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The heat shock cognate 80 gene of tomato is flanked by matrix attachment regions

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Abstract

Matrix attachment regions (MARs) are thought to participate in the organization and segregation of independent chromosomal loop domains. Although there are several reports on the action of MARs in the context of heterologous genes, information is more limited on the role of MARs associated with plant genes. Transgenic studies suggest that the upstream, intron and downstream regions of the developmentally regulated heat shock cognate 80 gene (HSC80) of tomato participate in chromatin organization. In this study, we tested the in vitro affinity of the HSC80 gene to chromosomal scaffolds prepared from shoot apices of tomato. We found that a 1.5 kb upstream region and a 1.4 kb downstream region, but not the intron region, are MARs. These MARs interact with tomato and pea scaffolds and bind regardless of the expression status of HSC80 in the tissue from which the nuclei were isolated. Comparison to two known yeast MARs ARS1 and CENIII, showed that the HSC80 5′MAR binds more avidly to tomato scaffolds than ARS1, while no binding of CENIII was observed. Competition binding between the two HSC80 MARs indicated that the 5′ MAR can outcompete the 3′ MAR and not vice versa. Last, we observed that the interaction of the 3′ MAR with the scaffold could result in an electrophoretic mobility shift resistant to SDS, protease, and phenol treatment. In conclusion, MARs whose binding properties can be clearly differentiated are closely flanking the HSC80 gene. The discovery of MARs in regions which have a distinct function in HSC80 transgenes but not in transient expression assays, is consistent with a chromosomal scaffold role in HSC80 gene regulation.

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  1. Department of Botany, University of Washington, Box 355325, 98195-5325, Seattle, WA, USA

    Anna M. Chinn & Luca Comai

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  1. Anna M. Chinn
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  2. Luca Comai
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Chinn, A.M., Comai, L. The heat shock cognate 80 gene of tomato is flanked by matrix attachment regions. Plant Mol Biol 32, 959–968 (1996). https://doi.org/10.1007/BF00020492

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  • DOI: https://doi.org/10.1007/BF00020492

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