A method for repairing HBA2
gene mutations by single base editing and use thereof, belonging to the technical field of
gene editing. The method comprises the following steps: contacting a single base editor and gRNA with an HBA
gene sequence to be edited and repaired, deaminating the codon target
cytosine base at CD142 in the HBA
gene sequence, and converting the
cytosine into
thymine. According to the method,
pathogenic mutation sites can be accurately edited without generating double-strand breaks and affecting
chromatin conformation and
genome stability, without generating random insertions of large-fragment genes into genomes, which have a low influence on
cancer gene activation or tumor-inhibiting gene inactivation, and without generating random insertions / deletions at other sites of a
genome. The expression of the repaired
target gene is regulated by all regulatory elements of natural HBA2; therefore, the method is very safe and can also better balance the expression of α / β
globin.