Consequences of mutant TET2 on clonality and subclonal hierarchy

Cassandra M. Hirsch, Aziz Nazha, Kassy Kneen, Mohamed E. Abazeed, Manja Meggendorfer, Bartlomiej P. Przychodzen, Niroshan Nadarajah, Vera Adema, Yasunobu Nagata, Abhinav Goyal, Hassan Awada, Mohammad Fahad Asad, Valeria Visconte, Yihong Guan, Mikkael A. Sekeres, Ryszard Olinski, Babal Kant Jha, Thomas LaFramboise, Tomas Radivoyevitch, Torsten HaferlachJaroslaw P. Maciejewski*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

36 Scopus citations


Somatic mutations in TET2 are common in myelodysplastic syndromes (MDS), myeloproliferative, and overlap syndromes. TET2 mutant (TET2 MT ) clones are also found in asymptomatic elderly individuals, a condition referred to as clonal hematopoiesis of indeterminate potential (CHIP). In various entities of TET2 MT neoplasia, we examined the phenotype in relation to the strata of TET2 hits within the clonal hierarchy. Using deep sequencing, 1781 mutations were found in 1205 of 4930 patients; 40% of mutant cases were biallelic. Hierarchical analysis revealed that of TET2 MT cases >40% were ancestral, e.g., representing 8% of MDS. Higher (earlier) TET2 lesion rank within the clonal hierarchy (greater clonal burden) was associated with impaired survival. Moreover, MDS driven by ancestral TET2 MT is likely derived from TET2 MT CHIP with a penetrance of ~1%. Following ancestral TET2 mutations, individual disease course is determined by secondary hits. Using multidimensional analyses, we demonstrate how hits following the TET2 founder defect induces phenotypic shifts toward dysplasia, myeloproliferation, or progression to AML. In summary, TET2 MT CHIP-derived MDS is a subclass of MDS that is distinct from de novo disease.

Original languageEnglish (US)
Pages (from-to)1751-1761
Number of pages11
Issue number8
StatePublished - Aug 1 2018

ASJC Scopus subject areas

  • Hematology
  • Oncology
  • Cancer Research


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