Journal of Tianjin Agricultural University ›› 2022, Vol. 29 ›› Issue (3): 29-35.doi: 10.19640/j.cnki.jtau.2022.03.006

• Researches and Scientific Notes • Previous Articles     Next Articles

Effects of different DNA extraction methods on structural analysis of intestinal microbiota from Cynoglossus semilaevis based on high-throughput sequencing

Ge Lunhua, Jiang Boyun, Sun JingfengCorresponding Author, Lü Aijun, Hu Xiucai, Chen Limei   

  1. College of Fisheries, Tianjin Agricultural University, Tianjin 300392, China
  • Received:2020-07-24 Online:2022-09-30 Published:2022-10-10

Abstract: The purpose of this study was to analyze the effects of different DNA extraction methods on structural analysis of intestinal microbiota from C. semilaevis based on high throughput sequencing and comprehensively learn about the structural characteristics of its intestinal flora. In this study, three DNA extraction methods including combination of lysozyme and ultrasonic lysis(CLU), Zirmil-beating cell disruption(ZBC)and QIA commercial kits were used to extract the genomic DNA of intestinal microflora from healthy C. semilaevis. The DNA samples were sequenced on an Illumina MiSeq high-throughput sequencing platform, and the structural characteristics and diversities of the intestinal microflora were analyzed. The results showed that a total of 7 516 OTUs were obtained across all samples extracted by the three DNA extraction methods. The identified dominant bacterial taxa were similar among these samples. At Phylum level, the dominant bacterial taxa included Proteobacteria, Firmicutes, Spirochaetae and Bacteroides. Through Alpha diversity index analysis, the corresponding Chao1 indexes of CLU, ZBC and QIA methods were 5 668, 5 868 and 4 090 respectively, and the Simpson index were 0.021, 0.022 and 0.018 respectively. The Chao1 and Simpson indexes of QIA methods were all lower than those of other methods. Beta diversity analysis based on the UniFrac distance matrix showed that the microbial community structure and species richness were more similar between the CLU and QIA samples. These results indicated that these three different DNA extraction methods reached the similar results in the major dominant intestinal microflora, based on the investigation using high-throughput sequencing analysis. However, biases occurred in the identification results of some less abundant intestinal microflora. The results providereference for research methods of the diversity and structure of fish intestinal microflora, especially the DNA extraction strategy, and contribute to comprehensively expounding the structural characteristics of intestinal microflora of C. semilaevis.

Key words: high-throughput sequencing, DNA extraction method, C. semilaevis, intestinal microflora, composition structure

CLC Number: