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In Ovo Xenografting of Patient-Derived Acute Lymphoblastic Leukemia (ALL) Cells (PDX-ALL)
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517
CRLF2 expression associates with ICN1 stabilization in T-cell acute lymphoblastic leukemia
Ana Luiza Tardem Maciel1, Caroline Pires Poubel1, Elda Pereira Noronha2
1Molecular Cancer Study Group, Division of Clinical Research, Research Centre, Instituto Nacional de Câncer - INCA, Rio de Janeiro, Rio de Janeiro, Brazil.
Genes, Chromosomes & Cancer
|December 23, 2018
Summary
CRLF2 overexpression is linked to specific NOTCH1 mutations in T-cell acute lymphoblastic leukemia (T-ALL). This finding clarifies a molecular mechanism in high-risk T-ALL, impacting prognostic understanding.
Area of Science:
- Hematology
- Molecular Biology
- Oncology
Background:
- T-cell acute lymphoblastic leukemia (T-ALL) is an aggressive cancer.
- CRLF2 overexpression is found in high-risk T-ALL but lacks clear molecular drivers.
- NOTCH1 and IKZF1 pathways are implicated in T-ALL pathogenesis.
Purpose of the Study:
- To investigate the association between IKZF1, CRLF2, and NOTCH1/FBXW7 mutations in pediatric T-ALL.
- To elucidate the molecular mechanisms underlying CRLF2 overexpression in T-ALL.
Main Methods:
- Analysis of pediatric T-ALL cohorts (PHOP and TARGET).
- Assessment of NOTCH1/FBXW7 mutations and CRLF2/IKZF1 gene expression.
- Correlation analysis between genetic alterations and gene expression.
Main Results:
- CRLF2 overexpression was observed in 14-16% of T-ALL cases.
- No direct correlation between CRLF2 and IKZF1 mRNA expression was found.
- Mutations in NOTCH1-PEST domain and/or FBXW7 were associated with higher CRLF2 expression.
Conclusions:
- NOTCH1 intracellular domain (ICN1) stabilization due to specific mutations correlates with CRLF2 overexpression in T-ALL.
- This finding provides a molecular link between NOTCH1 signaling and CRLF2 in T-ALL pathogenesis.
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