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Sana, T.R. et al.

Sana, Debets, Timans, Bazan, Kastelein,

Computational identification, cloning, and characterization of IL-1R9, a novel interleukin-1 receptor-like gene encoded over an unusually large interval of human chromosome Xq22.2-q22.3.

The Interleukin-1 receptor (IL-1R) and Toll signaling pathways share the evolutionarily conserved Toll homology domain (THD), which is a critical component in the signaling cascade of the host defense responses to infection and inflammation. Our initial genomic database searches uncovered a novel THD signature sequence between DNA markers DXS87 and DXS366. The feasibility of subsequently applying a coordinated computational approach, including various exon-finding programs, homology-based searches, and receptor profile searches, in revealing the exons encoding this novel IL-1R family member is described. IL-1R9 shows restricted expression in fetal brain and is highly homologous to IL1RAPL (A. Carrie et al., 1999 Nat. Genet. 23: 25-31), which is reportedly involved in nonsyndromic X-linked mental retardation. These genes are scattered over separate genomic intervals in excess of 1.0 Mb and encode receptors with extended C-terminal tails. In our functional NF-kappaB reporter assays, IL1RAPL, IL-1R9, or versions lacking the extended C-terminal sequences failed in responding either to IL-1 directly or to IL-18 when various permutations of IL-18R ectodomain chimeras were fused to their cytoplasmic domains. Evolutionary sequence analyses reinforce our conclusion that these novel orphan receptors probably form a functionally distinct subset of the IL-1R superfamily.[1]

References

Computational identification, cloning, and characterization of IL-1R9, a novel interleukin-1 receptor-like gene encoded over an unusually large interval of human chromosome Xq22.2-q22.3. Sana, T.R., Debets, R., Timans, J.C., Bazan, J.F., Kastelein, R.A. Genomics (2000) [Pubmed]

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