Trafficking and localization of KNOTTED1 related mRNAs in shoot meristems

Kitagawa, Munenori, Xu, Xiaosa, Jackson, David (2022) Trafficking and localization of KNOTTED1 related mRNAs in shoot meristems. Communicative and Integrative Biology, 15 (1). pp. 158-163. ISSN 1942-0889

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URL: https://www.ncbi.nlm.nih.gov/pubmed/35832536
DOI: 10.1080/19420889.2022.2095125

Abstract

Multicellular organisms use transcripts and proteins as signaling molecules for cell-to-cell communication. Maize KNOTTED1 (KN1) was the first homeodomain transcription factor identified in plants, and functions in maintaining shoot stem cells. KN1 acts non-cell autonomously, and both its messenger RNA (mRNA) and protein traffic between cells through intercellular nanochannels called plasmodesmata. KN1 protein and mRNA trafficking are regulated by a chaperonin subunit and a catalytic subunit of the RNA exosome, respectively. These studies suggest that the function of KN1 in stem cell regulation requires the cell-to-cell transport of both its protein and mRNA. However, in situ hybridization experiments published 25 years ago suggested that KN1 mRNA was missing from the epidermal (L1) layer of shoot meristems, suggesting that only the KN1 protein could traffic. Here, we show evidence that KN1 mRNA is present at a low level in L1 cells of maize meristems, supporting an idea that both KN1 protein and mRNA traffic to the L1 layer. We also summarize mRNA expression patterns of KN1 homologs in diverse angiosperm species, and discuss KN1 trafficking mechanisms.

Item Type: Paper
Subjects: bioinformatics > genomics and proteomics > genetics & nucleic acid processing > protein structure, function, modification > protein types > knotted1
bioinformatics > genomics and proteomics > genetics & nucleic acid processing > DNA, RNA structure, function, modification > genes, structure and function > genes: types > knotted1
organs, tissues, organelles, cell types and functions > tissues types and functions > meristem
CSHL Authors:
Communities: CSHL labs > Jackson lab
SWORD Depositor: CSHL Elements
Depositing User: CSHL Elements
Date: 2022
Date Deposited: 21 Jul 2022 21:36
Last Modified: 21 Jul 2022 21:36
PMCID: PMC9272838
URI: https://repository.cshl.edu/id/eprint/40681

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