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An enhancer haplotype may influence BCL11A expression levels and the response to hydroxyurea in β-thalassemia patients.
Pharmacogenomics 2017 July
AIM: To identify the BCL11A intron-2 enhancer linkage disequilibrium (LD) block, harboring two previously identified SNPs, associating with the hydroxyurea response in β-thalassemia patients and the functional significance of this region.
MATERIALS & METHODS: Several neighboring SNPs were genotyped in our cohort. The associating LD block was identified, and its function studied in K562 erythroid cells via CRISPR/Cas9 genome editing.
RESULTS: A haplotype harboring three tag SNPs correlated significantly with the HU-response and BCL11A transcript levels in the patients' reticulocytes. Two deletions encompassing this LD block significantly reduced BCL11A transcript levels in K562 cells.
CONCLUSION: Our data suggest an essential role for this LD block in BCL11A expression levels and the response to hydroxyurea in β-thalassemia patients.
MATERIALS & METHODS: Several neighboring SNPs were genotyped in our cohort. The associating LD block was identified, and its function studied in K562 erythroid cells via CRISPR/Cas9 genome editing.
RESULTS: A haplotype harboring three tag SNPs correlated significantly with the HU-response and BCL11A transcript levels in the patients' reticulocytes. Two deletions encompassing this LD block significantly reduced BCL11A transcript levels in K562 cells.
CONCLUSION: Our data suggest an essential role for this LD block in BCL11A expression levels and the response to hydroxyurea in β-thalassemia patients.
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