Scientia Agricultura Sinica ›› 2019, Vol. 52 ›› Issue (10): 1818-1829.doi: 10.3864/j.issn.0578-1752.2019.10.014

• ANIMAL SCIENCE·VETERINARY SCIENCE·RESOURCE INSECT • Previous Articles     Next Articles

Silencing and Overexpressing SMAD Family Member 1 (SMAD1) Gene and Its Effect on Myogenesis in Primary Myoblast of Qinchuan Cattle (Bos taurus)

NING Yue1,MI Xue1,CHEN XingYi1,SHAO JianHang1,ZAN LinSen1,2()   

  1. 1 College of Animal Science and Technology, Northwest A&F University, Yangling 712100, Shaanxi;
    2 National Beef Cattle Improvement Center, Yangling 712100, Shaanxi
  • Received:2018-12-06 Accepted:2019-02-26 Online:2019-05-16 Published:2019-05-23
  • Contact: LinSen ZAN E-mail:zanlinsen@163.com

Abstract:

【Objective】The aims of the present study were to investigate molecular function of SMAD1 gene in the bovine myoblast cell differentiation and to explore its role in the growth and development of Qinchuan cattle for beef production.【Method】SMAD1 gene was silenced and overexpressed through RNA interference and adenovirus recombinant over expression vector containing SMAD1. The negative control siRNA-NC and RNA interference specific targeted SMAD1 gene (siSMAD1) were designed and synthesized against the bovine SMAD1 mRNA sequence (CDS), which was obtained by RT-PCR using cDNA of Qinchuan cattle myoblast as template, and then, which was inserted into a shuttle vector pDC316-mCMV-EGFP to construct the over expression of adenovirus shuttle vector pDC316-mCMV-EGFP-bSMAD1. Adenovirus genome plasmid and adenovirus shuttle vectors were cotransfected into HEK293 cell line to pack and obtain recombinant adenovirus. Adenovirus containing target gene was named as AD-bSMAD1, while pDC316-EGFP was used as a reference vector and was considered as control group "AD-NC". Their titers were tested by using LaSRT method. Bovine myoblast were transfected with siSMAD1 and AD-bSMAD1, the mRNA level of SMAD1 gene and myogenesis-related genes, such as MyoD, Myf5 and MyoG, were detected by real-time quantitative PCR, and the impact on myotube formation was observed. 【Result】 The mRNA level of SMAD1 gene transfected with siRNA was reduced 75.4% (induced differentiation for 1 day, P<0.01), 66.7% (induced differentiation for 3 days, P<0.01), 60.0% (induced differentiation for 6 days, P<0.01), 54.7% (induced differentiation for 9 days, P<0.01), respectively, compared with the siRNA-NC. The optimum titer of AD-bSMAD1 infectious was found at 1×10 10pfu/mL. The expression levels of SMAD1 were rapidly increased 2.10 (induced differentiation for 1 day), 3.19 (induced differentiation for 3 days), 105.3 (induced differentiation for 6 days, P<0.01) and 144 (induced differentiation for 9 days, P<0.01) times of the control group after infected by AD-bSMAD1, respectively. In addition, both myotube formation and qRT-PCR results proved that SMAD1 gene promoted myoblasts differentiation and myotube formation, as well as the mRNA expression level of MyoD, Myf5, and MyoG. 【Conclusion】 We could conclude from the present study that SMAD1 gene performed its function in the myoblast differentiation and myotube formation. Based upon these findings, SMAD1 gene could be used as potential marker for the breed improvement of Qinchuan cattle through marker assisted selection for beef production.

Key words: mothers against decapentaplegic homolog 1 gene (SMAD1), siRNA, adenovirus vector, primary myoblast, myotube formation, Qinchuan cattle

Table 1

Amino acid sequence of SMAD1 among nine species"

物种 Species 登录号 Accession 物种 Species 登录号 Accession
Bos Taurus NP_001069691.2 Sus scrofa NP_999130.1
Capra hircus XP_017917067.1 小鼠 Mus musculus NP_032565.2
绵羊 Ovis aries XP_014956993.1 大鼠 Rattus norvegicu NP_037262.2
Homo sapiens NP_005891.1 Gallus gallus NP_001188384.1
Canis lupus XP_022259170.1

Table 2

Sequences of siRNA"

序列名称
Sequence name
序列 (5'→3')
Sequences (5'→3')
siSMAD1 sense:5'-CCAUCUCUGCCUUCAGAAATT-3'
antisense:5'-UUUCUGAAGGCAGAGAUGGTT-3'
siRNA-NC sense:5'-UUCUCCGAACGUGUCACGUTT-3'
antisense:5'-ACGUGACACGUUCGGAGAATT-3'

Table 3

PCR Primers"

基因名称 Gene name 登录号 Accession No. 引物序列 (5'→3') Primer sequences (5'→3') 产物 Size(bp)
CDS-SMAD1 NM_001077107.2 F:CTAGCTAGCCACCATGAATGTGACAAGTTTATTTTCCTTCAC 1452
R:ATTTGCGGCCGCCTACAGATCCTCTTCTGAGATGAGTTTTTGTTCC
RT-SMAD1 NM_001077107.2 F:TTCGCATGAGCTTTGTGAAG 98
R:GTGAGCCCATCTGGGTAAGA
RT-MyoD NM_001040478 F:TCCGCGACGTAGACTTGA 84
R:CGAAACACGGGTCATCATAGAA
RT-MyoG NM_001111325 F:GGCGTGTAAGGTGTGTAAG 85
R:CTTCTTGAGTCTGCGCTTCT
RT-Myf5 NM_174116.1 F:CCTCTAGTTCCAGGCTCATCTA 90
R:ACCTCCTTCCTCCTGTGTAATA
RT-GAPDH NM_001034034 F: CCAACGTGTCTGTTGTGGAT 80
R: CTGCTTCACCACCTTCTTGA

Table 4

Concentration gradient of adenovirus"

稀释倍数
Diluted multiples
上一梯度病毒液
Virus of upper gradient
DMEM完培
DMEM complete medium
上样量
Volume of the sample
滴定量
Volume of the virus
103 10 90 10 1μL
104 10 90 10 0.1μL
105 10 90 10 0.01μL
106 10 90 10 0.001μL
107 10 90 10 0.0001μL

Fig. 1

Multi-sequences comparison of SMAD1 amino acids (differences in part) The amino acid sites with 100% consistency are marked with white background, and 0% consistency sites are marked with black background. The specific conservatism is shown in the line diagram below"

Fig. 2

Detection of interference efficiency of siSMAD1"

Fig. 3

Construction of the adenovirus vector pDC316-mCMV-EGFP-bSMAD1 A: PCR products of SMAD1 gene CDS region in Qinchuan cattle; B: Identification of recombinant plasmid pDC316-mCMV-EGFP-bSMAD1 by double digestion of NheI and NotI. M1: DL2000 DNA marker; M2: Trans2K plus marker; lane1 and 2: PCR products of SMAD1 gene in two kinds of myoblasts; lane 3: Identification of pDC316-mCMV-EGFP-bSMAD1 by double digestion of NheI and NotI"

Fig. 4

Adenovirus packaging and amplification A: GFP Expression of 293 cells infected after 24 h; B: Green fluorescence showed a grapes-like gathering and adenovirus started to appear after 9 d; C: After 14d-infection of AD-bSMAD1 and 12d-infection of AD-NC, most cells became shrinkage, roundout and shedding, gathered as the first-generation adenovirus; D: GFP expression of 293 cells after 48h-infection of high titers adenovirus (P3). Original magnification: 40× (OLYMPUS IX71, scale bars: 200 μm)"

Fig. 5

Detection of overexpression efficiency of AD-bSMAD1"

Fig. 6

Regulation of bovine primary myoblasts differentiation by silencing and overexpressing SMAD1 gene A: Cell micrographs of bovine primary myoblasts after 6 days induction transfected with siSMAD1; B: Cell micrographs of bovine primary myoblasts after 6 days induction infected with AD-bSMAD1; C: Relative mRNA expression of MyoD, Myf5 and MyoG after silencing SMAD1 gene; D: Relative mRNA expression of MyoD, Myf5 and MyoG after overexpression of SMAD1 gene. Original magnification: 40× (OLYMPUS IX71, scale bars: 200 μm)"

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