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A novel RARA–SNX15 fusion in PML–RARA-positive acute promyelocytic leukemia with t(11;17;15)(q13;q21.2;q24.1)

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Abstract

Acute promyelocytic leukemia (APL) is characterized by a series of retinoic acid receptor (RAR) fusion genes that lead to the dysregulation of RAR signaling and onset of APL. PML–RARA is the most common fusion generated from t(15;17)(q24;q21). In addition, the reciprocal fusion RARA–PML is present in over 80% of t(15;17) APL cases. The bcr3 types of RARA–PML and RARA–PLZF in particular are reciprocal fusions that contribute to leukemogenesis. Here, we report a variant APL case with t(11;17;15)(q13;q21.2;q24.1). Massive parallel sequencing of patient RNA detected the novel fusion transcripts RARA–SNX15 and SNX15–LINC02255 along with the bcr3 type of PML–RARA. Genetic analysis revealed that RARA–SNX15L is an in-frame fusion due to intron retention caused by RNA mis-splicing. RARA–SNX15L consisted mainly of SNX15 domains, including the Phox-homology domain, which has a critical role in protein–protein interactions among sorting nexins and with other partners. Co-immunoprecipitation analysis revealed that RARA–SNX15L is directly associated with SNX15 and with itself. Further studies are needed to evaluate the biological significance of RARA–SNX15L in APL. In conclusion, this is the first report of APL with a complex chromosomal rearrangement involving SNX15.

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Acknowledgements

We are grateful to Dr. Nobuhiko Emi (Toyohashi Medical Center) for helpful discussions. This work was supported by grants-in-aid from Chubu University, Kyowa Kirin, and Daiichi-Sankyo.

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Authors and Affiliations

  1. Department of Hematology and Oncology, Nagoya City University Graduate School of Medical Sciences, Nagoya, Aichi, Japan

    Kentaro Hirade, Shigeru Kusumoto, Asahi Ito, Masaki Ri, Hirokazu Komatsu & Shinsuke Iida

  2. Department of Hematology, School of Medicine, Fujita Health University, Toyoake, Aichi, Japan

    Akihiro Abe

  3. Department of Biomedical Sciences, College of Life and Health Sciences, Chubu University, 1200 Matsumoto-cho, Kasugai, Aichi, 487-8501, Japan

    Hatsune Noritake & Yukiya Yamamoto

Authors
  1. Kentaro Hirade
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  2. Shigeru Kusumoto
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  3. Akihiro Abe
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  4. Hatsune Noritake
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  5. Asahi Ito
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  6. Masaki Ri
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  7. Hirokazu Komatsu
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  8. Shinsuke Iida
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  9. Yukiya Yamamoto
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Contributions

YY designed the research; YY and HN performed the research; YY, HN, and AA analyzed the data; KH, SK, AI, MR, HK, and SI collected the clinical data; YY wrote the manuscript.

Corresponding author

Correspondence to Yukiya Yamamoto.

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Hirade, K., Kusumoto, S., Abe, A. et al. A novel RARA–SNX15 fusion in PML–RARA-positive acute promyelocytic leukemia with t(11;17;15)(q13;q21.2;q24.1). Int J Hematol 116, 956–960 (2022). https://doi.org/10.1007/s12185-022-03421-w

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  • DOI: https://doi.org/10.1007/s12185-022-03421-w

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