生物技术
生物技术

微生物
系统生物学
细胞生物学
应用前景:随着生物技术水平的不断发展,基因组、蛋白组等上游组学在微生物领域的研究逐渐成熟,如何延伸研究成果,突破研究瓶颈?如何更系统性描述生物体研究现象,使研究成果向具体实践转化?代谢组学的应用需求将逐渐增加。
沙门氏菌的多细胞发展改变全局代谢表型
研究背景
研究目的
实验设计
研究结果
1通过多元统计学分析找到25个显著差异代谢物。大部分在野生型中含量更高的差异代谢物包括葡萄糖及其形成的多聚体、糖原、半乳糖,甘露糖,和甘油-3-磷酸等都是糖异生的终产物;2在csgD缺失突变菌株中含量变高的代谢物有琥珀酸盐、富马酸盐、苹果酸盐、聚胺化合物腐胺、尸胺、腺苷一磷酸(AMP)、腺嘌呤和脯氨酸;3将这些显著差异代谢物放入代谢通路分析显示糖异生路径在野生型中被激活,或是在csgD缺失的菌株中受到了抑制;4在csgD缺失菌株中存在糖异生路径中受到阻碍,致使TCA循环中产物及多胺物质产生蓄积。这也从AMP在csgD缺失菌株内含量的升高得到了代谢水平上的数据支持;
5在基因表达水平上,共监控59个单基因或多基因的表达情况,涵盖了从代谢组学数据中了解的所有可能变化通路;6转录分析表明,在野生型细胞聚集的同时伴随着大量相关基因的激活,而在csgD缺失菌株中就没有观察到这种现象;7在监控包括琥珀酸脱氢酶(sdhCD),延胡索酸还原酶(fumAC)和苹果酸脱氢酶(MDH)在内的TCA上游通路相关基因表达时发现,野生型菌株在聚集的过程中这些基因都有明显上调,而在csgD缺失菌株内表达下降提示TCA循环中间产物的升高不是由于相关酶上调所造成的,而更可能是由于糖异生受到了抑制所造成的。
代谢组学作为一种新型分析方法,能够帮助研究者们从代谢层面解释生物现象,并能够通过多组学交叉验证帮助验证上游组学结果,使研究结果更具有可信度,得到更丰富的生物学信息。原文索引:
A Global Metabolic Shift is Linked to Salmonella Multicelluar Development, Plos One, 2010, 5(7):1-12

生物技术领域2015年发表的文献
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