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Integration of Bioinformatics Approaches and Experimental Validations to Understand the Role of Notch Signaling in Ovarian Cancer
Published on: January 12, 2020
NOTCH1 mutations in CLL associated with trisomy 12.
Veronica Balatti1, Arianna Bottoni, Alexey Palamarchuk
1Department of Molecular Virology, Immunology and Medical Genetics, Comprehensive Cancer Center, The Ohio State University, Columbus, USA.
Blood
|November 17, 2011
Summary
NOTCH1 gene mutations are common in aggressive chronic lymphocytic leukemia (CLL) with trisomy 12, suggesting a critical role in this subtype of blood cancer.
Area of Science:
- Oncology
- Genetics
- Molecular Biology
Background:
- Recent studies identified frequent mutations in XPO1 and NOTCH1 genes in chronic lymphocytic leukemia (CLL).
- Previous reports indicated NOTCH1 mutations in 12.2% or 15.1% of CLL cases.
Purpose of the Study:
- To investigate the mutation frequencies of XPO1 and NOTCH1 in a cohort of 186 CLL patients.
- To explore the role of NOTCH1 mutations in specific CLL subtypes, particularly those with trisomy 12.
Main Methods:
- Whole-genome sequencing was performed on 186 CLL samples to analyze XPO1 and NOTCH1 mutations.
- Further sequencing of NOTCH1 was conducted in 77 additional trisomy 12 CLL cases, including IGVH unmutated/ZAP70(+) subtypes.
Main Results:
- XPO1 mutation frequency was confirmed, but NOTCH1 mutations were found in only 4% of IGVH unmutated/ZAP70(+) CLL and 1.5% overall.
- A significantly higher NOTCH1 mutation frequency of 41.9% was observed in aggressive trisomy 12 CLL cases.
- Four out of six NOTCH1-mutated samples also exhibited trisomy 12.
Conclusions:
- NOTCH1 mutations are not as frequent in general CLL as previously reported.
- NOTCH1 activation appears critical in the pathogenesis of aggressive trisomy 12 CLL, particularly in IGVH unmutated/ZAP70(+) cases.
- Trisomy 12 is associated with a higher prevalence of NOTCH1 mutations in CLL.
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