Identification and characterization of integrin-binding sialoprotein (IBSP) genes in reptile and amphibian

Gene
Seikou ShintaniTakashi Ooshima

Abstract

Integrin-binding sialoprotein (IBSP) is a member of the small integrin-binding ligand N-linked glycoprotein (SIBLING) family; and the whole SIBLING family is further included in a larger secretory calcium-binding phosphoprotein (SCPP) family. SIBLING proteins are known to construct a part of the non-collagenous extracellular matrices of calcified tissues, and considered to have arisen by duplication and subsequent divergent evolution of a single ancient gene. To understand the alterations of SIBLING molecules associated with the evolution of calcified tissues in vertebrates, we initiated a search for lower vertebrate orthologs of SIBLING genes. In the present study, an IBSP ortholog from a reptile (caiman) and two distinct orthologs from an amphibian (African clawed toad) were identified and characterized. As expected, the toad IBSP genes were transcribed only in calcified tissue (jaw and tibia), as also seen in mammals. The caiman, toad, avian, and mammalian IBSPs share several unique features specific for IBSP and apparently have similar properties. Furthermore, analysis of the sequences suggested that the IBSP molecule might have gradually intensified its functions related to calcification during its evolutionary process thr...Continue Reading

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Citations

Nov 20, 2009·Cellular and Molecular Life Sciences : CMLS·Claire BardetJean-Yves Sire
Oct 10, 2013·Journal of Experimental Zoology. Part B, Molecular and Developmental Evolution·Tomoko YonekuraSeikou Shintani
Jun 6, 2012·Current Opinion in Genetics & Development·Shannon Fisher, Tamara Franz-Odendaal
Jun 5, 2016·Biological Trace Element Research·Miao SongLi Gao

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