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Background  In yeast, birds and mammals, the SAPK-interacting protein 1 (Sin1) gene product has been implicated as a component of the stress-activated protein kinase (SAPK) signal transduction pathway. Recently, Sin1 has also been shown to interact with the carboxyl terminal end of the cytoplasmic domain of the ovine type I interferon receptor subunit 2 (IFNAR2). However, the function of Sin1 remains unknown. Since SAPK pathways are ancient and the IFN system is confined to vertebrates, the organization of the Sin1 gene and the sequences of the Sin1 protein have been compared across a wide taxonomic range of species.    Results  Sin1 is represented, apparently as a single gene, in all metazoan species and fungi but is not detectable in protozoa, prokaryotes, or plants. Sin1 is highly conserved in vertebrates (79–99% identity at amino acid level), which possess an interferon system, suggesting that it has been subjected to powerful evolutionary constraint that has limited its diversification.  Sin1 possesses at least two unique sequences in its IFNAR2-interacting region that are not represented in insects and other invertebrates. Sequence alignment between vertebrates and insects revealed five Sin1 strongly conserved domains (SCDs I-V), but an analysis of any of these domains failed to identify known functional protein motifs. SCD III, which is approximately 129 amino acids in length, is particularly highly conserved and is present in all the species examined, suggesting a conserved function from fungi to mammals. The coding region of the vertebrate Sin1 gene encompasses 11 exon and 10 introns, while in  C. elegans  the gene consists of 10 exons and 9 introns organized distinctly from those of vertebrates. In yeast and insects, Sin1 is intronless.    Conclusions  The study reveals the phylogeny of a little studied gene which has recently been implicated in two important signal transduction pathways, one ancient (stress response), one relatively new (interferon signaling).

The evolution of the Sin1 gene product, a little known protein implicated in stress responses and type I interferon signaling in vertebrates.