This gene encodes the catalytic subunit of glucose 6-phosphatase (G6Pase). G6Pase is located in the endoplasmic reticulum (ER) and catalyzes the hydrolysis of glucose 6-phosphate to glucose and phosphate in the last step of the gluconeogenic and glycogenolytic pathways.[5]
G6PC3 deficiency results in a phenotypic continuum.[9][10] At one end the affected individuals have only neutropenia and related complications but no other organ is affected. This is sometimes referred to as non-syndromic or isolated severe congenital neutropenia.[11] Most affected individuals have a classic form of the disease with severe congenital neutropenia and cardiovascular and/or urogenital abnormalities.[12][13] Some individuals have severe G6PC3 deficiency (also known as Dursun syndrome) and they have all the features of classic G6PC3 deficiency but in addition show involvement of non-myeloid hematopoietic cell lines, some other extra-hematologic features and pulmonary hypertension.[14]
^Banka S, Wynn R, Byers H, Arkwright PD, Newman WG (February 2013). "G6PC3 mutations cause non-syndromic severe congenital neutropenia". Molecular Genetics and Metabolism. 108 (2): 138–41. doi:10.1016/j.ymgme.2012.12.001. PMID23298686.
^Boztug K, Rosenberg PS, Dorda M, Banka S, Moulton T, Curtin J, et al. (April 2012). "Extended spectrum of human glucose-6-phosphatase catalytic subunit 3 deficiency: novel genotypes and phenotypic variability in severe congenital neutropenia". The Journal of Pediatrics. 160 (4): 679–683.e2. doi:10.1016/j.jpeds.2011.09.019. PMID22050868.
