ATM alterations in childhood non-Hodgkin lymphoma

Area of Science:

• Oncology
• Genetics
• Molecular Biology

Background:

• ATM gene alterations and impaired ATM protein expression are implicated in adult lymphoproliferative malignancies.
• The role of ATM in lymphomagenesis suggests its potential involvement in pediatric lymphomas.

Purpose of the Study:

• To investigate the prevalence of ATM gene alterations and protein expression changes in childhood non-Hodgkin lymphoma (NHL).
• To determine the frequency and nature of ATM alterations in pediatric NHL cases.

Main Methods:

• Screening of 27 NHL cases for ATM mutations using denaturing high-performance liquid chromatography (DHPLC).
• Classification of gene alterations using direct/indirect criteria and in silico tools.
• Analysis of ATM promoter CpG island methylation status in 25 samples.
• Assessment of ATM protein expression via Western blot in 9 lymphomas.

Main Results:

• ATM alterations were detected in 44% (12/27) of childhood NHL cases.
• Ten different heterozygous base substitutions were identified in 10 NHLs (37%).
• Potentially pathogenic mutations or rare variants were found in 19% (5/27) of samples.
• Reduced or absent ATM protein expression was observed in 44% (4/9) of assessed lymphomas.
• No definitive genetic or epigenetic cause was identified for impaired ATM protein expression in most cases.

Conclusions:

• ATM gene and protein alterations are prevalent in childhood non-Hodgkin lymphoma.
• These findings suggest a significant role for the ATM pathway in the development of pediatric NHL.
• Further research is warranted to elucidate the mechanisms underlying ATM dysregulation in childhood NHL.