(B) qRT-PCR analysis using primers overlapping exons 15 and 16 permitted to quantify the non‐skipped α1S form: 18±6% (**P⩽0.001, n=19) and 10±7% (**P⩽0.001 n=19) (black bars) of the total α1S mRNA (grey bars) at 2 and 6 months post injection in TA of AAV1‐(U7‐ESE) and AAV1‐(U7‐SA):ΔDHPR or AAV1‐(U7‐Ctrl): c as a control, respectively. 