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Transcriptional Regulatory Region And Dna M.ethylation Analysis Of Tnni1 G ene Promoters In Gaoyou Duck Skeletal Muscle (Anas Platyrhynchos Domestica)

文献类型： 外文期刊

作者： Ju, X. -J.;Zhang, M.;Ji, G. -G.;Shan, Y. -J.;Liu, Y. -F.;Tu, Y. -J.;Shu, J. -T.

作者机构：

关键词： DNA methylation; Gaoyou duck; promoter; skeletal muscle; TNNI1 gene

期刊名称： BRITISH POULTRY SCIENCE

ISSN： 0007-1668

年卷期： 2019 年 60 卷 3 期

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摘要： 1. The slow skeletal muscle troponin I (TNNI1) gene has been found to be specifically expressed in slow muscle fibres and plays an important role in muscle development. The aim of this study was to determine the active control area of duck TNNI1 and identify the potential cis-regulatory elements in the promoter. 2. In this study, the TNNI1 promoter was first cloned by genome walking and the sequences were analysed using bioinformatics software. Firefly luciferase reporter gene vectors, driven by a series of constructs with progressive deletions, were used to identify the core transcriptional regulatory region of the duck TNNI1 gene. The methylation status of the CpG island in the TNNI1 promoter was detected in skeletal muscle on embryonic days 21 and 27, by bisulphite sequencing PCR (BSP). 3. The results showed two CpG islands presented in the promoter region, with one of the CpG islands located in the core transcriptional regulatory region (-2078/-885 bp). The total methylation levels of the 14 CpG sites were not altered between breast and leg muscles on embryonic days 21 and 27. However, four CpG sites (loci of positions 4, 11, 13, and 14) showed dramatically different methylation levels between breast and leg muscles at embryonic days 21 and 27. Analysis showed that multiple CpG sites had a significant correlation between the methylation levels of the CpG sites and mRNA expressions in skeletal muscle. Multiple transcription factor binding sites including Sp1, c-Myc, Oct-1 and NF-kB motifs were identified and might be responsible for transcriptional regulation of the TNNI1 gene. 4. These findings contribute to further understanding of the fundamental mechanism for transcriptional regulation of the TNNI1 gene in ducks.

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