JAGN1 deficiency causes aberrant myeloid cell homeostasis and congenital neutropenia.
Authors:
Boztug, K Jarvinen, PM Salzer, E Racek, T Monch, S Garncarz, W Gertz, EM Schaffer, AA Antonopoulos, A Haslam, SM Schieck, L Puchalka, J Diestelhorst, J Appaswamy, G Lescoeur, B Giambruno, R Bigenzahn, JW Elling, U Pfeifer, D Conde, CD Albert, MH Welte, K Brandes, G Sherkat, R Van der Werff Ten Bosch, J Rezaei, N Etzioni, A Bellanne-Chantelot, C Superti-Furga, G Penninger, JM Bennett, KL Von Blume, J Dell, A Donadieu, J Klein, C
The analysis of individuals with severe congenital neutropenia (SCN) may shed light on the delicate balance of factors controlling the differentiation, maintenance and decay of neutrophils. We identify 9 distinct homozygous mutations in the JAGN1 gene encoding Jagunal homolog 1 in 14 individuals with SCN. JAGN1-mutant granulocytes are characterized by ultrastructural defects, a paucity of granules, aberrant N-glycosylation of multiple proteins and increased incidence of apoptosis. JAGN1 participates in the secretory pathway and is required for granulocyte colony-stimulating factor receptor-mediated signaling. JAGN1 emerges as a factor that is necessary in the differentiation and survival of neutrophils.