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Omeros Has Now Unlocked Over Half of the Class A Orphan GPCRs
Date:8/15/2012

SEATTLE, Aug. 15, 2012 /PRNewswire/ -- Omeros Corporation (NASDAQ: OMER) today announced that it has identified compounds that functionally interact with each of five additional orphan G protein-coupled receptors (GPCRs). Without compounds that functionally interact with orphan GPCRs, developing drugs targeting those receptors is extremely difficult. Omeros has now unlocked 42 Class A orphan GPCRs, representing over half of these targets. There are approximately 120 orphan GPCRs and Omeros expects to unlock a large percentage of them, focusing first on Class A orphans.

The five additional orphan GPCRs unlocked by Omeros are GPR22, GPR45, GPR63, GPR162 and GPR171. GPR22 has been linked to osteoarthritis and is highly expressed in osteoarthritic cartilage while almost absent in healthy cartilage. GPR63 has been connected to autism, a developmental disorder affecting social and communication skills in an estimated 1 in 88 children in the United States. GPR162 is predominantly expressed in the brain, specifically in regions such as the hypothalamus, amygdala, striatum and hippocampus, which are associated with a variety of neuropsychiatric disorders. While the physiological roles of GPR45 and GPR171 have yet to be definitively determined, GPR45 appears to be exclusively expressed in the brain and GPR171 is thought to regulate differentiation of hematopoietic stem cells. Omeros is in the process of filing broad patent applications around the orphan GPCRs that it has unlocked and compound optimization efforts are in progress.

"We continue to add to our estate of unlocked orphan GPCRs and are methodically building a patent position around each," said Gregory A. Demopulos, M.D., chairman and chief executive officer of Omeros.  "Our proprietary screening assay has identified as many as 80 discrete compounds against a given receptor with potencies as low as 20 nanomol
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