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- W2171149082 abstract "Recurrent loss of heterozygosity (LOH) in 4q24 in patients with myeloid malignancies has led to the identifi cation of mutations in TET2 in diff erent myeloid neoplasms including myeloproliferative neoplasm (MPN), myelodysplastic syndrome (MDS), mixed myelodysplastic/myeloproliferative neoplasm (MDS/MPN) and acute myeloid leukemia (AML) [1 – 13]. Th eir impact on prognosis remains unresolved, and the mechanisms by which TET2 leads to transformation remain unclear. Based on its homology to TET1, it is possible that TET2 may play a role in epigenetic regulation [14] via the presence of catalytic domains in the two highly conserved regions of the gene. Mutations in these two regions could, by this mechanism, lead to inactivation of a specifi c tumor suppressor gene and/or activation of pro-proliferative pathways, although mutations in other areas of the gene could also result in a modifi cation of the protein. Studies using murine models of Tet2 inactivation show that inactivation of this gene establishes important roles for Tet2 in hematopoiesis and the development of myeloproliferative disease. Beacuse TET2 alterations in patients are commonly heterozygous, TET2 haploinsuffi ciency could be enough to promote defects in a hematopoietic progenitor and myeloproliferation [15]. We have collected data on all TET2 mutations published to date [1 – 13] (a total of 725 mutations in 3274 patients) (Table I) in order to analyze whether: (a) they are evenly distributed throughout the gene, (b) diff erent mutation types (missense, nonsense or frameshift) are more prevalent in diff erent regions of the gene and (c) distinct mutational patterns are found in diff erent types of myeloid neoplasms. To this end, we divided the sequence of the TET2 gene into four regions. Region B1 ( Box 1 ) and region B2 ( Box 2 ) are highly conserved in several species and in all three proteins of the TET family. Th e other two regions, which we denominated F1 and F2, are non-conserved regions (Figure 1). We calculated the frequency of mutations per amino acid in each of these regions (number of mutations divided by the number of amino acids" @default.
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- W2171149082 date "2012-04-02" @default.
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- W2171149082 title "A meta-analysis of <i>TET2</i> mutations shows a distinct distribution pattern in <i>de novo</i> acute myeloid leukemia and chronic myelomonocytic leukemia" @default.
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- W2171149082 doi "https://doi.org/10.3109/10428194.2011.639878" @default.
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