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Nuclear Transcriptomes at High Resolution Using Retooled INTACT.

Mauricio A Reynoso1, Germain C Pauluzzi1, Kaisa Kajala2,3

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|September 29, 2017
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Summary
This summary is machine-generated.

Researchers adapted the Isolation of Nuclei Tagged to Specific Cell Types (INTACT) method for rice. This technique allows for high-resolution monitoring of the nuclear transcriptome and chromatin in specific rice cell types.

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Area of Science:

  • Plant molecular biology
  • Genomics
  • Cell biology

Background:

  • Isolated nuclei are crucial for studying gene regulation, chromatin, and RNA processing.
  • The INTACT (Isolation of Nuclei Tagged to Specific Cell Types) method enables cell-type-specific nuclear isolation.
  • Adapting INTACT for plants, particularly monocots like rice, is essential for detailed cellular studies.

Purpose of the Study:

  • To adapt and optimize the INTACT method for use in rice (Oryza sativa L.).
  • To develop cost-effective methods for nuclear isolation, T-DNA insertion mapping, and nuclear transcriptome profiling in rice.
  • To enable high-resolution analysis of nuclear RNA and chromatin in specific rice cell types.

Main Methods:

  • Modified the nuclear tagging fusion (NTF) protein by replacing its nuclear-envelope-targeting domain with an anchored domain.
  • Combined the modified NTF with codon-optimized Escherichia coli BirA in a single T-DNA construct.
  • Developed inexpensive protocols for INTACT, T-DNA insertion mapping, and nuclear transcriptome profiling, including a ribosomal RNA degradation method.

Main Results:

  • Successfully adapted INTACT for rice, enabling purification of biotinylated nuclei.
  • Developed efficient methods for T-DNA insertion mapping and complete nuclear transcriptome profiling.
  • Confirmed capture of pre-messenger RNA (pre-mRNA) and revealed significant differences between nuclear and total transcriptomes in rice root tips.

Conclusions:

  • The retooled INTACT method is effective for cell-type-specific nuclear isolation in rice.
  • This approach facilitates high-resolution monitoring of the nuclear transcriptome and chromatin in specific rice cell types.
  • The developed methods provide valuable tools for advancing plant molecular and cellular biology research.