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基于转录组测序的缺须盆唇鱼微卫星标记特征分析

Characteristics Analysis of SSR Markers Based on Transcriptomic Sequenceing of Placocheilus cryptonemus

  • 摘要: 缺须盆唇鱼(Placocheilus cryptonemus)是云南省怒江流域特有的一种高原经济鱼类。通过在Illumina HiSeq 2500平台上对缺须盆唇鱼进行转录组测序(RNA-seq)分析,利用MicroSAtellite (MISA)微卫星识别工具对1~6个碱基重复、碱基数在10 bp以上的微卫星进行鉴定。结果表明,在缺须盆唇鱼转录组中共发现分布在36 764条Unigene上的30 500个SSR位点,包含序列的SSR数量为18 078,发生频率为49.17%。获得的单纯SSR中共有215种重复基元,其中单核苷酸重复基元类型数量最多,为88个,六碱基重复的SSR最少,其他的重复从二、三、四、五、六碱基开始,SSR的形成呈现递减规律。SSR位点的重复次数主要发生在6~10次和11~15次重复之间,发生频率分别为38.59%和36.02%。本研究对缺须盆唇鱼的转录组数据进行测序鉴定,得到了数量较多的SSR标记,同时对得到的缺须盆唇鱼SSR数据特点进行归纳总结。本研究不仅提供了一个有价值的转录组资源,而且建立了一套SSR标记,可以为缺须盆唇鱼的基础研究、应用研究提供有效的分子标记。

     

    Abstract: Placocheilus cryptonemus is a kind of plateau economic fish endemic to Nujiang river basin, Yunnan Province, China. Transcriptome sequencing of Placocheilus cryptonemus was performed on Illumina HiSeq 2500 platform, and the MicroSAtellite(MISA) software was used to identify microsatellites with 1~6 bases repeated and base number over 10 bp. The results showed that a total of 30 500 SSR sites were found at the transcriptome level,distributing in 36 764 Unigene, and the number of SSRs containing sequences was 18 078, with the occurrence frequency of 49.17%. In the obtained simple SSR, there were 215 types of repeat primitive, among which the number of single nucleotide repeat primitive types was the largest(88). SSRs with repeated 2, 3, 4, 5 and 6 bases shawed an obvious decreasing rule, and SSRs with repeated 6 bases were the least. The frequency of SSR repetition mainly occurred between 6~10 and 11~15 repetitions, with the frequency of 38.59% and 36.02%, respectively. This study performed transcriptome sequencing analysis of Placocheilus cryptonemus, obtained a large number of SSR markers, and summarized SSR distribution characteristics of P. cryptonemus. This study not only provided a valuable transcriptomic resource, but also established a set of SSR markers, which can provide effective molecular markers for basic and applied research of Placocheilus cryptonemus.

     

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