Synonyms: Calcium and DAG-regulated guanine nucleotide exchange factor II,CALDAG-GEFI,CalDAG-GEFII,GRP1,Guanine nucleotide exchange factor, calcium and DAG regulated, Rap1A,hRasGRP1,Ras activator RasGRP,RAS guanyl nucleotide releasing protein 1,RAS guanyl releasing protein 1 (calcium and DAG-regulated),RAS guanyl releasing protein 1,RAS guanyl-releasing protein 1,Ras guanyl-releasing protein,RASGRP,rasgrp1,V
Background: This gene is a member of a family of genes characterized by the presence of a Ras superfamily guanine nucleotide exchange factor (GEF) domain. It functions as a diacylglycerol (DAG)-regulated nucleotide exchange factor specifically activating Ras through the exchange of bound GDP for GTP. It activates the Erk/MAP kinase cascade and regulates T-cells and B-cells development, homeostasis and differentiation. Alternatively spliced transcript variants encoding different isoforms have been identified. Altered expression of the different isoforms of this protein may be a cause of susceptibility to systemic lupus erythematosus (SLE).