The protein encoded by this gene is a cytokine receptor that specifically mediates the biological effects of interleukin 9 (IL9) . The functional IL9 receptor complex requires this protein as well as the interleukin 2 receptor , gamma (IL2RG) , a common gamma subunit shared by the receptors of many different cytokines. The ligand binding of this receptor leads to the activation of various JAK kinases and STAT proteins , which connect to different biologic responses. This gene is located at the pseudoautosomal regions of X and Y chromosomes. Genetic studies suggested an association of this gene with the development of asthma. Multiple pseudogenes on chromosome 9 , 10 , 16 , and 18 have been described. Alternatively spliced transcript variants have been found for this gene. [provided by RefSeq , Jul 2008] ,
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