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Journal Article
Research Support, U.S. Gov't, P.H.S.
Nuclear Transcriptomes at High Resolution Using Retooled INTACT.
Plant Physiology 2018 January
Isolated nuclei provide access to early steps in gene regulation involving chromatin as well as transcript production and processing. Here, we describe transfer of the isolation of nuclei from tagged specific cell types (INTACT) to the monocot rice ( Oryza sativa L.). The purification of biotinylated nuclei was redesigned by replacing the outer nuclear-envelope-targeting domain of the nuclear tagging fusion (NTF) protein with an outer nuclear-envelope-anchored domain. This modified NTF was combined with codon-optimized Escherichia coli BirA in a single T-DNA construct. We also developed inexpensive methods for INTACT, T-DNA insertion mapping, and profiling of the complete nuclear transcriptome, including a ribosomal RNA degradation procedure that minimizes pre-ribosomal RNA (pre-rRNA) transcripts. A high-resolution comparison of nuclear and steady-state poly(A)+ transcript populations of seedling root tips confirmed the capture of pre-messenger RNA (pre-mRNA) and exposed distinctions in diversity and abundance of the nuclear and total transcriptomes. This retooled INTACT can enable high-resolution monitoring of the nuclear transcriptome and chromatin in specific cell types of rice and other species.
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