Journal
BLOOD
Volume 133, Issue 25, Pages 2630-2631Publisher
AMER SOC HEMATOLOGY
DOI: 10.1182/blood-2019-04-901132
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The discovery by exome sequencing that calreticulin (CALR) gene mutations are important gain-of-function myeloproliferative neoplasm (MPN) driver mutations(1,2) was as inexplicable as it was unexpected. In this issue of Blood, Pecquet et al(3) report that mutated CALR behaves like a rogue chaperone, usurping the role of JAK2 and promiscuously transporting immature or trafficdefective thrombopoietin receptors (TpoRs) to the cell surface from the endoplasmic reticulum (ER) (see figure).
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