• Indranil Dasgupta

      Articles written in Journal of Biosciences

    • Begomovirus research in India: A critical appraisal and the way ahead

      Basanta K Borah Indranil Dasgupta

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      Begomoviruses are a large group of whitefly-transmitted plant viruses containing single-stranded circular DNA encapsidated in geminate particles. They are responsible for significant yield losses in a wide variety of crops in India. Research on begomoviruses has focussed on the molecular characterization of the viruses, their phylogenetic analyses, infectivities on host plants, DNA replication, transgenic resistance, promoter analysis and development of virus-based gene silencing vectors. There have been a number of reports of satellite molecules associated with begomoviruses. This article aims to summarize the major developments in begomoviral research in India in the last approximately 15 years and identifies future areas that need more attention.

    • Identification and validation of a virus-inducible ta-siRNA-generating TAS4 locus in tomato

      Archana Singh Shradha Saraf Indranil Dasgupta Sunil Kumar Mukherjee

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      Trans-acting small interfering RNAs (ta-siRNAs) are a class of endogenous small RNA, associated with posttranscriptional gene silencing. Their biogenesis requires an initial microRNA (miRNA)-mediated cleavage of precursor RNA. Around 20 different ta-siRNA-producing loci (TASs), whose sequences are conserved, are reported in plants. In tomato, two TAS gene families have been identified, which are found to target auxin response factor gene and bacterial spot disease resistance protein Bs4 gene. Using high-throughput computational and experimental approach, we identified a new locus-producing ta-siRNA in tomato. We have also identified the putative miRNA regulating the production of ta-siRNA from this locus. The ta-siRNAs generated from TAS4 were up-regulated upon infection with a DNA virus. The potential targets of ta-siRNAs were predicted to be variety of proteins including MYB transcription factors and cell cycle regulators for some of the ta-siRNAs produced.

    • Comprehensive molecular insights into the stress response dynamics of rice (Oryza sativa L.) during rice tungro disease by RNA-seq-based comparative whole transcriptome analysis

      GAURAV KUMAR INDRANIL DASGUPTA

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      Rice tungro is a serious viral disease of rice resulting from infection by two viruses, Rice tungro bacilliformvirus and Rice tungro spherical virus. To gain molecular insights into the global gene expression changes inrice during tungro, a comparative whole genome transcriptome study was performed on healthy and tungroaffectedrice plants using Illumina Hiseq 2500. About 10 GB of sequenced data comprising about 50 millionpaired end reads per sample were then aligned on to the rice genome. Gene expression analysis revealedaround 959 transcripts, related to various cellular pathways concerning stress response and hormonal homeostasisto be differentially expressed. The data was validated through qRT-PCR. Gene ontology and pathwayanalyses revealed enrichment of transcripts and processes similar to the differentially expressed genes categories.In short, the present study is a comprehensive coverage of the differential gene expression landscapeand provides molecular insights into the infection dynamics of the rice-tungro virus system.

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