Whole Genomic DNA Sequencing and Comparative Genomic Analysis of Arthrospira Platensis: High Genome Plasticity and Genetic Diversity

Overview

Journal DNA Res

Publisher Oxford University Press

Specialties Genetics
Molecular Biology

Date 2016 Jun 23

PMID 27330141

Citations 14

Authors

Teng Xu

Song Qin

Yongwu Hu

Zhijian Song

Jianchao Ying

Peizhen Li

Wei Dong

Fangqing Zhao

Huanming Yang

Qiyu Bao

Affiliations

Soon will be listed here.

Abstract

Arthrospira platensis is a multi-cellular and filamentous non-N2-fixing cyanobacterium that is capable of performing oxygenic photosynthesis. In this study, we determined the nearly complete genome sequence of A. platensis YZ. A. platensis YZ genome is a single, circular chromosome of 6.62 Mb in size. Phylogenetic and comparative genomic analyses revealed that A. platensis YZ was more closely related to A. platensis NIES-39 than Arthrospira sp. PCC 8005 and A. platensis C1. Broad gene gains were identified between A. platensis YZ and three other Arthrospira speices, some of which have been previously demonstrated that can be laterally transferred among different species, such as restriction-modification systems-coding genes. Moreover, unprecedented extensive chromosomal rearrangements among different strains were observed. The chromosomal rearrangements, particularly the chromosomal inversions, were analysed and estimated to be closely related to palindromes that involved long inverted repeat sequences and the extensively distributed type IIR restriction enzyme in the Arthrospira genome. In addition, species from genus Arthrospira unanimously contained the highest rate of repetitive sequence compared with the other species of order Oscillatoriales, suggested that sequence duplication significantly contributed to Arthrospira genome phylogeny. These results provided in-depth views into the genomic phylogeny and structural variation of A. platensis, as well as provide a valuable resource for functional genomics studies.

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