Abstract
Plant miRNAs (18-24nt) are generated by the RNase III-type Dicer endonuclease from the endogenous hairpin precursors (‘pre-miRNAs’) with significant regulatory functions. The transcribed regions display a higher frequency of microsatellites, when compared to other regions of the genomic DNA. Simple sequence repeats (SSRs) resulting from replication slippage occurring in transcripts affect the expression of genes. The available experimental evidence for the incidence of SSRs in the miRNA precursors is limited. Considering the potential significance of SSRs in the miRNA genes, we carried out a preliminary analysis to verify the presence of SSRs in the pri-miRNAs of black pepper (Piper nigrum L.). We isolated a (CT) dinucleotide SSR bearing transcript using SMART strategy. The transcript was predicted to be a ‘pri-miRNA candidate’ with Dicer sites based on miRNA prediction tools and MFOLD structural predictions. The presence of this ‘miRNA candidate’ was confirmed by real-time TaqMan assays. The upstream sequence of the ‘miRNA candidate’ by genome walking when subjected to PlantCARE showed the presence of certain promoter elements, and the deduced amino acid showed significant similarity with NAP1 gene, which affects the transcription of many genes. Moreover the hairpin-like precursor overlapped the neighbouring NAP1 gene. In silico analysis revealed distinct putative functions for the ‘miRNA candidate’, of which majority were related to growth. Hence, we assume that this ‘miRNA candidate’ may get activated during transcription of NAP gene, thereby regulating the expression of many genes involved in developmental processes.
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Acknowledgements
The authors thank Department of BioTechnology, Government of India for the financial support and Beijing Genomics Institute (Shenzhen, China) for the de novo transcriptome assembly of black pepper.
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Joy, N., Soniya, E.V. Identification of an miRNA candidate reflects the possible significance of transcribed microsatellites in the hairpin precursors of black pepper. Funct Integr Genomics 12, 387–395 (2012). https://doi.org/10.1007/s10142-012-0267-2
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DOI: https://doi.org/10.1007/s10142-012-0267-2