結(jié)核分枝桿菌基因組重注釋研究
[Abstract]:Tuberculosis causes serious harm to the health of people all over the world every year. Among them, Mycobacterium tuberculosis (Mycobacterium tuberculosis) is the pathogen of tuberculosis. Although much progress has been made in the study of the genomics of Mycobacterium tuberculosis, the annotated information on the entire genome of Mycobacterium tuberculosis is available in the genome public database, but over time, More and more new genetic functional information has been added to the database, which may contain sequence-like genes that were not used in the initial annotation of Mycobacterium tuberculosis. In genome analysis, these new gene function information may provide a functional transfer source for some hypothetical genes. At the same time, some genes not contained in the original annotation may be found by comparing with the newly added gene function information. In order to solve the above problems, we will reannotate the genome information of Mycobacterium tuberculosis by means of gene similarity comparison and new gene discovery based on ab initio prediction. The method of this study can be used as a reference for genome reannotation of other species. The main contents of this study are: 1: 1. Based on the Z curve theory, a protein encoding gene (the first type gene) with known function is selected from the original gene annotation as a positive sample, and a negative sample is generated by random shuffling sequence of the first type gene. Taking positive and negative samples as training set, the non-coding part of hypothetical gene (second type gene) is determined by Fisher model based on quintuple cross validation, that is, the wrong annotated gene. 2 in the original annotation. Prodigal and Zcurve were used to predict the genome of Mycobacterium tuberculosis. The results of gene prediction were compared with the original genome annotation, and the candidate genes with low overlap rate were selected for Blast sequence alignment. The new genes that meet the conditions were selected by using the selected screening parameters, and specific functional annotation information was added to the new genes. In the process of gene reannotation, it is necessary for researchers to carry out manual screening. When there are a large number of genomes that need to be re-annotated, especially when new genes are selected from Blast results to meet the requirements, it will be a very heavy task. Therefore, this study also developed a set of Web tools which can automatically reannotate genome by using PHP, which can reduce the manual screening workload and improve the efficiency of gene reannotation greatly.
【學(xué)位授予單位】:電子科技大學(xué)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2014
【分類號(hào)】:R378.911
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