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Makaryan V; Rosenthal EA; Bolyard AA; Kelley ML; Below JE; Bamshad MJ; Bofferding KM; Smith JD; Buckingham K; Boxer LA; Skokowa J; Welte K; Nickerson DA; Jarvik GP; Dale DC
Hum Mutat 2014[Jul]; 35 (7): 824-7 PMID24753205show ga
Severe congenital neutropenia (SCN) is a rare hematopoietic disorder, with estimated incidence of 1 in 200,000 individuals of European descent, many cases of which are inherited in an autosomal dominant pattern. Despite the fact that several causal genes have been identified, the genetic basis for >30% of cases remains unknown. We report a five generation family segregating a novel single nucleotide variant (SNV) in TCIRG1. There is perfect co-segregation of the SNV with congenital neutropenia in this family; all 11 affected, but none of the unaffected, individuals carry this novel SNV. Western blot analysis show reduced levels of TCIRG1 protein in affected individuals, compared to healthy controls. Two unrelated patients with SCN, identified by independent investigators, are heterozygous for different, rare, highly conserved, coding variants in TCIRG1.