title: Identification and characterization of microRNAs from Chinese pollination constant non-astringent persimmon using high-throughput sequencing.
abstract: BACKGROUND
  microRNAs (miRNAs) have been shown to play key roles in regulating gene expression at post-transcriptional level, but miRNAs associated with natural deastringency of Chinese pollination-constant nonastringent persimmon (CPCNA) have never been identified.
  
  
  RESULTS
  In this study, two small RNA libraries established using 'Eshi No. 1' persimmon (Diospyros kaki Thunb.; CPCNA) fruits collected at 15 and 20 weeks after flowering (WAF) were sequenced through Solexa platform in order to identify miRNAs involved in deastringency of persimmon. A total of 6,258,487 and 7,634,169 reads were generated for the libraries at 15 and 20 WAF, respectively. Based on sequence similarity and hairpin structure prediction, 236 known miRNAs belonging to 65 miRNA families and 33 novel miRNAs were identified using persimmon transcriptome data. Sixty one of the characterized miRNAs exhibited pronounced difference in the expression levels between 15 and 20 WAF, 17 up-regulated and 44 down-regulated. Expression profiles of 12 conserved and 10 novel miRNAs were validated by stem loop qRT-PCR. A total of 198 target genes were predicted for the differentially expressed miRNAs, including several genes that have been reported to be implicated in proanthocyanidins (PAs, or called tannin) accumulation. In addition, two transcription factors, a GRF and a bHLH, were experimentally confirmed as the targets of dka-miR396 and dka-miR395, respectively.
  
  
  CONCLUSIONS
  Taken together, the present data unraveled several important miRNAs in persimmon. Among them, miR395p-3p and miR858b may regulate bHLH and MYB, respectively, which are influenced by SPL under the control of miR156j-5p and in turn regulate the structural genes involved in PA biosynthesis. In addition, dka-miR396g and miR2911a may regulate their target genes associated with glucosylation and insolubilization of tannin precursors. All of these miRNAs might play key roles in the regulation of (de)astringency in persimmon fruits under normal development conditions.
authors.affiliation: Key Laboratory of Horticultural Plant Biology (MOE), College of Horticulture and Forestry Science, Huazhong Agricultural University, Wuhan, 430070, China. luoyujie200701@163.com.
authors.forename: Yujie
authors.initials: Y
authors.lastname: Luo
authors.affiliation: Key Laboratory of Horticultural Plant Biology (MOE), College of Horticulture and Forestry Science, Huazhong Agricultural University, Wuhan, 430070, China. xiaona0379@163.com.
authors.forename: Xiaona
authors.initials: X
authors.lastname: Zhang
authors.affiliation: Key Laboratory of Horticultural Plant Biology (MOE), College of Horticulture and Forestry Science, Huazhong Agricultural University, Wuhan, 430070, China. luozhr@mail.hzau.edu.cn.
authors.forename: Zhengrong
authors.initials: Z
authors.lastname: Luo
authors.affiliation: Key Laboratory of Horticultural Plant Biology (MOE), College of Horticulture and Forestry Science, Huazhong Agricultural University, Wuhan, 430070, China. zhangqinglin@mail.hzau.edu.cn.
authors.forename: Qinglin
authors.initials: Q
authors.lastname: Zhang
authors.affiliation: Key Laboratory of Horticultural Plant Biology (MOE), College of Horticulture and Forestry Science, Huazhong Agricultural University, Wuhan, 430070, China. liujihong@mail.hzau.edu.cn.
authors.forename: Jihong
authors.initials: J
authors.lastname: Liu
mesh_terms: D001483:Base Sequence; D029788:Diospyros / Q000235:genetics* / Q000254:growth & development; D035264:Flowers / Q000235:genetics; D005638:Fruit / Q000235:genetics; D020869:Gene Expression Profiling; D018507:Gene Expression Regulation, Developmental; D018506:Gene Expression Regulation, Plant; D015723:Gene Library; D063990:Gene Ontology; D059014:High-Throughput Nucleotide Sequencing / Q000379:methods*; D035683:MicroRNAs / Q000737:chemistry / Q000235:genetics* / Q000378:metabolism; D058977:Molecular Sequence Annotation; D008969:Molecular Sequence Data; D009690:Nucleic Acid Conformation; D054817:Pollination / Q000235:genetics*; D044945:Proanthocyanidins / Q000378:metabolism; D018749:RNA, Plant / Q000235:genetics / Q000378:metabolism; D060888:Real-Time Polymerase Chain Reaction; D015203:Reproducibility of Results; D013997:Time Factors
chemical_list: D035683:MicroRNAs; D044945:Proanthocyanidins; D018749:RNA, Plant