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Plant RNA Biology

Beyond the Central Dogma of Molecular Biology

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Research Interests

RNA biology and epigenetic

Our research has the goal to identify new components of RNA silencing pathways and to study their functions and mechanisms in plants, as well as to decode the genetic information and biology hidden in the RSS and REM in selected model organisms. Additionally, we study host/virus interplay at an epigenetic level. We apply a combination of genetic, molecular, biochemical, and the state-of-art-mics approaches to study our projects.

In the central dogma, RNA bridges the flow of genetic information from DNA to protein. Recent years have seen an explosion in the discovery of new species of RNAs and RNA-mediated processes. One group of tiny regulatory RNA molecules called miRNA or siRNA can guide RNA silencing to control various aspects of biology in eukaryotes including growth and development, stress responses, and antiviral defense. miRNA and sRNA are produced by Dicer or Dicer-like proteins, and loaded into Argonaute (AGO)-centered RNA-induced silencing complexes (RISCs). The RISCs execute the repressive or regulatory functions on target genes at transcriptional or post-transcriptional levels. One goal of our research is to identify new components of RNA silencing pathways and to study their functions and mechanisms in plants.

RNA is now also known to influence many aspects of biology through activities that are attributable to its secondary structure (RSS). In fact, RSS contains a new set of information code that is interpreted and processed by specialized protein complexes to regulate transcription, splicing, translation, localization, phase transition, and turnover. RSS can be further remodeled to meet specific functional needs in physiological conditions. Moreover, many RNA species undertake posttranscriptional RNA editing and/or epi-modification (REM) which even add more complexity to regulate gene expression and biological functions. Thus, another aspect of our research is to decode the genetic information and biology hidden in the RSS and REM in selected model organisms.

Plants utilize RNA silencing to defend themselves from exogenous nucleic acid invaders (i.e., viruses). As an anti-host defense mechanism, viruses encode suppressors that can inhibit RNA silencing responses to evade host surveillance. Although our knowledge of host/virus interaction has dramatically expanded at the post-transcriptional gene silencing level, our understanding of epigenetic silencing and viral suppression is still very poor. We use the mode DNA virus Geminivirus among other viruses to study host/virus interplay at an epigenetic level.

Recent Posts

  • Leica STELLARIS 5 confocal is on use now! January 11, 2023
  • Congrats on Zhen Wang for graduation in Dec. 2022. He is now Dr. Wang. January 7, 2023
  • Congrats on Tianru for successful qualification exam, now for being the latest Ph.D. candidate in the lab! April 5, 2022
  • Congrats on successful qualification exams to Niankui and Xingxing, now two new Ph.D. candidates! February 3, 2022
  • Congrats on Lin, Xingxing and Yanjun for acceptance of the paper in Science Advances February 1, 2022
  • Welcome on board, Gracie and Anthony! February 1, 2022

Archives

We are studying RNA silencing in the model organism Arabidopsis thaliana and several economically-important crops.

RNA silencing is a key regulatory process that controls various aspects of biology in eukaryotes including growth and development, antiviral defense and chromosome gardening. The common themes under RNA silencing include the biogenesis of small RNAs by DICERs or Dicer-like proteins and the incorporation of the small RNAs into Argonaute (AGO)-centered RNA-induced silencing complexes (RISCs). 

The RISCs execute the repressive or regulatory functions on target genes at the transcriptional or post-transcriptional levels.  Our long-term goals are to understand novel functions and mechanisms of RNA silencing in plants.

Get in touch

Biochemistry & Biophysics Blvd

2128 TAMU, Rm 316. College Station, TX 77840

e-mail: xiuren.zhang@tamu.edu

Tel: 979-458-0596

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