Abstract
Circulating platelets are continually replenished by fragmentation of terminally differentiated megakaryocytes. Processes disrupted in inherited thrombocytopenias frequently shed light on normal thrombopoietic mechanisms. An especially rare condition called Paris-Trousseau syndrome (PTS) seems to occur by virtue of hemizygous loss of the FLI1 transcription factor gene. Provocative new data suggest that FLI1 shows monoallelic expression during a brief window in megakaryocyte differentiation, which thus explains the dominant inheritance pattern of PTS despite the presence of one normal FLI1 allele .
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