Inactivation of polycomb repressive complex 2 components in myeloproliferative and myelodysplastic/myeloproliferative neoplasms

Blood - Tập 119 - Trang 1208-1213 - 2012
Joannah Score1,2, Claire Hidalgo-Curtis1,2, Amy V. Jones1,2, Nils Winkelmann2,3, Alison Skinner2, Daniel Ward2, Katerina Zoi4, Thomas Ernst3, Frank Stegelmann5, Konstanze Döhner5, Andrew Chase1,2, Nicholas C.P. Cross1,2
1Faculty of Medicine, University of Southampton, Southampton, United Kingdom
2Wessex Regional Genetics Laboratory, Salisbury, United Kingdom
3Klinik Für Innere Medizin II, Universitätsklinikum Jena, Jena, Germany
4Haematology Research Laboratory, Biomedical Research Foundation, Academy of Athens, Athens, Greece
5Department of Internal Medicine III, University Hospital of Ulm, Ulm, Germany

Tóm tắt

AbstractThe polycomb repressive complex 2 (PRC2) is a highly conserved histone H3 lysine 27 methyltransferase that regulates the expression of developmental genes. Inactivating mutations of the catalytic component of PRC2, EZH2, are seen in myeloid disorders. We reasoned that the other 2 core PRC2 components, SUZ12 and EED, may also be mutational targets in these diseases, as well as associated factors such as JARID2. SUZ12 mutations were identified in 1 of 2 patients with myelodysplastic syndrome/myeloproliferative neoplasms with 17q acquired uniparental disomy and in 2 of 2 myelofibrosis cases with focal 17q11 deletions. All 3 were missense mutations affecting the highly conserved VEFS domain. Analysis of a further 146 myelodysplastic syndrome/myeloproliferative neoplasm patients revealed an additional VEFS domain mutant, yielding a total mutation frequency of 1.4% (2 of 148). We did not find mutations of JARID2 or EED in association with acquired uniparental disomy for chromosome 6p or 11q, respectively; however, screening unselected cases identified missense mutations in EED (1 of 148; 1%) and JARID2 (3 of 148; 2%). All 3 SUZ12 mutations tested and the EED mutation reduced PRC2 histone methyltransferase activity in vitro, demonstrating that PRC2 function may be compromised in myeloid disorders by mutation of distinct genes.

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