FLI1, a member of the ETS transcription factor family, is associated with Paris-Trousseau thrombocytopenia, and germline FLI1 mutations have been identified in patients with inherited platelet disorders. We generated the iPSC line SANI011-A from a patient carrying a de novo heterozygous nonsense mutation, FLI1 c.297del. Proerythroblasts derived from the patient's peripheral blood were reprogrammed into iPSCs using the non-integrative Sendai virus (SeV) delivery method. The resulting iPSC line exhibited normal karyotype, expressed pluripotent markers, and demonstrated the capacity for trilineage differentiation. The iPSC line provides a valuable model for studying hematopoiesis, particularly megakaryopoiesis and FLI1-related platelet disorders.

Hemizygous deletion of a variable region on chromosome 11q containing FLI1 causes an inherited platelet-related bleeding disorder in Paris-Trousseau thrombocytopenia and Jacobsen syndrome. These multisystem disorders are also characterized by heart anomalies, changes in facial structure, and intellectual disability. We have identified a consanguineous family with autosomal recessive inheritance of a bleeding disorder that mimics Paris-Trousseau thrombocytopenia but has no other features of the 11q23 deletion syndrome. Affected individuals in this family have moderate thrombocytopenia; absent collagen-induced platelet aggregation; and large, fused α-granules in 1% to 5% of circulating platelets. This phenotype was caused by a FLI1 homozygous c.970C>T-point mutation that predicts an arginine-to-tryptophan substitution in the conserved ETS DNA-binding domain of FLI1. This mutation caused a transcription defect at the promoter of known FLI1 target genes GP6, GP9, and ITGA2B, as measured by luciferase assay in HEK293 cells, and decreased the expression of these target proteins in affected members of the family as measured by Western blotting of platelet lysates. This kindred suggests abnormalities in FLI1 as causative of Paris-Trousseau thrombocytopenia and confirms the important role of FLI1 in normal platelet development.