Recurrent SPI1 (PU.1) fusions in high-risk pediatric T cell acute lymphoblastic leukemia

Masafumi Seki, Shunsuke Kimura, Tomoya Isobe, Kenichi Yoshida, Hiroo Ueno, Yaeko Nakajima-Takagi, Changshan Wang, Lin Lin, Ayana Kon, Hiromichi Suzuki, Yusuke Shiozawa, Keisuke Kataoka, Yoichi Fujii, Yuichi Shiraishi, Kenichi Chiba, Hiroko Tanaka, Teppei Shimamura, Kyoko Masuda, Hiroshi Kawamoto, Kentaro OhkiMotohiro Kato, Yuki Arakawa, Katsuyoshi Koh, Ryoji Hanada, Hiroshi Moritake, Masaharu Akiyama, Ryoji Kobayashi, Takao Deguchi, Yoshiko Hashii, Toshihiko Imamura, Atsushi Sato, Nobutaka Kiyokawa, Akira Oka, Yasuhide Hayashi, Masatoshi Takagi, Atsushi Manabe, Akira Ohara, Keizo Horibe, Masashi Sanada, Atsushi Iwama, Hiroyuki Mano, Satoru Miyano, Seishi Ogawa, Junko Takita

Research output: Contribution to journalArticlepeer-review

46 Citations (Scopus)

Abstract

The outcome of treatment-refractory and/or relapsed pediatric T cell acute lymphoblastic leukemia (T-ALL) is extremely poor, and the genetic basis for this is not well understood. Here we report comprehensive profiling of 121 cases of pediatric T-ALL using transcriptome and/or targeted capture sequencing, through which we identified new recurrent gene fusions involving SPI1 (STMN1-SPI1 and TCF7-SPI1). Cases positive for fusions involving SPI1 (encoding PU.1), accounting for 3.9% (7/181) of the examined pediatric T-ALL cases, showed a double-negative (DN; CD4 - CD8 -) or CD8 + single-positive (SP) phenotype and had uniformly poor overall survival. These cases represent a subset of pediatric T-ALL distinguishable from the known T-ALL subsets in terms of expression of genes involved in T cell precommitment, establishment of T cell identity, and post-β-selection maturation and with respect to mutational profile. PU.1 fusion proteins retained transcriptional activity and, when constitutively expressed in mouse stem/progenitor cells, induced cell proliferation and resulted in a maturation block. Our findings highlight a unique role of SPI1 fusions in high-risk pediatric T-ALL.

Original languageEnglish
Pages (from-to)1274-1281
Number of pages8
JournalNature genetics
Volume49
Issue number8
DOIs
Publication statusPublished - 2017 Aug 1

ASJC Scopus subject areas

  • Genetics

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