New cause for primary immunodeficiency discovered

Our lab has a new study on primary immunodeficiencies out now at Cellular & Molecular Biology! We studied two families with combined immunodeficiency and found mutations in the Calcium channel ITPR3. The mutations reduce the function of the channel, making the channels 100-fold less capable of initiating a Calcium flux after cellular stimulation. T cells from the patient had poor responses throughout the signalling cascade: reduced Calcium flux, poor nuclear localisation of NFAT1 and reduced proliferative burst, explaining the impeded response to infections. The most severe patient required a bone-marrow transplantation to correct the defect, while the other patient is doing well with regular IgIV treatment. The work established ITPR3 as a new cause of primary immunodeficiency, after previously assuming that these Calcium channels had too much redundancy to be a cause of genetic disease. Read the full paper here, or take a look at the illustrated abstract below for a short-cut summary!

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