title: Identification of miRNA from Porphyra yezoensis by high-throughput sequencing and bioinformatics analysis.
abstract: BACKGROUND
  miRNAs are a class of non-coding, small RNAs that are approximately 22 nucleotides long and play important roles in the translational level regulation of gene expression by either directly binding or cleaving target mRNAs. The red alga, Porphyra yezoensis is one of the most important marine economic crops worldwide. To date, only a few miRNAs have been identified in green unicellar alga and there is no report about Porphyra miRNAs.
  
  
  RESULTS
  To identify miRNAs in Porphyra yezoensis, a small RNA library was constructed. Solexa technology was used to perform high throughput sequencing of the library and subsequent bioinformatics analysis to identify novel miRNAs. Specifically, 180,557,942 reads produced 13,324 unique miRNAs representing 224 conserved miRNA families that have been identified in other plants species. In addition, seven novel putative miRNAs were predicted from a limited number of ESTs. The potential targets of these putative miRNAs were also predicted based on sequence homology search.
  
  
  CONCLUSIONS
  This study provides a first large scale cloning and characterization of Porphyra miRNAs and their potential targets. These miRNAs belong to 224 conserved miRNA families and 7 miRNAs are novel in Porphyra. These miRNAs add to the growing database of new miRNA and lay the foundation for further understanding of miRNA function in the regulation of Porphyra yezoensis development.
authors.affiliation: Qingdao University of Technology and Science, Qingdao, China.
authors.forename: Chengwei
authors.initials: C
authors.lastname: Liang
authors.forename: Xiaowen
authors.initials: X
authors.lastname: Zhang
authors.forename: Jian
authors.initials: J
authors.lastname: Zou
authors.forename: Dong
authors.initials: D
authors.lastname: Xu
authors.forename: Feng
authors.initials: F
authors.lastname: Su
authors.forename: Naihao
authors.initials: N
authors.lastname: Ye
mesh_terms: D019295:Computational Biology / Q000379:methods*; D017124:Conserved Sequence; D019143:Evolution, Molecular; D057166:High-Throughput Screening Assays / Q000379:methods*; D035683:MicroRNAs / Q000235:genetics* / Q000378:metabolism; D044664:Porphyra / Q000235:genetics*; D017423:Sequence Analysis, RNA / Q000379:methods*; D013045:Species Specificity
chemical_list: D035683:MicroRNAs