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Global gene expression as a function of germline genetic variation
Deborah French1, Mark R Wilkinson, Wenjian Yang
1Department of Pharmaceutical Sciences, St Jude Children's Research Hospital, Memphis, TN 38105-2794, USA.
Human Molecular Genetics
|April 29, 2005
Summary
Germline genetic variations in UGT1A1 and GSTM1 influence gene expression in childhood acute lymphoblastic leukemia (ALL). These genetic differences may impact ALL subtypes and patient outcomes.
Area of Science:
- Genetics
- Molecular Biology
- Pediatric Oncology
Background:
- Germline genetic polymorphisms are linked to cancer outcomes.
- The impact of germline variations on downstream gene expression in pediatric cancers is understudied.
Purpose of the Study:
- To investigate the association between germline genetic polymorphisms and global gene expression profiles in pediatric acute lymphoblastic leukemia (ALL).
- To identify specific polymorphisms that predict gene expression patterns in ALL blasts.
Main Methods:
- Genotyping of 16 functional polymorphisms in 126 children with newly diagnosed ALL.
- Analysis of global gene expression profiles in ALL blasts using microarray analysis.
- Supervised and unsupervised approaches to correlate germline genotypes with gene expression data, adjusting for ALL subtypes.
Main Results:
- UGT1A1 promoter repeat polymorphism (UGT1A1*28) and GSTM1 deletion significantly predicted global gene expression in ALL blasts.
- UGT1A1 genotype differentiated patient clusters in an unsupervised analysis.
- Specific genes like HDAC1, RELA, SLC2A1, NBS1, and PRKR showed differential expression based on UGT1A1 and GSTM1 genotypes.
Conclusions:
- Germline UGT1A1 and GSTM1 genotypes are associated with distinct global gene expression profiles in pediatric ALL.
- These findings suggest a potential mechanism by which germline variation influences cancer phenotypes.
- Further research is warranted to explore the clinical implications of these genotype-expression associations in ALL.