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To test our strategy in therapeutic conditions, we assessed
correction of globin imbalance in patients' HSPCs.As positive control, HSPCs were
transduced with a LV encoding for a bAS3 transgene under the
control of the b-globin gene promoter and its mini-locus control
region, currently in clinical trial for thalassemia (LV bAS3).13,
RNP transfection was very efficient both in erythroid liquid culture
and CFC in generating InDels (90.5% 6 7.1 for RNP and 90.4% 6
9.0 for RNP1AAV, mean 6 SD; Figure 5A), HBA2 deletion (0.95 6
0.06 HBA2 copies/cell for RNP and 0.77 6 0.15 for RNP1AAV,
mean 6 SD; Figure 5B) and bAS3 KI (0.80 6 0.21 copies/cell for
RNP1AAV, mean 6 SD; Figure 5C).Globin mRNA analysis of single BFU-E colonies derived from b0-
and b1-edited HSPCs showed that a/b imbalance was improved
in all conditions, in accordance with the reduced number of
HBA2 genes (supplemental Figure 4G) and with the stronger
effect resulting from the concomitant a downregulation and bAS3
expression (Figure 5F).mRNA globin imbalance (measured as a/b-like globins ratio) was
ameliorated in all conditions (Figure 5D), with bAS3 KI cells
performing better than HBA2-deleted erythroblasts because of
bAS3 expression (Figure 5E; supplemental Figure 4C).Of note,
modified HSPCs retained proper erythroid differentiation (supplemental
Figure 4D) and multilineage potential (CFC assay;
supplemental Figure 4F), although we observed some toxicity
associated with the editing procedure (supplemental Figure 4E).In particular,
we tested the HBA2 deletion approach in b1 cells and the
combination of the a-deletion and bAS3 KI strategy in b1- and b0
-thalassemic HSPCs (supplemental Figure 4A-B).HSPCs were transfected with RNP and transduced with AAV as
described previously (Figure 3A).Overall, these data show that we can modify b-thalassemia HSPCs
and reduce their a/b globin balance, without affecting HSPCs
potential.
To test our strategy in therapeutic conditions, we assessed
correction of globin imbalance in patients’ HSPCs. In particular,
we tested the HBA2 deletion approach in b1 cells and the
combination of the a-deletion and bAS3 KI strategy in b1- and b0
-thalassemic HSPCs (supplemental Figure 4A-B).
HSPCs were transfected with RNP and transduced with AAV as
described previously (Figure 3A). As positive control, HSPCs were
transduced with a LV encoding for a bAS3 transgene under the
control of the b-globin gene promoter and its mini-locus control
region, currently in clinical trial for thalassemia (LV bAS3).13,
RNP transfection was very efficient both in erythroid liquid culture
and CFC in generating InDels (90.5% 6 7.1 for RNP and 90.4% 6
9.0 for RNP1AAV, mean 6 SD; Figure 5A), HBA2 deletion (0.95 6
0.06 HBA2 copies/cell for RNP and 0.77 6 0.15 for RNP1AAV,
mean 6 SD; Figure 5B) and bAS3 KI (0.80 6 0.21 copies/cell for
RNP1AAV, mean 6 SD; Figure 5C).
Globin expression was monitored during erythroid differentiation.
mRNA globin imbalance (measured as a/b-like globins ratio) was
ameliorated in all conditions (Figure 5D), with bAS3 KI cells
performing better than HBA2-deleted erythroblasts because of
bAS3 expression (Figure 5E; supplemental Figure 4C). Of note,
modified HSPCs retained proper erythroid differentiation (supplemental
Figure 4D) and multilineage potential (CFC assay;
supplemental Figure 4F), although we observed some toxicity
associated with the editing procedure (supplemental Figure 4E).
Globin mRNA analysis of single BFU-E colonies derived from b0-
and b1-edited HSPCs showed that a/b imbalance was improved
in all conditions, in accordance with the reduced number of
HBA2 genes (supplemental Figure 4G) and with the stronger
effect resulting from the concomitant a downregulation and bAS3
expression (Figure 5F).
Overall, these data show that we can modify b-thalassemia HSPCs
and reduce their a/b globin balance, without affecting HSPCs
potential.
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