M.L.)
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Li Y, Zhou T, Zhuang J, Dai Y, Zhang X, Bai S, Zhao B, Tang X, Wu X, Chen Y. Effects of feeding restriction on skeletal muscle development and functional analysis of TNNI1 in New Zealand white rabbits. Anim Biotechnol 2023; 34:4435-4447. [PMID: 36520026 DOI: 10.1080/10495398.2022.2155662] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
While restricting nutrition can improve diseases related to the digestive tract, excessive restriction of food intake can also lead to malnutrition and delayed physical growth. Therefore, this brings the demand to study the effect and potential mechanism of restricted feeding on skeletal muscle development in rabbits. This study utilized hematoxylin-eosin (HE) staining to detect muscle fiber area which depicted significant reduction in skeletal muscle fiber upon 30% feed restriction (p < 0.05). The control group and 30% feed restricted group showed 615 deferentially expressed genes (DEGs). Through the GO and KEGG functional enrichment analysis demonstrated 28 DEGs related to muscle development. KEGG analysis showed enrichment of pathways including PI3K/Akt signaling pathway, MAPK signaling pathway, and Hedgehog signaling pathway. Further, the full length of troponin I1, slow skeletal type (TNNI1) was cloned. We studied the expression of skeletal muscle differentiation-related genes such as MyoD, Myf5 gene and Desmin. Specifically, the TNNI1 gene overexpression and knockdown studies were conducted. The over-expression of TNNI1 significantly enhanced the expression of the skeletal muscle development-related genes. Contrastingly, the silencing of TNNI1 gene reduced the expression significantly. These findings showed that TNNI1 may be a regulator for regulating the expression of muscle development-related genes.
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Affiliation(s)
- Yunpeng Li
- College of Animal Science and Technology, Yangzhou University, Jiangsu, China
| | - Tong Zhou
- College of Animal Science and Technology, Yangzhou University, Jiangsu, China
| | - Junyi Zhuang
- College of Animal Science and Technology, Yangzhou University, Jiangsu, China
| | - Yingying Dai
- College of Animal Science and Technology, Yangzhou University, Jiangsu, China
| | - Xiyu Zhang
- College of Animal Science and Technology, Yangzhou University, Jiangsu, China
| | - Shaocheng Bai
- College of Animal Science and Technology, Yangzhou University, Jiangsu, China
| | - Bohao Zhao
- College of Animal Science and Technology, Yangzhou University, Jiangsu, China
| | - Xianwei Tang
- Jiangsu Pizhou Orient Breeding Co., Ltd, Jiangsu, China
| | - Xinsheng Wu
- College of Animal Science and Technology, Yangzhou University, Jiangsu, China
| | - Yang Chen
- College of Animal Science and Technology, Yangzhou University, Jiangsu, China
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Li X, Lu L, Tong X, Li R, Jin E, Ren M, Gao Y, Gu Y, Li S. Transcriptomic Profiling of Meat Quality Traits of Skeletal Muscles of the Chinese Indigenous Huai Pig and Duroc Pig. Genes (Basel) 2023; 14:1548. [PMID: 37628600 PMCID: PMC10454112 DOI: 10.3390/genes14081548] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2023] [Revised: 07/24/2023] [Accepted: 07/25/2023] [Indexed: 08/27/2023] Open
Abstract
The Huai pig is a well-known indigenous pig breed in China. The main advantages of Huai pigs over Western commercial pig breeds include a high intramuscular fat (IMF) content and good meat quality. There are significant differences in the meat quality traits of the same muscle part or different muscle parts of the same variety. To investigate the potential genetic mechanism underlying the meat quality differences in different pig breeds or muscle groups, longissimus dorsi (LD), psoas major (PM), and biceps femoris (BF) muscle tissues were collected from two pig breeds (Huai and Duroc). There were significant differences in meat quality traits and amino acid content. We assessed the muscle transcriptomic profiles using high-throughput RNA sequencing. The IMF content in the LD, PM, and BF muscles of Huai pigs was significantly higher than that in Duroc pigs (p < 0.05). Similarly, the content of flavor amino acids in the three muscle groups was significantly higher in Huai pigs than that in Duroc pigs (p < 0.05). We identified 175, 110, and 86 differentially expressed genes (DEGs) between the LD, PM, and BF muscles of the Huai and Duroc pigs, respectively. The DEGs of the different pig breeds and muscle regions were significantly enriched in the biological processes and signaling pathways related to muscle fiber type, IMF deposition, lipid metabolism, PPAR signaling, cAMP signaling, amino acid metabolism, and ECM-receptor interaction. Our findings might help improve pork yield by using the obtained DEGs for marker-assisted selection and providing a theoretical reference for evaluating and improving pork quality.
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Affiliation(s)
- Xiaojin Li
- College of Animal Science, Anhui Science and Technology University, Chuzhou 233100, China; (X.L.); (L.L.); (X.T.); (R.L.); (E.J.); (M.R.)
- Anhui Province Key Laboratory of Animal Nutritional Regulation and Health, Chuzhou 233100, China
- Key Laboratory of Quality and Safety Control for Pork, Ministry of Agriculture and Rural, No. 9, Chuzhou 233100, China;
| | - Liangyue Lu
- College of Animal Science, Anhui Science and Technology University, Chuzhou 233100, China; (X.L.); (L.L.); (X.T.); (R.L.); (E.J.); (M.R.)
- Anhui Province Key Laboratory of Animal Nutritional Regulation and Health, Chuzhou 233100, China
- Key Laboratory of Quality and Safety Control for Pork, Ministry of Agriculture and Rural, No. 9, Chuzhou 233100, China;
| | - Xinwei Tong
- College of Animal Science, Anhui Science and Technology University, Chuzhou 233100, China; (X.L.); (L.L.); (X.T.); (R.L.); (E.J.); (M.R.)
- Anhui Province Key Laboratory of Animal Nutritional Regulation and Health, Chuzhou 233100, China
- Key Laboratory of Quality and Safety Control for Pork, Ministry of Agriculture and Rural, No. 9, Chuzhou 233100, China;
| | - Ruidong Li
- College of Animal Science, Anhui Science and Technology University, Chuzhou 233100, China; (X.L.); (L.L.); (X.T.); (R.L.); (E.J.); (M.R.)
- Anhui Province Key Laboratory of Animal Nutritional Regulation and Health, Chuzhou 233100, China
- Key Laboratory of Quality and Safety Control for Pork, Ministry of Agriculture and Rural, No. 9, Chuzhou 233100, China;
| | - Erhui Jin
- College of Animal Science, Anhui Science and Technology University, Chuzhou 233100, China; (X.L.); (L.L.); (X.T.); (R.L.); (E.J.); (M.R.)
- Anhui Province Key Laboratory of Animal Nutritional Regulation and Health, Chuzhou 233100, China
- Key Laboratory of Quality and Safety Control for Pork, Ministry of Agriculture and Rural, No. 9, Chuzhou 233100, China;
| | - Man Ren
- College of Animal Science, Anhui Science and Technology University, Chuzhou 233100, China; (X.L.); (L.L.); (X.T.); (R.L.); (E.J.); (M.R.)
- Anhui Province Key Laboratory of Animal Nutritional Regulation and Health, Chuzhou 233100, China
- Key Laboratory of Quality and Safety Control for Pork, Ministry of Agriculture and Rural, No. 9, Chuzhou 233100, China;
| | - Yafei Gao
- Key Laboratory of Quality and Safety Control for Pork, Ministry of Agriculture and Rural, No. 9, Chuzhou 233100, China;
| | - Youfang Gu
- Anhui Province Key Laboratory of Animal Nutritional Regulation and Health, Chuzhou 233100, China
- Key Laboratory of Quality and Safety Control for Pork, Ministry of Agriculture and Rural, No. 9, Chuzhou 233100, China;
| | - Shenghe Li
- College of Animal Science, Anhui Science and Technology University, Chuzhou 233100, China; (X.L.); (L.L.); (X.T.); (R.L.); (E.J.); (M.R.)
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Rasmussen M, Jin JP. Troponin Variants as Markers of Skeletal Muscle Health and Diseases. Front Physiol 2021; 12:747214. [PMID: 34733179 PMCID: PMC8559874 DOI: 10.3389/fphys.2021.747214] [Citation(s) in RCA: 22] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2021] [Accepted: 09/01/2021] [Indexed: 12/21/2022] Open
Abstract
Ca2 +-regulated contractility is a key determinant of the quality of muscles. The sarcomeric myofilament proteins are essential players in the contraction of striated muscles. The troponin complex in the actin thin filaments plays a central role in the Ca2+-regulation of muscle contraction and relaxation. Among the three subunits of troponin, the Ca2+-binding subunit troponin C (TnC) is a member of the calmodulin super family whereas troponin I (TnI, the inhibitory subunit) and troponin T (TnT, the tropomyosin-binding and thin filament anchoring subunit) are striated muscle-specific regulatory proteins. Muscle type-specific isoforms of troponin subunits are expressed in fast and slow twitch fibers and are regulated during development and aging, and in adaptation to exercise or disuse. TnT also evolved with various alternative splice forms as an added capacity of muscle functional diversity. Mutations of troponin subunits cause myopathies. Owing to their physiological and pathological importance, troponin variants can be used as specific markers to define muscle quality. In this focused review, we will explore the use of troponin variants as markers for the fiber contents, developmental and differentiation states, contractile functions, and physiological or pathophysiological adaptations of skeletal muscle. As protein structure defines function, profile of troponin variants illustrates how changes at the myofilament level confer functional qualities at the fiber level. Moreover, understanding of the role of troponin modifications and mutants in determining muscle contractility in age-related decline of muscle function and in myopathies informs an approach to improve human health.
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Affiliation(s)
- Monica Rasmussen
- Department of Physiology, Wayne State University School of Medicine, Detroit, MI, United States
| | - Jian-Ping Jin
- Department of Physiology, Wayne State University School of Medicine, Detroit, MI, United States
- Department of Physiology and Biophysics, University of Illinois at Chicago, Chicago, IL, United States
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Zhu H, Yang H, Zhao W, Su Y, Tian Y. Associations of the expression levels of genes involved in CFL2b and MyHC isoform type changes in longissimus dorsi muscle of HeBao and Large White pigs ( Sus scrofa) during postnatal growth. CANADIAN JOURNAL OF ANIMAL SCIENCE 2019. [DOI: 10.1139/cjas-2016-0058] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
This study aimed to compare the patterns of postnatal transformation of myosin heavy chain (MyHC) isoform types in the longissimus dorsi (LD) muscle between HeBao (HB) and Large White (LW) pigs, and assess the association of porcine cofilin2b (CFL2b) mRNA abundance with changes of myofiber type composition. The four MyHC isoforms (MyHC-1, -2a, -2b, and -2x) of the LD muscle were assessed for mRNA levels in 28 HB and 28 LW pigs by reverse transcription-quantitative polymerase chain reaction (RT-qPCR). The associations of CFL2b mRNA expression and myofiber type (MyHC-1, -2a, -2b, and -2x) changes were analyzed by RT-qPCR. Although the mRNA expression patterns of MyHCs were different between the two breeds, they had similar expression levels. During postnatal growth, relative CFL2b abundance was gradually increased, with dramatic changes observed after 90 d between the two breeds (P < 0.01). Further analysis revealed significant positive correlations of CFL2b gene expression with MyHC-1/slow (HB: r = 0.871), MyHC-2b [LW: r = 0.881 (P < 0.01)], and MyHC-2x (HB: r = 0.795, LW: r = 0.814), and a significant negative correlation with MyHC-1/slow [r = −0.938 (P < 0.01)] in LW. No significant associations of CFL2b expression with MyHC-2a (HB: r = −0. 195, r = −0.697) and MyHC-2b (HB: r = 0.493) were found. Our findings suggested that HB pigs had different muscle development mechanisms in the LD muscle compared with LW, and the CFL2b expression difference could affect the levels of myofiber types which could account for meat quality differences. HB pigs possessed less glycolytic, with more oxidative metabolism and better meat quality traits compared with LW pigs at different growth stages.
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Affiliation(s)
- Hongyan Zhu
- College of Animal Science and Veterinary Medicine, Jinzhou Medical University, Jinzhou 121001, People’s Republic of China
- Key Laboratory of Quality and Safety Engineering of Animal Products of Liaoning Province, Jinzhou 121001, People’s Republic of China
| | - Huixin Yang
- College of Veterinary Medicine, Nanjing Agricultural University, Nanjing 210000, People’s Republic of China
| | - Wei Zhao
- College of Basic Medicine Science, Jinzhou Medical University, Jinzhou 121001, People’s Republic of China
| | - Yuhong Su
- College of Animal Science and Veterinary Medicine, Jinzhou Medical University, Jinzhou 121001, People’s Republic of China
- Key Laboratory of Quality and Safety Engineering of Animal Products of Liaoning Province, Jinzhou 121001, People’s Republic of China
| | - Yumin Tian
- College of Animal Science and Veterinary Medicine, Jinzhou Medical University, Jinzhou 121001, People’s Republic of China
- Key Laboratory of Quality and Safety Engineering of Animal Products of Liaoning Province, Jinzhou 121001, People’s Republic of China
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Shu J, Ji G, Zhang M, Tu Y, Shan Y, Liu Y, Ju X, Zhang D. Molecular Cloning, Characterization, and Temporal Expression Profile of Troponin I Type 1 (TNNI1) Gene in Skeletal Muscle During Early Development of Gaoyou Duck (Anas Platyrhynchos Domestica). Anim Biotechnol 2018; 30:118-128. [DOI: 10.1080/10495398.2018.1444620] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
Affiliation(s)
- Jingting Shu
- Key Laboratory for Poultry Genetics and Breeding of Jiangsu Province, Chinese Academy of Agricultural Science, Institute of Poultry Science, Yangzhou, China
| | - Gaige Ji
- Key Laboratory for Poultry Genetics and Breeding of Jiangsu Province, Chinese Academy of Agricultural Science, Institute of Poultry Science, Yangzhou, China
| | - Ming Zhang
- Key Laboratory for Poultry Genetics and Breeding of Jiangsu Province, Chinese Academy of Agricultural Science, Institute of Poultry Science, Yangzhou, China
| | - Yunjie Tu
- Key Laboratory for Poultry Genetics and Breeding of Jiangsu Province, Chinese Academy of Agricultural Science, Institute of Poultry Science, Yangzhou, China
| | - Yanju Shan
- Key Laboratory for Poultry Genetics and Breeding of Jiangsu Province, Chinese Academy of Agricultural Science, Institute of Poultry Science, Yangzhou, China
| | - Yifan Liu
- Key Laboratory for Poultry Genetics and Breeding of Jiangsu Province, Chinese Academy of Agricultural Science, Institute of Poultry Science, Yangzhou, China
| | - Xiaojun Ju
- Key Laboratory for Poultry Genetics and Breeding of Jiangsu Province, Chinese Academy of Agricultural Science, Institute of Poultry Science, Yangzhou, China
| | - Di Zhang
- Key Laboratory for Poultry Genetics and Breeding of Jiangsu Province, Chinese Academy of Agricultural Science, Institute of Poultry Science, Yangzhou, China
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G. T. Pereira A, Utsunomiya YT, Milanesi M, Torrecilha RBP, Carmo AS, Neves HHR, Carvalheiro R, Ajmone-Marsan P, Sonstegard TS, Sölkner J, Contreras-Castillo CJ, Garcia JF. Pleiotropic Genes Affecting Carcass Traits in Bos indicus (Nellore) Cattle Are Modulators of Growth. PLoS One 2016; 11:e0158165. [PMID: 27410030 PMCID: PMC4943724 DOI: 10.1371/journal.pone.0158165] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2016] [Accepted: 06/10/2016] [Indexed: 12/19/2022] Open
Abstract
Two complementary methods, namely Multi-Trait Meta-Analysis and Versatile Gene-Based Test for Genome-wide Association Studies (VEGAS), were used to identify putative pleiotropic genes affecting carcass traits in Bos indicus (Nellore) cattle. The genotypic data comprised over 777,000 single-nucleotide polymorphism markers scored in 995 bulls, and the phenotypic data included deregressed breeding values (dEBV) for weight measurements at birth, weaning and yearling, as well visual scores taken at weaning and yearling for carcass finishing precocity, conformation and muscling. Both analyses pointed to the pleomorphic adenoma gene 1 (PLAG1) as a major pleiotropic gene. VEGAS analysis revealed 224 additional candidates. From these, 57 participated, together with PLAG1, in a network involved in the modulation of the function and expression of IGF1 (insulin like growth factor 1), IGF2 (insulin like growth factor 2), GH1 (growth hormone 1), IGF1R (insulin like growth factor 1 receptor) and GHR (growth hormone receptor), suggesting that those pleiotropic genes operate as satellite regulators of the growth pathway.
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Affiliation(s)
- Anirene G. T. Pereira
- Departamento de Agroindústria, Alimentos e Nutrição, Escola Superior de Agricultura “Luiz de Queiroz”, USP, Piracicaba, Brazil
- International Atomic Energy Agency (IAEA) Collaborating Centre on Animal Genomics and Bioinformatics, Araçatuba, São Paulo, Brazil
| | - Yuri T. Utsunomiya
- Departamento de Medicina Veterinária Preventiva e Reprodução Animal, UNESP–Univ Estadual Paulista, Faculdade de Ciências Agrárias e Veterinárias, Jaboticabal, São Paulo, Brazil
- International Atomic Energy Agency (IAEA) Collaborating Centre on Animal Genomics and Bioinformatics, Araçatuba, São Paulo, Brazil
| | - Marco Milanesi
- Departamento de Apoio, Produção e Saúde Animal, UNESP—Univ Estadual Paulista, Faculdade de Medicina Veterinária de Araçatuba, Araçatuba, São Paulo, Brazil
- International Atomic Energy Agency (IAEA) Collaborating Centre on Animal Genomics and Bioinformatics, Araçatuba, São Paulo, Brazil
| | - Rafaela B. P. Torrecilha
- Departamento de Medicina Veterinária Preventiva e Reprodução Animal, UNESP–Univ Estadual Paulista, Faculdade de Ciências Agrárias e Veterinárias, Jaboticabal, São Paulo, Brazil
- International Atomic Energy Agency (IAEA) Collaborating Centre on Animal Genomics and Bioinformatics, Araçatuba, São Paulo, Brazil
| | - Adriana S. Carmo
- Departamento de Medicina Veterinária Preventiva e Reprodução Animal, UNESP–Univ Estadual Paulista, Faculdade de Ciências Agrárias e Veterinárias, Jaboticabal, São Paulo, Brazil
- International Atomic Energy Agency (IAEA) Collaborating Centre on Animal Genomics and Bioinformatics, Araçatuba, São Paulo, Brazil
| | | | - Roberto Carvalheiro
- Departamento de Zootecnia, UNESP—Univ. Estadual Paulista, Faculdade de Ciências Agrárias e Veterinárias, Jaboticabal, São Paulo, Brazil
| | | | | | - Johann Sölkner
- BOKU—University of Natural Resources and Life Sciences, Department of Sustainable Agricultural Systems, Division of Livestock Sciences, Vienna, Austria
| | - Carmen J. Contreras-Castillo
- Departamento de Agroindústria, Alimentos e Nutrição, Escola Superior de Agricultura “Luiz de Queiroz”, USP, Piracicaba, Brazil
| | - José F. Garcia
- Departamento de Medicina Veterinária Preventiva e Reprodução Animal, UNESP–Univ Estadual Paulista, Faculdade de Ciências Agrárias e Veterinárias, Jaboticabal, São Paulo, Brazil
- Departamento de Apoio, Produção e Saúde Animal, UNESP—Univ Estadual Paulista, Faculdade de Medicina Veterinária de Araçatuba, Araçatuba, São Paulo, Brazil
- International Atomic Energy Agency (IAEA) Collaborating Centre on Animal Genomics and Bioinformatics, Araçatuba, São Paulo, Brazil
- * E-mail:
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Three slow skeletal muscle troponin genes in small-tailed Han sheep (Ovis aries): molecular cloning, characterization and expression analysis. Mol Biol Rep 2016; 43:999-1010. [DOI: 10.1007/s11033-016-4027-6] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2016] [Accepted: 06/07/2016] [Indexed: 10/21/2022]
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Katsumata M, Yamaguchi T, Ishida A, Ashihara A. Changes in muscle fiber type and expression of mRNA of myosin heavy chain isoforms in porcine muscle during pre- and postnatal development. Anim Sci J 2016; 88:364-371. [PMID: 27230088 DOI: 10.1111/asj.12641] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2015] [Revised: 02/04/2016] [Accepted: 03/08/2016] [Indexed: 11/30/2022]
Abstract
The purpose of this study is to elucidate developmental changes in muscle fiber type in the pig during pre- and postnatal development. For this purpose, we performed a histochemical analysis for myosin adenosine triphosphatase activity to assess muscle fiber type and determined abundances of messenger RNA (mRNA) of myosin heavy chain (MHC) isoforms. Samples of Longissimus dorsi (LD) muscle were taken from fetuses on day 90 of the fetal stage. Further, samples of LD, Rhomboideus and Biceps femoris (B. femoris) muscles were taken from pigs when they were 1, 12, 26, 45 or 75 days old. Expression of MHC 2b mRNA in the LD and the B. femoris muscles rapidly and considerably increased from the late fetal stage to the early postnatal stage and this increase was associated with the development of type 2b fibers at least in the LD muscle. As shown by the rapid and considerable changes in expression of MHC 2b mRNA, it seems that a certain plasticity of muscle fiber type still remains in this developmental stage.
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Affiliation(s)
- Masaya Katsumata
- Animal Physiology and Nutrition Research Division, NARO Institute of Livestock and Grassland Science, Tsukuba, Ibaraki, Japan.,School of Veterinary Medicine, Azabu University, Sagamihara, Kanagawa, Japan
| | - Tomomi Yamaguchi
- Animal Physiology and Nutrition Research Division, NARO Institute of Livestock and Grassland Science, Tsukuba, Ibaraki, Japan.,Tokushima Prefectural Seibu Livestock Hygiene Center, Miyoshi, Tokushima, Japan
| | - Aiko Ishida
- Animal Physiology and Nutrition Research Division, NARO Institute of Livestock and Grassland Science, Tsukuba, Ibaraki, Japan
| | - Akane Ashihara
- Animal Physiology and Nutrition Research Division, NARO Institute of Livestock and Grassland Science, Tsukuba, Ibaraki, Japan
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