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Transcriptome Profiling of Pediatric Core Binding Factor AML.

Chih-Hao Hsu1, Cu Nguyen1, Chunhua Yan1

  • 1Center for Biomedical Informatics and Information Technology, National Cancer Institute, Rockville, MD, 20850, United States of America.

Plos One
|September 24, 2015
PubMed
Summary
This summary is machine-generated.

Core binding factor acute myeloid leukemia (AML) subtypes, t(8;21) and Inv(16), share similar gene expression profiles, with distinct alternative splicing events and HOX gene dysregulation. These findings offer insights into CBF-AML biology.

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Area of Science:

  • Hematology
  • Genomics
  • Molecular Biology

Background:

  • Core binding factor acute myeloid leukemia (CBF-AML) comprises two common subtypes: t(8;21) and Inv(16).
  • These subtypes, while often grouped due to favorable outcomes, may possess distinct underlying molecular mechanisms.
  • Understanding these differences is crucial for refining treatment strategies and comprehending leukemogenesis.

Purpose of the Study:

  • To investigate the transcriptomic similarities and differences between t(8;21) and Inv(16) pediatric AML subtypes.
  • To identify specific genes, pathways, and alternative splicing events that distinguish these CBF-AML subtypes.
  • To compare the transcriptomes of CBF-AML subtypes against normal karyotype (NK) AML for a comprehensive molecular profile.

Main Methods:

  • RNA sequencing (RNA-seq) was performed on diagnostic samples from pediatric patients with t(8;21) AML (N=17), Inv(16) AML (N=14), and normal karyotype (NK) AML (N=33).
  • Differential gene expression analysis was conducted comparing t(8;21) and Inv(16) cohorts against the NK control cohort.
  • Alternative splicing events (ASEs) and de novo gene fusions were identified and analyzed across the cytogenetic subtypes.

Main Results:

  • A significant number of differentially expressed genes were identified in both t(8;21) (1291 genes) and Inv(16) (474 genes) AML compared to NK.
  • A majority of the commonly differentially expressed genes (175/198) showed consistent expression changes between t(8;21) and Inv(16) subtypes, indicating shared molecular alterations.
  • Distinct sets of alternative splicing events were observed, with 337 specific to t(8;21) and 407 specific to Inv(16). Homeobox (HOX) genes were notably down-regulated in both CBF-AML subtypes compared to NK.

Conclusions:

  • The t(8;21) and Inv(16) subtypes of pediatric AML exhibit more similarities than differences at the transcriptome level, suggesting a shared underlying biology.
  • Specific alternative splicing events and the dysregulation of HOX genes represent key molecular features contributing to CBF-AML pathogenesis.
  • These comprehensive transcriptome profiles provide valuable insights into the distinct and shared pathways in CBF-AML, aiding future research and therapeutic development.