Abstract
In mammals, the matrix extracellular phosphoglycoprotein (MEPE) is known to activate osteogenesis and mineralization via a particular region called dentonin, and to inhibit mineralization via its ASARM (acidic serine-aspartate rich MEPE-associated motif) peptide that also plays a role in phosphatemia regulation. In order to understand MEPE evolution in mammals, and particularly that of its functional regions, we conducted an evolutionary analysis based on the study of selective pressures. Using 37 mammalian sequences we: (1) confirmed the presence of an additional coding exon in most placentals; (2) highlighted several conserved residues and regions that could have important functions; (3) found that dentonin function was recruited in a placental ancestor; and (4) revealed that ASARM function was present earlier, pushing the recruitment of MEPE deep into amniote origins. Our data indicate that MEPE was involved in various functions (bone and eggshell mineralization) prior to acquiring those currently known in placental mammals.
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Acknowledgments
We express our sincere thanks to IFRO (Institut Français pour la Recherche Odontologique) for financial support to CB and to Dr Matthew Vickarious (Ontario Veterinary College, University of Guelph, Canada) for English corrections. We also are grateful to Professor Jorge Cubo (UPMC) for his help in performing statistical analyses and to Dr Guillaume Achaz (UPMC) for helpful discussion. This work was supported by CNRS and UPMC (UMR 7138) grants.
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18_2009_185_MOESM1_ESM.pdf
Alignment of the 37 amino acid sequences of mammalian MEPE. The human sequence was used as a reference sequence for this alignment, which takes into consideration mammalian relationships (see Fig. 1). Note that exon 3 and/or exon 4 are invalidated in some species. The 23 amino acid-long dentonin region (synthetical peptide AC-100) is located in the central region encoded by exon 5. It contains two important motifs, RGD and SGDG (boxed), which are preserved in most species. However, RGD is absent in several sequences and the two motifs are missing in marsupials. The amino acids of the ASARM peptide (Cterminus, boxed) are well conserved in all sequences studied, but in the two marsupials the ASARM sequence is followed by a dozen of residues. Newly identified important motifs are boxed in gray background. [ ] exon limits; (.) residue identical to human sequence; (-) Indel; (=) Unknown residue; (#) Residue identical in all sequences; (+) Residue identical in all therian sequences. (PDF 111 kb)
18_2009_185_MOESM2_ESM.jpg
Tree distance obtained using the distance matrix of the 37 mammalian MEPE. The relationships between species do not refelct current mammalian phylogeny (compare with Fig. 1). The species in which MEPE shows a high rate of evolution are artefactually attracted to the base of the tree (e.g., rodents and insectivores). (JPG 450 kb)
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Bardet, C., Delgado, S. & Sire, JY. MEPE evolution in mammals reveals regions and residues of prime functional importance. Cell. Mol. Life Sci. 67, 305–320 (2010). https://doi.org/10.1007/s00018-009-0185-1
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DOI: https://doi.org/10.1007/s00018-009-0185-1