高通量测序法研究不同pH的饮用水对SPF小鼠肠道微生物的影响

目的研究不同pH饮用水对SPF小鼠肠道微生物多样性的影响。方法 21日龄SPF小鼠90只随机分成3组,每组30只,分别给予三类水,即酸化水(pH 3.0),中性水(pH 7.0)和碱性水(pH 9.0),并进行为期三个月的饲养。每组分别在饲养4周、8周、12周末各处死10只动物,取血清按SPF国标项目检测了细菌、病毒、寄生虫,取回盲部内容物,根据细菌16S rRNA的保守性设计引物,构建文库,进行高通量(Illumina)测序,获得10 G的数据,并对数据进行统计,聚类分析。结果以pH 3.0处理的小鼠肠道微生物丰富度适中,稳定性高。结论在规模化饲养条件下,选取pH 3.0饮用水小鼠能较长时间维持肠道微生物多样性,稳定性达到一个平台。本研究为长期稳定维持动物质量的生产实践提供了理论与技术支持,也是胃肠道宏基因组学技术在动物质量控制领域的一个具体应用。

Effect of drinking water at different pH on intestinal microbial diversity in SPF mice evaluated by high throughput sequencing

Objective To study the effect of drinking water at different pH on intestinal microbial diversity in SPF mice. Methods Ninety 21-day-old SPF mice were randomly divided into three groups:drinking acidified water (pH 3.0), neutral water (pH 7.0) and alkaline water (pH 9.0), respectively, for 3 months, 30 mice in each group. 10 mice were sacrificed at the end of 4, 8 and 12 weeks in each group. Bacteria, virus and parasites in serum were detected according to the national standard for SPF. Then, primer sequences were designed according to the conservativeness of bacteria 16S rRNA, and libraries were constructed. Subsequently, the ileocecal contents were subjected to high-throughput sequencing (Illumina). 10 G data were obtained and analyzed. Results The sequencing results revealed that the intestinal microbial abundance of the mice receiving pH 3.0 drinking water was moderate with a high stability. Conclusions Under the conditions of large-scale breeding, the mice receiving pH 3.0 drinking water can maintain the intestinal microbial diversity for a long time, and reach a stable platform. This study provides theoretical and technical support for the stable long-term maintenance of animal quality production. It is also a specific application of gastrointestinal macrogenomics in animal quality control.