@article {8503, title = {Clinical and pathogenetic features of ETV6 related thrombocytopenia with predisposition to acute lymphoblastic leukemia.}, journal = {Haematologica}, year = {2016}, month = {2016 Jun 30}, abstract = {

ETV6-related thrombocytopenia (ETV6-RT) is an autosomal dominant thrombocytopenia that has been recently identified in a few families and has been suspected to predispose to hematological malignancies. To gain further information on this disorder, we searched for ETV6 mutations in the 130 families with inherited thrombocytopenia of unknown origin from our cohort of 274 consecutive pedigrees with familial thrombocytopenia. We identified 20 ETV6-RT patients from 7 pedigrees. They have 5 different ETV6 variants, including three novel mutations affecting the highly conserved E26 transformation-specific domain. The relative frequency of ETV6-RT resulted 2.6\% in the whole case series and 4.6\% among the families with known forms of inherited thrombocytopenia. The degree of thrombocytopenia and bleeding tendency of ETV6-RT patients were mild, but 4 subjects developed B-cell acute lymphoblastic leukemia during childhood, resulting in a significantly increased incidence compared to the general population. Clinical and laboratory findings did not identify any peculiar defects that can be used to suspect this disorder by routine diagnostic workup. However, at variance with most inherited thrombocytopenias, platelet size was not enlarged. In vitro studies revealed that patients megakaryocytes have defective maturation and impaired proplatelet formation. Moreover, ETV6-RT platelets have reduced ability to spread on fibrinogen. Since also the dominant thrombocytopenias due to mutations in RUNX1 and ANKRD26 are characterized by normal platelet size and predispose to hematological malignancies, we suggest that mutation screening of ETV6, RUNX1 and ANKRD26 should be performed in all the subjects with autosomal dominant thrombocytopenia and normal platelet size.

}, issn = {1592-8721}, doi = {10.3324/haematol.2016.147496}, author = {Melazzini, Federica and Palombo, Flavia and Balduini, Alessandra and De Rocco, Daniela and Marconi, Caterina and Noris, Patrizia and Gnan, Chiara and Pippucci, Tommaso and Bozzi, Valeria and Faleschini, Michela and Barozzi, Serena and Doubek, Michael and Di Buduo, Christian A and Stano Kozubik, Katerina and Radova, Lenka and Loffredo, Giuseppe and Pospisilova, Sarka and Alfano, Caterina and Seri, Marco and Balduini, Carlo L and Pecci, Alessandro and Savoia, Anna} } @article {7700, title = {Germline mutations in ETV6 are associated with thrombocytopenia, red cell macrocytosis and predisposition to lymphoblastic leukemia.}, journal = {Nat Genet}, volume = {47}, year = {2015}, month = {2015 May}, pages = {535-8}, abstract = {

Some familial platelet disorders are associated with predisposition to leukemia, myelodysplastic syndrome (MDS) or dyserythropoietic anemia. We identified a family with autosomal dominant thrombocytopenia, high erythrocyte mean corpuscular volume (MCV) and two occurrences of B cell-precursor acute lymphoblastic leukemia (ALL). Whole-exome sequencing identified a heterozygous single-nucleotide change in ETV6 (ets variant 6), c.641C>T, encoding a p.Pro214Leu substitution in the central domain, segregating with thrombocytopenia and elevated MCV. A screen of 23 families with similar phenotypes identified 2 with ETV6 mutations. One family also had a mutation encoding p.Pro214Leu and one individual with ALL. The other family had a c.1252A>G transition producing a p.Arg418Gly substitution in the DNA-binding domain, with alternative splicing and exon skipping. Functional characterization of these mutations showed aberrant cellular localization of mutant and endogenous ETV6, decreased transcriptional repression and altered megakaryocyte maturation. Our findings underscore a key role for ETV6 in platelet formation and leukemia predisposition.

}, keywords = {Adult, Child, Preschool, DNA Mutational Analysis, Erythrocytes, Abnormal, Exome, Female, Genetic Association Studies, Genetic Predisposition to Disease, Germ-Line Mutation, HEK293 Cells, Hematologic Diseases, Humans, Male, Mutation, Missense, Pedigree, Precursor Cell Lymphoblastic Leukemia-Lymphoma, Proto-Oncogene Proteins c-ets, Repressor Proteins, Thrombocytopenia}, issn = {1546-1718}, doi = {10.1038/ng.3253}, author = {Noetzli, Leila and Lo, Richard W and Lee-Sherick, Alisa B and Callaghan, Michael and Noris, Patrizia and Savoia, Anna and Rajpurkar, Madhvi and Jones, Kenneth and Gowan, Katherine and Balduini, Carlo L and Pecci, Alessandro and Gnan, Chiara and De Rocco, Daniela and Doubek, Michael and Li, Ling and Lu, Lily and Leung, Richard and Landolt-Marticorena, Carolina and Hunger, Stephen and Heller, Paula and Gutierrez-Hartmann, Arthur and Xiayuan, Liang and Pluthero, Fred G and Rowley, Jesse W and Weyrich, Andrew S and Kahr, Walter H A and Porter, Christopher C and Di Paola, Jorge} }