In silico analysis of the potential infection mechanisms of Magnaporthe grisea from horizontal gene transfer hypothesis.

Genomics, Proteomics & Bioinformatics
Chunyang LiJinku Bao

Abstract

Horizontal gene transfer (HGT) has long been considered as a principal force for an organism to gain novel genes in genome evolution. Homology search, phylogenetic analysis and nucleotide composition analysis are three major objective approaches to arguably determine the occurrence and directionality of HGT. Here, 21 genes that possess the potential to horizontal transfer were acquired from the whole genome of Magnaporthe grisea according to annotation, among which three candidate genes (corresponding protein accession numbers are EAA55123, EAA47200 and EAA52136) were selected for further analysis. According to BLAST homology results, we subsequently conducted phylogenetic analysis of the three candidate HGT genes. Moreover, nucleotide composition analysis was conducted to further validate these HGTs. In addition, the functions of the three candidate genes were searched in COG database. Consequently, we conclude that the gene encoding protein EAA55123 is transferred from Clostridium perfringens. Another HGT event is between EAA52136 and a certain metazoan's corresponding gene, but the direction remains uncertain. Yet, EAA47200 is not a transferred gene.

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Datasets Mentioned

BETA
EAA47200
EAA52136
EAA48384
AAC98456

Software Mentioned

UPGMA
ClustalW
BLAST
Molecular Evolutionary Genetics Analysis ( MEGA )
CodonW
Genetics Computer Group ( GCG )

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