The use of an inhibitor of EXT1 expression and/or activity for the production of a biological entity in a cell. Also, the use of a cell having at least depleted EXT1 expression and/or activity for the production of a biological entity. Further, evidence is provided about the role of glycosylation in rapid dynamism of ER shaping and function. In particular, depletion of EXT1 results in a recomposed ER shaping, which could benefit production of recombinant proteins.

The disclosure relates to double stranded ribonucleic acid (dsRNAi) agents and compositions targeting a heparan sulfate biosynthesis pathway enzyme gene (HSBPE) gene, e.g., Exostosin Glycosyltransferase 1 (EXT1), Exostosin Glycosyltransferase 2 (EXT2), and/or N-Deacetylase And N-Sulfotransferase 2, (NDST2 gene), as well as methods of inhibiting expression of an HSBPE gene and methods of treating subjects having Mucopolysaccaridosis type III (MPS III), e.g., MPS IIIA, MPS IIIB, MPS IIIC, or MPS IIID, using such dsRNAi agents and compositions.

The present disclosure provides for a method of treating a Pten-loss induced cancer in a subject in need thereof, the method comprising administering an inhibitor of a CREB-heparan sulfate-FGF axis.