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Ferritin gene organization: Differences between plants and animals suggest possible kingdom-specific selective constraints

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Abstract

Ferritin, a protein widespread in nature, concentrates iron −1011−1012-fold above the solubility within a spherical shell of 24 subunits; it derives in plants and animals from a common ancestor (based on sequence) but displays a cytoplasmic location in animals compared to the plastid in contemporary plants. Ferritin gene regulation in plants and animals is altered by development, hormones, and excess iron; iron signals target DNA in plants but mRNA in animals. Evolution has thus conserved the two end points of ferritin gene expression, the physiological signals and the protein structure, while allowing some divergence of the genetic mechanisms.

Comparison of ferritin gene organization in plants and animals, made possible by the cloning of a dicot (soy-bean) ferritin gene presented here and the recent cloning of two monocot (maize) ferritin genes, shows evolutionary divergence in ferritin gene organization between plants and animals but conservation among plants or among animals; divergence in the genetic mechanism for iron regulation is reflected by the absence in all three plant genes of the IRE, a highly conserved, noncoding sequence in vertebrate animal ferritin mRNA. In plant ferritin genes, the number of introns (n = 7) is higher than in animals (n = 3). Second, no intron positions are conserved when ferritin genes of plants and animals are compared, although all ferritin gene introns are in the coding region; within kingdoms, the intron positions in ferritin genes are conserved. Finally, secondary protein structure has no apparent relationship to intron/exon boundaries in plant ferritin genes, whereas in animal ferritin genes the correspondence is high. The structural differences in introns/exons among phylogenetically related ferritin coding sequences and the high conservation of the gene structure within plant or animal kingdoms suggest that kingdom-specific functional constraints may exist to maintain a particular intron/exon pattern within ferritin genes. In the case of plants, where ferritin gene intron placement is unrelated to triplet codons or protein structure, and where ferritin is targeted to the plastid, the selection pressure on gene organization may relate to RNA function and plastid/nuclear signaling.

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  1. Department of Biochemistry, North Carolina State University, NCSU, Box 7622, 27695-7622, Raleigh, NC, USA

    D. Proudhon, J. Wei & E. C. Theil

  2. Laboratoire de Biochimie et Physiologic Végétales, CNRS UR 573 INRA-ENSA, 2, place Viala, F-34060, Montpellier cédex 1, France

    J. -F. Briat

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  1. D. Proudhon
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Proudhon, D., Wei, J., Briat, J.F. et al. Ferritin gene organization: Differences between plants and animals suggest possible kingdom-specific selective constraints. J Mol Evol 42, 325–336 (1996). https://doi.org/10.1007/BF02337543

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