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Original Research ARTICLE Provisionally accepted The full-text will be published soon. Notify me

Front. Genet. | doi: 10.3389/fgene.2019.00378

Evolution of complex thallus alga: genome sequencing of Saccharina japonica

 Tao Liu1, 2,  Xumin Wang3,  Guoliang Wang4, 5,  Shangang Jia3*, Guiming Liu6, Guangle Shan7, Chan Chi1, 8, Jing Zhang9,  Yahui Yu1, Ting Xue10 and Jun Yu7
  • 1College of Marines Life Science, Ocean University of China, China
  • 2Hainan Academy of Ocean and Fisheries Sciences, China
  • 3College of Life Sciences, Yantai University, China
  • 4Key Laboratory of Genome Sciences & Information, Beijing Institute of Genomics (CAS), China
  • 5University of Chinese Academy of Sciences (UCAS), China
  • 6Beijing Agricultural Biotechnology Research Center, China
  • 7Key Laboratory of Genome Sciences & Information, Beijing Institute of Genomics (CAS), China
  • 8Qingdao Haida Blue Tek Biotechnology Co., Ltd, China
  • 9Qilu University of Technology, China
  • 10College of Life Sciences, Fujian Normal University, China

Saccharina, as one of the most important brown algae (Phaeophyceae) with multicellular thallus, has a very remarkable evolutionary history, and globally account for most of economic marine aquaculture production worldwide. Here we present the 580.5 million base pair of genome sequence of Saccharina japonica, whose current assembly contains 35,725 protein-coding genes. In a comparative analysis with Ectocarpus silicilosus, the integrated virus sequence suggested the genome evolutionary footprints, which derived from their co-ancestry and experienced genomic arrangements. Furthermore, the gene expansion was found as the important strategy for functional evolution, especially ones related to extracelluar components, stress-related genes, and vanadium-dependent haloperoxidases, and we proposed a hypothesis that gene duplication events were the main driven force for the evolution history from multicellular filamentous algae to thallus algae. The sequenced Saccharina genome paves the way for further molecular studies and is useful for genome-assisted breeding of S. japonica and other related algae species.

Keywords: Saccharina japonica, Genome sequencing, Virus genome, phylogenetic analysis, extracellular components, halogen biosynthesis

Received: 12 Dec 2018; Accepted: 09 Apr 2019.

Edited by:

Gen Hua YUE, Temasek Life Sciences Laboratory, Singapore

Reviewed by:

Jian Xu, Chinese Academy of Fishery Sciences (CAFS), China
Chaotian Xie, Jimei University, China  

Copyright: © 2019 Liu, Wang, Wang, Jia, Liu, Shan, Chi, Zhang, Yu, Xue and Yu. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

* Correspondence: Dr. Shangang Jia, College of Life Sciences, Yantai University, Yantai, China, jsg200830@163.com