Systematic identification and characterization of porcine snoRNAs: structural, functional and developmental insights

文献类型： 外文期刊

第一作者： Liu, Nan

作者： Liu, Nan;Xiao, Bang;Ren, Hong-Yan;Tang, Zhong-Lin;Li, Kui

作者机构：

关键词： characterization;expression pattern;identification;pig;snoRNA

期刊名称：ANIMAL GENETICS （ 影响因子：3.169； 五年影响因子：3.058 ）

ISSN： 0268-9146

年卷期： 2013 年 44 卷 1 期

页码：

收录情况： SCI

摘要： Small nucleolar RNAs (snoRNAs) are 50- to 300-nt non-coding RNAs that are involved in critical cellular events, including rRNA/snRNA modification and splicing, ribosome genesis, telomerase formulation and cell proliferation. The identification of snoRNAs in the pig, which is a widely consumed commercial organism that also has important functions in medicine and biology, will enrich the snoRNA kingdom and provide evolutionary clues about snoRNAs. In this study, we performed a systematic identification of snoRNAs in Sus scrofa and obtained 120 candidate snoRNAs, 65 of which were predicted via sequencing from our constructed cDNA library. The others were obtained by computational screening. The primary structural features examined included the sequence length, GC content, conservation of common box motifs and nucleotide diversity. The results indicate that the primary features of H/ACA box snoRNAs are opposite to those of C/D box snoRNAs. Subsequently, based on chromosomal location and host gene determination, we assigned 91 snoRNAs to nine genome organization modes. Gene duplications and translocations are considered to contribute to the high abundant organization in evolution. Functional information about our novel snoRNAs, such as putative targets, modification sites and guide sequences, was predicted by orthologue alignment. A comparative analysis of predicted targets and possible modified loci on U6 snRNA and 5.8S and 18S rRNAs among five species revealed that targets of snoRNA are conserved among species. Furthermore, we performed a quantitative analysis of six representative snoRNA genes in two pig breeds during different developmental stages. Interestingly, all six snoRNAs from one breed expressed in a similar pattern over the tested time points; however, these same six genes had different expression patterns in the other pig breed. Specifically, expression of all six snoRNAs declined significantly from 65 to 90days post-coitus (dpc) and then increased slightly during adulthood in Tongcheng pigs, whereas the expression of the same six genes increased slowly from 65dpc until adulthood in Landrace pigs. This expression pattern suggests that most housekeeping, non-coding RNAs from a single pig breed may be similarly expressed during development. Our study adds to the knowledge about the snoRNA family by providing the first genome-wide study of porcine snoRNAs. The comparative analysis of snoRNAs from different pig breeds gave us evolutionary insight into the function of snoRNAs.

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